The density of Dhaka is increasing exponentially, and with it the demand for residentialaccommodation. Rapid densification is increasing hard surfaces and changing the urbantexture, thereby escalating heat absorption. This intensifies dependency on valuableconventional energy resources, for thermal comfort.Research shows that regional climatic data differs markedly from localised microclimaticeffects within the built environment. In built-up residential areas of the city there is the lack ofnatural wind flow, one of the most important ingredients for comfort during the warmmonsoons.
The article shows methods for wind influence on building ventilation systems analysis.Solution has been carried out through the experiment in wind tunnel as well as by CFDmodelling. Mean pressures and pressure variations have been measured on the model surfacewith respect of the ventilation intake and exhaust usual situating, with height of the roofparapets modification. The experimental results was presented by pressure coefficients-outputis possible convert to different boundary conditions. The wind effect was analysed in differentwind direction.
Global climatic warming trends are becoming more and more obvious. They are characterizedby longer and more intense heat wave periods as witnessed in extreme by the summers 2003and 2006. This situation asks for mechanical cooling applications in office buildings. Is itpossible to reach good indoor environmental conditions using hybrid ventilation strategiesonly? This question has been investigated by measurements in the Forum Chriesbach, a newlow energy office building located in Dbendorf, Switzerland.
The specific features of natural ventilation system combined with solar chimney andunderground pit installed in a new school building and the measured results for four years aredescribed. In summer and intermediate seasons outside air is introduced into the building offour stories through underground pit from the intake provided in the north end, brought intothe different occupied rooms from which the room air is discharged to outside through thesolar chimneys of 8 meters high above the roof by chimney action or pulling out action bywind.
PREA is a joint project between four European Universities and three African Universities aswell as the International Solar Energy Society (ISES), an international NGO, that promotesrenewable energy.
This paper presents an established sustainable and integrated design methodology for theefficient heating and cooling of individual buildings and complexes. The methodologyincludes the design basis for combined heat and power systems, refrigeration, air conditioningand heating with pump systems. It is equally applicable for single family houses as well aslarge building complexes and meets a major challenge in the design of heating and coolingsystems, namely, the complexity of energy and power integration.
Fuel cells offer an environmentally sound, distributed energy source for individual buildings.Many governments believe that security and sustainability of energy supply can be improvedwith this technology. Therefore large public support programmes are under way to facilitatethe commercialization of residential fuel cell systems.
This paper is devoted to the development of a decision support system that could assist districtheating authorities in strategic management of their asset. Such a tool is designed in order toanswer a variety of questions asked by concerned stakeholders regarding the future of adistrict heating (DH) system about optimal plant and fuel choice, possible network extension,valorisation of heat surplus, etc.The kernel of this system is a simulation model which determines the energy balance of agiven DH network, over any type period.
There is an obvious and indisputable need for an increase in the efficiency of energyutilisation in buildings. Heating, cooling and lighting appliances in buildings account for morethan one third of the worlds primary energy demand. In turn, building stock is a majorcontributor to energy-related environmental problems.
Nowadays no energy source should exist without regulation to ensure its efficient use. Theregulation can be quantitative, qualitative or combined. This article compares the utilizationof geothermal well in two situations. The first situation is when no regulation is used on thegeothermal well head. The second situation is when the exploitation of geothermal water isregulated on the geothermal well head, i.e. quantitative regulation is considered. Theregulation on the geothermal well head grants savings on the geothermal well because only asmuch geothermal water is consumed as needed.
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