In most conditions, the excess heat of exhaust water discharged from household or publicbathing-rooms is mostly not utilized, which causes a lot heat loss for its higher temperature. For thisreason, it is suggested that a heat pump that uses the exhaust water as a low-temperature heat sourceshould be used to reclaim its excess heat to produce sanitary hot water for the public bathing-rooms. Inthis way, we call the above-mentioned heat pump as bathing room heat pump water heater.

Since 1970s, kinds of condensing boilers (CB) have been widely applied in HVAC engineering, theirexit flue gas temperature is very lower, even down to about 40?-45?, and their thermal efficiency isvery higher, even up to about 107%~109%, based on low heat value. The application of CBs in HVACsystem or hot water supply system can increase thermal efficiency and reduce the consumption of fuel,because of the utilization of latent heat of vapour in the exit flue gas.

For reduction of Green house Gas emission, Polymer Electrolyte Membrane Fuel Cells (PEFC) ispromoted by the government in Japan as more efficient co-generation system(CGS). On this study forthe purpose of finding the efficient energy supply system with PEFC in the apartment house, first theauthor proposed PEFC Apartment House as more efficient system than the current one (boiler andelectric power), which consists of PEFC-CGS, thermal storage tanks, power network and managementsystem.

In buildings growing conditions for mould fungi can occur and cause fungus infestation. Therefore,consequent measures have to be taken to avoid health dangers that come from mould fungi inbuildings. In order to avoid the mould fungus formation, a strategy has to be set up that focuses on thegrowth conditions for mould fungi. While in Germany only relative humidity is used as an assessmentcriterion for mould growth risk, more and more measured isopleths are used abroad.

This study was performed to investigate an influence of ventilation rate change on the level of aerialcontaminants in the confinement pig building. There was not significant difference in total dust and totalairborne microorganisms among three levels of ventilation rate (p>0.05) whereas the increasedventilation rate lowered the levels of respirable dust and gaseous compounds (p

Increase in high-rise residential building has changed the envelope of residential building to aluminumcurtain wall which requires the use of the single-sided ventilation to be used instead of the crossventilation. It causes dissatisfaction mainly with indoor air velocity and ventilation volume. Therefore,the objective of this study is to improve the natural ventilation performance of high-rise residentialbuilding by opening design. To improve the natural ventilation performance in single skin faade, theeffect of different types of window will be evaluated.

This study aimed to investigate volatile organic compound (VOC) emission fluxes from a new air filtermedia and a used one. The emission tests from air filters were carried out by the small chambermethod and a new chamber method developed in this study. And the VOCs in an actual air conditioningunit were measured in order to confirm the emission from the air filter. The some VOCs emitted fromused air filter could be detected in the emission tests. The air filter medias emitted formaldehyde andother organic compounds, and airflow through filter media changed emission fluxes.

The purpose of this paper is to analyze the indoor thermal environment and ventilation efficiencycreated by various heating and ventilation systems using CFD. In the case of one room, the value ofmean local air exchange efficiency????*1 of breathing zone*2 becomes about 1.0, because fresh airspreads completely in the room when air-conditioners are operated. In contrast, when air-conditionersare not operated, the mean ?? becomes smaller than 1.0, and the area of poor ventilation efficiencybecomes large.

This paper reports the effects of air quality and thermal environment on motivation and performance forstudents. The psychological condition of subjects can strongly influence their performance for learning.In this paper, the motivation for learning is evaluated by using a questionnaire as a self-assessmentform. According to the previous research, motivation for learning becomes biased when the learningperformance of the student is measured.

In recent years, in the quest focused about energy conservative building design, as a high efficiencyair conditioning scheme, the variable air volume (VAV) systems owe their growing popularity in heating,ventilation and air conditioning (HVAC) applications. This paper reports the simulation study toinvestigate the inherent operational characteristics of direct expansion (DX) VAV air conditioning (A/C)unit when the supply air fan and compressor speeds are varied based on the thermal load persisting inthe conditioned space.