A mixed working fluid compression cycle system with mechanical heat recovery and its working method

Abstract

The present invention relates to the present invention provides a mixed working medium compression cycle system with mechanical heat recovery and a working method, the system includes an evaporator, a first compressor, a condenser, a first expansion valve, a gas-liquid separator, a mixer, Regenerator and mechanical heat recovery components, the working method has four processes: evaporator low-pressure evaporation process, compressor compression process, condenser high-pressure condensation process and mechanical heat recovery process. Compared with the prior art, the present invention further reduces the temperature of the solution before the expansion valve while recovering heat by adding mechanical heat recovery after the solution heat exchanger, and the high-temperature heat released by the mechanical heat recovery can be used to preheat the high temperature on the side of the condenser The fluid, through two-stage heat recovery, can not only reduce the temperature of the solution in front of the expansion valve, thereby reducing the irreversible loss in the throttling process, but also improve the cycle heating capacity and heating energy efficiency, and the cycle energy efficiency can be increased by about 10‑20%.

Description

technical field [0001] The invention relates to the field of refrigeration / heat pump technology, in particular to a mixed working medium compression cycle system with mechanical heat recovery and a working method. Background technique [0002] With the rapid development of the global economy and the increasingly severe energy crisis and environmental pollution, it is urgent to develop efficient and clean cooling / heating technologies. As a new way of heat extraction, heat pumps have attracted widespread attention due to their advantages such as high energy efficiency and simple structural features. At present, the more mature refrigeration / heat pump technology is vapor compression refrigeration / heat pump technology. [0003] figure 1 Shown is a schematic diagram of the existing mechanical vapor compression cycle. During operation, the low-temperature and low-pressure liquid refrigerant evaporates and absorbs heat in the evaporator. The heat comes from the environment or ind...

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Problems solved by technology

For the mechanical vapor compression cycle, currently limited by factors such as refrigerant, cycle, and components, the energy efficiency of the system is limited to a certain extent. For example, the energy efficiency of a household air-conditioning system is less than 4

In order to improve cycle efficiency, the applicant previously proposed a mixed working medium compression cycle with liquid pressurization, such as figure 2 As shown, the analysis shows that the energy efficiency of this cycle is about 4.5 under typical heating conditions in winter, and the improvement is limited

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