In the refrigeration process, the fair design of the condenser

Update:07-12-2018
Summary:

In the refrigeration process, the fair design of the co […]

In the refrigeration process, the fair design of the condenser is an important part of improving the energy efficiency ratio of the refrigeration system. The evaporative condenser has high efficiency, small footprint and low energy consumption, and its advantages have been familiar and accepted.

Evaporative condenser is a mixture of water and air as the cooling medium. The latent heat of condensation released by the condensation process of high temperature and high pressure gaseous refrigerant mainly depends on the evaporation of cooling water. In general, in a water-cooled condenser, the temperature rise of the cooling water is generally Δtw = 2 to 6 °C, and can take 8 to 25 kJ of heat per 1 kg of water. The 1 kg water-absorbing evaporation can carry away 2,450 kJ of latent heat, which makes the evaporative condenser run at 1% of the water consumption of the water-cooled condenser. In fact, due to blow-off loss, sewage exchange, etc., the actual water consumption of the evaporative condenser is about 5% to 10% of the general water-cooled condenser [1], which obviously saves the amount of water. Since the evaporative condenser reduces the pressure and flow of the pump, the power consumption of the pump is only 1/4 of that of the cooling tower system.

In addition, the evaporative condenser has only one stage of heat transfer temperature difference for the refrigeration system, and the condensation temperature of the refrigerant in the evaporative condenser is directly related to the meteorological parameters of the environment. According to the degree of perfection of heat and humidity exchange, the condensation temperature is generally 5 to 10 ° C higher than the wet bulb temperature of the air, and the condensation temperature of the evaporative condenser is about 8 to 11 ° C lower than that of the air-cooled condenser, which is lower than that of the water-cooled condenser. Low 3 to 5 °C. The reduction in condensing temperature improves the refrigeration efficiency of the refrigeration compressor and reduces the energy consumed by the compressor. The decrease in condensing pressure prolongs the service life of the compressor and reduces the maintenance cost of the unit.

The evaporative condenser has a compact structure, a small footprint, and is easier to form as a whole during manufacture, and is easy to install. In operation, in addition to energy-saving and water-saving performance, the evaporative condenser also has the function of a cooling tower, so it is not equipped with a cooling tower. The evaporative condenser also eliminates the need for a conventional water-cooled system to build a pump house, a pool, a water pump, a cooling tower, and other ancillary equipment, as well as layout piping and electronic control, etc., so that the cost is too large.

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