Energy gradient utilization multi-energy complementary heat supply system and heat supply method

Abstract

The invention discloses an energy gradient utilization multi-energy complementary heat supply system and a heat supply method. The heat supply system comprises a heat pump (2), a low-temperature heater (6), a high-temperature heater (5), a heat user (4), a circulation pump (9) and a circulation pipeline (11), wherein the heat pump (2) comprises a heat pump evaporator (1) and a heat pump condenser(3), an outlet / inlet at the low-temperature side of the heat pump condenser (3) is connected with the circulation pipeline (11), and the circulation pipeline (11) is sequentially provided with the circulation pump (9), the low-temperature heater (6), the high-temperature heater (5) and the heat user (4) in the flowing direction of a medium in the pipeline. According to the energy gradient utilization multi-energy complementary heat supply system and the heat supply method, under the condition that the same heat supply requirement is met, low-quality energy can be fully utilized, and the optimal utilization of high-quality energy can be realized.

Description

technical field [0001] The invention belongs to the field of heating systems, in particular to the technical field of multi-energy complementary heating systems. Specifically, the invention relates to a multi-energy complementary heating system and a heating method for cascaded utilization of energy. Background technique [0002] The water supply temperature of many heating systems is relatively high, but the return water or make-up water temperature of the heating system is low. Traditional heating systems use high-quality energy to directly heat the supply water to the required high temperature, which will increase the irreversible loss of heat transfer and cause Waste of energy quality. [0003] A heat pump can use high-quality electric energy to drive a thermal cycle to improve the quality of low-quality energy. However, the heat pump heating coefficient of performance (energy efficiency ratio COP) is affected by the temperature difference between high and low temperatur...

AI Technical Summary

Problems solved by technology

[0005] In addition, the demand for heating load is changeable, and the amount and quality of available external heat sources are also mostly unstable. The heat source and the demand for heating load are often not completely matched at a certain time. If the situation adjusts different heat intake in time, it will often increase the supplementary heat of high-quality heat source, which will increase the degraded use of high-quality heat.

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