Application analysis of cold storage evaporator

As one of the four pieces of refrigeration evaporator, the refrigeration system plays a very important role, so the compressor and the evaporator only up to make the reasonable matching of refrigeration system play a better effect, so the evaporator selection is very important in the whole refrigeration system. In the cold storage, the two most common evaporators are the cold air blower and the exhaust pipe:
1, the envelope structure
Regardless of the cold storage of civil or steel structure, we must consider the top load, in the design of the suspension load. Making pipe made of seamless steel pipe, the design of suspended load reference value of 70~80Kg/ square meters; if the Aluminum Alloy control for the top row of tubes, the design of suspended load reference value of 40~50Kg/ square meters; if the cooling fan, only need to consider the suspension load of local air cooler.
2, refrigerant charge
Cooler area is small, the volume is relatively small, so the volume of fluoride air cooler in the refrigeration system on the proportion of small pipe diameter; from the Phi Phi 38 22~ range, the larger the diameter containing fluorine content in the whole refrigeration system on increasing.
The exhaust pipe is usually more than ~4 times more than that of the air hangar. In the subsequent rise in the price of freon and freon in the form of replacement, freon cost is not part of the.
3, the initial investment
From the selection of evaporator, the initial investment of aluminum pipe is generally greater than the initial investment of the air cooler. The total cost of the system is less than 15%~25% with the aluminum exhaust pipe system, and the bigger the system, the more obvious the difference between them. General row pipe production and erection than the installation of the cold air blower construction cycle to be high 3~4 times, so the use of the production and installation of pipe on the installation of labor costs than in the use of the installation of the wind turbine labor costs much higher. Developed countries in the cold storage cold air cooling machine is used, on the one hand is also taking into account this factor (foreign labor costs much higher than the domestic).
4, defrost way
At present, there are some common defrosting methods in cold storage air cooler, such as: natural cream, water defrosting, electro chemical cream and hot fluorine defrosting. Relatively easy to achieve automatic frost thawing cooler, defrosting water with defrosting of air cooler flow to downpipe cold storage. Aluminum Alloy pipe is widely used in hot Freon defrosting, but exhaust pipe in the water when the frost distribution warehouse Guanghua will go down, so the defrosting in general to transfer goods or waterproof plastic cloth cover, as cooler defrost so flexible and convenient.
5, the latter power consumption
Under the same other conditions, the forced convection cooling fan on fan driven motor work and cooler defrost 1-2 times a day to produce a certain amount of power consumption; for pipes, pipe to pipe natural convection, generally a year in addition to 2 times from the late frost, the power consumption of aluminum row ratio. Tube cooler than relative to save.
6, cold storage capacity
The cold air blower belongs to the forced convection, the cooling speed is fast; the aluminum tube belongs to the natural convection, and the cooling rate is relatively slow. Therefore, in the actual cold storage operation, if the main refrigeration equipment matching is basically the same, the cold air hangar and the exhaust pipe library, the compressor start-up time is not much difference.
Aluminum pipe cold storage capacity to maintain the overall temperature is not much effect on the temperature plays an important role in maintaining or practice in the library body enclosure structure and heat preservation, storage capacity and storage of goods. The use of multi layer, civil frame internal polyurethane foam spray cold storage than the use of single layer, steel structure, polyurethane sandwich double color steel plate cold storage structure of the operation of electricity to save much more;
7, dry goods consumption
The main influencing factors of the dry consumption are: the temperature difference of the heat transfer, the speed of the wind, the working time of the evaporator and the way of packing.
Generally speaking, the use of cold air cooler storage of dry goods to be greater than the use of cold storage. But pay attention to the number of dry consumption is the main body of goods rather than cold storage or evaporator. So what kind of evaporator is the most reasonable, the key question is what kind of storage, how to pack the goods. Plastic bags sealed packaging of goods need not consider dry consumption problem.
8, the utilization rate of funds
Mentioned in the construction period of the gap between the air cooler and the two row, row tube, long construction period are Zhanya funds, air coolers can be quickly put into short construction period, earlier to get a return on investment, leading to occupy the market. If the cold rent of about 3 yuan / square meters. A month, the rental return is not a small figure.
9, efficiency and quality stability
Air cooling machine belongs to the type of mature products, by skilled workers, factory specialized production line assembly, and pipe field assembly, has great influence on the uniform level of assembly workers liquid supply pipe, liquid cooling fan uniformity is relatively good.
The fault point cooler is mainly for motor and electrical components running parts, as long as the use of well-known brand products, such as EBM, Xerox, SIEMENS, Schneider, Bai and other products, the failure rate is reduced; and the exhaust pipe especially Aluminum Alloy pipe, because the welding process requirements of high rigidity and relatively poor, so if welding is not good, or when lifting appear uneven stress, pipe leakage probability is very high. With more and more attention to the safety of refrigeration system, quality control equipment will be more and more standardized, standardized production and management will become the pipes of an insurmountable threshold as one of the four pieces of refrigeration evaporator, the refrigeration system plays a very important role, so the only reasonable matching of the compressor and the evaporator it can make the whole refrigeration system play a better effect, so the selection of evaporator is crucial in the whole refrigeration system. In the cold storage, the two most common evaporators are the cold air blower and the exhaust pipe: