A transcritical CO2 air source heat pump system and its control method

By using a transcritical CO2 air source heat pump system, combined with the use of various components and switching valves, the problems of low efficiency and poor reliability of traditional CO2 air source heat pumps in low-temperature environments and high-pressure environments are solved, enabling flexible switching and efficient energy supply under various operating conditions.

CN115615036BActive Publication Date: 2026-06-26POWER RES INST OF STATE GRID SHAANXI ELECTRIC POWER CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
POWER RES INST OF STATE GRID SHAANXI ELECTRIC POWER CO LTD
Filing Date
2022-10-28
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Traditional CO2 air source heat pumps are inefficient in low-temperature environments, and the high working pressure at the high-pressure end leads to poor system reliability. They cannot switch between heating and cooling modes through a four-way reversing valve, resulting in limited functionality.

Method used

The transcritical CO2 air source heat pump system includes a carbon dioxide compressor, a gas cooler, an electronic expansion valve, an outdoor fan, a cold storage device, a hot water storage tank, a high-temperature heat accumulator, a low-temperature heat accumulator, and a floor-mounted heat exchanger. By controlling the combination of various components and switching valves, it can achieve switching between multiple operating conditions such as cooling, heating, and domestic hot water.

Benefits of technology

It achieves efficient cooling, heating and domestic hot water supply in low-temperature environments, avoids high-pressure impacts, improves system reliability, reduces the size of refrigeration equipment and pipes, and enhances heat transfer performance and energy saving.

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Abstract

The application discloses a transcritical CO2 air source heat pump system and a control method thereof. The transcritical CO2 air source heat pump system comprises a carbon dioxide compressor, a gas cooler, an electronic expansion valve, an outdoor fan, a cold storage device, a heat storage water tank, a high-temperature heat accumulator, a low-temperature heat accumulator and a floor buried pipe heat exchanger. The gas cooler comprises a first working medium pipeline and a first heat exchange pipeline for realizing heat exchange. The cold storage device comprises a second working medium pipeline and a second heat exchange pipeline for realizing heat exchange. The heat storage water tank comprises a hot end heat exchange pipeline and a cold end heat exchange pipeline for realizing heat exchange. The transcritical CO2 air source heat pump system can be controlled to be in various working conditions, such as single hot water production, refrigeration and hot water production, single heating, heating and hot water production and the like, by controlling the opening and closing of each component and valve, and is integrated and multipurpose to adapt to different requirements.
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