Optimization method for collector installation of solar heating system based on effective heat collection

Abstract

The invention discloses a solar heating system heat collector installation optimization method based on the effective heat collecting capacity. The method comprises the following steps that 1, the effective heat collecting capacity of a solar heating system is determined, 2, an installation optimization model of a solar heating system heat collector is set up and 3, a mathematical model is optimized. The best installation direction and dip angle of the solar heat collector are obtained on the basis of the effective heat collecting capacity so that excessive invalid solar radiation received by a heat collecting face can be eliminated, and the determined solar heat collector is more precisely installed.

Description

technical field [0001] The invention relates to the technical field of solar energy utilization, in particular to a method for optimizing the installation of heat collectors in solar heating systems based on effective heat collection. Background technique [0002] With the continuous development of active solar products, the application of solar water heating and active solar heating technology in buildings has gradually become the focus of research. The irradiance of solar radiation reaching the earth's surface varies greatly. Even at the same location, the amount of solar radiation obtained on different inclined surfaces is also very different. Therefore, it is important to accurately select the installation inclination angle and installation azimuth of the solar collector. An important measure to maximize the use of solar energy resources. [0003] For the optimal installation orientation and inclination angle, many studies have given different results. Such as literatu...

AI Technical Summary

Problems solved by technology

[0005] It can be seen that traditional research only makes optimization recommendations based on the amount of radiation received by the collector surface, without considering the influence of ambient temperature and working fluid temperature on the heat absorbed by the collector

In practical applications, since the heat collection efficiency of the solar thermal heating system is not only affected by the radiation intensity, but also related to the dry bulb temperature of the outdoor ambient air, when the outdoor air temperature is low and the solar radiation intensity is weak, the convection on the surface of the collector The heat dissipation loss caused by heat exchange is greater than the radiant heat gain between the collector surface and the sun, so at sunrise and sunset when the temperature and solar radiation intensity are low, although the collector surface can receive solar radiation energy, it cannot Heating the hot water in the collector, which makes the solar radiation ineffective for nearly 2 hours a day, especially in some cloudy and snowy weather periods, such as figure 1 shown

After using the hourly meteorological data of a typical meteorological year to simulate and calculate the working conditions of the whole year, the heat collected per unit area of ​​the collector can be obtained, as shown in figure 2 As shown, it can be clearly seen from the figure that although there is solar radiation in many time periods throughout the year, the collector cannot obtain effective heat for heating the liquid working medium in it.

[0006] It can be seen that only the radiation received by the collector surface is used for optimization, and the invalid solar radiation received by the collector will be included, resulting in a certain deviation between the obtained optimization results and the actual

Images