Experimental Study On Single Building Of Solar Heating System In Northwest China

Energy is the foundation of social development and economic construction.The development of new countryside is inseparable from the support of energy.With the rapid growth of population and rapid economic development,thus energy consumption is inevitably being aggravated,leading to energy crisis.Solar energy as a clean renewable energy source,it attracts more and more people,solar heating technology is continuously popularized.In Northwest China is abundant in solar energy resources,the solar heating system is m ore favorable than the traditional heating system,however,the outdoor environmental temperature is low in the Northwest of China,the heat is unsustainable in solar heating systems,which affects the indoor thermal environment of the building,the main objective of this work is to maximize the use of heat in solar heating systems,increase the utilization of heat in solar heating systems,reduce resource waste and improve indoor comfort,and to find a reasonable optimization method,this paper combines the climate characteristics of the Northwest region,In order to achieve this goal a solar heating system was built and tested in a single building in Minqin County of Gansu Province in China,in this work solar low temperature floor radiant heating and radiant heating are compared and analyzed,the advantages of solar low temperature floor radiant heating are pointed out,and the thermal performance of the solar low-temperature floor radiant heating system is analyzed.The conclusions of this study are as follows:(1)Through the comparison and analysis of low temperature floor radiant heating and radiator heating,it is found that the indoor thermal environment of low temperature floor radiant heating is superior the indoor thermal environment of the radiator heating,the temperature of the low temperature floor radiation heating room is higher than the radiator heating,the low temperature floor radiant heating system has the highest indoor temperature of 0.1m from the ground,the vertical temperature distribution in the indoor heating room is uniform and the indoor vertical temperature is vertical,the vertical temperature rate of change is insignificant,the indoor maximum vertical temperature difference is 0.4 ?,and there is no stratification phenomenon in the over all temperature distribution,the indoor temperature distribution of the radiator heating is the opposite,the temperature is the lowest at the ground 0.1m,the indoor temperature rises higher,the highest temperature is at 2m,the maximum temperature diffe rence is 4.4?,the indoor temperature distribution appears obvious stratification phenomenon.Through the exergy analysis of the low temperature floor radiation heating and the radiator heating,the results show that the mining is used.The exergy efficienc y of low floor radiant heating is 50.85%,the exergy efficiency of the radiator heating is31.27%,the low temperature floor radiation heating exergy efficiency is 19.58% higher than that of the radiator heating,therefore,the low temperature floor radiation heating efficiency is higher,the solar energy utilization ratio is greater,and the indoor comfort is better.(2)Through the analysis of the thermal performance of the low temperature floor radiant heating system,it is found that during the heating per iod,the heat supply of the system can completely satisfy the heat consumption of the building during the heating period,but there is a problem of excessive heating in the early heating and the high temperature in the room.(3)Analysis the heat after the heating,by taking the heat storage tank as a research object,and recording the measurements starting at 00:00 to 08:00 at night,the performance of the heat storage tank is analyzed within the prementioned,the results show that the heat loss of the heat storage tank is affected by the average ambient temperature and the outdoor wind speed,fitting to keep the other conditions constant,the total heat loss of the storage tank is affected by a single factor: The heat storage tank will increase by 0.68 MJ wh en the average ambient temperature is reduced by 1?,the total heat loss of the storage tank will increase by 0.04 MJ when the outdoor wind speed is increased by 1m/s.(4)In order to reduce the heat loss of the system and improve the utilization of heat,the optimal control strategy and localization suggestions for the water tank are proposed,the potential analysis of the economic benefit after the optimization is carried out,the heating capacity of the low temperature floor radiant heating system is increased from 15515.5MJ to the 28906.4MJ,the conversion into standard coal is 3083.0kg,the energy consumption of the heating circulation pump is 144.0k W·h,it is converted into standard coal for 58.2kg,after optimization the coal saving is 3024.8kg,the cost saving is 4537.2 yuan,the static recovery period of the system is 3.4 years,then the emission reduction of CO 2 is 7683.0kg,and the economic benefit is remarkable.The innovation of this article:Based on the comparative analysis of the effect of low-temperature floor heating and radiator heating,and the analysis of the thermal performance of the solar low-temperature floor heating system,the following two optimization suggestions are proposed.At the same time,which forecasts and analyzes the optimized system economy.(1)In view of the problem of heat loss in the hot water storage tank,thesuggestion that the heat storage tank is installed in the room is proposed,the heat loss of the storage tank is converted into effective use of heat,the auxiliary heating of the storage tank is used to increase the indoor temperature,thus improving the use of heat energy.(2)The proposed temperature control using the temperature controller proposed measures not only to maintain the indoor temperature within a sui table temperature range,but also extended heating time,and further improve the efficiency of the system.