1. Characteristics of air-cooled condensing unit for cold room
Determined by the ambient temperature, the higher the ambient temperature, the higher the condensation temperature. Generally, the air-cooled condensing unit for cold room is used, and the condensation temperature is 7-12 ℃ higher than the ambient temperature. The value of 7-12 ℃ is called heat exchange temperature difference. The higher the condensation temperature is, the lower the refrigeration efficiency of the refrigeration unit will be, so we need to control the heat exchange temperature difference not to be too large. However, if the temperature difference of heat exchange is too small, the larger the heat exchange area and circulating air volume of air-cooled condenser, the higher the cost of the air-cooled condenser. Temperature limit: not higher than 55 ℃, not lower than 20 ℃. Generally, air-cooled condensers are not recommended in areas where the ambient temperature exceeds 42 ℃. Therefore, whether air-cooled condenser can be selected should first confirm the ambient temperature. Generally, when designing air-cooled ice maker, customers must provide the highest ambient dry bulb temperature in the whole year.
Advantage of cold room air cooler
There is no need for water resources and the operation cost is low.
It is easy to install and use. No other supporting equipment is needed. It can be put into operation as long as the power is connected
Do not pollute the environment.
It is suitable for areas with serious water shortage or hard to supply water.
Disadvantage of cold room air cooler
The higher the condensation temperature, the lower the operating efficiency of the refrigeration unit.
It is not suitable for areas with dirty air and dusty climate.
2. Characteristics of the water-cooled condensing unit for cold room
It is determined by the ambient wet-bulb temperature. The higher the ambient wet-bulb temperature is, the higher the condensation temperature is. Generally, a water-cooled condenser is used, and the condensation temperature is about 5-7 ℃ higher than the ambient wet-bulb temperature. Temperature limited: not higher than 55 ℃, not lower than 20 ℃. Generally, water-cooled condensers are not recommended in areas where the ambient wet-bulb temperature exceeds 42 ℃. Therefore, whether the water-cooled condenser can be selected should first confirm the ambient wet-bulb temperature.
In general, when designing a water-cooled ice maker, customers must be required to provide the highest ambient wet-bulb temperature throughout the whole year. At the same time, when the ambient temperature is more than 50 ℃, the water-cooled condenser can not be used, and the cooling tower is easy to be damaged by high temperature. The cooling tower must be used with sunshade protection.
Advantages of the water-cooled condenser
Make the condensing temperature of the refrigeration unit low and improve the refrigeration efficiency.
The initial investment cost is lower than air cooling and evaporation cooling.
The good cooling effect, suitable for the medium and large refrigeration systems.
Disadvantages of the water-cooled condenser
Water spray has some impact on the surrounding environment.
The water system and water supply system need to be installed.