Study On Building Energy Efficiency Technologies For Prefabricated Cabin Type Of Industrial Building

As Intelligent Electric Grid,Mobile Internet and Internet of Things(IoT)develop,there are more intelligent substations,the center of electric dispatch and control,which are under construction.While substations' number and scale are increasing rapidly,microcomputer monitoring and integrated automation system have replaced the conventional one,leading to increase of heat load,energy consumption and maintain cost.Meanwhile,site selecting of urban substations become more difficult.Consequently,concept of prefabricated cabin,which can be prefabricated and in a more compact size,is presented.However,there is lack of study in energy efficiency of prefabricated cabin.And control system of prefabricated cabin hardly matches intelligent hardware.In this study,the following work including theory and experiment,aiming at energy efficiency design strategies and technical problems solving of prefabricated cabin,have been done.1.Study on thermal performance simulation model of prefabricated cabinThermal performance simulation model of prefabricated cabin is established,in response to the practical demand of decoupling cabin environment and cabinet microenvironment to achieve accurate control.This model provide the basis for prefabricated cabin energy efficiency optimizing and intelligent control system operating.This model is divided into 6 submodels for different building energy efficiency factors.In order to increase the rationality and practicality,factors' optimization and thermal performance simulation are conducted in this study,as well as submodels' verification by field tests.2.Investigations and tests on prefabricated cabinInvestigations on classification of prefabricated cabin,heat flux of cabin equipment,enclosure structure,and operating strategy environmental control system are conducted.Typical prefabricated cabins are tested in site.The whole heat transfer process of prefabricated cabin is analyzed combined with test data,by which thermal properties of prefabricated cabin are summarized.3.Evaluation on energy efficiency strategies and effects of prefabricated cabinTake Shenzhen which is located in subtropical region as example.Field test,mechanism analysis and computer simulation are conducted,in order to attain basic characteristics of prefabricated cabin in heat transfer and effect factors of prefabricated cabin energy efficiency.Furthermore,effect of factors on energy efficiency is studied,in order to present corresponding methods.Finally,different energy efficiency techniques are analyzed.Results of combination of different techniques are summarized and their rationality explained.Accordingly energy efficiency strategies of prefabricated cabin are presented,to provide energy efficiency optimization guidance and suggestions on prefabricated cabin in subtropical region.4.Study on prefabricated cabin environment control techniquesThermal environment characteristics are evaluated according to air flow distribution attained by air flow tests on typical prefabricated cabin.Problems existing in air flow distribution are analyzed and accordingly optimization principles of air flow distribution are summarized.Furthermore,optimized environmental control strategy is presented,that is,cooling-capacity-controllable air supple by independent pipes on the premise of not changing present layouts and process requirements,with combination of closing methods of cold and hot channels.It can be known that optimized strategy can improve thermal environment and decrease air-condition energy consumption significantly,by air flow tests results before and after improvement.5.Study on prefabricated cabin intelligent control systemCooling modes,control techniques and strategies are optimized from the prospect of energy efficiency.Thermal simulation model is embedded in control strategies and processes.Intelligent environment control system,consisting of software platform and IoT hardware which enable basic data collecting,computer simulation,data processing,analysis & decisionmaking,are constructed.This system can achieve multi-parameters monitoring and multi-goals coordinate controlling.This system can complete intelligent environment control process including online analysis & decision-making,automatic control and intelligent adjustment,according to system control procedure.Stable and reliable operation and obvious energy efficiency achievement are proven by computer simulation.Above all,this study is themed on intelligent substation energy density and building energy efficiency of prefabricated buildings.This study presents thermal performance simulation model of cabinet microenvironment,as well as optimized enclosure construction design and environment control technique for practical engineering situation.Moreover,this study presents cabinet microenvironment control strategy based on predicted thermal performance model and embeds it into intelligent substation environment system by IoT means,achieving the environment control goals of automatic control,intelligent adjustment and online analysis & decision-making and coordinate interaction.