Auto-cascade heat pump circulating system

Abstract

The invention belongs to the field of energy source power engineering and relates to an auto-cascade heat pump circulating system. An outlet of a compressor is connected with an inlet of an oil-gas separator. An opening A, an opening B, an opening C and an opening D of a four-way valve are connected with an outlet of the oil-gas separator, a second end opening of an evaporator, an inlet of a gas-liquid separator and a first end opening of an air cooled condenser correspondingly. An inlet of a separation liquid storage device is connected with a second end opening of the air cooled condenser and a first end opening of the evaporator. A liquid phase outlet of the separation liquid storage device is connected with a first inlet of an evaporation type condenser through a first throttling assembly. A gas phase outlet of the separation liquid storage device is connected with a second inlet of the evaporation type condenser. A first outlet of the evaporation type condenser is connected with an inlet of the compressor. A second outlet of the evaporation type condenser is connected with a second end opening of an air cooled condenser and a first end opening of the evaporator through a second throttling assembly. The auto-cascade heat pump circulating system overcomes the existing theory limitation and technological bias and is wide in application working condition range, high in energyefficiency ratio and small in attenuation under the low-temperature working condition.

Description

technical field [0001] The invention belongs to the technical field of energy and power engineering, and relates to a heat pump circulation system, in particular to a self-cascading heat pump circulation system. Background technique [0002] 1. The concept of heat pump [0003] Heat pump, according to the definition of the New International Dictionary of Refrigeration, a heat pump is a refrigeration system that uses the heat released by the condenser to provide heat. In fact, a heat pump is an application of a refrigerator. In terms of thermodynamics or working principle, both are heat transfer tools, but the refrigerator appeared earlier. In a broad sense, they are collectively called "heat pumps". more relevant. The main differences between the two are: First, the purpose of the two is different. The purpose of the refrigerator is to obtain low temperature; A refrigerator uses ambient temperature as a high-temperature heat source; a heat pump uses ambient temperature as...

AI Technical Summary

Problems solved by technology

There are only short introductions in various textbooks and materials, and few people have tried it in the field of heat pumps. Usually this cycle is considered unsuitable for heat pump systems

In addition, the types of working fluids that are really suitable for heat pumps and used in segregation cycles in the market are hardly mentioned, and there are no ready-made materials for reference

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