Abstract
This paper proposes the application of time and spatial partition heating to a solar water heating system. The heating effect and system performance were analyzed under the continuous and whole space heating and time and spatial partition heating using TRNSYS. The results were validated by comparing with the test results of the demonstration building. Compared to continuous and whole space heating, the use of time and spatial partition heating increases the solar fraction by 16.5%, reduces the auxiliary heating by 7390 MJ, and reduces the annual operation cost by 2010 RMB. Under time and spatial partition heating, optimization analyses were conducted for the two system capacity parameters of the solar collector area and tank volume and the one operation parameter of auxiliary heater setting outlet temperature. The results showed that a reasonable choice of the solar collector area can reduce the dynamic annual cost, the increased tank volume is advantageous to heat storage, and the auxiliary heater setting outlet temperature have greater influence on the indoor heating effect. The advanced opening of solar water heating system and the normal opening of passive air vents are recommended. Based on the comparison of the two modes, the time and spatial partition heating technology is a better choice for rural dwellings.
Highlights
With the increasing rate of urbanization in China, the requirements for indoor thermal environment have improved with the gradual improvement in resident living standards [1,2].As a result, the energy consumed in rural buildings accounts for more than half of the total building energy consumption in recent years [3], in which the heating energy consumption accounted for a majority proportion
Marcos et al [20] analyzed the thermal performances of solar water heating system (SWHS) of plate solar collector by experiment, and the results showed that the solar facility was able to meet 55% of the space heating demand
This paper proposes the application of a time and spatial partition heating (TSPH) to a SWHS
Summary
With the increasing rate of urbanization in China, the requirements for indoor thermal environment have improved with the gradual improvement in resident living standards [1,2].As a result, the energy consumed in rural buildings accounts for more than half of the total building energy consumption in recent years [3], in which the heating energy consumption accounted for a majority proportion. Most areas in Northwest China have abundant solar energy and possess solar heating conditions. Solar heating should be the priority development direction of building heating and energy saving. Many researchers have studied the solar water heating system (SWHS) and focused mainly on aspects such as system optimization, operation control analysis, and system evaluation [4,5,6]. The research of system optimization mainly includes the unit design parameters of different types of collectors [7,8,9], water tanks [10,11,12], heat exchangers [13,14], and system operating parameters [15,16,17]
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