Transcritical CO2 air source system adopting phase change energy storage

Abstract

The invention provides a transcritical CO2 air source system adopting phase change energy storage. The transcritical CO2 air source system comprises a compressor, a first heat storage module, a throttling device, a second heat storage module and a cold storage module. The first heat storage module comprises a gas cooler and a first heat storage device arranged in series; the second heat storage module comprises an evaporator, a fan and a second heat storage device, and the second heat storage device is connected to the evaporator in series through the throttling device. The transcritical CO2 air source system comprises an energy storage operating module and a normal heating model. In the energy storage operating mode, the first heat storage device and the second heat storage device storesheat and a regenerator stores cold; in the normal heating mode, a water source cooled by a cold storage module, treated by the gas cooler and heated by the first heat storage device successively is fed to a user end. The system combines the phase change energy storage technique with the heat pump technique, solves the problem that the peak load of a power grid is excessive when the heat pump operates, and achieves a purpose of peak-load shifting is achieved by using off-peak electricity.

Description

technical field [0001] The invention relates to the technical field of heat pump systems, in particular to a transcritical CO 2 Air source system. Background technique [0002] As an energy-saving and environmentally friendly heating method, transcritical CO 2 The development and research of air source heat pump technology has attracted much attention. During the operation of the system, the refrigerant in the air cooler is in a supercritical state, and the temperature and pressure are independent parameters. During the entire heat release process, the temperature glide characteristics of the refrigerant side match the temperature rise process of the water temperature, reducing It guarantees the irreversibility of the heat exchange process, so it is especially suitable for making hot water. transcritical CO 2 There are some shortcomings in the operation of the air source heat pump hot water system: the inlet temperature of the water side has a great influence on the syst...

AI Technical Summary

Problems solved by technology

transcritical CO 2 There are some deficiencies in the operation of the air source heat pump hot water system: the inlet temperature of the water side has a great influence on the system performance

However, the following problems exist in phase change materials at this stage: the degradation of thermophysical properties during the cycle; the leakage of phase change materials from the matrix; the effect of phase change materials on matrix materials

Heat storage or cold storage can greatly reduce operating costs under low-load demand conditions. The performance of air source heat pumps affects the energy storage effect, and the energy-saving effect is limited.

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