Multi- water tanks solar energy-heat pump composite hot-water system and its operation control method

Abstract

The invention relates to a multiple water tank solar-heat pump composite hot water system and a control method thereof. The system is provided with two to five parallel hot water storage tanks; an electromagnetic valve is arranged on a water supply / return main pipe of each hot water storage tank; an electromagnetic valve is also arranged on a water inlet / outlet branch pipe; the bottom of each hot water storage tank is provided with a temperature sensor; a hot water connecting pipe enters from the bottom of each hot water storage tank and comes out from the upper part of the hot water storage tank; the hot water storage tanks are connected in series by the hot water connecting pipes. A water supply / return pipe of a solar heat collector near one end of a cold water inlet is connected with the water supply / return main pipe of the parallel hot water storage tank; a supply / return water pipe of a heat pump in the other end of the water inlet is connected with the water supply / return main pipe of the parallel hot water storage tank. The system is provided with heat charge by the heat pump, solar energy and combination of the solar energy and the heat pump; according to the weather condition, the multiple water tank-heat pump composite hot water system automatically selects a heating mode, makes full use of solar energy and off-peak electricity and has the advantages of flexible control, low operating cost, etc.

Description

technical field [0001] The invention relates to the technical field of solar heat utilization, in particular to a multi-tank solar energy and heat pump composite hot water system and an operation control method thereof. Background technique [0002] With the rapid development of my country's economy, the problem of energy shortage is becoming more and more obvious. At the same time, with the improvement of people's living standards, the consumption of domestic hot water is also increasing rapidly. How to reduce the consumption of non-renewable energy without affecting people's quality of life has become a social concern. As a green renewable energy source, solar energy has been widely used in domestic hot water supply. Since the solar radiation varies day and night and is greatly affected by weather conditions, a heat storage tank and an auxiliary heat source are almost necessary components. At present, many solar water heating systems use electric heating as an auxiliary...

AI Technical Summary

Problems solved by technology

Existing heat pump and solar hybrid systems generally use single water tanks for heat storage or double water tanks (one water tank for heat storage and the other water tank for heat supply). It is difficult to match and coordinate well, which often leads to a significant reduction in the efficiency of solar collectors, and the effective heat collected is very little, resulting in the system mainly relying on heat pump heating; when using double water tanks, the heating power of the heat pump must be relatively large to meet the needs, and it is difficult to fully utilize Thermal storage of low-peak power at night will put pressure on the peak power load of the public grid

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