Cooling mode experimental analysis of a direct expansion geothermal heat pump with a control depending on the discharge pressure

This study compared the effects of the cooling mode of a geothermal heat pump (GHP) system with those of a traditional cooling system (ventilation fans) inside a pig house on the internal house temperature, harmful gas emissions, and the growth performance of the pigs. During the 19-week experimental period, the temperature inside the house connected to the GHP cooling system was significantly lower (p < 0.05) than that of a house with a conventional cooling system. Similarly, the temperature–humidity index (THI) was significantly reduced (p < 0.05) in the GHP cooling system-connected pig house. Furthermore, the concentrations of ammonia (NH3) and hydrogen sulfide (H2S) were also decreased significantly in the GHP-installed pig house (p < 0.05). However, no differences were observed in the concentrations of particulate matter (PM2.5) and formaldehyde (p > 0.05). The pigs reared in the GHP-equipped pig house gained significantly more weight (p < 0.05) by the end of the experiment. The GHP cooling system can therefore be implemented as a renewable, environmentally friendly energy source in pig farms for sustainable swine production without adversely affecting the productivity parameters.

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5564282 Variable capacity staged cooling direct expansion geothermal heat pump

Geothermics ◽

10.1016/s0375-6505(97)88518-5 ◽

1997 ◽

Vol 26 (3) ◽

pp. 433

Keyword(s):

Heat Pump ◽

Direct Expansion ◽

Geothermal Heat ◽

Variable Capacity ◽

Geothermal Heat Pump

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Experimental analysis of a self consumption strategy for residential building: The integration of PV system and geothermal heat pump

Renewable Energy ◽

10.1016/j.renene.2015.09.030 ◽

2016 ◽

Vol 86 ◽

pp. 1075-1085 ◽

Cited By ~ 50

Author(s):

Alessandro Franco ◽

Fabio Fantozzi

Keyword(s):

Heat Pump ◽

Experimental Analysis ◽

Residential Building ◽

Pv System ◽

Geothermal Heat ◽

Geothermal Heat Pump

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Energy and exergy investigation of a carbon dioxide direct-expansion geothermal heat pump

Applied Thermal Engineering ◽

10.1016/j.applthermaleng.2017.10.022 ◽

2018 ◽

Vol 129 ◽

pp. 165-178 ◽

Cited By ~ 14

Author(s):

Hossein Ghazizade-Ahsaee ◽

Mehran Ameri

Keyword(s):

Carbon Dioxide ◽

Heat Pump ◽

Direct Expansion ◽

Geothermal Heat ◽

Energy And Exergy ◽

Geothermal Heat Pump

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Modeling and Experimental Validation of a Transient Direct Expansion Heat Pump

International Journal of Renewable Energy Development ◽

10.14710/ijred.6.2.145-155 ◽

2017 ◽

Vol 6 (2) ◽

pp. 145 ◽

Cited By ~ 1

Author(s):

Clément Rousseau ◽

Jean-Louis Comlan Fannou ◽

Louis Lamarche ◽

Stanislaw Kajl

Keyword(s):

Heat Pump ◽

Experimental Validation ◽

Heat Extraction ◽

Direct Expansion ◽

Geothermal Heat ◽

Transient Model ◽

Ground Source ◽

Geothermal Heat Pump ◽

Pump Modeling ◽

Heating Mode

Geothermal heat pump technology is currently one of the most interesting technologies used to heat buildings. There are two designs used in the industry: geothermal heat pump using a secondary ground loop and Direct Expansion (DX) ground source heat pump. The latter is less used, possibly because less research has been carried out for the design of this kind of heat pump. In this paper, a transient model using the Comsol Multiphysic of a DX ground heat pump is presented in heating mode with R22, and a comparison with experimental results is presented with a 24-hour test. It is shown that the model was adequately validated by our experiment with only a maximum difference of 15%. Following this validation, a parametric analysis was realised on the geometry of the borehole. This study concluded that to have the best heat extraction of the ground, the pipes shank spacing need to be important without increasing the borehole diameter.Keywords: Direct Expansion geothermal heat pump, Modeling, R22Article History: Received January 16th 2017; Received in revised form May 28th 2017; Accepted June 6th 2017; Available onlineHow to Cite This Article: Rousseau, C., Fannou, J.L.C., Lamarche, L. and Kajl, S. (2017) Modeling and Experimental Validation of a Transient Direct Expansion Heat Pump. International Journal of Renewable Energy Develeopment, 6(2), 145-155.https://doi.org/10.14710/ijred.6.2.145-155

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