From the market point of view, the condensation methods of flake ice machines are roughly divided into two types: air-cooled and water-cooled. But what is the difference between air-cooling and water-cooling? What are the advantages and disadvantages of air-cooling and water-cooling? I think there may be some customers who don't know enough. Today I will tell you the difference between air-cooling and water-cooling.
Air-cooled condenser
As the name suggests, the air
ice machine suppliers-cooled flake ice machine uses an air-cooled condenser.
Cooling performance:
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℃ higher than the ambient temperature. This value of 7~12℃ 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 must 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℃. Under normal circumstances, it is not recommended to use air-cooled condensers 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 flake ice machine, the customer must be required to provide the highest ambient dry bulb temperature throughout the year in the local area. Air-cooled condensers cannot be used in areas where the ambient temperature exceeds 40°C.
advantage:
1. No need of water resources, low operating cost.
2. It is easy to install and use, no other supporting equipment is needed, and it can be put into operation as long as it is connected to the power supply without polluting the environment.
3. It is suitable for areas with severe water shortage or rare water supply.
Disadvantages:
1. Higher cost investment.
2. The high condensing temperature reduces the operating efficiency of the refrigeration unit.
3. Not suitable for areas with dirty air and dusty climate.
Water-cooled condenser
The same water-cooled flake ice machine uses a water-cooled condenser.
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 condensing temperature is about 5~7°C higher than the ambient wet bulb temperature.
Temperature limit
Not higher than 55°C, not lower than 20°C. Under normal circumstances, it is not recommended to use water-cooled condensers in 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 flake ice machine, the customer must be required to provide the highest ambient wet bulb temperature throughout the year. At the same time, when the ambient wet bulb temperature exceeds 50°C, 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. The cooling water pump pumps the cooling water out of the water storage tank of the cooling tower, and enters the condenser through the inlet on the right side of the condenser. In the pipe pass, it exchanges heat with the refrigerant outside the copper tube of the condenser, and 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.
The high-temperature and high-pressure refrigerant gas exchanges heat with the cooling water flowing in the tube side in the shell side of the condenser, reduces the temperature and condenses into a 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 cooling towers)
