Research On The Application Of Low Temperature Air Source Heat Pump Heating System In Residential Area In North China

In order to improve China’s energy consumption and environmental pollution issues,China’s Energy Administration has put forward new requirements for the winter heating method in the northern region,and formulated guidelines and policies for clean heating.Therefore,the provinces and cities in the north have strictly reduced the proportion of heating coal and increased the proportion of clean energy,especially renewable energy heating;and formulated the energy saving and emission reduction plan of "coal to electricity,electricity heating".Due to its outstanding advantages of high efficiency and energy saving,stable operation under low temperature conditions and clean and pollution-free,the low-temperature air source heat pump heating system is widely used in residential heating,which is crucial for improving the smog environment in the northern region and energy saving and emission reduction important role.In this paper,an experimental study and a TRNSYS simulation study are conducted on a low-temperature air source heating system used by a residential building in Tai’an in winter.First of all,according to the heating demand of the residential building in the experimental site,the heating system equipment was selected,and the heating system using the low-temperature air source heat pump as the heat source was established and operated.The operation data of the system equipment in a heating season was recorded,and the data was compiled to obtain low-temperature air The operating characteristics of the source heat pump heating system in the northern region.Secondly,the TRNSYS simulation software was used to model the above experimental items,and the simulation results were compared with the experimental results to verify the reliability of TRNSYS simulation modeling;and through analysis of the simulation results,it was found that the heating system had drawbacks in the control scheme.Finally,an optimized control scheme for controlling the return water temperature according to the outdoor temperature is proposed.Based on the TRNSYS model,the operating characteristics of the low-temperature air source heat pump heating system under the control of the optimized control scheme are simulated,and the energy saving of the optimized scheme is analyzed To find out the best operation control strategy for low temperature air source heat pump heating system.Through experimental research,it is concluded that the low-temperature air source heat pump heating system is stable in the northern region;the average heating capacity that the unit can provide under the conditions of typical day 1 to typical day 3 are: 128.1 kW,163.1 kW,and 71 kW;The average heating performance coefficient cop reached 3.02,2.72 and 3.24,respectively;the changes in heating capacity and cop were opposite to the outdoor temperature.According to TRNSYS simulation study: under the design conditions(average outdoor temperature-6.7 ℃),the heating index of the residential building is 29.7W / m2;the average monthly cop of the low-temperature air source heat pump unit is as high as 3.01 in the coldest month;Outdoor temperature is one of the important factors affecting the energy consumption of low-temperature air source heat pump heating system.Controlling the operation of the unit according to the outdoor temperature can greatly reduce energy consumption;When running under the control strategy of the best optimized control scheme,the heating capacity provided by the unit in the coldest month increases,with an average monthly cop value of 3.32;the power consumption of the entire heating season saves 15.72 compared with the ordinary variable return water temperature control strategy MW · h electricity can reduce the consumption of standard coal by 1934.17 kg.After researching in this paper,it can be concluded that the residential areas in northern areas can use low-temperature air source heat pump heating system widely.And the operation of the low-temperature air source heat pump heating system is controlled according to the outdoor temperature,which has better heating effect,higher heating efficiency and more energy saving Conclusion.This article provides a reference for the feasibility study of the air source heat pump heating system in the northern cold regions,and contributes to reducing the pressure of energy consumption and environmental pressure in China.