Energy Performance of a Novel Hybrid Air Conditioning System Built on Gravity-Assisted Heat Pipe-Based Indirect Evaporative Cooler

Krzysztof Rajski, Ali Sohani, Sina Jafari, Jan Danielewicz and Marderos Ara Sayegh
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Krzysztof Rajski: Faculty of Environmental Engineering, Wrocław University of Science and Technology, 50-377 Wrocław, Poland
Ali Sohani: Laboratory of Optimization of Thermal Systems’ Installations, Faculty of Mechanical Engineering-Energy Division, K.N. Toosi University of Technology, No. 15–19, Pardis St., Mollasadra Ave., Vanak Sq., P.O. Box 19395-1999, Tehran 1999-143344, Iran
Sina Jafari: Laboratory of Optimization of Thermal Systems’ Installations, Faculty of Mechanical Engineering-Energy Division, K.N. Toosi University of Technology, No. 15–19, Pardis St., Mollasadra Ave., Vanak Sq., P.O. Box 19395-1999, Tehran 1999-143344, Iran
Jan Danielewicz: Faculty of Environmental Engineering, Wrocław University of Science and Technology, 50-377 Wrocław, Poland
Marderos Ara Sayegh: Faculty of Environmental Engineering, Wrocław University of Science and Technology, 50-377 Wrocław, Poland

Energies, 2022, vol. 15, issue 7, 1-18

Abstract: A hybrid air conditioning system, which is composed of a novel gravity-assisted heat pipe (GAHP)-based indirect evaporative cooler (IEC) and direct expansion (DX) cooling coil, is proposed and investigated here. After developing a mathematical model to describe the performance of the GAHP-based IEC, the hybrid system is evaluated during the cooling design day for providing thermal comfort for an office building in Poland. The results are obtained and compared with the combination of a rotary heat exchanger (RHE) and DX cooling coil as the conventional hybrid system. The comparison is performed by analyzing cooling capacity, electricity consumption, and coefficient of performance profiles, which describe the technical, energy, and efficiency aspects, respectively. The results show that the GAHP-based IEC hybrid system is able to enhance the energy performance significantly compared to the conventional one. The proposed hybrid HVAC system improves COP by 39.2% and reduces electricity consumption by 45.0%, according to the design-day of 24 August and the outdoor temperature of 30 °C. As a result, the total operating cost for the assumed cooling season is reduced by 51.7%.

Keywords: heat and mass transfer; hybrid air condition system; wickless heat pipe; indirect evaporative cooling; energy saving (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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