State Council called for air conditioning to take


 State Council called for air conditioning to take energy-saving measures  


 Wu marry music. Current Situation and Prospect of China's cold chain [J]. Refrigeration technology, (3) :18-21 [2] Peng Yunfeng, Wu Zhimin,hollister online shop, Gong Yang. New refrigerated containers thermal performance of experimental systems [J]. Shanghai University of Technology, 2000,22 (2) :180-184 thematic reports [3] Liu Xun sea, refrigerated containers thermal performance testing device developed by [J]. Shanghai University of Technology, 2000,22 (4) :356-359 [4] the Dushi Chun,hollister wijnegem, Wu Zhimin, Wang Fang. Refrigerated containers automatic performance test chamber developed [J]. Refrigeration and Air Conditioning, 2006, (1) :44-61 [5] ARIStandard1110-2001. StandardforMechanicalTransportRefrigerationUnits [6] AmericanBureauofShipping. RulesforCertificationofCargoContainer [7] Zheng Xiande. Refrigeration principle and equipment [M]. Beijing: Mechanical Industry Press,hollister milano, 2003,hollister roma,3 [8] Xue Dianhua. Air-conditioning [M]. Beijing: Tsinghua University Press, 2 (X) 5,8 [9] Wu industry is. Small refrigeration equipment design guidelines [M]. Beijing: Mechanical Industry Press,mulberry, 2006,2 the State Council require air conditioning to take energy-saving measures to conserve resources and protect the environment is China's basic national policy, to alleviate the situation of energy supply, protect the ecological environment and promote sustainable economic and social development,abercrombie düsseldorf, the State Council in 2008. August 1 issued a Strict implementation of the national mandatory standards for energy efficiency, not up to standard,hollister deutschland, banning the production and sales. Strict implementation of air conditioning energy efficiency labeling system, air conditioning product range to expand the implementation of energy efficiency labeling. Implementation of fiscal policy to encourage consumers to buy energy efficient air conditioning, and improve the market share of energy efficient air conditioning. Encourage the development of non-electric air conditioning. The second is to strengthen the air conditioning operation and management. Strict implementation of the standards of public buildings, air-conditioning temperature control. New public buildings use central air conditioning system, air-conditioning system should be to optimize the design, air-conditioning system should be carried out after the completion of energy efficiency evaluation. Establishment of air-conditioning system operation management system, optimize the air-conditioning operation mode. The third is to strengthen the transformation of the existing air conditioning systems and maintenance. Active use of variable frequency, variable air volume, adjustable flow systems,abercrombie düsseldorf, solar heating and cooling,hollister euroma2, ground source heat pumps, waste heat source heat pump. Efficient cooling towers and highly efficient heat exchangers and other energy-saving new technology,hollister frankfurt, new equipment, improve the efficiency of air conditioning running. Professional energy conservation service organizations to encourage and support the use of contract energy management,ralph lauren danmark, to implement energy-saving central air conditioning system. To strengthen the central air-conditioning systems maintenance, summer or winter, the air-conditioning, should be required to timely cleaning and maintenance. The same day, the State Council issued a notice on the depth of National Energy Action (Guo Ban Fa [2008] No. 106), the notice requirements are as follows: strict control of indoor air temperature on the energy saving of air conditioners and other matters. In addition to specific requirements and approved, public buildings, summer indoor air temperature is set no lower than 26 degrees Celsius, winter indoor air temperature settings shall not exceed 2o degrees Celsius. Advocated by residents in the light of the above standards set air conditioning temperature. Encourage and guide consumers to purchase air conditioners, refrigerators and other household appliances use energy-efficiency labeling more than two or energy-saving product certification mark. Administrative organs at all levels should give priority to buy energy-saving products, earnestly implement the relevant provisions of the compulsory procurement of energy-saving products. Advocate unit, the family every day during the summer peak period less open one hour air conditioning, open half an hour late lamps, ... timely closure of the closing devices and household appliances, to reduce the standby power consumption. - (Special correspondent Gen reports)  

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heat pump water heater Development Status and Perf


the

 heat pump water heater Development Status and Performance Test study  


 prayer 5003502006.05.04.00U3.02.01.0119p7 800,650 gift 53 -, ● r010203040 access to water temperature (° C) 9 out of the water temperature difference of power - ' ~' -1010203040 and out of water temperature (° C) Figure lO out of water temperature on COP 060 120 180 240 run time (min) Figure ll under different ambient temperature temperature difference changes with time in the actual running out of water temperature with the operation of the water heater is changed, while the environment temperature has also affected, as shown in Figure ll. Under the same ambient temperature, out of the water temperature gradually decreases; when the ambient temperature is high, access to water temperature,ralph lauren outlet, the maximum close to 10%,hollister, lower ambient temperature,hollister donauzentrum, the temperature difference decreases when the ambient temperature of 10 ° C, the maximum temperature difference of only 6 ° C or so. 4.3.4 The winter low temperature on the water heater heat pump water heater in the winter that it is functioning, whether it can meet the user needs is a key factor in the impact of September 2007 26 3 (100) refrigeration heat pump promotion, issues of concern to the water heater users. The effect of the description of heat pump water heater at low temperatures, especially ambient temperature for 5 ~ C and 20 ° C, the characteristic parameters are listed separately to show the comparison in Table 1 and Figure 12,hollister wien, 13. When the ambient temperature of 20 ° C, a water tank heated from 15 ~ C 55 ~ C, required three hours, while the ambient temperature of 5 ~ C, Shique seven hours, it is difficult to meet user needs, and greatly reduce the efficiency of the system was basically not energy,ralph lauren skjorter, indicating that the water heater is not suitable for the promotion of the region in the long cold season, in areas with shorter cold season is also in need of transformation to adapt to a lower ambient temperature, improve operational efficiency. Table 1 ambient temperature of 5 C and 20 C contrast when the ambient temperature of 5 ~ C,calvin klein, due to the low ambient temperature, humidity, evaporator frost phenomenon, the impact of heat exchange in severe 6.05 .04. efficiency when run with run-time changes 060120180240300360420 asked 083.02 .01 00.0120180240300360420 run (min) (rain) Figure 13 evaporating temperature with the change of the running time and the unit can not run, it is necessary to defrost. Comparison of evaporation temperature, as shown in Figure 13, the environmental of 5 ~~ C, evaporation temperature there is a reduction process, during that period, evaporator frost gradually defrost condition is reached, the unit reverse cycle automatic defrosting . And winter heating, heat pump units, defrost water temperature fluctuations will not give users a feeling of discomfort. 5 suggestions for improvement through the water heater to run theoretical analysis and experimental data analysis, put forward suggestions for improvement of heat pump water heaters. (1) unit automatic control and self-protection function. Heat pump hot water unit span a large range of different climate will have an impact on the unit. Therefore, the reliability of the electrical control system is essential for the unit, the embodiment of the automatic control system is also the value of the heat pump water heater. The most common protective measures: water temperature limit is set,mulberry, the exhaust temperature is too high to protect the exhaust pressure is too high to protect the compressor overload protection, suction pressure is too low to protect. (2) low-temperature environment, preparation of hot water measures. The cold season still the system out of high temperature hot water heat pump water heater in the north to promote an important factor. Low temperature environment,hollister carugate, preparation of high temperature hot water measures: (1) rely on auxiliary electric heating; ② high pressure ratio compressor and refrigerant; (3) the use of compressor exhaust sensible heat part of the system of high-temperature water, latent heat part of the system for low temperature water, divided into two parts heating; ④ The heat source can be attached to increase the evaporation pressure of the unit, such as the installation of auxiliary heating on the evaporator. (3) to optimize the running program. Set a different program of work according to the evaporation temperature, electricity policy and user characteristics,abercrombie düsseldorf, the user can choose the best program of work according to different needs and seasons change,hollister euroma2, the following proposed several operating modes: (1) lunchtime mode. Efficiency factor, the system only heating in the afternoon session, the remaining time to take insulation measures. ② Valley Electric mode. Based on economic considerations,hollister wijnegem, the system only in the valley electricity price difference period heating, and the remaining period to take the insulation measures. The ③ Valley Electric lunchtime mode. Adapted to the implementation of the difference areas of Valley Electric and large users of hot water dosage. ④ normal mode and instant heating mode. Based on comfort and controllability to consider the user-set heating start and stop time, or as needed to implement the temporary heating. 6 References [1] Han Min. Heat pump water heater prospects [J]. 00v electrical, 2OO6, (10) :63-630 £ 16 Figure the gift firewood  

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decompression keeping storage device

decompression keeping storage device

 an ultra-low limit temperature compensation system  


 O Introduction usual decompression fresh device in the refrigeration system to the storage room temperature adjustment are detected through the temperature sensor to control. When the set temperature is reached,mulberry, the cooling system to stop working, but there are still a part of the refrigerant in the storage room inside the heat exchanger pipes, heat exchanger in the cooling system to stop work still in progress, thereby enabling the storage room inside the low temperature segment is lower than the set point, is not conducive to the storage of fresh products, and even some frozen cherries, cut flowers and other temperature-sensitive plants. Therefore need to compensate for the extra cold storage indoors,hollister wien, to avoid breaching the lower limit temperature point phenomenon. Decompression preservation storage device patent (No. ZL200620109794.6) on the basis of its temperature control do improve the program. Soft cable heating elements, simple structure,hollister, simple control, the cost is very low. One of the purposes of a temperature compensation principle of our study is to provide the decompression fresh device an ultra-low limit of the temperature compensation system, this system can compensate for the low-temperature point of the decompression preservation device stockroom, to avoid refrigerant in the fluid within the heat exchanger temperature is lower than the temperature set point within the space. The technical solution adopted to solve the problem of decompression refrigeration units too cold: to avoid the hole laying a soft rope heating element in the bearing bracket,hollister online shop, and then set on aluminum. Set aside holes, bolted,abercrombie düsseldorf, so that close contact between the bearing bracket, soft rope heating element,hollister belgie, aluminum as a whole. The temperature sensor is installed in the inner wall of the storeroom. Finally, soft cable heating elements,abercrombie online shop, temperature sensor through the storeroom wall jack and its outside temperature compensation controller for the electrical connection. Load-bearing bracket for high,ralph lauren danmark, middle and both ends of the low, 5% slope, in order to facilitate the condensation of water emissions. The system is running to determine the storage room temperature reaches the set temperature of the cooling system of the storage room to stop working, start a soft rope heating element to compensate for the storage memory left of indoor heat exchanger refrigerant temperature sensor the cold. Temperature compensation controller to control the heat flux, in order to achieve the purpose of control of the storage room temperature in the lower limit temperature control. The main advantage of this technology is installed directly in the cooling system heat exchanger device can effectively control the low temperature range, to improve the Fund: Chongqing Municipal Education Commission of Science and Technology Research Project (KJ071409) Author: Ng Pei (1969 a), male, dual BA / MA, associate professor, mainly engaged in the built environment and equipment engineering teaching and research. Submission Date :2009.04-02 23 6 Wu Pei,abercrombie münchen, et al: decompression preservation storage device, an ultra-low limit temperature compensation system 13 device temperature control precision, simple structure, easy to implement. A. Aluminum; 2. Soft cable heating elements; Load-bearing bracket; Temperature compensation controller; Temperature sensor; Holes for bit; Jack; 8. Temperature compensation control knob: 9. Stockroom; a temperature compensation system structure of Figure 2 soft rope heating element horizontal coiled Figure 3 soft cable heating elements vertical coiled Figure 2 a super ultra-low limit temperature compensation mode of carrying out decompression of cold storage Storage devices The lower limit of the temperature compensation system (see Figure 1, Figure 2), aluminum, soft cable heating elements 2, the bearing bracket 3, the temperature compensation controller and temperature sensor composed of. Bolt through the reserve Kong 6 aluminum, soft cable heating elements 2, the bearing bracket 3 from top to bottom are connected together, so that close contact between the upper and lower, to ensure that the aluminum one and soft cable heating elements 2 good heat transfer performance. The temperature sensor is installed in nine inner wall of the storeroom. The temperature sensor 5 and a soft cable heating elements 2 through 7 of the the stockroom 9 wall jack electrical connection to the electrical interface to the temperature compensation controller. Temperature compensation controller on the compensation of the temperature control knob for adjusting the compensation heat. Soft rope heating element coiled There are two (see Figure 2, Figure 3). The, stockroom residual cold, combined with Figure 1, adjust the temperature compensation control knob 8 to select the compensation amount, the system is running, when the temperature sensor reaches the storage device set value, the cooling system to stop, start soft cable heating elements 2, the compensation of the cold. When the cold compensation is completed,hollister hamburg, the soft cable heating elements stop heating. Three ultra-low limit of the temperature compensation effect has been tested and when such a low limit temperature compensation system for decompression refrigeration device, as long as the temperature sensitivity of the sensor can be assured, this ultra-low limit temperature compensation device can be the temperature of the storage tank stability in (10) ° C,mulberry outlet, the range does not exceed ± 0.5 ° C: (1 ~ 10) ℃ within the continuous controlled.  

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The Powder technical and equipment play an importa


 The Powder technical and equipment play an important role in solid waste disposal and comprehensive utilization during  


 will form the new areas of the comprehensive utilization of equipment, and rapid development; speed of toxic and hazardous waste disposal equipment are gradually accelerated. It should be noted that China's solid waste comprehensive utilization of the large gap between developed countries. In particular, the lack of large complete sets of equipment in the comprehensive utilization of solid waste. ; Recycling of waste plastics sorting, crushing, washing, drying equipment and the regeneration of waste plastics using complete sets of equipment; steel waste residue comprehensive utilization of large-scale crusher, baler, large iron and steel recycling equipment; in pulverized coal Friends of comprehensive utilization, lack of collection, transportation, storage, transportation, sorting equipment. China will focus on the development of the following industrial solid waste disposal and comprehensive utilization of technology and equipment can be seen from the information. ● focus on the development of coal gangue power generation equipment: chemical industry,hollister neuss, metallurgy,mulberry outlet, nonferrous metal is burning gangue circulating fluidized bed, and complete power generation technology and equipment; construction of a number of coal gangue comprehensive utilization project in a coal mine; ● developing the use of industrial waste residue building materials technology and equipment: If the production of high strength,abercrombie hamburg, high porosity of the high residue addition capacity, high thermal insulation properties of sintered coal gangue hollow brick and fly ash sintering hollow bricks, fly ash aerated concrete, autoclaved fly ash brick and other,ralph lauren, utilizing waste products, equipment; hard plastic, semi-hard plastic molding brick-making technology and equipment; full gangue technology and equipment of the production of hollow bricks; gangue replace some or all of the clay production technology and equipment of the cement raw material. ● the development of the fly ash separation technology and equipment: in particular, a large amount of high value-added pulverized coal application technology and equipment; increase the fly ash for high-grade highways, hydroelectric dams,calvin klein, commercial concrete in the proportion of technology; research and development The fly ash used in railway construction technology; toxic and hazardous waste handling equipment: special focus on the development of toxic, hazardous waste-dense storage and processing equipment; high-temperature oxidation incineration technology and equipment. The latest advances and comments on [J]. Concrete, 2003, (10) :17-21. [6] Qu Zhi. The destruction of reinforced concrete and its use of new technology trends [J]. Building Technology,ralph lauren skjorter, 2001,32 (2) :102-104. [7] Fan Xiaoping,ralph lauren danmark, Xu Yinfang. Development and utilization of recycled aggregate concrete [J]. Construction technology development, 2003,30 (10) :46-47. [8] Du Ting, Huiqiang, Zhou Yufeng. Basic properties of recycled aggregate concrete thinking [J]. Construction technology development, 2002,29 (6) :37-39. [9] Xu Hao. Waste concrete recycling a few problems [J]. Building Technology, 2001,32 (2): lO6 l0. [L0] JoseMV Gomez-SoberoN. Porosityofrecycledconcretewithsubstitutionofrecycledconcreteaggregate. Anexperimentalstudy [J]. CementandConcreteResearch2002, 32:1301 a l3l1. [L1] RoumianaZaharieva FrancoisBuyle-Bodin,abercrombie düsseldorf, FredericSkoczylas,, eta1. Assessmentofthesur-facepermeationpropertiesofrecycledaggregateconcrete [J]. Cement & ConcreteComposites ,2003,25:223-232. [L2] Chen Hongbo, XIAO Zhuang. High-performance concrete, recycled aggregate [J]. Residential Technology, 2003 (3) :33-35. [L3] Kong Deyu Fang Cheng Tu and his roots. High Performance of Recycled Aggregate Concrete [J]. Industrial buildings,hollister wien, 2003,33 (10): 5O a 53 [l4] Bing,hollister, Lu TY. High-strength concrete of recycled aggregate [J]. Building gypsum with the gel material, 2003, (10): l5 a l7. [L5] Guo Taiping,abercrombie madrid, Huiqiang. Applications of recycled aggregate technical and economic analysis [J]. Science and Technology of Overseas Building Materials, 2003, (6) :64-65. [L6] Wan Hui-Wen, water, and Lin Zongshou and so on. Environmental Assessment of the recycled concrete [J]. Wuhan University of Technology, 2003,25 (4): l7-21. [L7] Tao Zhendong Zhang Ying, Yang Zhongxi. Activation of high energy ball milling of hardened cement paste [J]. Cement Works, 2004, (4): 2l a 24  

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energy-saving central air-conditioning Design Comp


 energy-saving central air-conditioning Design Competition announced / pre> 


 ,hollister wijnegem, jointly organized by the Guangzhou stellar group of energy-saving central air-conditioning design Contest ~ The contest was warmly welcomed by the province Refrigeration HVAC designers and active participation . After screening , a total of 22 air source heat pump hot water unit ,ralph lauren outlet, heat recovery units,hollister euroma2, central air-conditioning energy-saving design and other projects designed to run . Expert Group on December 7 , an official selection , grouping on the first entries were reviewed and the primaries , then the primary short-listed projects were joint hearing . After careful discussion in accordance with the principles of fairness, impartiality ,hollister dortmund, the group selected two projects of the second prize and third prize project 6 ( first prize project vacancies) . The winners are as follows: December 26 ,mulberry, Design Competition Prize Presentation Ceremony was held in the Asia Hotel in Guangzhou . Guangdong TV ,calzoncillos calvin klein, Guangzhou TV ,abercrombie hamburg, cruise Travel Channel Information Times . Asia-Pacific Economic Times ,hollister köln, and many other media site covering this central energy-saving air-conditioning design contest activities will be held on the penetration . The Cheke school development concept, vigorously promote energy saving ,ralph lauren, active industry,abercrombie münchen, academic atmosphere ,abercrombie and fitch hamburg, and promote the industry, technological progress and sustainable development are of great significance .  

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the resistance

the resistance

 cucumber dropout pre-cooling process features experimental study  


 RETmnsacfious, V0lI90 (1990) :406-417 [2jK. V. Chau J. J. Gaffney, C. D. Baird, G. A. Church. ResistancetoairflowoforangesinbulkandincaaousEJ], AmericansocietyofA puzzle tura1Eng. meers, 1985, V01.28 (6) :2083-2O88 [3] Liu Fengzhen, Wang Qiang. Strawberry differential pressure ventilation in the pre-cooling process, impact parameters [J]. Journal of Refrigeration, 2001, (4) :49-53 [4] Wang Qiang, Liu Fengzhen, and even add up. Grape pressure pre - cooling experiment [J]. Food Science, 2001,22 (10) :88-90l5JIbrahimDincer. The Wanhua flowprecoolingofindividualgrapes. J0t Bu maloffoodengineeringVo1.26 (1995) :243-249l6] B. SadashiveGowda, G. S. V. L. Narasimh. M. V. KrishnaMurthy. Forced-airpreeoolingofsphericalfoodsinbulk [J]. Aparametricstudy. Korea Park, Heatand jingling lJidFlow ,1997,18:613-624 [7], Hu Hong, Zheng Shufang,hollister milano, Li Wu. Vegetable harvesting,abercrombie hamburg, grading,calvin klein, packing, poor Asian pre-cooling procedures [J]. Vegetables ,2002,7-2O02, 12 [8] M. C. N. Nunes,abercrombie hamburg, J. K. Brecht ', A. M. M. B. Morais,abercrombie hamburg, S. A. nt. Physicalandchemicalqualitycharacteristicsofstrawberriesafterstoragearereducedbyashortdelaytocooli ~ [J]. PostharvestBiologyandTechnology,ralph lauren, 1995, Vo1.6 :17-28 (1) Guo Yali. Theoretical and experimental study of pre-cooling of tomato differential pressure [J]. Journal of Tianjin University of Commerce, 2O00 (2) Wang Qiang. Theoretical and experimental study [D] the grapes Differential Pressure Precool airflow and temperature distribution. Journal of Tianjin University of Commerce,abercrombie düsseldorf, 2O00 - quality, safety - Sichuan Trade and Industry Bureau and sampling 80% market frozen dumplings failed Sichuan Administration for Industry and carried out spot checks on the market of frozen dumplings at the end of 2004,hollister deutschland, a total of sample 2o batches of frozen dumplings; qualified four batches, the pass rate was only 2o%; 16 batches failed, the failure rate as high as 8o%. The main problems are: total bacterial count, mold count of seriously overweight, poor hygiene conditions. The intrinsic quality of unqualified seven batches, such as nominal Chengdu Swiss Dole Food Company production of City catering company depends on rice balls Food Factory two batches of ravioli (vegetables, meat) Quality of the cold test of air-conditioning last winter and spring, several snow changed over the years one after another, according to the statistics of the Shanghai Municipal Consumer Protection Association, the New Year period,abercrombie münchen, received a total of consumer complaints of all kinds of goods 26O pieces, four complaints,calzoncillos calvin klein, Report 18,hollister donauzentrum, in which the air conditioning categories of complaints 45 of the total volume of complaints 17.3%, ranking the first of the complaint. Complaints from air-conditioning products up to consumers to reflect the brand-name air-conditioning heating or heat is not enough, many of them, some air conditioning supply and marketing to repair six or seven times, the result is still not heating, the last Dealers said: even the user this brand of air conditioning and heating is, you make do make do - (Special correspondent Gen reports)  

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central air-conditioning systems inverter technolo


 central air-conditioning systems inverter technology the Discussion  


 type; (3) change the temperature of the chilled and cooling water systems, the loop will appear in PII9 deviation of the constant correction, so that the inverter to continue to be adjusted according to the PI regulator or built-in PID operation (acceleration or deceleration ), the pumps work in the best working condition; (4) When the system interference signal, the PID regulator to respond quickly (see Figure 3). 5 characteristics of the modulus of closed-loop control of the central air conditioning pump energy-saving systems in recent years, with the continuous development of fuzzy control theory, the control algorithm also continue to be applied to practice. It is not only able to achieve control, and can simulate the human way of thinking, effective control can not construct the mathematical model of the controlled object; fuzzy intelligent control will not overshoot phenomenon (see Figure 4),hollister wien, so the saving rate will be increased; system interference signals can quickly respond to external disturbances,hollister neuss, a strong anti-jamming capability of fuzzy systems; central air-conditioning pump frequency operation using fuzzy digital control,hollister köln, the intelligence to further improve the system anti- interference will be strengthened, energy-saving effect will be increased. With the continuous development of microcomputer technology, fuzzy control will be applied in wider areas. System hardware design block diagram shown in Figure 5. ,hollister frankfurt,, . Two :: ~ / _ /  ,. The overshoot disturbance white {I respond to ll {Figure ID adjustment f /, Overshoot response: Gansu action /}} / Figure 4 Fuzzy Intelligent Control system hardware design block diagram of the 6 application examples in a hotel in central air conditioning system a total of two sets of Carrier 165kW (225 tons), host one with a prepared way to run an average annual run over 7000 hours, the building office buildings and hotels. An annual average of more than 7000 hours of running time, in addition to the hotel No.. 4,2006, Dec. The vo1.25 the (TotalNo.97) portion must be a daily 24-hour run,mulberry outlet, the office part of just during the day time for air-conditioning, daily cooling time is less than 1O hours,ralph lauren sverige, night, office do not use air conditioning when the heat load is smaller, water pumps still high load to the motor constant speed operation,hollister roma, resulting in pressure bypass valve action, short-circuit part of the flow,hollister online shop, resulting in a large waste of energy. 6.1 specific transformation method (1) chilled water system: to ensure that refrigeration units for chilled water flow under the premise, the minimum operating frequency determine the work of a frozen pump inverter can be set to lower frequency. The pump motor frequency modulation Figure 6 chilled water control system in Figure 7 cooling water control system failure frequency conversion power frequency fault frequency power frequency section is installed in the system pipe temperature sensor measured backwater temperature. Thermostat settings for comparison. Frozen return water temperature is greater than the set value, the maximum frequency of the inverter output, the pump motor, high-speed operation; when Frozen return water temperature is less than the set temperature the motor to set the frequency curve. The system shown in Figure 6. (2) cooling water systems: cooling water system to the differential pressure signal as the feedback signal, the constant pressure differential control system shown in Figure 7. 6.2 transformation function (1) variable frequency / power frequency switching function: If the conversion of a switch to (2) closed-loop automatic run function: change-over switch placed in the (3) open-loop adjustment: change-over switch placed in the From the operation, the frequency converter has the following characteristics: 1) energy saving effect is significant; 2) to achieve a soft start, motor starting current dropped significantly, to avoid the impact of motor starting on the grid; 3) equipment run more smoothly, eliminating start and stop the water hammer effect; 4) closed-loop automatic control,hollister carugate, increased levels of automation,hollister deutschland, safe and reliable, unattended. 7 Conclusion inverter technology used in central air conditioning is a very mature application of technology, investment, energy-saving effect is very good, with significant economic benefits, and can improve the control system, improve system quality factor, control overshoot and enhance the system anti-jamming capability, is a worthy application of technology. 8 References [1] Wei Hongyi. Refrigeration and air conditioning equipment, electrical control [M]. Guangzhou: Guangdong Science and Technology Press,abercrombie düsseldorf, 1998 [2] Li Xianguang. Abroad ammonia refrigeration system, the new security settings [J]. Refrigeration, 72D5, 24 (4) :47-49 [3] Liu Qingjiang. Cold storage air cooler melt the frost energy conservation [J]. Refrigeration, 2005,24 (4) :12-15  

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Canada deep lake to replace the refrigeration equi

The

 Canada deep lake to replace the refrigeration equipment  


 will damage the ozone layer, and therefore is an ideal substitute for R502 refrigerant. Technically, the R404A refrigerant in practical applications, the impact of the structure of its refrigeration system, and its actual energy consumption, how, how to reduce the market price and other issues remain to be further testing and discussion. Purely on R404A this refrigerant, its application to domestic commercial refrigeration equipment is not common, but it has broad application prospects, which are to be driven by time, technology and policy. [1] Huan Jie. Freezer refrigerant 1t22 alternative [J]. Refrigeration technology, 1998,abercrombie españa, (3) :1-3 [2] Wengwen Bing,calvin klein, Jiang can photos. Substitute for R502 azeotropic mixed refrigerant R404A [J]. CFCs dynamic,abercrombie düsseldorf, 35 -38 [3]} V dry spring. The use of R404A in the freezer of my company [J]. Temperature and Specialty Gases,hollister roma, 2001,19 (5) :35-36 [4] C. Aprea,hollister donauzentrum, R. Mstndlo, F. deRossi. BehaviourandPerfor-rllallCesofR502AlternativeWorkingnuidsinRefrigeratingPlants. InternationalJournalofRefrigeration +1996,mulberry,19 (4) :257-263 [5] Jiang able Wengwen Bing, Wan Li-bo, et al. France Taikang air-cooled condensing unit R404A substitution for R502 Applied Research, 1996, (3) :58-63 [6] Zheng after the construction. On the Chinese supermarket ten [J]. Hunan University of Commerce, 2OO4. ll (6) :18-21 - new foreign product information] - Japan's research and development of air-conditioned clothes air-conditioned clothes with changes in body temperature to adjust the temperature of this air-conditioned clothing of clothes most suitable for the the thermoregulation weak elderly and patients unresponsive to temperature change. Canada deep lake to replace the refrigeration equipment in Toronto, Canada EnwavcEnergyCorp The company launched a plant for disposal,abercrombie madrid, was transported to an energy conversion station through underground pipes, air-conditioned transportation to the office building. Toronto,mulberry, l4 Building Building the deep lake water cooling system, this system is replaced by energy saving and low-cost traditional Freon refrigerant electric air conditioning equipment by the Vice Mayor of the City of Toronto on July 24,abercrombie hamburg, 2OO6 years personally opened the valve of the deep lake water cooling system of the City Council Building. only this building every summer to reduce power consumption 1.5MW, which is equivalent to the annual electricity consumption of 174 local residential applications of this system is only the cold of the lake,abercrombie münchen, the lake water quality the unaffected pollution,abercrombie hamburg, after the cooling lake can still be produced for drinking. - - (special correspondent Gen reports)  

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transformation and analysis

The

 transformation and analysis , ice pool evaporator 


, return air, mixed with small droplets not evaporated will cause the compressor to produce the phenomenon of liquid hit. Therefore, the liquid supply port and back to the air intake layout, allows liquid flow from A to B, and C in this way,ralph lauren sverige, the internal pressure throughout the entire evaporator is basically in equilibrium, each pipe back to the gas statement back to the gas gathering Lord transformation in Figure 2, the structure of the inner wall of the evaporator can refrigerant full contact with the liquid to get the full evaporation. After evaporation of gas oil through the back bend at D, the gas back to the compressor lubricating oil gathered here in order to avoid the occurrence of the above issues. Should be noted that some of the details (1) to determine the oil return rate and pressure loss in the suction pipe. Since the original compressor with oil separator, exhaust oil separator,hollister frankfurt, a large number of lubricants separated from the exhaust, bringing together the oil separator, and then returned to the crankcase for various parts of the compressor lubrication with only a small some lubricants with R12 refrigerant into the evaporator, in a certain period of time, the amount of lubricating oil in the crankshaft in the box to meet the normal operation of the compressor. With the growth of machine running time, into the lubricant within the evaporator is also more and more, the crankshaft box lubricants can not meet the normal operation of the compressor, so over time to add some oil. Evaporator long this has been, will be gathered a lot of oil, which is also an important factor to affect the cooling effect. The new put on the compressor and condenser unit without oil separator, lubricant with the refrigerant into the evaporator must rely on gas brought back, so the system can return to oil,hollister hamburg, this transformation off in March 2005 2, 4, 1 (90) refrigeration. Riser longer transformation evaporator back to the trachea trail, the pipe must be to ensure that the speed of the oil return, the new compressor back to the trachea inner diameter of 54mm, the system evaporation temperature of 20 ° C, check R22 rising oil minimum suction tube back flow rate diagram can have the minimum required to return to the oil speeds of 7.8m / s. R22 refrigerant evaporation temperature for a 20 ° C, the total pressure within the suction pipe loss of license values ​​should not exceed 9kPa, the pressure loss of license value is equivalent to the saturation temperature decreases 1oC, if the pressure loss is too large, the will lead to the specific volume of the suction, compression ratio increases, the cooling capacity per unit volume reduction in coefficient of performance decline,mulberry, so the pressure loss must be controlled within a certain allowed values ​​in order to better play the energy of the compressor. Known compressor cooling capacity of 52.3kW, the suction line equivalent length 9m suction tube inside diameter 54mm, R22 inhale pipe calculation the picture to check back to the gas flow rate of 19m / s pressure loss 8kPa, and meet the minimum oil return speed and total pressure loss in license value, the system can return to normal oil. (2) back to the oil curved curved radius. Oil return bend bend radius as small as possible,hollister online shop, if the oil return bend, bend radius is too large, the gas pressure before and after the oil return bend will be subject to greater resistance, can lead to the oil seal is too large,abercrombie hamburg, making the compressor an excessive reduction of the inspiratory pressure, therefore,ralph lauren, to choose two of DN50, the R = 1.0DN seamless elbow butt welding into a (3) within the system must ensure that dry. For this system, the brine temperature requirements for the 15 ~ C, take 5 ~ C, the temperature difference between the evaporation temperature of the brine temperature,hollister milano, evaporation temperature 20 ~ C, in this case, the maximum solubility of water 300 (nag water the / kgR22) Liquid water content is greater than this value will make the thermal expansion valve to the phenomenon of ice block, thus affecting the cooling effect. In addition, when Freon mixed with water, the increase over time,abercrombie düsseldorf, will slowly hydrolyze, to produce acids, hydrogen chloride and hydrogen fluoride, a corrosive effect on metal, for R22 per kg of liquid water content is limited in the 25mg within. Therefore,abercrombie madrid, the evaporator must be carried out after washing, drying,calvin klein, and the installation of machinery, equipment, time to choose a clear day, to ensure drying within the system. (4) must be carried out due to the evaporator is a long soak in the c ~ cl2 salt water pool, the outer surface of the anti-corrosion treatment, two layers of anti-rust paint brush on the outer surface of the evaporator. (5) placed in the evaporator, under the premise of ensuring the overall equipment placed flat, should make the oil return bend end of the foot is slightly lower than the other three support legs, making the lubricant to facilitate bending the side of the oil return flow. After transformation, the evaporator into production since the cooling effect is greatly increased, and the effect of the oil return good description of rehabilitation programs is feasible. References [1] Xu Shiqiong. Refrigeration technology Q & A [M]. Beijing: Science Press, 1987 [2] Wu Ye, Han Baoqi. Refrigeration principles and equipment [M]. Xi'an: Xi'an Jiaotong University Press, 1995  

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臭氧在食品加工、冷藏库中的应用

臭氧在食品加工、冷藏库中的应用

空气的1.72倍,为了扩散均匀,臭氧气体投加位置应在使用房问偏上部,或自下向上吹。在储藏保鲜应用时,应注意使臭氧能容易接触储藏物表面并使各处浓度均匀。应用臭氧的环境湿度应调整到RH60%以上,湿度低于RH45%时臭氧对空气中微生物几乎没有杀菌作用…1。湿度越高杀菌效果越好。臭氧使用应与人隔绝,正常杀菌消毒应与工作时间错开(其它消毒方法亦如此)。保证工作环境臭氧低于安全浓度0.1(10),calzoncillos calvin klein。一般在湿度较大的情况下,浓度为2(10)的臭氧,hollister online shop,2h后即消耗、分解完毕l。操作人员检测时短时间接触臭氧不构成危害。3.2臭氧发生器的选用臭氧由于易分解不能像氧气那样生产后储存在钢瓶内备用,只能边产生边使用。产生臭氧的设备即为臭氧发生器,目前应用的发生器多是利用交变高压电场产生电晕放电使空气的部分氧气分解、聚2005年6月第24卷第2期(总91期)制冷合为臭氧的。一般空气、物品杀菌消毒选用“开式”发生器,它结构简单,使用方便。产生臭氧浓度较低,不需再扩散稀释。由于臭氧比空气重,开式发生器臭氧出口应选在高处,使臭氧自上而下扩散,浓度比较均匀。一个车间装多台发生器时,应注意布置,使臭氧浓度均匀,hollister deutschland,同时离门远一点。根据多年的实践经验,franklin and marshall sale,间断使用臭氧,食品加工车间按500m3空间选用一台3g/h产量臭氧发生器;冷库消毒要求浓度高,abercrombie düsseldorf,可集中多台发生器连续开机48小时以上,calvin klein。食品加工用水均可按lm水投加2.0~2.5g臭氧设计,按每小时处理水量选择发生器规格即可2l。3.3臭氧气体用于冷藏库/j~-r-车间的参数见表1表1空气中使用臭氧的参考浓度(10)注:0.3(10一)=2.14mg/m34臭氧的安全性臭氧作为杀菌消毒剂当然不能对人直接使用,隔绝人使用是一项原则。多年理论研究与实践证明,臭氧对人的影响在消毒剂中是比较小的。我国卫生部制定的《工厂卫生标准》中规定臭氧安全标准0.15(10),franklin & marshall,美国和国际臭氧协会的标准是0.1(10)下工作8~10小时。在这些浓度下任何人都会感觉到臭氧的特异性臭味,有人会有轻微口干的感觉。这些刺激当离开臭氧区回到自然环境下,即很快消失不留症状。车间消毒安排在上班前下班后,贮藏库开机时间与查库、出货时间错开,人们即使嗅到点臭氧,由于时间很短也没有任何损害。4.1对食品的影响臭氧杀菌10(ppm)级,作用于食品表面只产生极微弱的氧化作用,不足以影响食品内在物质变化。由于臭氧仍易分解,空气中半衰期2050分钟,在食品表而也不产生残留。4.2对食品与冷库/jnr设备的影响虽然臭氧是强氧化剂,但由于在窄气中应用浓度与对表面氧化要求相比还是很低的,不足以造成明显损害。实践证明,应用多年的加工车间、冷库,均未发现设备、装置明显受损的情况,橡胶制品除外。由于水处理应用臭氧浓度高,接触臭氧部分的材料应具有防氧化能力。总之,臭氧气体由于其强氧化作用而成为新的优良消毒剂与杀菌剂,在食品加工车间、冷库消毒,除臭净化与食品加工设备消毒,食品表面杀菌、防霉保鲜等有优势,abercrombie hamburg,因而获得日趋广泛的应用与推广,abercrombie hamburg。5参考文献[1]张志国.应用在食品工业中的臭氧消毒灭菌技术[J].食品科技,2000,(3):57—58[2]于平.臭氧在食品保鲜和加工中的应用[J].食品研究与开发,2001,22(6):70—73[3]邓曼适.臭氧消毒技术原理及其应用前景分析[J].华南建设学院西院学报,abercrombie hamburg,2000,8(3):54—58[4]翁佩芳,hollister köln,吴祖芳,陈济东.臭氧的发生及其应用研究[J].食品与机械,2001,6:19—23[5]方敏.臭氧及其在水产品保鲜中的应用[J].水产科学.2003,22(4):35~37

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