Solar-jet and two-stage compression combined heat pump system

Abstract

The invention discloses a solar-jet and two-stage compression combined heat pump system, consisting of a solar-jet system and a two-stage steam compression system, wherein the solar-jet system consists of a heat collecting system and a jet system; and the two-stage steam compression system consists of a one-stage steam compression system and an outdoor-side double-stage steam compression auxiliary system. Under the condition with sufficient solar energy, a cascade circulation scheme of the solar-jet system and the one-stage steam compression system is adopted; under the condition that the solar energy can not meet the system operation, the scheme for simultaneous operation of cascade circulation of the solar-jet system and the one-stage steam compression system and the outdoor-side double-stage steam compression auxiliary system is adopted; and under the condition without the solar energy, the operation scheme of the outdoor-side double-stage steam compression auxiliary system is adopted. The solar-jet and two-stage compression combined heat pump system disclosed by the invention has the advantages that high-efficiency utilization of the solar energy can be realized, the operation efficiency of the whole system is high, the GWP (Global Warming Potential) is low, the environment-friendly effect is good, and fast switching can be achieved according to different operation modes.

Description

technical field [0001] The present invention relates to a heat pump system, more specifically, relates to a combined heat pump system of solar injection and compression. Background technique [0002] Solar energy is an inexhaustible, inexhaustible and non-polluting ultra-clean renewable energy. In the current situation of high oil prices and intensified global warming, the development and utilization of this renewable energy is of great significance. Using solar energy to completely replace or partially replace conventional energy to drive heat pump systems is an important means to save energy at home and abroad and alleviate the energy crisis, and it is increasingly valued by countries all over the world. At the World Solar Energy Conference held in 1999, some experts believed that there are two basic trends in the development of solar energy technology in the contemporary world. Experts agree that solar energy is the most suitable, safest, and ideal alternative energy so...

AI Technical Summary

Problems solved by technology

However, this system cannot realize the cooling operation of the solar injection system and the electric compression system at the same time. When designing the system, the solar heat collection area will be large, and the working principles of the two systems are different. When sharing a set of evaporator and condenser When , it will put forward high requirements on the operation control strategy, and then generate higher operation control costs

When the solar injection system cannot meet the air-conditioning load requirements of the building alone, it can only rely on the electric compression refrigeration system, and the solar injection refrigeration is in a stopped state, resulting in unnecessary waste of solar energy

[0008] To sum up, there are still big problems in the combined system of solar injection and compression at present, and the form of the system is still far from perfect, which has caused a waste of solar energy resources to a large extent.

In addition, with the continuous replacement of refrigerants, the conventional injection system can no longer meet the development requirements of refrigerants. The continuous rise of low-greenhouse potential (GWP) refrigerants has also injected new vitality into solar jet refrigeration, such as The application of 2,3,3,3 tetrafluoropropene (HFO1234yf) and 1,3,3,3 tetrafluoropropene (HFO1234ze) is similar in performance to R134a. Comparing the application of R134a in the injection system, it can be seen that its application prospect is better. it is good

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