Sunday, March 27, 2011

【 Weak current College 】 freezer energy introduction 】


Cold energy dissipation factor mainly include the performance of the refrigeration system, refrigerant selection, compressor, condenser and evaporator selection, cold storage size and layout, a cold-insulation layer type and thickness, cold storage and cargo, freezer door of heat insulation, etc. to improve refrigeration efficiency all factors should be taken into consideration. Energy-saving way to reduce the energy consumption of refrigeration storage is usually divided into two parts: 1) to reduce cold room cooling load, (2) cold storage equipment selection. An energy-saving, freezers fruits and mini refrigerator is comprised of the Library Board cold storage, refrigeration units, evaporator, etc. in good advance manufacturing factory, in the field of origin of agricultural products to be assembled after installation of cold storage or civil cold store or freezer half-half Assembly, civil engineering and reservoir capacity is generally less than 200m3 for fresh cold storage. Classification by design temperature, fruit thinning mini freezer temperature freezer belonging to. Mini Freezer by the refrigeration system, the Treasury, control systems, etc. Effect of freezers and cold energy-saving measures 1. cold storage building envelope refrigerator running through the envelope's chilling and cold storage building envelope unit proportional to heat flow. Therefore, it should be more in reducing cold storage of cold storage building envelope unit heat flow indicators. To reduce the heat flow rate envelope unit, a thermal conductivity of the insulating material, the second is to thick envelope layer. But in General should not be too thick thickness, otherwise the increase in construction costs and waste of space. Therefore, to the appropriate thickness range select insulation. Typically require insulation thermal conductivity of small, low water absorption, high cost of low-temperature performance is good, can not be too high. Common cold insulation materials have rice husk, polystyrene foam, polyethylene-cool rigid foam, etc. Rice husk using convenient, but the smaller thermal resistance, moisture absorption, and the dosage, the library of construction involved a time-consuming conversion actually cost less polystyrene; polystyrene foam manufacturers, acquisition, thermal resistance is large, affordable, easy to install; a polyurethane rigid foam thermal insulation performance of the biggest, best, but the price is high. 2. cold storage building envelope of moisture and cold storage building envelope geqi to take moisture geqi measures are also necessary, this will make the insulation of heat preservation performance variation. This is a cold storage warehouse in just starting using thermal insulation properties and good, but with time and poor insulation. Due to the high temperature steam from the low-side, side, moisture-proof geqi layer should be set at a high temperature insulation. 3. cold evaporation pressure and temperature evaporation temperature and evaporation pressure corresponds to know after evaporation pressure can be obtained by consulting evaporation temperature. Temperature in cold storage warehouse under certain conditions, the temperature difference (evaporation temperature and the temperature differential of the coffers) reducing evaporation temperature can increase proportionally, freezer refrigerator cooling capacity will be increased, improved cycle efficiency, the saving energy. 4. freezer defrosting operation in General, when the evaporator surface of frost layer on the air resistance is not significantly, through the evaporator air flow rate is not reduced, the effects of frost layer is not serious, not defrosting; when the air flow is significantly reduced, should conduct a defrosting. Air humidity increases, evaporator temperature and the temperature of cold storage library, easier on the evaporator, the combination of frost and freshness, to adopt the package of frozen fruits and vegetables can reduce energy consumption, reduce dry evaporator defrosting times, actually also played the role of cold storage and energy saving. 5. cold storage temperature and cold storage warehouse utilization of different fruit and vegetable storage temperature is different, each kind of fruits and vegetables are also suitable for the storage temperature range. Without prejudice to the fruit and vegetable quality, energy-saving refrigerator should use a higher storage temperature. High temperature of cold storage library, and evaporation temperature refrigeration system also increases, refrigerator cooling capacity will increase, the course also cycle efficiency has improved. Improving cold storage library temperature more importantly can also reduce the body through the library of heat to the outside. Energy-saving refrigerator warehouse utilization is real fruits and vegetables account for volume and effective volume ratio of the Treasury. For micro-cold storage capacity utilization generally 0.3, certainly would not be too high, otherwise a cooling problems. For the storage of fruits and vegetables of volume change is large, it should be split into two or more freezer cold storage rooms. In addition to selecting the right storage cycle, the energy of the freezer is self-evident. 2. frequency technology for refrigerated cold storage and energy-saving light cold storage consumption of 80% of enterprises is the refrigeration system, and refrigeration compressor power consumption accounted for 60%, therefore the compressor by matching motor energy saving significance of the more significant. Cold storage design, generally based on the annual maximum mechanical load condition determine equipped machine, to meet the demands of heat load peaks in actual operation, however, due to the presence of food cold and other changes in the factors that tend to design the matching of refrigeratory compressor full load run short, low load and run a long time, that most of the time is less than the compressor design load condition run, in our country, the prevailing cold compressor motor load is low. Third, mini refrigerator, micro-energy-saving refrigerator for agricultural production in China's major business management models and rural family economic and technical standards, the development of a simple operation, reliable performance, results and good storage facilities, has obtained the national patent and the 8th China patent new technology and new products Expo Special Gold Award. It can be widely applied in the fruit, vegetable, food, flowers and other agricultural and sideline products and herbal medicine, food, chemical raw materials storage and cooling, suitable for urban and rural families in North and South and collective use, is regulated and vegetable season, local resources for the economy for the carrier.

Refrigeration equipment is the most micro-energy-saving refrigerator from the national vital part of agricultural preservation Engineering Technology Research Center (Tianjin) green star preservation equipment co., Ltd design and manufacture. Green star company mainly development and production and is suitable for rural families, wholesale market, supermarket dedicated supporting refrigeration equipment, frozen freezer equipment, installation of cold storage, and assume various mini refrigerator, large and medium-sized refrigerator, air conditioned cold storage project.

Mini Freezer equipment main features:

(1) mini refrigerator refrigerant charging and debugging in the factory after rigorous testing is complete,At the same installation convenient, just the indoor unit and the outdoor unit with pipe connection, power it can work.

(2) mini cold storage and refrigeration units imported hermetic compressor, main control components can also be used abroad products, so running safe and reliable, trouble-free running time is long.

(3) mini refrigerator automatic control system adopts microcomputer control, temperature control, easy operation, accurate unit with automatic and manual-operation function, there are a variety of automatic protection devices at the same time equipped with electronic temperature display, convenient user observation on the temperature in the cold storage library.

(4) mini cold storage units using heat or electric defrost, defrosting time is short, defrost temperature fluctuations during library.

Mini refrigerator most common specification has two kinds: 90m3 and 120m3 volume, building investment General 1.5 ~ 2.0 million, according to the design of miniature and energy-saving cold storage warehouse, construction elements for cooling down speed, thermal insulation properties, cold storage, temperature fluctuations in the small library empty Library General post within 48 hours, the temperature of cold storage library may be 20 ° c to 0 ° c; fruit early pre-cooling and cooling stages, equipment, power consumption is generally 40 ~ 50 degree temperature stability, cold storage library the day after the power consumption is only 7 ~ 8 degrees, the North in winter can be cold source ventilation, monthly electricity consumption is very low.

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