Carbon dioxide cascade heat pump system

Abstract

A carbon dioxide cascade heat pump system comprises a common heat pump refrigeration cycle and a carbon dioxide heat pump refrigeration cycle, wherein the common heat pump refrigeration cycle comprises a first control valve (5), an ice maker (15), an evaporative condenser (7) and a cold and hot water heat exchanger (12) which are sequentially arranged, the evaporative condenser (7) is communicated with a second compressor (9) through a reversing valve (8), the second compressor (9) is sequentially communicated with the cold and hot water heat exchanger (12) and the first control valve (5) through the reversing valve (8), and a second expansion valve (10) is arranged between the ice maker (15) and the cold and hot water heat exchanger (12). A refrigerant working medium of a high-temperature section enters the ice maker for primary heat exchange, enters the evaporative condenser after absorbing heat, absorbs heat of a low-temperature section for secondary heat exchange, enters the cold and hot water heat exchanger after being compressed by the reversing valve and the second compressor, and then returns to the second expansion valve to complete circulation of the high-temperature section, so that ice is made while heating is performed, and secondary utilization of energy is realized. The system is particularly suitable for extremely cold areas.

Description

technical field [0001] The invention belongs to the technical field of heat pumps, and in particular relates to a carbon dioxide cascade heat pump system, which is especially suitable for extremely cold regions. Background technique [0002] A heat pump is a device that can transfer heat energy from a low-level heat source to a high-level heat source. Usually, it first obtains low-grade heat energy from natural air, water or soil, and then provides high-grade heat energy that can be used by people. . [0003] The carbon dioxide cascade heat pump system can be applied to heating. It has two sets of circulation systems, one is the gas circulation of the low-temperature section through carbon dioxide, and the other is the liquid circulation of the high-temperature section through Freon, etc., and the two sets of circulation The system can be connected together through the evaporative condenser, and the effect of heat exchange and heating can be realized when the evaporative co...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies in the above-mentioned prior art, the present invention provides a carbon dioxide cascade heat pump system to solve the problem that the energy consumed in the circulation process of the existing heat pump system can only be used for heating, and the use of ice making at the same time as heating cannot be realized. Requirements, and the lack of secondary energy utilization technology issues

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