| As an important part of energy consumption,building energy consumption has attracted much attention.Capillary radiant heating system has been favored by many people for its comfort,indoor space and low return water temperature.In this paper,capillary radiant heating system based on air source heat pump,combined with the rules and characteristics of building energy and outdoor meteorological parameters,has been carried out to study the adaptability of the capillary radiant heating system based on air source heat pump and the heating modes of building.Taking a typical three courtyard in Beijing as the research object,the model of air source heat pump with capillary radiant heating system based on TRNSYS is established.Then the paper analyses the thermal environment and energy consumption of building under six different heating modes:continuous heating mode under design conditions,intermittent heating mode under design condition,heat pump continuous heating mode without heat storage tank,heat pump intermittent heating mode without heat storage tank,continuous heating mode of heat pump with heat storage tank and heat pump intermittent heating mode with heat storage tank.Firstly,the indoor vertical temperature and comfort of different rooms with capillary ceiling radiant heating system in different heating modes were simulated by Airpak,and the indoor thermal environment in different modes and time was summarized and analyzed.Based on TRNSYS,the model of air source heat pump with capillary radiant heating system is established.The indoor hourly temperature,load,heat pump performance,running time,energy consumption and environmental benefits in different heating modes are studied.The results show that intermittent heating may lead to indoor temperature fluctuations,but the indoor temperature meets the requirement can reach more than 87% when the room is occupied.Therefore,the intermittent heating with capillary can basically meet the needs of indoor thermal comfort.In addition,due to intermittent heating,in order to meet the requirement of comfort when people enter the room,it is necessary to increase the heat pump capacity appropriately.Through the study of the system operation performance of the whole heating season,it is shown that the running time of heat pump continuous heating mode without heat storage tank is the longest,which is 2702 hours,and the running time of heat pump intermittent heating mode with heat storage tank is the shortest,which is 1737 hours.Under the heat storage tank condition,the seasonal energy consumption of the heat pump is the lowest when the heat charge temperature is 50 degrees.In the 6 heating modes,the intermittent heating system with heat storage tank has the lowest total energy consumption,and the benefits of energy saving and environmental protection are significant.The operation of air source heat pump with capillary radiation heating system in Beijing,Lanzhou,Xi'an,Shenyang,Chengdu and Shanghai is studied.It shows that heat consumption in intermittent heating mode can save more than 8% of that in continuous heating mode.The total energy consumption of the system decreases with the increase of outdoor temperature in different cities.The intermittent heating mode with heat storage tank has significant energy saving and environmental benefits in different cities,and the northern buildings have greater energy saving space.When using heat pump intermittent heating mode with heat storage tank,even in Shenyang,the season COP of heat pump can still reach 2.53.It indicates that in the cold area,using heat charge during the daytime can effectively improve the performance of heat pump.The research work can provide important theoretical support for the heating and energy saving of residential buildings in the north of China and the promotion of air source heat pump in the cold and cold regions of China.It will provide technical reserves and support for the implementation of the work of coal to electricity in northern China,and contribute to building energy efficiency in China. |
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