scholarly journals Geothermal heat pumps at Fort Polk: Early results

1996 ◽  
Author(s):  
P.J. Hughes ◽  
J.A. Shonder
Keyword(s):  
Heat Pumps ◽  
Geothermal Heat ◽  
Early Results

Preliminary Feasibility Study of Groundwater Source Geothermal Heat Pumps in Mason County and the American Bottoms Area, Illinois

2014 ◽  
Author(s):  
Xinli Lu ◽  
David R. Larson ◽  
Thomas R. Holm
Keyword(s):  
Ground Surface ◽  
Heat Pumps ◽  
Coefficient Of Performance ◽  
Weather Data ◽  
Single Family ◽  
Geothermal Heat ◽  
Geothermal Heating ◽  
Heating And Cooling ◽  
Groundwater Source ◽  
Mason County

Groundwater source heat pumps exploit the difference between the ground surface temperature and the nearly constant temperature of shallow groundwater. This project characterizes two areas for geothermal heating and cooling potential, Mason County in central Illinois and the American Bottoms area in southwestern Illinois. Both areas are underlain by thick sand and gravel aquifers and groundwater is readily available. Weather data, including monthly high and low temperatures and heating and cooling degree days, were compiled for both study areas. The heating and cooling requirements for a single-family house were estimated using two independent models that use weather data as input. The groundwater flow rates needed to meet these heating and cooling requirements were calculated using typical heat pump coefficient of performance values. The groundwater in both study areas has fairly high hardness and iron concentrations and is close to saturation with calcium and iron carbonates. Using the groundwater for cooling may induce the deposition of scale containing one or both of these minerals.

Energy/Exergy Conversion Factors of Low Enthalpy Geothermal Plants

2021 ◽  
Author(s):  
Henning Francke
Keyword(s):  
Performance Indicator ◽  
Energy System ◽  
Heat Pumps ◽  
Electricity Sector ◽  
Not Given ◽  
Geothermal Heat ◽  
Operation Costs ◽  
Integrated Energy System ◽  
Useful Heat ◽  
Selection Of

Abstract A geothermal heat plant is a not only a source of heat, but, in general, also a sink for relevant amounts of electricity, consumed mainly by the pump(s). This electricity demand is usually not given much attention although being decisive for operation costs, but also offering chances for demand side management as a variable consumer. From the perspective of an integrated energy system, geothermal installations basically move energy from the electricity sector into the heat sector, similar to compression heat pumps. The main heat pump performance indicator is the ratio between invested energy and useful heat, the COP. This paper transfers the COP concept to geothermal sites, by defining and determining the quantity for a selection of mostly German geothermal sites.

Hybrid geothermal heat pumps for cooling telecommunications data centers

2019 ◽  
Vol 188-189 ◽  
pp. 120-128 ◽  
Author(s):  
David P. Zurmuhl ◽  
Maciej Z. Lukawski ◽  
Gloria A. Aguirre ◽  
William R. Law ◽  
George P. Schnaars ◽  
...  
Keyword(s):  
Data Centers ◽  
Heat Pumps ◽  
Geothermal Heat

An Economical Analysis on a Solar Greenhouse Integrated Solar Assisted Geothermal Heat Pump System

2005 ◽  
Vol 128 (1) ◽  
pp. 28-34 ◽  
Author(s):  
Onder Ozgener ◽  
Arif Hepbasli
Keyword(s):  
Heat Pump ◽  
Cooling System ◽  
Heat Pumps ◽  
Renewable Energy Resources ◽  
Ahp Method ◽  
Geothermal Heat ◽  
Pump System ◽  
Heat Pump System ◽  
Economical Analysis ◽  
Geothermal Heat Pump

The main objective in doing the present study is twofold, namely (i) to review briefly the utilization of geothermally heated greenhouses and geothermal heat pumps in Turkey, since the system studied utilizes both renewable energy resources and (ii) to present the Analytical Hierarchy Process (AHP) as a potential decision making method for use in a greenhouse integrated solar assisted geothermal heat pump system (GISAGHPS), which was installed in the Solar Energy Institute of Ege University, Izmir, Turkey. This investigation may also be regarded as the one of the limited studies on the application of the AHP method to GISAGHPs, as no studies on the GISAGHPS have appeared in the literature. In this context, an economic analysis is performed based on the life cycle costing technique first. The results are then evaluated by applying the AHP method to a study, which is a comparative study on the GISAGHPS and split system. The results indicated that the GISAGHPS is economically preferable to the conventional split heating/cooling system under Turkey’s conditions.

scholarly journals Jets, bubbles, and heat pumps in galaxy clusters

2019 ◽  
Vol 489 (2) ◽  
pp. 1939-1949 ◽  
Author(s):  
Yi-Hao Chen ◽  
Sebastian Heinz ◽  
Torsten A Enßlin
Keyword(s):  
Galaxy Clusters ◽  
Thermal Conduction ◽  
Heat Pumps ◽  
Maximum Efficiency ◽  
Heating Process ◽  
Geothermal Heat ◽  
Geothermal Heat Pump ◽  
Direct Energy ◽  
Magnetohydrodynamic Simulations ◽  
Low Entropy

Abstract Feedback from active galactic nucleus (AGN) jets has been proposed to counteract the catastrophic cooling in many galaxy clusters. However, it is still unclear which physical processes are acting to couple the energy from the bi-directional jets to the intra-cluster medium (ICM). We study the long-term evolution of rising bubbles that were inflated by AGN jets using magnetohydrodynamic simulations. In the wake of the rising bubbles, a significant amount of low-entropy gas is brought into contact with the hot cluster gas. We assess the energy budget of the uplifted gas and find it comparable to the total energy injected by the jets. Although our simulation does not include explicit thermal conduction, we find that, for reasonable assumptions about the conduction coefficient, the rate is fast enough that much of the uplifted gas may be thermalized before it sinks back to the core. Thus, we propose that the AGN can act like a geothermal heat pump to move low-entropy gas from the cluster core to the heat reservoir and will be able to heat the inner cluster more efficiently than would be possible by direct energy transfer from jets alone. We show that the maximum efficiency of this mechanism, i.e. the ratio between the conductive thermal energy and the work needed to lift the gas, ξmax, can exceed 100 per cent. While ξ < ξmax in realistic scenarios, AGN-induced thermal conduction has the potential to significantly increase the efficiency with which AGN can heat cool-core clusters and transform the bursty AGN activities into a smoother and enduring heating process.

scholarly journals Geothermal air conditioning: typical applications using deep-warm and shallow-cool reservoirs for cooling in Perth, Western Australia

2014 ◽  
Vol 5 ◽  
pp. A10
Author(s):  
Peter B. Whittaker ◽  
Xiaolin Wang ◽  
Klaus Regenauer-Lieb ◽  
David Blair ◽  
Hui Tong Chua
Keyword(s):  
Western Australia ◽  
Alternative Energy ◽  
Cooling Water ◽  
Geothermal Gradient ◽  
Heat Pumps ◽  
The Other ◽  
Plate Boundaries ◽  
Climate Control ◽  
Geothermal Heat ◽  
Heating And Cooling

Geothermal heat is a sustainable form of alternative energy, commonly associated with the production of electricity along tectonic plate boundaries and in volcanically active zones. Outside of these special regions however it is rare to find a geothermal gradient high enough to achieve pay back on projects for generating electricity. On the other hand regions containing sedimentary aquifers are far more common and these aquifers frequently have a sufficiently high temperature gradient to make direct use of the thermal energy attractive. Meanwhile highly permeable aquifers occurring at shallow depths are possible sources for cooling water or can be both heat sources and sinks when used in combination with heat pumps. We provide a case study for the use of thermally driven absorption chillers on the University of Western Australia campus in Perth and discuss two ongoing projects: one for the heating and cooling of the offices of the Australian Resources Research Council using a reversible heat pump and the other the climate control of the planned Australian International Gravitational Observatory.

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