News

What are the main features of the ice maker? What are the advantages and disadvantages?(1)

Update:15-10-2020
Summary:

1. Air-cooled condensing appliance Determined by the am […]

1. Air-cooled condensing appliance
Determined by the ambient temperature, the higher the ambient temperature, the higher the condensation temperature. Generally, an air-cooled condenser is used, and the condensing temperature is 7-12°C higher than the ambient temperature. This value of 7-12°C is called the heat exchange temperature difference. The higher the condensing temperature, the lower the refrigeration efficiency of the refrigeration unit, so we must control this heat exchange temperature difference should not be too large. However, if the temperature difference of heat exchange is to be too small, the heat exchange area of ​​the air-cooled condenser and the circulating air volume will be larger, and the cost of the air-cooled condenser will be higher.
The temperature limit is not higher than 55℃ and not lower than 20℃. Generally, air-cooled condensers are not recommended in areas where the ambient temperature exceeds 42°C. Therefore, whether to choose an air-cooled condenser, first confirm the ambient temperature. Generally, when designing an air-cooled ice machine, the customer must be required to provide the highest ambient dry bulb temperature in the local year.
The higher the ambient temperature, the lower the heat dissipation efficiency of the air-cooled condenser and the worse the cooling efficiency. The temperature limit of the air-cooled condenser is not higher than 50°C and not lower than 20°C. Generally, air-cooled condensers are not recommended in areas where the ambient temperature exceeds 38°C. Therefore, whether to choose an air-cooled condenser, first confirm the ambient temperature.
advantage
No water resources are required, and operating costs are low.
Easy to install and use, no other supporting equipment is needed, it can be put into operation as long as the power is turned on
Does not pollute the environment.
It is suitable for areas with severe water shortage or rare water supply.
Disadvantage
Higher cost investment.
The high condensing temperature reduces the operating efficiency of the refrigeration unit.
Not suitable for areas with dirty air and dusty climate.
Cooling performance
It is determined by the ambient wet bulb temperature. The higher the ambient wet bulb temperature, the higher the condensation temperature. Generally, a water-cooled condenser is used, and the condensation temperature is about 5 to 7°C higher than the ambient wet bulb temperature.
Temperature limit
Not higher than 55℃, not lower than 20℃. Generally, water-cooled condensers are not recommended for areas where the ambient wet bulb temperature exceeds 42°C. Therefore, whether to choose a water-cooled condenser, first confirm the ambient wet bulb temperature.
Generally, when designing a water-cooled ice maker, the customer must be required to provide the highest ambient wet bulb temperature throughout the year. At the same time, when the ambient temperature exceeds 50 ℃, the condenser cannot be cooled with water, and the cooling tower is easily damaged by the high temperature. The cooling tower must be used under sun protection.
working principle
The high-temperature and high-pressure refrigerant gas enters the shell side of the condenser through the air inlet above the condenser, and the cooling water pump pumps the cooling water out of the water storage tank of the cooling tower, and enters the condenser through the water inlet at the bottom right In the tube pass, it exchanges heat with the refrigerant outside the copper tube of the condenser. The temperature rises. It comes out from the water outlet on the upper right side of the condenser, passes through the water outlet pipe, and enters the water inlet pipe of the cooling tower. The water outlet is evenly sprinkled on the filler, and the fan is sucked by the fan to exchange heat with the water in the filler to reduce the water temperature. The cooled water is stored in the water storage tank for reuse.
In the shell side of the condenser, the high temperature and high pressure refrigerant gas exchanges heat with the cooling water flowing in the tube side, the temperature is reduced, and it is condensed into liquid. The exhaust heat of the refrigeration unit first exchanges heat with water (heat exchange that occurs in condensation), and then water exchanges heat with air (heat exchange that occurs in the cooling tower).
2. Evaporative condenser
The evaporative condenser uses the latent heat of evaporation of spray water, uses ambient air as the medium, and uses the ambient wet bulb temperature as the temperature difference for heat exchange. It has low condensation temperature, large heat transfer temperature difference, sufficient heat exchange, low power consumption, stable performance, etc. advantage.

www.mxhuge.com

0
Views: 57