Geothermal heat exchanger and heat pump type air conditioner utilizing geothermal heat

Abstract

PROBLEM TO BE SOLVED: To provide a geothermal heat pump type air conditioner for saving energy by reducing load of a hydrothermal heat pump, generating no heat exchange loss owing to high heat exchange efficiency of an underground heat exchanger and for making it easy to process the underground heat exchanger, bore a hole for burying the underground heat exchanger and conduct a burial work. ŽSOLUTION: The geothermal heat pump type air conditioner consists of the underground heat exchanger 7 equipped with a resin supply pipe part 1 through which a heat medium spirally flows downward underground near an earth surface and a return pipe part 2 for returning the heat medium out from the supply pipe part 1 to above the ground, a water coil 8 for conducting heat exchange of air for air supply by flowing the heat medium which is heated and / or cooled by the underground heat exchanger 7 and a water heat source heat pump 9 for conducting heat exchange of a circulation refrigerant by flowing the heat medium and for conducting heat exchange of the air for air supply via the water coil 8 by the circulation refrigerant. Ž

Description

technical field [0001] The present invention relates to an underground heat exchanger and a geothermal utilization heat pump type air conditioner equipped with the underground heat exchanger. Background technique [0002] The underground temperature is approximately constant throughout the year at a position deeper than a predetermined depth. Taking advantage of the characteristics of this underground temperature, an air-conditioning system that utilizes geothermal heat for air conditioning has been developed. Underground heat that maintains a constant temperature uses a heat medium to collect heat through a heat exchanger. [0003] A heat exchanger used in an air-conditioning device using geothermal heat has a U-shaped round-trip pipe part through which heat medium can pass. The U-shaped part of the round-trip pipe part is inserted and buried by digging a hole to the deep part of the ground. Heat exchange is performed between the geothermal heat of the surrounding soil an...

AI Technical Summary

Problems solved by technology

However, when heat is collected intensively in a narrow area underground, for example, in winter, since the heat per unit volume taken from the underground soil increases, it takes a long time for the underground temperature to recover, so the heat collected continues to decrease and the air conditioner cannot operate , or antifreeze must be used to prevent freezing, so there are problems such as environmental pollution

[0010] In addition, in the U-shaped underground heat exchanger, since the heat medium flows through the same path in the forward path and the return path, for example, in winter, it is easy to release heat from the heat medium that collects heat until the heat medium returns to the surface. There is a problem with potentially significant heat loss

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