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 25 for “"Air source"”.
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Design of a residential air source heat pump for extremely cold climates
Air source heat pumps are energy efficient systems suitable for space heating applications, however, their performance drastically degrades in low ambient temperatures. An innovative design is proposed in this thesis that can switch operating modes to allow efficient heating operation in an ambient …
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Design and Lab Implementation of an Air Source Transcritical CO2 Heat Pump
<p>A laboratory-scale air-source transcritical CO2 heat pump (TCHP) was developed to evaluate the performance of low-global-warming-potential (GWP) refrigerants for cold climate applications. A custom climate chamber was also constructed to simulate winter weather conditions typical of the …
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Experimental investigation of building envelope and air source heat pumps in Canadian cold climate
… is used for space heating, yet the adoption of air-source heat pumps (ASHPs) is slower compared to the global average despite their high efficiency and potential for building electrification. This slow adoption is partly due to the low efficiency of ASHPs in cold climates. This study …
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Design, Testing And Controls For Air Source Heat Pump System In Cold Climates Using Natural & Conventional Refrigerants
… Among different types of heat pumps, the Air Source Heat Pump (ASHP) system is widely used due to the easy installation and energy efficiency. Conventional heat pump technologies use various types of hydrofluorocarbons (HFC) refrigerants which are also responsible for greenhouse gas …
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Modeling Air Source Heat Pump Adoption Propensity and Simulating the Distribution Level Effects of Large-Scale Adoption
… For the heating sector in particular, air source heat pump (ASHP) technology presents a promising avenue for decarbonization – especially for residential customers. ASHPs present the lowest carbon emissions heating option for customers in New England today, and are expected to only …
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Analysis of Energy Savings and Feasibility of Retrofitting New York City Midrise Multifamily Buildings with Air Source Heat Pump Technology
… objective of this study is to explore various air source heat pump (ASHP) technologies and configurations that could feasibly replace fossil fuel heating and water heating systems for NYC midrise multifamily buildings using case study approach. Using insights from an existing building that …
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Proposed Design for a Coupled Ground-Source Heat Pump/Energy Recovery Ventilator System to Reduce Building Energy Demand
… a residential building by using a coupled ground-source heat pump/energy recovery ventilation (GSHP-ERV) system to present a novel approach to space condition and domestic hot water supply for a residence. The proposed system is capable of providing hot water on-demand with a high coefficient of …
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The effect of boundary layer blowing in the corner region of a linear compressor cascade wind tunnel
… ends of a set of cascade blades, and an external air source was used as the blade slot jet air source. Tests were done for 19, 21, and 23 degrees angle of attack. The main effect of corner boundary layer blowing was a significant reduction in total pressure losses in the region along the blade …
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Fossil fuel impact of buildings electrification in New York City
… systems to more efficient technologies, such as air-source heat pumps. Moreover, this challenging goal relies also on a much cleaner grid with the majority of electrical generation being provided by renewable sources, such as solar and wind. In this regard, building electrification is being …
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Improving cold climate performance of heat pumps using market-available systems
Air source heat pumps are an excellent electric alternative to fossil fuel based heating systems for reducing residential greenhouse gas (GHG) emissions, but common mild climate systems suffer significant performance losses at the low outdoor temperatures experienced in cold climates. Improved heat …
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Energy Performance and Economic Evaluations of the Geothermal Heat Pump System used in the KnowledgeWorks I and II Buildings, Blacksburg, Virginia
Heating, Ventilating and Air Conditioning Systems (HVAC) are not only one of the most energy consuming components in buildings but also contribute to green house gas emissions. As a result often environmental design strategies are focused on the performance of these systems. New HVAC technologies …
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Performance of an air-to-air heat pump heating and recovery unit at high ventilation rates
… and performance studies of a prototype combined air source heat pump and storage system, retro fitted to heat occupied spaces subjected to high ventilation rates. The source of heat is from the air in the extract duct. Two limiting thermal conditions exist. The first is the thermal capacity of …
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CO₂ and public health impacts of US residential heating electrification
… premature mortalities annually due to degraded air quality. Replacement of this combustion heating with electric heating is expected to reduce these impacts by shifting emissions away from population centers to electric generators. However, these benefits have not been assessed. This thesis …
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Clean heat at what cost? Economic optimization of residential space heating in Massachusetts
… the results of our modeling suggest that air-source heat pumps are significantly costlier to operate for primary space heating relative to high-efficiency natural gas furnaces and boilers under current electricity and natural gas rates. Making heating electrification economic for …
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Investigation of gas engine driven heat pump systems
… are compatible. A problem common •to all air source heat pumps is the formation of frost on the evaporator, which must be removed periodically, with the expenditure of energy, to ensure the continued operation of the plant. An original fluidised bed defrosting mechanism is proposed, which …
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On the Understanding of the Coastal-Urban Nexus of Weather, Air Quality and Energy
… processes, building energy consumption, and air quality, particularly during periods of seasonal extremes such as summer ozone peaks and winter heating. Accurate representation of these interactions in urban modeling is crucial for understanding and addressing air pollution and energy …
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Impact of heat exchanger surface wettability on condensation, frosting, and defrosting performance under practical testing conditions
… major challenges for heating, ventilation, air conditioning, and refrigeration (HVAC&R) systems. Both phenomena increase thermal resistance and airflow restriction, which diminish heat transfer, lower system capacity, and drive up energy consumption. In air-source heat pumps (ASHPs) and …
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The power-gas demand impacts and regulatory implications for the future of gas systems under the electrification of space heating in cold climates
… of heating, especially via efficient air-source heat pumps coupled with a low-carbon electricity grid, is considered an attractive option for displacing emissions from fossil-fueled heating systems. While the opportunity for decarbonization is high in emission-intensive housing stocks …
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Dynamic Modeling and Model-Free Real-Time Optimization for Cold Climate Heat Pump Systems
Air source heat pump (ASHP) has been a well-received technology to provide space and/or water heating for building and industrial applications, while its efficiency and heating capacity can be severely limited when operated in cold climate. Various modifications have been proposed for cold-climate …
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