Application Of Unitary Ground Source Heat Pump In Rural Areas Of Northern Anhui

With the rapid development of my country’s economy,the people’s living standards have improved significantly.Rural residents are no longer satisfied with the existing living environment,and their requirements for indoor thermal comfort are increasing day by day.At present,small coal-fired boilers are still the main method of heating in rural areas in northern Anhui in winter,which use non-renewable fossil energy such as coal to provide the heat needed in winter.However,in today’s society,coal resources are extremely scarce,and the efficiency of burning coal is low,and a series of polluting gases harmful to the environment will be produced,which is contrary to the concept of green and sustainable development in today’s society.At the same time,it has also increased the difficulty of "carbon peaking" and "carbon neutrality".Therefore,it is imperative to continue to find a clean heating technology to replace the traditional coal-fired boiler.Shallow geothermal energy has the advantages of large reserves and renewable energy.Combined with heat pump technology,it can achieve high efficiency and energy saving,which provides the possibility for the application of unitary ground source heat pump systems in rural areas in northern Anhui.In recent years,although the unit ground source heat pump system suitable for small buildings has been developed,it is restricted by various conditions in rural areas and lacks actual operating data,making it difficult to analyze its actual operating conditions in rural areas.This article takes the rural areas of northern Anhui as the research object,investigates the characteristics of buildings and personnel in northern Anhui,adopts a questionnaire survey method,and conducts data analysis.Then,a typical residential building model in rural areas in northern Anhui was established by collecting data and empirical research,and using the Design Builder dynamic building energy simulation software to analyze its annual energy consumption,and the ratio of total cold to total heat was 1.22:1.Combining the principles of the ground source heat pump system,a double-sided buried tube unit ground source heat pump test system platform was created.While monitoring the actual operation of the system,the actual heat exchange capacity of different buried tube heat exchanges in rural areas in northern Anhui was compared.Draw the following conclusions by running the test platform:1.Through monitoring data and theoretical analysis,the measured value and theoretical value of the initial ground temperature of the underground soil in rural areas of northern Anhui are obtained,the error is only 1%,and the correctness of the initial ground temperature calculation formula is verified;the actual operation of the cooling and heating seasons,Under the same conditions,only by changing the type of underground heat exchanger,the cooling/heating coefficient of the heat pump unit under the form of De25 double U underground heat exchanger can be higher than that of De32 single U underground heat exchanger;and Under the above conditions,the actual heat exchange capacity of the De25 double U underground heat exchanger is 13%higher than that of the De32 single U underground heat exchanger,and the energy efficiency coefficient is increased by about 50%.The heat exchange per well depth is double U-shaped.Higher,when the investment cost is basically the same,the operation effect of the double U-shaped buried pipe unit ground source heat pump system is stronger2.The unit ground source heat pump system consumes electricity at the cost.Although it does not directly generate harmful gases,my country’s power generation is still mainly in the form of coal-fired power generation,which indirectly leads to the emission of harmful gases and destroys the ecological environment.This paper compares the three heating forms of unitary ground source heat pump system,small coal-fired boiler system,and air source heat pump system,and analyzes their economy,energy saving and ability to promote "carbon neutrality".The results show that although the initial investment of the selected unitary ground source heat pump system is high,the operating cost is low,and the payback period is only 3.5 years and 2.6 years;the unitary ground source heat pump system has a complete heating cycle in rural areas in northern Anhui,and the heating area is per unit.The standard amount of coal used is 5.31kgce/(m2·a),which reduces 14.69 kgce/(m2 · a)compared with coal-fired boilers,and the energy saving rate is as high as 73.45%.Compared with the air source heat pump system,it can reduce 3.71 kgce/(m2)· a),the energy-saving rate is 41.13%;compared with the other two systems,the unitary ground-source heat pump can reduce harmful gas emissions by 4.3259t/a and 1.0963t/a,corresponding to saving treatment costs 535.16 RMB/a,135.12 RMB/a.3.In order to achieve the goal of "carbon neutrality",to achieve "zero emissions".Calculate the greenhouse gas emissions of the above three forms in the complete heating season as 1.523t/a,5.736t/a,2.59t/a,respectively.After querying data and calculating,the average household in rural areas in northern Anhui has arable land and woodland.The respiration of maize and forest trees is used to fix carbon to offset the amount of CO2 emitted.Its capacity is 4.91t/a and 16.91t/a respectively.The results show that the unitary ground-source heat pump system has the least pressure on the environment and can achieve the effect of carbon balance.It is planned to use "clean energy" to produce "clean electricity" to achieve the goal of self-sufficiency.This paper selects the abundant biomass energy in rural areas for biogas power generation technology and photovoltaic power generation technology and conducts theoretical analysis.Combined with the total biomass resources per household in rural areas in northern Anhui,the average power generation per household of biogas power generation is 3372.67kW · h/a.It is not enough to maintain the continuous operation of the system;while using the roof plane to arrange solar photovoltaic panels,the photovoltaic power generation can meet the continuous operation requirements of the system.Therefore,it is possible to couple biogas power generation and photovoltaic power generation into a system in rural areas in northern Anhui,providing plot power for the realization of green and sustainable power,and realizing "zero emission".