Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 35 for “"Heat Gain"”.
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Dynamic Materials and Devices for Controlling Solar Heat Gain in Buildings
… efficient, adaptive technologies. More efficient heating and cooling of both commercial and residential buildings is a strong candidate for such advancements. Indeed, a significant portion of the annual US energy budget is devoted to the heating, ventilation, and air conditioning (HVAC) of …
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Characterizing Water as Gap Fill for Double Glazing Units
… also allow significant unwanted direct solar heat gain caused by infrared light. Conversely, glazing systems that are designed to reflect unwanted direct solar heat gain significantly reduce the transmittance of visible light through windows. The goal of this research was to characterize the …
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A methodology for the evaluation of thermal performance of windows based upon life-cycle cost
… to perform life-cycle analyses of the solar heat gain through building windows as a function of the ability of the glazing to allow the penetration and utilization within the interior built environment of available sensible radiation from the natural environment. The life-cycle cost model …
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Scale model studies of displacement ventilation
… simulated a variety of cases in terms of heat gain per area, air supply flow rate and slow mixing at lower levels. Temperature distributions in the model and fluid flow rates were measured. Flow visualization was performed to investigate the flow patterns in the office room. The vertical …
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The architectural implications of passive solar cooling systems in hot-arid climates
… that reducing the glazed area reduces the total heat gain but this affects negatively both daylighting and the freedom of design to incorporate the exterior spaces. This can be solved by using the Low-E glass which has better thermal properties in terms of reducing both solar transmission and …
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Design and prototype of a partial window replacement to improve the energy efficiency of 90-year-old MIT buildings
… levels. The single panes of glass allow too much heat transfer and solar heat gain. In addition, the steel framework has warped due to oxidation and decay of the glazing compound, resulting in air and water infiltration. This thesis explored a feasible solution of a partial window replacement that …
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THERMAL-LITE : a microcomputer program for thermal and daylighting analysis
… in this country, has been attributed to heat gain or loss through windows. Although the thermal performance of windows has been dramatically improved since the first OPEC's oil embargo, it still remains of a concern of energy conscious design. In one way, the complexity of the thermal …
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Enhancing indoor air movement through roof design: a process of increasing thermal comfort in hot humid region housing
… and the methods of limiting interior heat gain are described. The effects of orientation, cross ventilation and material choice are discussed.
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Engineering solutions to address several current livestock and poultry housing challenges
… and sufficient well-being for laying hens under heat stress events, and 3) compromised air quality issues in most poultry housing systems. My research seeks to provide engineering solutions to address these three challenges currently faced by the animal production industry. This dissertation …
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The effects of building envelope parameters on energy performance for high-rise buildings in central Saudi Arabia
… use air conditioning extensively to overcome the heat and achieve thermal comfort. This research analyzed building envelope variables in an existing building in Riyadh, Saudi Arabia, and measured the effect on energy consumption and cooling loads based on ASHRAE 90.1-2019 and LEED guidelines. The …
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Thermal physiology of selected African ungulates with emphasis on the physical properties of the pelage
… The thick pelage provides good protection against heat loss and thus extends the ambient temperature limits which the animal can tolerate without the need to increase metabolic heat production. Schmidt-Nielsen (1959) has shown that a thick pelage can also be advantageous to an animal in a …
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Low energy cooling in multi-storey buildings for hot, arid climates
… the different factors that govern the control of heat gain through the envelope of the building will be analyzed. Also, solutions to minimize the cooling load for dwellings will be suggested/provided; by means of selecting the adequate cooling systems (evaporative, convective, and radiative) that …
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Time-varied daylighting performance to enable a goal-driven design process
… but non-spatial quantities related to solar heat gain can be compared on the same terms with spatial quantities like illuminance. This thesis demonstrates methods for quickly calculating annual data sets for which temporal maps are the intended display format. Metrics are then developed in …
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An analysis of annual environmental conditions and heat gains, and theoretical assessment of approaches to improve summer thermal comfort, of the Energy Research Centre at the University of Cape Town
… with emphasis on Cape Town's summer season. Heat gain components to the ERC are quantified, and a Base Case cooling scenario is determined; this characterises the peak cooling load and active annual cooling energy required to alleviate summer thermal discomfort, if no other interventions are …
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Evaluation of the potential impact of electrochromic windows on the energy performance of commercial buildings
… as they provide greater control of solar gains; they have a potentially significant impact on the indoor visual environment and energy requirements of commercial buildings. The research work presented in this thesis, which is accomplished using computer simulation, proposes to undertake an …
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Implementation and evaluation of thermal avoidance strategies in arid, cost-constrained climates aimed at improving indoor thermal comfort : a case study in Bhuj, India
… emissions, energy consumption, and urban heat island effects. India is a prime example of a region where new building trends, hot climatic conditions, increasing social aspirations, and rapid population growth is likely to spread the adoption of air conditioning. To reduce the need for air …
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Insolation transmission through a deciduous tree canopy: a winter study
… tree shadow patterns upon the passive solar heat gain of windows located within the tree shadow. This study offers as a guide to future research, the beginning of a tree typology. The typology categories trees commonly grown and available in Virginia, into form and size categories. The …
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The performance of an integral greenhouse solar air-heater
The Baird-type solar collector is a solar air-heater, utilising black shade-cloth as the absorber, that is incorporated as part of the roof of a greenhouse. It is intended to be used, in conjunction with a heat storage device, to provide greenhouse heating (and cooling), and so to assist in …
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The sea surface heat balance in the Benguela upwelling region
The surface heat balance of the Benguela upwelling area on the west coast of southern Africa is analysed. Measurements of the components of the heat balance were made in the St Helena Bay area from 14-21 October 1986. Additional long-term data was obtained from Alexander Bay and Cape Town. An …
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