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 107 for “"Heat Pumps"”.
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Comparative study of advanced heat pumps
… thermal resistances between the device and the heat rejection or heat absorption space. A cool side temperature difference between 0 and 20{dollar}\sp\circ{dollar}C is investigated, and this temperature difference accounts for both thermal resistance and cooling load. An outside temperature …
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Gas engines for domestic engine-driven heat pumps
… engine designed for use as a domestic heat pump prime mover. In light of the application, fuel type and capacity, both experimental and theoretical study of similar engines is at best poorly documented in the literature. A comprehensive engine test facility has been set up, …
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Metal Hydride Heat Pumps for Thermal Management of Devices
… energy densities which makes metal hydride heat pumps (MHHPs) particularly efficient devices. Further, a metal hydride heat pump (MHHP) can be tuned to cover a wide range of temperatures. Most phase change materials (PCMs) have a fixed phase change temperature, but metal hydrides are more …
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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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Feasibility study of heat pumps for waste heat recovery in industry
… to assess the feasibility of implementing the heat pump for waste heat recovery. Through analysis, the focus was narrowed down from a site wide audit, to a departmental breakdown and then eventually to a specific process; the wort boiler. Three different alternatives were investigated and the …
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The Effect of Geothermal Heat Pumps on Subsurface Flow and Contaminant Transport
Geothermal or ground source heat pumps (GSHPs) are among the growing renewable energy technologies used for heating and cooling of buildings. However, little work has been done to investigate their geo-environmental effects within the subsurface. This research uses FEFLOW software, to simulate heat …
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Multi-Level process integration of heat pumps in a non-continuous processing site
Industrial process heat demands contribute significantly to New Zealand’s greenhouse gas emissions. With a global push towards decarbonization, including New Zealand’s Climate Change Response Amendment Act 2019, there is a need for methods and technologies that can be applied to replace industrial …
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Experimental investigation of building envelope and air source heat pumps in Canadian cold climate
… than 60% of residential energy 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 …
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Fault Detection And Diagnosis For Air Conditioners And Heat Pumps Based On Virtual Sensors
… with low cost sensors for air conditioning and heat pump equipment. Automated fault detection and diagnostics (FDD) has the potential for improving energy efficiency along with reducing service costs and comfort complaints. To achieve this goal, virtual sensors with low cost measurements and …
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Solar Colletors Combined with Ground-Source Heat Pumps in Dwellings - Analyses of System Performance
The use of ground-source heat pumps for heating buildings and domestic hot water in dwellings is increasing rapidly in Sweden. The heat pump extracts heat from the ground by a U-pipe in a vertical borehole. In order to reduce the electricity demand in the system, the combination with solar …
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The architectural impact of using ground-source heat pumps in commercial buildings in Las Vegas
… and long term performance of ground-coupled heat pump systems over a fixed period of time. The results are applied to a commercial office building in order to assess the net impact of combining various energy efficiency strategies. The conclusion of the comprehensive study is that energy …
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Market Analysis and Control Design for the Grid Integration of Battery Storage and Heat Pumps
… capabilities; Also, the electrification of heat loads is accelerating the deployment of heat pumps, which can provide additional flexibility through its fast response and connection to large-capacity heating systems. However, these trends also introduce new challenges. The rapid expansion of …
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Assessing the potential of heat pumps to reduce energy-related carbon emissions from UK housing in a changing climate
… of development and analysis of residential heat pump energy use: firstly, the analysis of heat pump performance data from a monitoring study of ground source heat pumps; secondly, the definition and development of a generalised residential heat pump energy model embedded within an enhanced …
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A comparison of ground source heat pumps and micro-combined heat and power as residential greenhouse gas reduction strategies
Both ground source heat pumps operating on electricity and micro-combined heat and power systems operating on fossil fuels offer potential for the reduction of green house gas emissions in comparison to the conventional approaches for providing heating, air conditioning and electric power to …
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