Desiccant-Assisted Air Conditioning System Relying on Solar and Geothermal Energy during Summer and Winter

Peter Niemann, Finn Richter, Arne Speerforck and Gerhard Schmitz
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Peter Niemann: Institute of Engineering Thermodynamics, Hamburg University of Technology, 21073 Hamburg, Germany
Finn Richter: Institute of Engineering Thermodynamics, Hamburg University of Technology, 21073 Hamburg, Germany
Arne Speerforck: Institute of Engineering Thermodynamics, Hamburg University of Technology, 21073 Hamburg, Germany
Gerhard Schmitz: Institute of Engineering Thermodynamics, Hamburg University of Technology, 21073 Hamburg, Germany

Energies, 2019, vol. 12, issue 16, 1-20

Abstract: At Hamburg University of Technology the combination of an open cycle desiccant-assisted air conditioning system and a geothermal system is investigated in the framework of different research projects for several years. The objective of this study is to investigate the energy efficiency of the overall system and to evaluate the geothermal system during summer and winter mode, based on data measured for a temperate climate region. Monitoring results of the performance for dehumidification and remoistening of supply air are presented. Furthermore, the investigated system is compared to reference air conditioning processes. During summer mode, an average dehumidification efficiency of 1.15 is achieved. The electrical energy savings compared to a conventional reference system sum up to 50% for the investigated cooling period. System operation during winter shows an average moisture recovery efficiency of 0.75. The electrical energy demand for air humidification is reduced by 50% compared to a system with electric isothermal air humidification. The geothermal system is operated efficiently throughout the year for cooling and heating application. Besides the energetic system evaluation, measured data regarding the soil temperature and thermal comfort are presented.

Keywords: air conditioning; borehole heat exchanger; desiccant dehumidification; enthalpy recovery; heat pump; system evaluation; experimental (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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