| Air duct air source heat pump system is a new type of household central air conditioning system that utilizes the characteristics of air source heat pump to cool and heat.In recent years,with the increasingly serious problems of energy and environment,the efforts to push forward energy saving and emission reduction must be taken.It has made the above system get more attention and application in hot-summer and cold-winter region.The critical factors that can influence its extensive application are the thermal comfort and economy of the system.Therefore,this paper combined the numerical simulation and the experimental research.Through the comparison with other traditional air conditioning systems,to explored the feasibility in air duct air source heat pump system in residential buildings in hot-summer and cold-winter region.The first part of this paper briefly introduces the design of the air duct air source heat pump household central air conditioning system.Considering the characteristics of residential buildings in hot-summer and cold-winter area,the study discussed the technical points of the load calculation,equipment selection and duct arrangement of air conditioning system.The results show that the design should be combined with the load characteristics of the residential building,and select the appropriate air source heat pump unit.Meanwhile,it is recommended to use winter conditions as the basis of equipment selection,and then check the calculation of summer conditions.It is conducive to ensure that the system is really green and energy saving.In the second part,the thermal comfort analysis of the air conditioning system is made in the form of the numerical simulation and the experimental research.First,the Airpak software is used to simulate the airflow in the form of two kinds of locations of the air supply device.One is on the floor,another is on the ceil.And the study respectively compare the two situations’ the temperature field,the velocity field,the PMV and the PPD index.The simulation results show that the uniformity and the thermal comfort of the air duct type system is better when the air supply device is on the floor.Then the experiments are used to further explore the simulation results.The experimental results fitted quite well with the simulation results.This airflow form meet the requirements of HVAC specifications for residential buildings in hot-summer and cold-winter region.The occupied zone has excellent airflow uniformity and good thermal comfort,while in winter the heating efficiency and heating stability of the unit have to be further improved.On the basis of the analysis of thermal comfort,the last of this paper further studies the economic benefit,energy saving efficiency and environmental emissions of the air conditioning system.Based on the comparison with the traditional air-conditioning forms,the following conclusions are drawn.On the economic side,the air conditioning system’ s annual dynamic cost in this subject is only higher than the ground source heat pump system.The initial investment and the annual running cost are low in this air conditioning system;On the energy saving efficiency side,the primary energy utilization rate is 0.71.Besides,the efficiency of the power grid is increased by 107.6%.In general,economic benefit and energy saving efficiency are excellent.However,due to the limitations of system COP of this subject,the air conditioning system in this subject has to be paid attention to the environmental emissions.This paper aims to investigate the feasibility about the application of air duct air source heat pump household central air conditioning in residential building in hot-summer and cold-winter region,hope to provide theoretical guidance and technical support for its application in practical engineering. |
PDF Full Text Request