Off-peak electricity heat storage cascaded heat pump heat supply system and modes

Abstract

The invention relates to the technical field of off-peak electricity utilization and heat pump heat supply, in particular to an off-peak electricity heat storage cascaded heat pump heat supply systemand modes. The heat supply system comprises an off-peak electricity heat storage device, a generator, an absorber, a condenser, an evaporator, a compressor, a gas-liquid separator and a user heat supply device, wherein the off-peak electricity heat storage device is connected with the generator, and a heat medium circulates between the off-peak electricity heat storage device and the generator through a high-temperature circulating pump. According to the system, the gas-liquid separator is arranged to realize a double-stage cascaded cycle including a vapor compression heating cycle and an absorption heating cycle, so that heat transfer loss between two-stage heat pumps is reduced, the heating efficiency of the system is improved, and the system structure is more compact; and meanwhile, theinvention provides a plurality of heat supply modes, flexible switching between a single-stage heating cycle and a double-stage cascaded heating cycle over the periods before, during and after heating, during an off-peak electricity period and during a non-off-peak electricity period, and match between supplied heat and the heating load is facilitated.

Description

technical field [0001] The invention relates to the technical field of off-peak electricity utilization and heat pump heat supply, in particular to a low-valley electric heat storage cascade heat pump heat supply system and its method. Background technique [0002] With the improvement of living standards and the continuous expansion of urban housing area, the demand for building heating energy consumption is also increasing. Among them, the energy consumption of building heating in cold northern regions accounts for 50% of the total energy consumption of buildings. Clean heating methods have caused serious smog problems. At the same time, the demand for heating in hot summer and cold winter areas such as the middle and lower reaches of the Yangtze River is increasing. In addition, with the series of policies such as "limiting coal" and "coal to electricity" for winter heating in northern my country The introduction and implementation of "peak and valley" electricity price reg...

AI Technical Summary

Problems solved by technology

Electric energy is clean and high-grade energy. Although low-valley electric thermal storage heating technology has good economics, it cannot give full play to the high-grade characteristics of electric energy. There are usually problems such as poor low-temperature heating capacity, low energy utilization rate, and heavy pollution.

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