Air source heat pump electric thermal storage system and control method

Abstract

The invention discloses an air source heat pump electric thermal storage system and a control method. The system comprises at least one air source heat pump, at least one integrated electric thermal storage device, a plate type heat exchanger, a primary side water pump, a secondary side water pump, a circulating pipeline, cables and a control system, wherein the primary side water pump and the secondary side water pump are distributed on the two sides of the plate type heat exchanger, the circulating pipeline interconnects water flow of equipment and supplies heat to a terminal, the cables areused for supplying power to the equipment in the system, and the control system controls the operational process of the whole system; the integrated electric thermal storage devices integrate an electric heating device and a thermal storage device into integrated equipment, at least one of the air source heat pumps is a high-temperature air source heat pump, and the control system controls the air source heat pump electric thermal storage system to flexibly switch among a plurality of different operational modes. The system has the advantages that through the integrated electric thermal storage devices, the configuration number of the heat pumps is decreased, the system is simplified, the initial investment of the equipment is lowered, the reliability of the system is enhanced, in addition, clean energy is reasonably utilized, the occupied area of the system is small, the system efficiency is high, furthermore, the off-peak electricity can be fully utilized, and the operation cost islow.

Description

technical field [0001] The invention relates to the technical field of heating, in particular to an air source heat pump electric heat storage system and a control method. Background technique [0002] Air source heat pump heating and thermal storage heating are currently the two most widely used electric heating methods. The cost of air source heat pumps is high, and it takes up a large outdoor space, causing noise pollution, and when the ambient temperature is low, the heat efficiency of air source heat pumps is low, or it cannot operate due to frosting on the outdoor evaporator. These defects affect the air quality. Promotion of source heat pumps. Electric thermal storage heating is not affected by the ambient temperature, but because the heat stored during the off-peak period needs to be used throughout the day, the electric power load is relatively large, and the current low-valley electricity prices in various provinces and cities are not cheap enough, so the heating ...

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Problems solved by technology

[0006] The purpose of the present invention is to provide an air source heat pump electric heat storage system and its control method, which solves the problem that the existing air source heat pump combined with electric heat storage system cannot use water heat storage or heat storage due to the low temperature of the heat pump outlet water. The hot water tank is too large, the efficiency of the heat storage heat pump is reduced during heating, the system is complicated after the electric boiler and the heat storage device are separated, and the floor area is large, etc., and the equipment matching principle and guarantee for the high temperature air source heat pump heat storage system are provided The control method under the operating principle of the lowest heating quality and operating cost at the end load

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