Phase-change energy storage double-evaporator solar heat pump heating system and control method thereof

Abstract

The invention relates to a phase-change energy storage double-evaporator solar heat pump heating system. The phase-change energy storage double-evaporator solar heat pump heating system aims to overcome the defects that a water tank of an existing solar water source heat pump heating system is not high in heat storage capacity, circulating water of the system is prone to freezing in extreme weather and operation reliability is low. A phase-change energy storage water tank is adopted to increase the heat storage capacity, a cylindrical phase-change unit is developed to enhance the heat exchange effect, double evaporators (a water-cooled type evaporator and an air-cooled type evaporator) are adopted, and when the energy efficiency value of the system in a water-cooled mode is lower than that of the system in an air-cooled mode under the same working conditions as the heat storage capacity of the water tank is insufficient or it is cold weather, the system can be switched into an air-cooled evaporator mode to be maintained to operate stably and efficiently. An intelligent control algorithm is developed, and automatic control is achieved according to the system energy efficiency and the temperature of outlet water of a heat collector. The system is a heating system which is technically feasible, convenient to control and high in operation efficiency and saves operation expenses. The system is particularly suitable for the areas with dry climate and rich solar energy.

Description

technical field [0001] The invention belongs to the technical field of civil engineering building environment and energy application engineering disciplines, and specifically relates to a phase change energy storage double evaporator solar heat pump heating system and a control method thereof. Background technique [0002] In recent years, China's economy has developed rapidly, the process of industrialization has accelerated, and energy consumption has increased. In response to the national call for "energy conservation and emission reduction", we adhere to the road of sustainable development. It is urgent to promote the application of new energy and new energy-saving materials in our country. [0003] As a natural energy, solar energy has shown its unique advantages due to its abundant reserves and non-pollution, and has been recognized by the international community as one of the most competitive energy sources in the future. Combining solar energy utilization with buil...

AI Technical Summary

Problems solved by technology

However, due to the small heat storage capacity of conventional heat storage tanks and the instability and intermittent nature of solar energy, when the intensity of solar energy is insufficient, the storage capacity of the water tank will be insufficient, resulting in a low energy efficiency ratio of the system

When the outdoor temperature is very low in winter and the heat storage capacity of the water tank is insufficient, if you continue to draw heat from the water source heat pump, it may cause the circulating water in the system to freeze, affecting the normal use of the system

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