Many dwellings in warm-humid climates attain a comfortable environment by natural ventilation.The opening of exterior windows for ventilation allows the entry of insects along with the breeze.As a remedy,occupants ins...Many dwellings in warm-humid climates attain a comfortable environment by natural ventilation.The opening of exterior windows for ventilation allows the entry of insects along with the breeze.As a remedy,occupants install insect-proof screens on windows resulting in reduced airflow into the interior.This study attempts to evaluate the air change effectiveness and thermal comfort in a residential kitchen with insect-proof screens.A kitchen with insect-proof screens on the windows is compared with a case without insect-proof screens.Numerical simulation was conducted using ANSYS Fluent 2019 R2.The insect-proof screen is modelled as a porous media.The air velocity and temperature measurements were validated by measurements in a real scenario.The presence of insect-proof screens reduced the air velocity inside the space by 82%.However,the airflow pattern in the case with screens was more uniformly distributed.The mean age of the air was considerably higher in the case with insect-proof screens,which in turn resulted in a reduced ACE.The presence of an insect-proof screen resulted in a Predicted Mean Vote(PMV)of 2.79 indicating a‘hot’sensation,whereas in the other case,the comfort vote is only 1.93 indicating a‘warm’sensation.The presence of insect-proof screens on windows reduced the air velocity and ventilation efficiency,contributing to increased thermal discomfort in the kitchen.展开更多
基金supported in part by the Department of Science and Technology,Ministry of Science and Technology,Government of India through the project-Community-Scale Energy Demand Reduction in India(CEDRI)under Grant DST/TMD/UK-BEE/2017/20.
文摘Many dwellings in warm-humid climates attain a comfortable environment by natural ventilation.The opening of exterior windows for ventilation allows the entry of insects along with the breeze.As a remedy,occupants install insect-proof screens on windows resulting in reduced airflow into the interior.This study attempts to evaluate the air change effectiveness and thermal comfort in a residential kitchen with insect-proof screens.A kitchen with insect-proof screens on the windows is compared with a case without insect-proof screens.Numerical simulation was conducted using ANSYS Fluent 2019 R2.The insect-proof screen is modelled as a porous media.The air velocity and temperature measurements were validated by measurements in a real scenario.The presence of insect-proof screens reduced the air velocity inside the space by 82%.However,the airflow pattern in the case with screens was more uniformly distributed.The mean age of the air was considerably higher in the case with insect-proof screens,which in turn resulted in a reduced ACE.The presence of an insect-proof screen resulted in a Predicted Mean Vote(PMV)of 2.79 indicating a‘hot’sensation,whereas in the other case,the comfort vote is only 1.93 indicating a‘warm’sensation.The presence of insect-proof screens on windows reduced the air velocity and ventilation efficiency,contributing to increased thermal discomfort in the kitchen.
