Forced circulation and indirect heat exchange type solar water heating system and control method thereof

Abstract

The invention relates to a forced circulation and indirect heat exchange type solar water heating system and a control method thereof. The solar water heating system comprises a system master control device, a circulating heat collection loop, a heat collection branch and a household heat exchange control system consisting of a household water tank, a circulating branch pipe, an angular stroke electric control valve, a flowmeter and a household sub-control device, wherein the household sub-control device is electrically connected with the system master control device; and a plurality of temperature sensors are arranged in the solar water heating system. A solar heat collector group is provided with an automatic solar heat collector cleaning device which is automatically controlled by the system master control device. The control method is that: the system monitors the temperature and flow of the household water tank in real time and automatically adjusts the opening of the angular stroke electric control valve to regulate the heat flow supplied to the household water tank so as to realize differential supply of solar heat; and reasonable temperature and water using amount are determined through season selection and the number of users, so that whether an auxiliary heat source is started is determined, the control is humanized and intelligent and energy is saved.

Description

technical field [0001] The invention relates to a solar water heating system, in particular to a forced circulation and indirect heat exchange solar water heating system capable of automatically adjusting heat distribution, improving light and heat utilization efficiency, enhancing heat storage capacity, and prolonging the service life of solar heat collectors and its control methods. Background technique [0002] At present, there are many types of solar water heating systems used in residential buildings. From the perspective of actual application, the system structure and control method of solar water heating systems used in residential buildings with relatively low floors are relatively simple and easy to implement. Efficient use of solar energy. With the gradual development of middle and high-rise residential buildings to become the main form of urban new residential buildings, it is necessary to continue to increase the scale of application of solar water heating syst...

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly solves the problem that the original solar water heating system can only relatively evenly distribute solar heat to the individual water tanks of each household, and cannot perform differentiated operation according to different parameters and states of the water tanks at the user end, thus causing unnecessary solar heat Loss, heat transfer can not be targeted, solar energy can not be maximized utilization of technical problems; at the same time solve the problem that because solar collectors are usually placed on the roof layer, it is easy to form a dust layer or be covered by other foreign matter on the surface of the glass vacuum tube, which will cause Seriously affect the absorption capacity of vacuum tube collectors for solar radiation, directly reduce the photothermal efficiency of solar energy, and it is very difficult to manually clean the solar collectors, which is very time-consuming and laborious, and there is a lot of insecurity Technical problem: provide a forced circulation and indirect heat exchange solar water heating system and its control method, which can automatically control the size of the heating flow according to the different temperatures of the water tanks at the user end and the water flow, so that the limited amount of solar heat collected can be Targeted priority is given to users with large hot water demand, forming a gradient and differentiated supply of heat, which not only avoids ineffective loss of heat, but also makes the use of hot water at the user end more comfortable and humanized, effectively reducing solar heat loss, so that the solar energy can be maximized

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