A carbon dioxide heat pump system

Abstract

The application relates to a carbon dioxide heat pump system, which comprises a carbon dioxide circulation group, a first compression circulation group, a second compression circulation group, a first water circulation and a second water circulation which are connected; the carbon dioxide circulation group comprises a carbon dioxide compressor, a first evaporative condenser, a gas cooler, an evaporative cooler, a first expansion valve, a gas-liquid separator and an evaporator which are connected in sequence through pipelines; the gas outlet of the carbon dioxide compressor is connected to the first evaporative condenser, and the gas inlet is connected to the evaporator; the first water circulation exchanges heat with the first evaporative condenser through a first compression circulation; and the second water circulation exchanges heat with the gas cooler or exchanges heat with the evaporative cooler through a second compression circulation. The carbon dioxide heat pump system designed by the application can be switched among three working modes, can meet different heating water demands of users, is more energy-saving and has higher energy utilization.

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