A numerical model of an underfloor air distribution system was created to aid future research on the system's environmental performance. A validated numerical model can serve to minimize the need for costly experimental setups. This paper presents theresults of an experimental and numerical study 1. INTRODUCTIONof the air temperature distribution of anunderfloor air distribution system.
It is believed that one method of maltingeffective use of energy is the sharing ofhydrogen energy or heat and electricityproduced by cogeneration systems at multiplefacilities in the community. In this regard,temporal changes in energy demand at variousfacilities in the comniunity greatly influencethe efficiency of such systems. Therefore, theactual conditions of heat demand as well aselectricity demand of different types ofbuildings were summarized
Recently, supplying glass space like atrium isbeing extended widely for introducing naturallight into a building, improving rest roomfunctions and having a pleasant workenvironment. However, some problems canoccur in atrium such as overheating andexcessive vertical temperature difference duringthe summer time, making people feel unpleasantand increase air conditioning load.This study targets that the air conditioning loadaccording to characteristics of the atrium'svarious windows can be expected throughbuilding energy performance evaluationanalysis.
Honda Wako Building(hereinafter called HWB)" is ahigh efficiency saving energyoffice building with six floorshaving 52,138-m2 of total floorarea. Honda Motor Co., Ltd(hereinafter called HondaMotor) required reducing 50 %of emission of life cycle CO2 ascompared with a standardbuilding at the design stage. Torealize energy saving building,the architectural plan has twodistinguishing characteristics.Firstly, both of whole ofsouth and north of facadeconsist of low-e coating glassesand aluminum panels.
Realistic knowledge of window-opening andfans use behaviour is needed, for the thermalsimulation of naturally ventilated buildings. Ifcontrols such us windows and fans wereefective and easy to use, thermal discomfortcould be largely avoided. In practice theremay be constraints that hinder the use of suchcontrols. In uny thermul simulation theseconstraints need numerical values. In thispaper, we explore the nature and extent ofsome of the constraints operating on the use ofwindows and fans, making numericalestimates of their magnitudes from extensivefield databases.
This paper describes the merit of daylighting bycomparing the physical and psychologicalaspects of light and heat radiation. We preparedthree rooms: direct lighting with fluorescentlamps; indirect lighting with incandescentlamps; and daylighting alone. We conductedphysical measure-ment associated with light andheat, together with subjective experiments interms of luminous and thermal sensations.The measurement was done in August, 2006,and also in December, 2007. In summer, the airtemperature of the room with daylighting alonewas lower than two other rooms with electriclighting.
Recently post-occupancy evaluation is oftenused to know the actual performance of socalledenergy saving building components andto compare with simulated performance. Inreality, the occupants choice how to achievecomfortable conditions, e.g. by switching on anair-conditioning unit or opening a window,influences significantly on the exergy balance ofthe building systems.
The author had participated IEAIECBCS Annexprojects since 1987, starting from Annex 16 forBEMS, ending at Annex 40 for Commissioning.I used to recognize how this line of continualset-up of subjects to optimize HVAC design andmaintenance through system simulation, BEMSmeasurements, fault detection and diagnosis andbuilding optimization technologies, which ledthe way to building commissioning, had beenwell designed just as by god's hand.
Air tightness is an important property ofbuilding envelopes. It is a key factor indetermining infiltration and related wallperformanceproperties such as indoor airquality, maintainability and moisturebalance. Air leakage in U.S. housesconsumes roughly 113 of the HVAC energybut provides most of the ventilation used tocontrol TAQ. The Lawrence BerkeleyNational Laboratory has been gatheringresidential air leakage data from manysources and now has a database of morethan 100,000 raw measurements.
Energy-efficient building design often makes use of night-time ventilation or thermal slab activation. The quality of the design tools used depends on the quality of the empirical valuesused within them such as heat transfer coefficients. Thus, an experimental facility for investigationof room ventilation and indoor heattransfer has been built at Biberach University ofApplied Sciences in Germany. lnitial tests havebeen conducted investigating natural convectionheat transfer with an electrical heating elementon the floor.
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