Weak current College】 【ice cold and humid air fresh cold storage technology --- Power By】 【China power house network.

<br> 1. introduction <br> <br> Cold storage for fruits and vegetables and flower preservation in the United States and Europe already have more than 100 years old. Ten years ago, the United States first of all with air conditioning technology to .improve cold storage humidity for preservation. This new technology emerging in some countries in Europe immediately aroused great interest, because the Europeans food quality requirements higher than United States persons, they would rather spend more money to buy just picking up fresh fruits and vegetables and flowers .. New technology makes losing few agricultural products, colourful, appearance and taste are all good than traditional cold storage and preservation of many, so this new technology in Europe than in the United States is more extensive. In addition to fresh, ice cold and moist .air into the library preservation of the agricultural products reach the required temperature of the cooling time, cold storage period. Because you do not need to defrost both electricity and avoid the effects of temperature rise of Treasury Treasury product quality. And traditional cold early than, .investment and operation costs are low, so this is a widely used abroad's new technology worthy of reference, research and development to promotion. <br> <br> 2. the shortcomings of traditional preservation methods <br> <br> Traditional freezer use cooling .coils and air cooler units of moisture in the air, continuous condensate Treasury products after a period of time after the moisture loss of cold storage, shrinkage, lose their luster, a drop in quality. Studies have shown that water loss on fruit and vegetable and .flower quality impact is very large, in the preservation process agricultural products and relative water content, ie moisture in total weight at 98%, the effectiveness of quality preservation than relative water content of 90%. In the tradition of cold storage in the cooling coil .surface temperature is below zero degree of moisture in the air is constantly condensation and frost, must periodically defrosting, causes the temperature to rise, if water falling on agricultural products also will accelerate decay. Refrigeration equipment capacity are refrigerated goods from storage temperature begins to cool ., cool to cold temperatures peak load, peak load than the average load during cold storage, so the equipment capacity is big, bulky, high cost. These shortcomings in the use of ice storage and preservation of moist air can avoid after. <br> .<br> 3. ice cold and humid air cooling, refrigeration system working principle and advantages <br> <br> The composition of the system as shown in Figure 1. Cold storage of fruits, flowers, vegetables or placed in the open to working .with boxes and crates, crates stacked into a container format for easy transport. Humid air cooler by a wall decorations in the ceiling, cold moist air to the opposite direction of the wind blowing through the wall, plastic box continuously mixed with air, then back .to the cooler hot wet processing. Each warehouse can design and install one or several air cooler, wet air ventilation times usually 40 times / hour. Air coolers of cold water in close to zero as a cooling medium, it consists of water from the ice .for hit on spray cooler; if wet, with water droplets in the air of the Treasury can cause rot on agricultural products and, therefore, water separator the drops of water from the air. Blowing out from the cooler the air temperature and relative humidity for .1.5 ° c to 98%. <br> <br> <br> <br> Humid air fresh cold storage of maximum advantage of the air flowing through the agricultural products is wet air, long time storage of agricultural produce moisture loss, no shrinkage ., deformation, color, post-marketing customers feeling is "just picking up" so sell well, prices are high. Another outstanding characteristic of the early cooling on the storage of agricultural products with a high speed, in a relatively short period of time to .reach the desired temperature in cold storage. This is because the ice in the ice water can maintain constant freezing point zero, from ice cold temperature close to zero degrees of cooling water efficient use of ice cold energy savings, rapid cooling of air in the library .. In the tradition of cold storage, due to the cooling load in the early stages, the evaporator temperature is high, then gradually reduced, arrived at the long cold temperature (see Figure 2). Therefore, the new gallery agricultural water loss may be .less than the traditional cold storage and preservation of 50 percent. <br> <br> <br> <br> Use of ice storage technology comparison of temperature also after Treasury constant, because the cooling air of the cooling water temperature steady near-zero ., even cooler short downtime, nor does it like traditional freezer temperature rise so quickly drew library. Air temperature always to zero, there is no need to defrost. Agricultural products there will be no risk of frostbite. In the new freezer keep circulating air in .98% relative humidity. Even if the long-term storage of agricultural products, does not like the traditional cold due to condensation, Frost declining agricultural water content. <br> <br> New cold store does not need to set up refrigerant coil, .can reduce the base construction, but also because of the leakage of refrigerant can cause damage to the library collections. <br> <br> Use of ice storage technology refrigeration equipment capacity than traditional freezer small 30%. Because agricultural library cooling initial segment can .use ice for cooling, refrigeration equipment capacity can be determined by average load, while traditional refrigeration equipment capacity is determined by the peak load. Because device capacity reduction in infrastructure costs for small running costs or province. In addition, ice storage application in power at .the time period when the advantages of the valuation. <br> <br>.