Advantages and disadvantages of air-cooled ice machines […]
Advantages and disadvantages of air-cooled ice machines and water-cooled ice machines
It is determined by the ambient temperature that the higher the ambient temperature, the higher the condensation temperature. Generally, an air-cooled condenser is used, and the condensation temperature is 7 to 12 ° C higher than the ambient temperature. The value of 7 to 12 ° C is called the heat exchange temperature difference. The higher the condensation temperature, the lower the refrigeration efficiency of the refrigeration unit, so we must control the heat exchange temperature difference should not be too large. However, if the temperature difference of the heat exchange is 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 ° C, not lower than 20 ° C. Air-cooled condensers are not recommended in areas where ambient temperatures exceed 42 °C. So whether you can choose an air-cooled condenser, first confirm the ambient temperature. When designing an air-cooled ice machine in general, customers must be required to provide the highest ambient dry bulb temperature in the country.
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. Air-cooled condensers are not recommended in areas where the ambient temperature exceeds 38 °C. So whether to choose an air-cooled condenser, first confirm the ambient temperature.
Disadvantages: high cost input; higher condensing temperature, lowering the operating efficiency of the refrigeration unit; not suitable for areas with air pollution and dusty weather; cooling performance is determined by the ambient wet bulb temperature, the higher the ambient wet bulb temperature, Then the condensation temperature is also higher. Generally, a water-cooled condenser is used, and the condensation temperature is about 5 to 7 ° C higher than the ambient wet bulb temperature; the temperature limit is not higher than 55 ° C and not lower than 20 ° C. In general, water-cooled condensers are not recommended in areas where the ambient wet bulb temperature exceeds 42 °C. So whether you can choose a water-cooled condenser, first confirm the ambient wet bulb temperature. When designing a water-cooled ice machine, customers must be required to provide the highest ambient wet bulb temperature in the country. At the same time, when the ambient temperature exceeds 50 ° C, the condenser cannot be cooled by water, and the cooling tower is easily exposed to high temperature. The cooling tower must be used with shading protection.
Working principle The high temperature and high pressure refrigerant gas enters the shell side of the condenser from the inlet above the condenser. The cooling water pump draws the cooling water from the water storage tank of the cooling tower and enters the condensation through the water inlet below the right side of the condenser. In the tube of the tube, heat exchange with the refrigerant outside the condenser copper tube, the temperature rises, exits from the water outlet above the right side of the condenser, passes through the outlet pipe, enters the inlet pipe of the cooling tower, and then sprinkles The water outlet of the pipe is evenly sprinkled on the packing, and the heat is exchanged with the water in the packing by the fan suction, so that the water temperature is lowered, and the cooled water is stored in the water storage tank to be reused. The high temperature and high pressure refrigerant gas is heat exchanged with the cooling water flowing in the tube in the shell side of the condenser, and the temperature is lowered.