Ground-source heat pump system based on downhole heat exchanger and direct-expansion carbon dioxide heat pump

Abstract

The invention discloses a ground-source heat pump system based on a downhole heat exchanger and a direct-expansion carbon dioxide heat pump. The ground-source heat pump system based on the downhole heat exchanger and the direct-expansion carbon dioxide heat pump comprises the downhole heat exchanger, the downhole heat exchanger comprises a water well and a heat exchange tube, the water well is filled with water which is not exchanged with underground water, the heat exchanger tube is connected with a heat pump unit, the heat exchange tube is correspondingly used as an evaporator and a condenser of the heat pump unit during winter heating and summer cooling, and the heat pump unit is a direct-expansion heat pump unit. The ground-source heat pump system based on the downhole heat exchanger and the direct-expansion carbon dioxide heat pump improves the efficiency of heat exchange with underground soil by the downhole heat exchanger and avoids the use of underground water, carbon dioxide with high heat exchange efficiency and no damage to an ozone layer and underground environment is used as the circulating working medium of the heat pump unit, and the overall energy saving and environmental protection of the ground-source heat pump system are fully exerted.

Description

technical field [0001] The invention belongs to the technical field of ground source heat pumps, and in particular relates to a ground source heat pump system based on an underground heat exchanger and a direct expansion carbon dioxide heat pump. Background technique [0002] The traditional ground source heat pump system is divided into buried pipe ground source heat pump system and ground water source heat pump system. Among them, the buried pipe ground source heat pump system uses high-density polyethylene pipes as underground heat exchange pipes. The unit heat transfer capacity of heat exchange pipes is relatively low, generally only around 50W / m, and the system requires a large number of underground heat exchange pipes. It occupies a large area and is not suitable for application in cities. [0003] However, the groundwater source heat pump system uses groundwater for cooling and heating, and the recharge effect is poor. It is difficult to achieve 100% recharge of grou...

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Problems solved by technology

Among them, the buried pipe ground source heat pump system uses high-density polyethylene pipes as underground heat exchange pipes. The unit heat transfer capacity of heat exchange pipes is relatively low, generally only around 50W / m, and the system requires a large number of underground heat exchange pipes. It occupies a large area and is not suitable for application in cities

[0003] However, the groundwater source heat pump system uses groundwater for cooling and heating, and the recharge effect is poor. It is difficult to achieve 100% recharge of groundwater, and long-term use can easily induce land subsidence

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