The Ecological Study on Simulation and Analysis of Low-Temperature Air-Source Heat Pumps as Alternatives to Coal Stove Heating for Rural Dwellings in Northern China
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With development of era, there was a lack of professional guidance in local new village construction, and it led to some problems in rural areas, including serious resource waste, increase energy consumption, ecological destruction, and so on. In this study, the method for calculating the energy consumption and carbon dioxide emissions of air-source heat pump (ASHP) heating systems in low-temperature environments was established. Next, using this model, the energy consumption and carbon dioxide emissions of ASHPs, wall-mounted gas boilers, regional coal-fired boilers, and electric heating systems were simulated and compared. The simulation results show that the ASHP system has significant advantages in terms of energy saving and emission reduction. Finally, a combination of actual monitoring data showed that ASHPs have practical application for heating in the BeijingTianjinHebei region of China. The measurement data indicated that during the entire heating season, the coefficients of performance (COPs) of the four heating systems were 1.98, 2.33, 2.07, and 2.06, respectively, proving that ASHPs are a feasible alternative to coal stove heating in the BeijingTianjinHebei region of China.Keywords:
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That the air source heat pump(ASHP)will be applied for assisting the solar energy central hot water system in the integrated building project in northwest cold area is proposed.Taking a 10-layer residential of Lanzhou for example,the dynamic analysis of ASHP and the other alternated traditional assisted heating plans is made,emphatically making detail analysis of the annual cost's change affected by water supplying load,rate,price of energy and settings.The result shows that with the energy price rising,the using of air source heat pump for assisting solar energy central heating system has strong economic competitive advantage and it brings fairly good social benefits and environmental protection benefits.
Heating system
Economic Analysis
Cold winter
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This paper in view of the northern city produce large amounts of carbon dioxide in winter for heating and cause increasingly serious air pollution when burns coal, puts forward supply theory of combined heat and power (CHP) systems to provide housing and shops daily hot water supply, electricity, heating, cooling energy and designed a validation to test process and verify the formula of Combined Heat and Power systems , traditional heating system and air conditioning system in carbon dioxide discharge. Demonstrate the theory basis and validation method for using new type of heating mode when heating season in north.
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In north China,coal heating is a major way of urban heating in winter.However,pollutants discharged during the heating process have significantly aggravated atmospheric contamination in the season while increasing carbon emissions.Under the background of sustainable and low-carbon development,one of the important contents of urban heat supply planning is to choose an appropriate heating mode and to develop clean heat source according to local conditions.This paper discusses the principle,technical feature and advantages and disadvantages of various heating modes,such as intensive(coal) heating,intensive(gas) heating,distributed(gas) heating and distributed(gas)-renewable energy sources.Besides,it makes a comprehensive comparison between their low-carbon degrees and environmental benefits so as to provide reference to heating source program in central urban areas of Tianjin.
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The heating system with solar energy and heat pump in the purification of Shanxi's rural environment
By questionnaire surveys, we analyze the statistics of heating mode, energy consumption and pollutant discharge of residential heating in 55 counties of 11 cities in Shanxi province. We estimate and discuss the energy efficiency and the emission reduction in the wide application of the heating system with solar energy and heat pump in the province. It is suggested to solve the problems in the promotion of the heating system.
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Coefficient of performance
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Abstract The air-source heat pump (ASHP) is a relatively new, highly efficient technology which has been proven to be a feasible alternative in mild temperature climates. However, an ASHP’s application tends to be limited by outdoor temperature in cold climate zones. This study was intended to explore the feasibility of ASHPs in conjunction with traditional furnaces to serve as an innovative energy efficient method for heating homes in Canada. The goal was to quantify the cost and emissions savings of an ASHP hybrid heating system as compared with a furnace-only system for a residence in three Canadian cities. A prototypical residential building with a hybrid heating system was generated for heating load calculations. The theoretical analysis included the determination of the outdoor-temperature-dependent heat loss rate from the residence and heat supply rate of ASHPs. The building model has proved to be useful for further analyses, while the feasibility of the hybrid system has been determined to be highly region dependent.
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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.
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Solar water heating
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Fog and haze weather has seriously affected many important aspects of human life and physical fitness. In order to improve air quality, local government has transformed coal-fired heating into clean energy heating in Beijing rural areas. This paper introduces three typical clean energy heating systems which are low temperature air source heat pump (LTASHP), thermal storage heater (TSH) and wall-mounted gas furnace (WGF), researches and tests the practical operation situation of three heating systems in the field. To compare technical and economic feasibility of three heating systems, the paper takes such residence where energy-saving standard of building palisade structure is approximately 50% as the research object, and establishes technical and economic mathematical analysis models, compares primary energy consumption and carbon dioxide emissions of three heating systems. This paper adopts annual cost approach, comprehensively takes into account power capacity increasing tariff and gas pipe network construction fee, and compares initial investment, operation cost and annual cost of three heating systems respectively from the perspective of users and government. The results show that LTASHP is the most energy-saving and its annual cost is lowest in the three heating systems. LTASHP is the most suitable alternative solutions to coal-fired heating in the three heating systems in rural Beijing.
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The seasonal energy requirements and fuel consumption for heating purposes in the residential buildings in the city of Fez is estimated from the predetermined architectural design and material characteristics of the buildings and the regular meteorological temperature measurements by using the degree-days method. The environmental impact of heating in term of equivalent CO 2 emission is also investigated for two sources of energy: liquefied petroleum gas and electricity. As a conclusion, the length of the heating period is average 194 days, and the mean heating degree-days value is found as 1039 besides changing between 895.8 and 1171. The heating energy requirement for the prototype building varies between 132 and 217 kwh/m 2 depending on glassing type, glassing area percentage and infiltration rate. In term of kgoe, electricity consumption is 2.6 times greater than that of LPG. By using LPG instead of electricity as a fuel, the emissions of greenhouse gases can be devised by 3.
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