Thermal Environment Simulation And Energy Consumption Analysis Of The Composite System Of Radiant Floor Cooling And Task Air Conditioning

It is an important issue of concern in the industry to improve indoor thermal comfort,air quality and reduce air conditioning energy consumption.The floor radiant cooling system is a kind of air conditioning systems that are very energy-efficient and comfortable,but it can’t assure the indoor air quality and the dehumidification requirements if it works individually,so it must be combined with the fresh air system.Task air conditioning is a personalized ventilation mode that focuses on controlling the micro environment around person.The radiant floor cooling and task air conditioning are combined in this paper,simulate and analysis the indoor thermal environment and energy consumption when the combined system is applied in the modern office buildings.Specific work is as follows:First of all,three commonly turbulence models and two radiation models from the Airpak software are used into the CFD simulation that based on the radiant panel cooling experiments by K.Nagano in 1997,to improve the accuracy of the indoor thermal environment simulation radiant cooling system.Compare the simulation results with experimental results,analysis the applicability of different models in radiant cooling simulation.The result shows that Standard K-ε turbulence model and discrete coordinate radiation model has the highest calculation accuracy to the radiant cooling.On this basis,the air distribution of a standard four people office is simulated,analysis the distributions of the temperature,velocity,PMV-PPD,the effective utilization rate of energy etc.in the personnel activity area each case.Obtain the combined conditions that are satisfied with design requirements and the thermal comfort of human body for the combined system.Finally,analysis the energy consumption of the office building with TRNSYS.The results show that,to achieve the same design temperature,the change of radiant panel surface temperature has the greatest impact on the general energy consumption of the combined system;the second is the task air temperature;and the change of task air volume has a less influence.Comparing the energy consumption of three kinds of radiant floor cooling and fresh air combined systems,compared with the displacement ventilation and mixing air supply,the task air conditioning has a significant energy saving effect.This paper provides a technical reference for the application of combined system of the radiant floor cooling and task air conditioning in office buildings,by the study on the indoor thermal environment and energy consumption.