Analysis of the power consumption of two kinds of industrial chillers, air-cooled chillers and water-cooled chillers.
        Air cooled chillers are expensive, bulky and noisy, and these are facts. However, the comparative power consumption of literature is by no means comprehensive. The text 3520KW (1000USrt) cooling capacity is based on the comparison between air-cooled chillers and chillers, and as a result, air cooled chiller systems are more efficient than water-cooled chiller systems 350KW. If the whole summer, the greater power.
        Air cooling unit of high price, large noise, if the operation cost really is much higher than the water-cooled unit, then (according to the original ratio of 28%), then it will not win the market, but also can not explain the fact that the operation of large air-cooled chiller has tens of thousands of.
        There are two questions that should be clear: an installed capacity of the unit is not equal to energy consumption; second, full load and part load operation of the unit operation efficiency and energy consumption are different.
        Full load, chilled water temperature higher than the water-cooled condensing units, where the pressure of the air cooled chiller power machine, but the distribution of the summer air conditioning load imbalance, even in the one hour, every load is very different, according to the unit's running time maximum load is very limited. According to the general statistics, air conditioning load in more than 90% of the time only full-time 7% ~ 8%, while the proportion of the load will be accounted for up to 50% of the 60%, which is not in the summer in the full load operation of chillers. Therefore, the use of installed capacity equipment (or at full load input power) as the basis for the annual comparison of electricity consumption is obviously inappropriate.
        he condensing temperature of air-cooled chillers depends on the outdoor dry bulb temperature, and the water-cooled chiller and condensing temperature depend on the outdoor wet bulb temperature. On a single day, the outdoor air dry bulb temperature is much greater than the wet bulb temperature. In southern Chinese, summer daytime temperatures generally in every 8? 10 degrees, more arid regions, even as high as 15? 16 DEG C, the wet bulb temperature changes in a day is very small (dry bulb temperature only 1 / 5). In this way, the temperature of the water cooled condensing unit in a single day is almost unchanged, while the air cooling unit in the outdoor dry bulb temperature will drop. Said air-cooled units must be superior to the condensing temperature high water cooling 5 to 10 C, and the resulting air cooling units must be better than the water-cooled unit is obviously not correct conclusions.
        The United States has taken energy consumption Trane centrifugal chiller and air cooled centrifugal chiller in full load and part load, and its results in refrigeration capacity (1160KW (330USrt) is headquartered in the whole load, air-cooled chiller energy consumption than water-cooled chiller, about 15%, but in February 3rd between the two countries is basically the same load, and the air cooling unit is slightly lower, while in the 1 / 3 load, air cooling units, far less than the water-cooled units, about 30% lower. Therefore, in general, air cooled chiller and annual energy consumption of not less than a large number of water-cooled units, together with the equipment maintenance of the water cooling device (maintenance of cooling tower system, water treatment, condenser cleaning etc.) is higher than the air cooling unit, the total cost of operation of air cooling unit may also be slightly lower than the water cooling unit.