To provide employees with thermal satisfaction and improve workplace productivity, subjects were studied during a heating period in an office room temperature modulation protocol takes into account aspects of human circadian rhythm. The following findings were obtained in this paper.

Task performance was improved by setting the room temperature 1K lower than 23℃ during morning hours and after lunch.

Sleepiness and Task performance did not affected by setting the temperature 1-2K lower than 23℃ during postprandial working hours.

Thermal environment satisfaction improves when the temperature was increased in the evening about 23-24℃.

Traditionally, when designing the thermal environment of a building, it is common to make the space uniform. However, humans exhibit thermal preferences. If the thermal environment distribution in a room can be used successfully to assign seats according to human thermal preferences, it has the potential to reduce occupant dissatisfaction levels. The social environment and technology required for this purpose are in place. Therefore, this study aims to investigate how an optimal allocation based on a model representing human thermal preferences can affect the average level of dissatisfaction among occupants.

“Natural paints”, that are mainly made from vegetable oils are considered to be less hazardous to health than organic paints. They do not have a clear definition or classification by constituents. This study aims to determine the effects of “natural paints” application with different compositions to wood on the indoor air quality. Natural paints containing organic components had worse perceived air quality than the natural paints owing to the pungent odor of aldehydes and alcohol. In the natural paints, high release of terpenes derived from vegetable oils had a masking effect on aldehydes.

This paper discusses the efficiency of flue and smoke tube boilers used in a district heating and cooling plant. In a general flue and smoke tube boiler, air for boiler combustion is provided at the lower level. However, in the boiler we studied, air for boiler combustion was provided at a higher level to use the high temperature air from the upper part of the boiler room to save energy. In this study, methods for improving the boiler efficiency were investigated by optimizing the intake air temperature of the boiler on the basis of CFD simulation and field measurements.