Applicability Analysis of Solar District Heating in North Rural Areas

Abstract

Coal is still the main energy of space heating in North rural areas in China, and coal stove, coal fired boiler are most common heating technology through literature analysis of North rural areas heating status. With the development of clean energy heating in rural areas, solar heating gets people’s attention. In 2016, through investigating 15 solar heating projects in North rural areas, we find that all rural solar heating is household heating, due to factors such as collector installation, heat storage technology, operation and maintenance, solar household heating has not been accepted by rural residents. But large scale solar assisted ground source heat pump district heating technology (SAGSHP) is popularized, one successful case is Xiaowangjiapu village project, we measured operation factors of this system, including indoor air temperature, relative humidity, heating demand etc. And setting up software simulation model by using TRNSYS 18.0. Taking the measured outdoor meteorological parameters and heating demand as software input parameters, by contrast to model output parameters of heat pump and test data, checking the software model. And then analyze the performance of the system for the whole year. Simulation results show that average storage temperature of soil decreases from 12.80°C to 12.54 °C, solar fraction (SF) is just 17.6%. Based on the experience of European cases, the reason for small SF is no preheat of soil and loss of soil heat dissipation.