To study the draft sensation distribution of an air jet supply system in a large space building in summer,experiments are conducted in a large laboratory.The temperature,velocity and draft sensation distributions at a...To study the draft sensation distribution of an air jet supply system in a large space building in summer,experiments are conducted in a large laboratory.The temperature,velocity and draft sensation distributions at a nozzle height of 4 m in the occupied zone are obtained.Then,the numerical simulation under the test condition is carried out by the computational fluid dynamics（CFD）method.The calculation results of the indoor vertical temperature and the draft sensation distribution are validated by the test data.Simulations with different nozzle heights are conducted.The satisfactory air supply condition is determined by analyzing the draft sensations and the temperatures in the occupied zone under three conditions.The simulation results show that the optimal draft sensation distribution and the uniform temperature and velocity fields can be obtained at a nozzle height of 5 m.展开更多
To study the effects of perceived control on human thermal sensation and thermal comfort in heated environments,a psychological experiment was conducted.In total,24 subjects participated in an experiment.The experimen...To study the effects of perceived control on human thermal sensation and thermal comfort in heated environments,a psychological experiment was conducted.In total,24 subjects participated in an experiment.The experiment consisted of two cases in which the indoor temperature was set at 18℃ with different cold radiation temperatures.The experiment lasted for 120 min and was divided into three phases,adaptation,without perceived control and perceived control.In the second phase,the subjects were told in advance that the indoor temperature could not be adjusted.In the third phase,subjects were told that they could adjust the indoor temperature to meet their own thermal expectations,but the indoor temperature could not actually be changed.The results showed that the effect of perceived control on thermal sensation was related to the thermal expectation.For people with strong expectations for a neutral environment,perceived control improved their thermal sensation by satisfying their thermal expectations.For people with low thermal expectations,perceived control reduced their thermal tolerance to the environment,eventually leading to thermal discomfort.These new findings provide more supports for the importance of psychological effects and a reference for the personal control of heating temperatures.展开更多
基金The National Natural Science Foundation of China(No.50478113)the Leading Academic Discipline Project of Shanghai Municipal Education Commission(No.J50502)
文摘To study the draft sensation distribution of an air jet supply system in a large space building in summer,experiments are conducted in a large laboratory.The temperature,velocity and draft sensation distributions at a nozzle height of 4 m in the occupied zone are obtained.Then,the numerical simulation under the test condition is carried out by the computational fluid dynamics（CFD）method.The calculation results of the indoor vertical temperature and the draft sensation distribution are validated by the test data.Simulations with different nozzle heights are conducted.The satisfactory air supply condition is determined by analyzing the draft sensations and the temperatures in the occupied zone under three conditions.The simulation results show that the optimal draft sensation distribution and the uniform temperature and velocity fields can be obtained at a nozzle height of 5 m.
基金Project(2018YFC0704500)supported by the National Key R&D Program of China during the 13th Five-Year Plan Period。
文摘To study the effects of perceived control on human thermal sensation and thermal comfort in heated environments,a psychological experiment was conducted.In total,24 subjects participated in an experiment.The experiment consisted of two cases in which the indoor temperature was set at 18℃ with different cold radiation temperatures.The experiment lasted for 120 min and was divided into three phases,adaptation,without perceived control and perceived control.In the second phase,the subjects were told in advance that the indoor temperature could not be adjusted.In the third phase,subjects were told that they could adjust the indoor temperature to meet their own thermal expectations,but the indoor temperature could not actually be changed.The results showed that the effect of perceived control on thermal sensation was related to the thermal expectation.For people with strong expectations for a neutral environment,perceived control improved their thermal sensation by satisfying their thermal expectations.For people with low thermal expectations,perceived control reduced their thermal tolerance to the environment,eventually leading to thermal discomfort.These new findings provide more supports for the importance of psychological effects and a reference for the personal control of heating temperatures.
