This paper investigates stress recovery effect of greenery volume in an office space. Indoor greenery is expected to mitigate stress of occupants in an office space mainly due to the visual effect. Subject experiments are carried out to investigate the maximum effect of indoor greenery by changing greenery volume in a simulated office space. Two types of desk layouts are prepared for the experiments. Greenery volume and layout are modified in 6 types, including the control condition without a plant. Pulse rate and flicker value are measured and inquiry by the semantic differential is carried out for the subjects. As a result, the maximum stress recovery effect is observed when the greenery volume is in the middle ratio for the dynamic visual field.
This paper investigates physiological effects of indoor greenery in a simulated office space as a result of subject experiments. Indoor greenery is expected to mitigate stress of occupants in an office space mainly due to the visual effect. However, the optimal green volume is unknown to recover from stress in an office. In order to investigate the optimal green volume, subject experiments are carried out in a simulated office room with greenery of 6 types of different green factors, including the control condition without a plant. As a result, the optimal green factor to mitigate stress is evaluated when the green factor is in the middle ratio for the dynamic visual field among 6 types of greenery layouts. The optimal green layout by the subject experiments is the same type as the inquiry survey previously submitted.
In order to create a comfortable environment in the work place around commercial kitchen, it is desirable to accurately predict the capture efficiency of exhaust from the cooking appliance by CFD. Due to insufficient diffusion in buoyant plume, however capture efficiency tends to be overestimated in the k-ε model. In this study, we confirmed that the problem of the k−ε model in the prediction of plume is originated from the buoyancy production of the turbulent kinetic energy by comparing among the measurement value, simulated results using the LES model and the k−ε model, and possible remedy for discussed.
Research questionnaire was carried on the usage of housing equipment focusing on the continuous ventilation system in apartment houses. It was confirmed that ventilation systems are operated 24 hours more than 80% of the respondents, and the operating ratio increases as the household number increasing. On the other hand, the ratio of opening outdoor air inlets for ventilation system was as low as about 50%. Cross correlation analysis showed that the operation of continuous ventilation system is effective in suppressing dew condensation, mold and bad smell, and the majority of respondents evaluate the ventilation system satisfactorily. Separate analysis by age revealed that aged households are very sensitive on utilities expense and tend to apply local heating of a room and bathing is not frequent.
Total heat exchangers are useful in reducing thermal load of heating and cooling systems with high electric power consumption because they decreases fresh air load, and consequently are the subject of much expectation -especially with regards to their energy saving effect in regions with under cold climatic conditions. In the present study, an evaluation was on the thermal comfort and energy saving effect when total heat exchangers were adopted for detached houses in a mild climate region. The results of the study suggest that the heating load can be reduced by about 10% and heat recovery may have a reverse effect in intermediate seasons, and also have a small effect on the cooling load, but the cooling load can be reduced by about 20% by utilizing natural ventilation.
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