Research On Prototype Energy Consumption Model For Hospital Buildings

Prototype energy consumption model is fundamental for analysis and management,such as energy saving potential analysis,energy market evaluation,carbon emissions calculation,etc.Therefore,prototype energy consumption models for buildings are significant.Since only prototype models of commercial buildings and residential buildings have been studied in China,this paper gives the specific technical route of prototype model building and establishes the prototype energy consumption model of hospital buildings.Furthermore,based on the prototype model,the factors affecting the energy consumption of hospital buildings are analyzed according to the near-zero energy consumption standard,and the energy saving potential of corresponding parameter changes is calculated,which provides theoretical support for the energy saving transformation of hospital buildings.Initially,this paper collected the architectural information of 60 buildings in 13hospitals in Changsha employing field investigation,online information retrieval,and literature research,and obtained the geometric size information,medical function zoning layout,and air conditioning system form of each medical building.By referring to the standard,the heat transfer coefficient and thickness of the envelope were obtained,and the heat disturbance information such as indoor personnel density,lighting power density,and per capita fresh air volume was set through literature research.Finally,the geometric information,functional layout,envelope parameters,indoor heat disturbance,and air conditioning system type of three typical building energy consumption models such as medical,outpatient,and inpatient departments were comprehensively determined.Open Studio modeled the determined parameters,and the energy consumption per unit area of the three medical buildings was obtained,respectively:247.59k Wh/m~2,219.58k Wh/m~2,and 149.64k Wh/m~2.Then,with the area ratio as the weight,the three buildings’energy consumption per unit area was weighted and averaged.The typical hospital model’s energy consumption per unit area obtained by simulation was 165.75 k Wh/m~2.The simulation results were compared with the average annual energy consumption per unit area of the hospital building in hot summer and cold winter regions obtained by literature reviews.It shows that the simulation results of the typical energy consumption model are in the reliable range.Finally,based on the typical model,according to the relevant parameter values in the Technical Standard for Buildings with Near Zero Energy Consumption(GB/T 51350-2019),the thermal parameters of exterior Windows,lighting power density,cooling performance coefficient of cooling mechanism,the thermal efficiency of boilers,indoor set temperature and other parameters are modified to analyze the contribution rate of various energy-saving renovation measures to the building energy saving potential.Combined with the actual project,the corresponding energy saving suggestions are given.The results show that compared with the basic model,the thermal parameters of the external window of the medical technology building model have the maximum energy saving potential of 4.93%within the corresponding value range.Reducing the lighting power density can effectively reduce the total energy consumption per building area.Compared with the basic model,the outpatient building model’s maximum lighting power density value has an energy saving potential of 5.66%.Improving the efficiency of the refrigeration unit can effectively reduce the total energy consumption of the building.Compared with the basic model,the cooling performance coefficient of the outpatient building model has a maximum energy saving potential of 3.56%within the corresponding value range.Improving the boiler’s thermal efficiency can also effectively reduce the total energy consumption of the building.Compared with the basic model,the outpatient functional building model’s boiler thermal efficiency parameter value has a maximum energy saving potential of 1.43%within the corresponding value range.In a reasonable range,reducing the indoor temperature set value in winter and increasing the indoor temperature set value in summer can effectively reduce energy consumption.Compared with the basic model,the energy saving potential of the indoor temperature set value in the corresponding range of the medical and technological functional building model is up to 10.53%.The total energy consumption per unit area of the medical building decreased from 247.59 k Wh/m~2 to164.33 k Wh/m~2,and the energy saving percentage was 33.63%.The total energy consumption per unit area of the outpatient building decreased from 219.58 k Wh/m~2 to164.37 k Wh/m~2,and the energy-saving percentage was 25.14%.The total energy consumption per unit area of inpatient buildings decreased from 149.64 k Wh/m~2 to89.16kwh/m~2,and the energy-saving percentage was 40.42%.Therefore,selecting appropriate exterior window materials and setting appropriate exterior window thermal performance parameters are effective ways to reduce the energy consumption of the building itself.According to the different functional divisions of buildings,the selection of appropriate energy-saving lighting fixtures is an effective means to reduce building energy consumption.The selection of energy-saving cold and heat source equipment can effectively save energy in the air-conditioning system.Increase the automatic control system to control the indoor temperature and humidity within a more reasonable range,which can also effectively save energy.This study provides a certain reference for the energy-saving design of hospital buildings,and provides a certain theoretical support for the corresponding energy-saving renovation measures.