Numerical simulation of indoor environment of whole cooking process in small residential kitchen under constant natural ventilation
To investigate the changes in the indoor environment throughout the whole cooking process,this study used field measurements to monitor the air temperature near the operator during the cooking process and verify the accuracy of the kitchen model.Then,the Computational Fluid Dynamics(CFD)method was used to simulate the air temperature,velocity,and particle distribution in the kitchen and adjacent rooms during and after cooking in the Chinese Residential Kitchen(CRK)under the condition of constant air supply with the window opening.The whole cooking process lasted 12 min,including 10 min during cooking and 2 min after cooking.The User-Defined Function(UDF)is defined for the dynamic oil temperature and emission rate based on experimental results from previous studies,and the transient simulation was carried out in FLUENT within 12 min.The distribution of air temperature,velocity,and particulate matter concentration in the kitchen and adjacent room was obtained by simulation calculation.The results show that the heat diffuses significantly after heating the oil for 30 s.During the 10-minute cooking process,the air temperature changes at different heights inside the kitchen are different.The air temperature of the operator rises by about 10.0 ℃.The air temperature change in the space below 1.2 m is less than 3.0 ℃.The air temperature at 1.4 m rises by 5.0 ℃,and the air temperature difference at 1.8 m is greater than 10.0 ℃.For the adjacent room,the temperature difference during the entire cooking process is within 1.0 ℃.For the air flow rate,the air flow rate around the operator is 0.50 m/s,and the air velocity in the center of the kitchen is less than 0.10 m/s.The variation of air velocity in the adjacent room is within 0.10 m/s.For the distribution of particulate matter,the particle concentration in the kitchen changes greatly after 4 min,and the particle concentration in the adjacent room increases sharply after 6 min.The simulation results provide a reasonable reference time point for the switch of fan gear of the kitchen range hood,which is conducive to improving the working efficiency of the range hood and optimizing the options for its efficient operation.
environmental engineeringresidential kitchenconstant air supplynumerical simulationindoor environment
万方数据
维普
