Low-temperature air source and ground source dual-source heat pump unit and control method thereof

Abstract

The invention relates to a low-temperature air source and ground source dual-source heat pump unit and a control method thereof, aiming at solving the problems that the heating capacity of an air source heat pump under a low-temperature environment is reduced and soil heat absorption and discharge of a ground source pump are not balanced. The low-temperature air source and ground source dual-source heat pump unit comprises a low-pressure compressor, a high-pressure compressor, a four-way reversing valve, a refrigerant-water heat exchanger, a refrigerant-air heat exchanger, a refrigerant-ground source water heat exchanger, a primary expansion valve and a secondary expansion valve, wherein the refrigerant-air heat exchanger is used for exchanging heat with outdoor air, the refrigerant-ground source water heat exchange is used for exchanging heat with circulating water in a soil buried pipe, and the refrigerant-water heat exchanger is used for exchanging heat with user circulating water. By adjusting the four-way reversing valve, the heat pump unit can be enabled to be in heating and refrigeration states. The heat pump unit provided by the invention not only can effectively use the air as an auxiliary heat source to solve the problem of unbalanced soil heat absorption and discharge, but also can solve the technical problems that the heat supply operation efficiency of the air source heat pump in winter is low, the operation stability and reliability are poor and the like to achieve the goal of improving the energy-efficiency ratio and operation reliability of the unit.

Description

technical field [0001] The invention relates to the technical field of heat pumps, in particular to a low-temperature air-source ground-source dual-source heat pump unit and a control method thereof. Background technique [0002] At present, energy shortage and environmental pollution have become two prominent problems restricting global sustainable development, and have attracted more and more attention from all countries in the world. In addition, with the development of society and the improvement of people's living standards, energy consumption for heating, air conditioning and domestic hot water production accounts for an increasing proportion of the total energy. For this reason, vigorously developing and effectively utilizing renewable energy has become a priority development strategy for all countries. The use of energy in the air and ground energy for heating and air conditioning conforms to the scientific energy use principle of "corresponding temperature and casc...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the shortcomings and deficiencies of the above-mentioned prior art, the present invention aims to solve the problem of attenuation of the heating capacity of the air source heat pump and the unbalanced heat absorption and discharge of the soil of the ground source heat pump in the low temperature environment, and make full use of the mature technologies of the existing air source heat pump and ground source heat pump and advantages, and provide a new low-temperature air-source ground-source dual-source heat pump unit and its control method

The heat pump unit of the present invention can not only effectively use air as an auxiliary heat source, solve the problem of unbalanced soil heat absorption and discharge, but also solve technical problems such as low heating operation efficiency, poor operation stability and reliability of the air source heat pump in winter, and improve the energy efficiency ratio of the unit and operational reliability purposes

Images