Title: Thermodynamic analysis and assessment of a geothermal cooling system for a house

Authors: Buket Ozcan; Ilkyaz Ekin Aykurt; Melisa Akpak; Tuna Tacer; Nurdan Yildirim; Arif Hepbasli; Huseyin Gunhan Ozcan

Addresses: Department of Energy Engineering, Politecnico Di Milano, 29100, Piacenza, Italy ' Department of Energy Engineering, Politecnico Di Milano, 29100, Piacenza, Italy ' Birim Makina Inc., Halilbeyli OSB. Mah, İzmir Cd. No. 11/2, 35730 Kemalpaşa, Izmir, Turkey ' Department of Energy Systems Engineering, Faculty of Engineering, Yasar University, 35100, Bornova, Izmir, Turkey ' Department of Energy Systems Engineering, Faculty of Engineering, Yasar University, 35100, Bornova, Izmir, Turkey ' Department of Energy Systems Engineering, Faculty of Engineering, Yasar University, 35100, Bornova, Izmir, Turkey ' Department of Energy Systems Engineering, Faculty of Engineering, Yasar University, 35100, Bornova, Izmir, Turkey

Abstract: In this study, a geothermal assisted cooling system with a vapour absorption chiller (VAC) was designed in order to meet the cooling demand of a 140 m² detached single-family house in Izmir, Turkey. In the considered system, the geothermal fluid is transported to the VAC, where water and ammonia are used as an absorbent and a refrigerant, respectively. Energy and exergy analyses methods are utilised to assess the performance of the whole system while some operational properties of the VAC such as pressure, temperature, ammonia concentration and flow rate are determined. Based on the parametric studies, optimum operating conditions of the VAC are obtained to be 30°C, 90°C and 2°C for the condenser, boiler and evaporator, respectively. Under these conditions, the system has a coefficient of performance (COP) value of 0.30 with a simple payback period of 6.4 years, the highest exergy destruction occurs within the absorber with a rate of 38.2%.

Keywords: vapour absorption chiller; VAC; geothermal energy; residential cooling; economic analysis; environmental analysis; exergy analysis.

DOI: 10.1504/IJEX.2019.100370

International Journal of Exergy, 2019 Vol.29 No.2/3/4, pp.350 - 369

Received: 14 Nov 2018
Accepted: 05 Apr 2019
Published online: 27 Jun 2019 *

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