Energy Saving Analysis And Management Of GSHP Air Conditioning System

In the future sustained rapid economic development,the general trend of energy development is still to develop new energy and renewable energy.Due to the increasing demand for energy in the rapidly developing economy and the increasing consumption of primary energy,the research and application of new energy and renewable energy are still extremely urgent.GSHP technology is an effective form of an underground heat energy utilization and application of renewable energy technology in recent years has been to maintain rapid development,but also in the process of project implementation still exist some problems to be solved,it is the soil heat accumulation problem,results in a continuous system operation efficiency is low,with the expansion of the scope of application and the increase of the running time,these problems become more and more obvious,especially in cold and hot load especially in uneven.Second,the energy efficiency of the GSHP system still has room to improve.Third,as an emerging industry,GSHP is short of talents,quality of design,construction,operation and management may be mixed,leading to project implementation fails to reach the expected energy saving target.Based on the above situation,this paper studies and analysis object somewhere in Changsha area source heat pump project,analysis the instance of the influencing factors of GSHP system and energy saving,and from the design,construction,operation and management of GSHP system,the paper analyses the influence factors of energy saving is introduced,for the implementation of the GSHP system and energy-saving management to provide the reference.The main contents of this paper are as follows:(1)GSHP system in the different heat transfer medium,according to the ground heat exchanger can be divided into the GSHP system of groundwater,surface water and GSHP system buried pipe GSHP system,based on the GSHP exchanger + cooling tower auxiliary cooling of the composite system as an example,introduces its working principle and classification,and comparing the advantages and disadvantages of series of cooling tower and parallel cooling tower system.(2)Exergy calculation and analysis were performed on the GSHP system of a specific engineering instance by using the first law and the second law of thermodynamics,as well as the factors that have a great influence on energy consumption and the space for improvement of system energy conservation.(3)The whole process management is very important for the successful implementation of GSHP system.This paper introduces the influence of GSHP system on energy saving from the aspects of design,construction and operation management,and provides reference for the implementation and energy saving management of GSHP system.The research results of this paper show that the hybrid GSHP system can improve the operation efficiency and stability of the GSHP system,and the use of cooling tower & buried pipe hybrid GSHP air conditioning system in hot summer and cold winter area can effectively solve the problem of soil thermal imbalance.Taking the research project in this paper as an example,since the GSHP unit is driven by electric power,it suffers a lot of high grade electric energy loss.The largest Exergy loss of all the system is the GSHP unit,accounting for 75.53% of the total Exergy loss of the system.The Exergy efficiency is also the lowest,only 16.66%,which leaves a lot of room for improvement in energy conservation.Exergy loss of the transmission and distribution system is the lowest and Exergy efficiency is the highest.The Exergy efficiency of the buried pipe heat exchange system is comparable to that of the floor radiant end,so there is still room for improvement in Exergy efficiency.Although changing the inlet and outlet water temperature of the ground source side or the air conditioner on the user side has no direct impact on the Exergy efficiency of the system,the change of water temperature can change the input power of the heat pump host,which indirectly affects the Exergy efficiency of the system.This paper simulated the influence of water temperature in and out of the source side of buried pipe on the Exergy efficiency of the system,and it was found that as the temperature of water in and out of the source side increased by 1℃,the Exergy efficiency of the buried pipe heat exchanger increased by about 10%.Process management is the successful implementation of GSHP system important management method,this article from the analysis and design of GSHP system design process to implement energy saving effects,through the early stage of the geotechnical thermal response test design error,and can reduce the ground heat exchanger at the same time need to base the source heat pump unit operation fixed ground heat exchanger in heat,reasonable selection system can reduce the size of the heat exchanger design as well as avoid the soil thermal imbalance,based on the system choose high can effect comparing GSHP units can reduce system Exergy losses.The effect of construction on energy saving of GSHP system is analyzed from the construction link.The effective well depth,backfill density,exhaust blockage prevention and other indexes of ground pipe heat exchanger determine the heat exchange efficiency and system energy saving rate.In terms of operation management,operation strategy and operation management can be started to optimize the operation of cooling tower.Three strategies,namely temperature difference control,temperature control and time control,can be comprehensively considered to ensure the long and efficient operation of the whole heat pump air-conditioning system.