Free Cooling Energy from the Ground

A very good practice is to directly cooling the building using the soil as cold thermal source. This mechanism is known as free ground cooling (FGC). It can be easily implemented in GCHPs, only circulating the fluid through the GHX and by passing the heat pump. V-GHXs are preferred for FGC applications, since soil temperatures are lower at deep depths in summer, when cooling energy is generally required. Indeed, FGC effectiveness depends on the inlet set point temperature of the indoor cooling energy distribution system. It increases incrementing the inlet set point temperature. Thus, for very low inlet temperatures FGC is not applicable. When applicable, building space cooling (SC) requirements can be satisfied only consuming a small amount of electricity (Wang et al. 2010; Wu et al. 2014). This makes FGC technique worth of investigation in the design phase of GCHPs, although not all the locations are suitable for FGC application.

References

Badache M, Eslami-Nejad P, Ouzzane M, Aidoun Z, Lamarche L (2016) A new modeling approach for improved ground temperature profile determination. Renew Energy 85:436-444. doi:10.1016/j.renene.2015.06.020

Chwieduk DA (2012) 3.15—Solar-assisted heat pumps. In: Comprehensive renewable energy, pp 495-528

Emmi G, Zarrella A, De Carli M, Galgaro A (2015) An analysis of solar assisted ground source heat pumps in cold climates. Energy Convers Manag 106:660-675. doi:10.1016/j.enconman. 2015.10.016

Girard A, Gago EJ, Muneer T, Caceres G (2015) Higher ground source heat pump COP in a residential building through the use of solar thermal collectors. Renew Energy 80:26-39. doi:10.1016/j.renene.2015.01.063

Hakkaki-Fard A, Eslami-Nejad P, Aidoun Z, Ouzzane M (2015) A techno-economic comparison of a direct expansion ground-source and an air-source heat pump system in Canadian cold climates. Energy 87:49-59. doi:10.1016/j.energy.2015.04.093 IEA Heat Pump Centre (2010) Ground-source heat pumps - overcoming market and technical IEA heat pump programme

Jean-Christophe Hadorn (2016) Solar and heat pump systems for residential buildings. In: Wiley.

http://eu.wiley.com/WileyCDA/WileyTitle/productCd-3433030405.html. Accessed 14 Feb 2016 Kharseh M, Altorkmany L, Al-Khawaja M, Hassani F (2015) Analysis of the effect of global climate change on ground source heat pump systems in different climate categories. Renew Energy 78:219-225. doi:10.1016/j.renene.2015.01.017 Ochs F, Carbonell D, Haller M (2012) Models of sub-components and validation for the IEA SHC Task 44/ HPP Annex 38 Part B : Collector Models IEA solar heating and cooling programme Rinne S, Syri S (2013) Heat pumps versus combined heat and power production as CO2 reduction measures in Finland. Energy 57:308-318. doi:10.1016/j.energy.2013.05.033 Wang X, Zheng M, Zhang W, Zhang S, Yang T (2010) Experimental study of a solar-assisted ground-coupled heat pump system with solar seasonal thermal storage in severe cold areas. Energy Build 42:2104-2110. doi:10.1016/j.enbuild.2010.06.022 Wu W, You T, Wang B, Shi W, Li X (2014) Evaluation of ground source absorption heat pumps combined with borehole free cooling. Energy Convers Manag 79:334-343. doi:10.1016/j. enconman.2013.11.045

 
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