Method for achieving refrigerating in extremely cold environment and achieving heating in extremely hot environment by air-cooled cold and hot water unit

Abstract

The invention relates to a method for achieving refrigerating in an extremely cold environment and achieving heating in an extremely hot environment by an air-cooled cold and hot water unit. The method comprises the steps that S1, the air-cooled cold and hot water unit is built; S2, a refrigerating mode is switched; S3, refrigerating work is executed; S4, a heating mode is switched; and S5, heating work is executed. According to the method, the switching of the refrigerating mode and the heating mode of the air-cooled cold and hot water unit is achieved by adjusting a four-way reversing valve,the annual refrigerating function and the annual heating function are integrated on one unit, and the special working condition requirements of customers can be met; and through the mode that a firstfixed-frequency fan unit, a second fixed-frequency fan unit and a variable-frequency fan unit are combined with one another, the number control of the fixed-frequency fan units is combined with the control logic of variable-frequency adjustment of the variable-frequency fan unit, the air-cooled cold and hot water unit is matched to work and operate at a specific temperature, the effective operation range of the working temperature of the air-cooled cold and hot water unit is expanded, and normal refrigerating at an environment temperature of minus 20 DEG C or more and normal heating at an environment temperature of 40 DEG C or lower are achieved.

Description

technical field [0001] The invention relates to a method for cooling in an extremely cold environment and heating in an extremely hot environment for an air-cooled hot and cold water unit, and belongs to the technical field of air conditioning. Background technique [0002] For air-cooled chiller products, when customers have cooling needs in winter, they can use the method of frequency conversion and speed regulation of fans to maintain the high pressure of the unit to ensure the stable operation of the unit; for year-round heating hot water units, when customers need In the transitional season or when heating in summer, the suction pressure regulating valve can be used to prevent the low pressure from being too high, and prevent the power and current from being too large, so as to ensure the stable operation of the unit. [0003] At present, the above functions are realized by two products respectively, and the products cannot be cooled at the ambient temperature of -20°C ...

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Problems solved by technology

[0003] At present, the above functions are realized by the two products respectively, and the products cannot be cooled at the ambient temperature of -20°C or heated at the ambient temperature of 40°C, which cannot meet the special requirements of specific environments. main flaw

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