Study Of Cooling And Heating Mode Along The Shaanxi Highway Construction Facilities

Environmental pollution and energy shortages have become a global issue of concern.From the perspective of sustainable development,it is an effective way to reduce energy consumption by using renewable energy and improving energy efficiency.Through the investigation of the present situation of cooling and heating of the building along the expressway,we found that conventional coal-fired boiler with spilt air conditioning system have many disadvantages,thus there is a great demand for the energy saving reformation.Ground source heat pump technology has the advantages of high efficiency and energy saving,which is widely used in construction field.Currently,ground source heat pump system are widely used in buildings in many cities of Shaanxi,such as large-scale office buildings,shopping mall,hospitals,villas,etc… But for the highway construction facilities,such as the highway service area and management station,the technology is rarely used.Five feasible modes of cooling and heating is selected by analyzing the characteristics of cooling and heating needs on construction facilities along the highway,they are ground-water source heat pumps(GWHP),ground-coupled heat pumps(GCHP),Variable Refrigerant Volume system(VRV)and oil-fired(gas-fired)boiler with split air conditioning system.The characteristics of each mode are expounded,and then the applicability of two kinds of ground source heat pump system is analyzed by collecting relevant hydrogeological datas based on Analytic Hierarchy Processand(AHPA)and entropy weight method,respectively selects the factors that affect the applications of ground source heat pump technology and determines the weight,and gets all terrain area applicability of ground source heat pump technology in Shaanxi province.On the basis of the application of ground source heat pump technology,the highway construction facilities load regionalization is combined to analyze the economy and energy saving for comprehensive evaluation,finally the most suitable heating and cooling mode of the highway construction facilities is calculated in different regions and different construction scale.The following conclusions are obtained by evaluation: 1)Five kinds of cooling and heating mode in terms of technical applicability,two ground source heat pumps are limited for ground and underground conditions,groundwater and rock and soil physical parameters are the mian influence.The application of the GWHP area includes the Shaanxi southern basin central area,namely river floodplain and low terrace,plus the guanzhong plain valley terrace and diluvial plain.The application of the GCHP area includes the Shaanxi southern basin,the guanzhong plain and the northern plateau region.2)In terms of economy,when load and construction area of building are different,the economic advantages and disadvantages of each system are different.Cooling and heating loads affect the operation cost and equipment initial investment,while construction area affects the initial investment of two ground source heat pump.3)In temrs of energy-saving,section of per unit area energy conservation amount of each system from high to low order as: GWHP,GCHP,VRV system,oil-fierd boiler and gas-fierd boiler with split air conditioning system.4)The highway constructed site location,construction area and decision-makers all affect the comprehensive evaluation.5)In general,the service area and manage construction is large,two kinds of ground source heat pump has obvious advantages if the technology can be used,the toll station area is small,VRV and gas-fired boiler with split air conditioning system has good suitability.