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 69 for “"thermal mass"”.
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Experimental Investigation of Heat Exchange between Thermal Mass and Room Environments
… passive cooling concepts have to rely on a good thermal coupling between a building’s thermal mass and indoor air. In many cases, the ceiling is the only surface remaining for a good coupling. Further research is necessary to investigate discrepancies between existing correlations. Therefore, the …
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Thermal mass applications in the hot‐humid region of Austin, TX
Thermal mass can be successfully implemented in the hot‐humid region of Austin, TX especially when well designed and with supplementary aids like nightcooling and day‐lighting. This study shows that in some situations thermal mass can be actually more beneficial at reducing electricity demands in …
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Methods to achieve wavelength selectivity in infrared microbolometers and reduced thermal mass microbolometers
… both the wavelength selectivity and the speed of thermal response for microbolometers. These patterned resistive sheets and Modified dielectric coated Salisbury Screen are a modified form of classical Salisbury Screens that utilize a resistive absorber layer placed a quarter-wavelength in front of …
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Thermal mass performance in residential construction : an energy analysis using a cube model
… key questions regarding the performance of thermal mass construction. The work presents the Cube Model, a simplified model of the single-family home. The model combines simplified geometry and equivalent envelope parameters with accurate climate data and internal loading assumptions. The …
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Predictive pre-cooling control for low lift radiant cooling using building thermal mass
… hydronic distribution, radiant cooling, thermal energy storage and predictive control to achieve lower condensing temperatures, higher evaporating temperatures, and reductions in instantaneous cooling loads by spreading the daily cooling load over time. The LLCS studied in this research …
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Assessment of thermal mass property for energy efficiency and thermal comfort in concrete office buildings
… technology is facing the prospect of its massive growth in the building sector worldwide. In addition to its positive structural characteristics, concrete has an inherent thermal mass feature that is known to save heating and cooling energies. However, such benefits need to be quantified …
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Climate-responsive design for non-domestic buildings in warm climates : optimisation of thermal mass for indoor cooling
… investigation focuses on the study of the thermal inertia of buildings examining the extent to which the envelope and internal components can moderate their internal climate. Especial emphasis is given to the analysis of thermal mass effects in conditions of overheating in buildings with …
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Possibilities of using thermal mass in buildings to save energy, cut power consumption peaks and increase the thermal comfort
… with regard to as energy savings, better thermal indoor climate, and reduced peak powers. This could include buildings that can function without energy input during cold periods, buildings that give a robust indoor climate without installed cooling, and buildings with good thermal comfort …
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Material impacts on operational energy usage
… focuses on concrete structures and how the thermal mass and the thermal resistivity influence energy usage. The investigation was done looking at large commercial office buildings in the climates of Phoenix and Chicago. A comparison was conducted between a steel frame and concrete frame …
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Transition dynamics between the multiple steady states in natural ventilation systems : from theories to applications in optimal controls
… single-zone systems to complex systems with thermal mass. More importantly, we found that the system can transform from one steady state to another under sufficient perturbations (disturbances) when multiple steady states exist. A successful transition is determined by both the magnitudes and …
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Experimental investigation of building envelope and air source heat pumps in Canadian cold climate
… reveal a strong correlation between a) the thermal performance of the building envelope and the ASHP efficiency, b) the effect of wind speed and the convective heat transfer coefficient, c) the solar irradiance and the thermal mass of the wall, and d) the ASHP efficiency with the thermal …
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Parametric Analysis and Life Cycle Cost Assessment for Optimizing PCM Application in Exterior Walls in the Kingdom of Saudi Arabia
… use. This is largely caused by uninsulated thermal mass and subsidized electricity rates. In addition, Vision 2030's housing projects and labor shortage necessitate alternatives to current housing standards. Modular housing offers a solution to the labor shortage, but its success depends on …
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MASS BALANCE: Design strategies for lightweight, thermally massive construction systems
The design of lightweight, thermally massive construction systems offers the opportunity to tackle two of the main challenges currently facing the built environment: the need to reduce the use of concrete, responsible for 5-8% of global carbon emissions, and the mitigation of the impacts of extreme …
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High energy density entrainment-based catalytic micro-combustor for portable devices in extreme environmental conditions
… to optimize the heat transfer between the high thermal mass and combustor at the insulating mica sheet stack interface. Afterwards, through independent testing, we established the micro-combustor’s ability to maintain long-term autothermal combustion at a high saturation wall temperature …
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A study of the transwall system as a multi-use architectural element
… These architectural uses are: (1) an adjustable thermal mass; (2) a passive cooling device; (3) an interior design element; (4) a component of a convertible greenhouse and living space; and (5) a shading device.
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Urban solarium : thermal performance in Boston
… issue of energy efficiency through the lens of thermal performance in the context of urban housing in the city of Boston. Located in the historic brick row house neighborhood of the South End, the project utilizes brick for its inherent property of high heat capacity - a material's ability to …
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A methodology for thermal analysis and predictive control of building envelope heating systems
… as a building envelope heating system (BEHS). Thermal mass usually integrated with such a heating system can be utilized to lower both peak loads and operating costs and to reduce room temperature swings by predictive control while utilizing solar gains to reduce energy consumption. …
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Scalable 3D carbon nanotube structures for bolometric infrared sensor arrays
… strength, excellent IR absorption, low thermal mass, and are electrically conductive. These properties make CNT structures especially suitable for IR sensing, where the IR absorber and detector in a device can be combined in one element. A common structure for a microbolometer is a thin …
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A Study Of Intermittent Convective Heating Effects On Fine Fuel Ignition
… to cooling effects between pulses and the larger thermal mass of the fuels. The results are discussed and compared with a simple numerical model incorporating measured velocities and temperatures present in the burner and their effect on a thermally-thin fuel element over time.
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Improvements to building energy usage modeling during early design stages and retrofits
… are investigated. These include changes to the thermal mass temperature distribution and lighting requirement calculations, the formulation of a representative day scheme to reduce the number of days that need to be simulated to find energy usage for a full year, the creation of an optimization …
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