Water-saving type solar energy hot-water supply system

Abstract

The invention discloses a water-saving type solar energy hot-water supply system. The water-saving type solar energy hot-water supply system comprises a solar heat collecting system, a hot water pipeline and a temperature adjusting unit, wherein the solar heat collecting system comprises a solar heat collector and a water storage tank; the hot water pipeline is formed by arranging a plurality of branch pipelines into a total pipeline in a sleeving manner, and water outlet ends of the branch pipelines are accessed to corresponding individual users for supplying hot water to the users; the temperature adjusting unit comprises a cold water tank, a cold water inlet pipe, a cold water outlet pipe and a warm water tank, a water inlet of the cold water tank is communicated with the branch pipelines, a first water inlet of the warm water tank is further communicated with the branch pipelines, a second water inlet of the warm water tank is communicated with a water outlet of the cold water tank through a cold water pipe, so that the cold water tank and the warm water tank form a liquid communicated pipeline, lower-temperature water in the branch pipelines can be pre-stored in the cold water tank, and the pre-stored cold water is utilized for temperature adjustment in the hot water supply process.

Description

technical field [0001] The invention relates to the technical field of solar energy, and more specifically, the invention relates to a water-saving solar hot water supply system. Background technique [0002] my country is rich in solar energy resources, and the total annual solar radiation of more than two-thirds of the country's land area exceeds 3340-8360MJ / m 2 , the annual average sunshine hours are more than 2200 hours. At present, my country's energy-saving market is mainly concentrated in the fields of industry and construction, and the integrated technology of solar energy and buildings has become one of the commonly used building energy-saving technologies. [0003] A conventional solar water heating system includes a solar heat collection water supply and return system and a user terminal water supply and return system. The branch pipelines entering each user terminal are respectively connected to the large-diameter main pipeline connected with the solar water sto...

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Problems solved by technology

[0003] A conventional solar water heating system includes a solar heat collection water supply and return system and a user terminal water supply and return system. The branch pipelines entering each user terminal are respectively connected to the large-diameter main pipeline connected with the solar water storage heater, and the main pipeline is carried out. Shared, and in order to ensure that hot water can quickly enter the user, the hot water circulates continuously in the solar heat collection water supply and return system. Due to the heat dissipation of the pipeline during the circulation process, it causes a huge heat loss, especially in winter in the north, the ambient temperature Very low, pipe heat dissipation is greater, reaching more than 80%

[0004] Another solution is to cancel the hot water circulation loop, temporarily store the hot water in the pipeline, and insulate the pipeline to keep it at a certain temperature. Although this reduces the heat dissipation rate in the hot water circulation, the When the ambient temperature is low, the heat preservation effect of the hot water in the pipeline is not ideal. When the retention time is long, the water temperature is often low. Therefore, when the user uses hot water, it is generally necessary to keep the temperature of this part of the pipeline low. The low water is released, waiting for the hot water in the water storage tank to arrive, resulting in a waste of water resources

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