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 19 of 19 for “"heat gains."”.
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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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Energy use in multi-family dwellings : measurements and methods of analysis
… no more than 105 kWh/m² annually including space heating, domestic hot water heating, common electricity and household electricity. Different building techniques and technical systems were used at the different properties. A measurement program including hourly measurements of district heating, …
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A methodology for detailed calculation of illuminance levels and light dimming factors in a room with motorized blinds integrated in an advanced window
… the cooling season, when reduction of internal heat gains due to electric lighting results in a corresponding reduction of cooling energy consumption. This study presents a simulation of an office space with an advanced window with integrated motorized venetian blinds between the panes. The …
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Passive solar energy : modifications of existing masonry walls to improve thermal performance.
… constructed one glazed with a fan to recover heat from the cavity by forced convection, and one unglazed, with no fan. These walls gave small heat gains. The walls behind the glazing were then insulated on their outer faces, and warm air collected by natural convection. Such a collector was …
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Improving energy efficiency in a pharmaceutical manufacturing environment -- production facility
… its office buildings and production facilities. Heating, Ventilation and Air-Conditioning (HVAC) system was identified to be the major energy consumer in the plant. An HVAC specific energy management tool was developed to monitor the energy efficiency and calculate the heat gains and cooling …
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Temperature control strategies for radiant floor heating systems
A dynamic model of a radiant floor heating (RFH) system useful for control analysis is developed. The overall model consists of a boiler, an embedded tube floor slab and building enclosure. The overall model was described by nonlinear differential equations, which were solved using finite numerical …
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Off-peak cooling using phase change material
… with the occupied space, removes sensible heat gains by melting. System components are described by their programmatic requirements. The performance of the proposed off-peak cooling system was simulated under a variety of conditions involving interior zone commercial office spaces. It was …
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Analysis of energy use and carbon emissions from automobile manufacturing
… shows that air exchange causes a significant heating and cooling load at factories. Internal heat gains contribute to the cooling load. We then test various emissions reduction scenarios to see their effectiveness in reducing energy use or emissions. We find that most of the reduction in …
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Cool Roofs for improving thermal performance of existing EU office buildings
… high solar reflectance - which is able to reduce heat gains during daytime - and a high thermal emissivity that enables them to dissipate the heat absorbed throughout the day during night. Despite the concept of cool roofs - i.e. the application of cool materials to roof surfaces - is well known …
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EXPERIMENTAL EVALUATION OF A MULTIFUNTIONAL VARIABLE REFRIGERANT FLOW SYSTEM IN AN EDUCATIONAL OFFICE BUILDING
The top three end uses - space heating, space cooling, and water heating - accounted for close to 41 percent of site energy consumption in U.S. building primary energy consumption. Therefore, energy efficient heating, ventilating and air-conditioning (HVAC) systems in buildings is essential for …
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Building Performance - Methods for Improved Prediction and Verification of Energy Use and Indoor Climate
… methods are: • A method to assess useful solar heat gains in actual buildings during operation. • A method to assess window airing and air leakage in actual buildings during operation. • A method to assess occupancy level in actual buildings during operation. • Methods to generate hourly input …
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Impact of an artifical circulation device on the heat budget of an ice-covered mid-latitude lake
… the impact of artificial circulation on the heat budget of a small mid-latitude ice-covered lake. The heat transfer algorithm developed by Patterson & Hamblin (1988) for high latitude lakes was extended to include the impacts of snowmelt due to rain, sediment heat transfer, snow-ice …
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Characterising Space Use and Electricity Consumption in Non-domestic Buildings
… and the effects of incidental internal gains resulting from its operation. Knowledge of how and where consumption and internal gains occur in buildings is important in understanding the consumption characteristics of the building stock. The overall aim of this research was to improve the …
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INDOOR ENVIRONMENTAL QUALITY (IEQ) AND BUILDING ENERGY OPTIMIZATION THROUGH MODEL PREDICTIVE CONTROL (MPC)
… on future disturbances like weather and internal heat gains to estimate optimal control inputs ahead of time. </p> <p>In this research the major challenges of applying MPC to building systems are addressed. A systematic framework has been developed for ease of implementation. New methods are …
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Vytápění a větrání výrobní a skladové haly
Cílem této diplomové práce je navrhnout systém vytápění a větrání průmyslové a skladové haly a přilehlé administrativní části objektu. Základem návrhu je výpočet tepelných ztrát a tepelných zisků objektu. Návrh systémů má za cíl dosáhnout požadovaného mikroklimatu pro jednotlivé prostory a provozy. …
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Heating, ventilating and air-conditioning system energy demand coupling with building loads for office buildings.
… nondomestic buildings’ total energy consumption. Heating, ventilating and air conditioning (HVAC) systems are the largest energy end use in the nondomestic sector, with energy consumption close to 50% of total energy consumption. Different HVAC systems have different energy requirements when …
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Study of the thermal and optical performance of building integrated Si photovoltaics
… gases and favour the development of the urban heat island phenomenon. Consequently, this significantly motivates the development and implementation of new strategies for energy efficient building design. In the frame of zero-energy buildings, the integration of renewable energy sources along …
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Understanding Thermal Conditions, Thermal Comfort and Adaptive Behaviours in Naturally Ventilated Multi-patient Wards in Connaught Hospital, Freetown, Sierra Leone
… all existing international standards while overheating criteria for naturally ventilated hospital spaces exist only for those located across the temperate zones. The thermal environmental performance assessment in naturally ventilated inpatient facilities in hot-humid settings becomes more …
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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 …