In hot and humid regions, cooling anddehumidification are important issues of inindoor environment. In this study, theevaluation of solar-assisted desiccant airconditioningsystems utilizing periodicallyreactivated desiccant such as desiccant bedsunder hot and humid climates is performedthrough integrated building and equipmentsimulations. As a result, the periodicallyreactivated desiccant air-conditioning systemsperform with relatively higher percentage ofcomfort as well as higher primary energy COPof approximately 6.05 under not extreme highenthalpy conditions.
Thermal mass activation (TMA) can assure, incertain cases, thermal comfort conditionswithout the need of air conditioning systems.Even if other cooling systems have to be used,night ventilation significantly reduces theduration of the working time of additionalcooling systems.The desired night ventilation rate (NVR),could be achieved using either mechanicalventilation, natural ventilation or a combinationof these two methods (hybrid ventilationsystem).In this paper, we will investigate thefeasibility of night cooling using naturalventilation for a residential building in a hotregion of Fran
Traditional and modem natural ventilationtechniques have been integrated in a hybridsystem for a retrofitting of a public building inthe city of Mazara del Vallo (Ttaly). The hybridventilation and air cooling system integrates awind tower, an indirect evaporative heatexchanger, a ground cooling pipe network andventilated fagade. The first idea was to design apassive cooling system inspired to the typicalwind towers of the Middle East, being the areavery well ventilated.
HVAC (Heating, ventilating air conditioning)system is used to keep indoor air quality. Thepurpose of the traditional HAVC system isproviding a comfortable environment andventilating the indoor air pollutants. Recently,with the quality of life increasing, people havemore requests for indoor air quality. However,we found that the HVAC system still stressindoor ventilation, and temperature andhumidity adjusting.
This study was carried out systematically asfollows; at first, an investigation of grossbuilding-to-land ratio of real residential areawith GIs data was carried out. We obtained theresult that almost areas locate within the rangefrom 20 to 45%, and the average was 33%.From these results, reproduction-conditions ofbuilding-models in the wind tunnel experimentwere decided. Secondly, in these reproductionconditions,wind pressure coefficients ofresidential buildings were measured. Planshapesof target buildings were two kinds. Onewas rectangular plan wyth flat roof, gable roofand hipped roof.
The objective of this study is to identify theeffects of mirror duct system on energy savingsfor luminaries. The results of the experimentsshowed that more than half of the subjects judgedthe room was bright when the illuminance on thedesk from mirror duct system was higher than100 lx. Half of the subjects judged ceilinglurninaire could be turned off when theilluminance on the desk was higher than 100 Ix inthe case of relaxing. On the other hand, about80% of the subjects always switched on theluminaire regardless of the illuminance on thedesk in the case of reading.
Recently most houses in northern Japan have becomehighly insulatedand airtight, whichhave caused seriousproblems such as indoor air pollution. Therefore, it isimportant to evaluate the performance of an airtighthouse from the viewpoint of ventilation. The aim ofthis paper is to clarify airflow rates in a house bymeasuring outdoor airflow rates and convection airwith single/multiple tracer gas techniques. The modelhouse has an underground crawl basement space withouter insulation and is designed with a passiveventilation design.
Today lots of research and application of solarheating are focused on continuously occupiedbuildings, such as residential buildings. Thispaper studies solar heating for intermittentlyoccupied buildings such as offices, classrooms,workshops which generally are unoccupiedduring nights and weekends. If we stop spaceheating during nights, energy for space heatingwill be reduced. In the paper, a simple buildingis assumed and a solar assisted space heatingsystem is designed for it.
The results of a recent research and it'sstatistical analysis, show that in some of theIranian cities like YAZD, there are two periods(from end of august to end of September andfrom end of February to end of March) in whichoutdoor pollution is higher than other periods.School starting and industrial activities in thesummer could be the prime reasons of thisphenomenon.
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