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Proceedings of the 27th National and 5th International ISHMT-ASTFE Heat and Mass Transfer Conference December 14-17, 2023, IIT Patna, Patna-801106, Bihar, India
December, 14-17, 2023, Bihar, India

Radiant Air-Cooling Strategies for Medium Scale Buildings using Vapour Absorption and Cooling Towers

Get access (open in a dialog) DOI: 10.1615/IHMTC-2023.360
pages 215-220


The motivation of the presented study is to establish a criterion for commercial building cooling systems based on radiant air-cooling (RAC) methodology. Since the RAC requires a dedicated outdoor air system (DOAS) for fresh air purpose, so two chillers are always needed. For the DOAS chiller, compression-driven arrangement is preferable, whereas, for the radiant chiller, absorption chiller may be used. For minimizing electric grid dependency, the feasibility of substituting the absorption chiller with cooling tower has been assessed for a medium scale corporate building subjected to composite meteorological conditions. Appraisal of systems' performance is gauged in terms of electrical energy consumed, coefficient of performance (CoP), room air temperature and moisture content, and the number of unfulfilled hours. EnergyPlus simulated results portray that solar energy-aided absorption system-aided RAC needs 26.17 % less primary energy than that of the cooling tower-aided RAC, because of extra load on the DOAS chiller. Despite this, thermal load delivered by the cooling tower-aided RAC is lesser, that leads the building to acquire yearly-averaged temperature of nearly 26 °C with satisfactory relative humidity below 50 %. On the other hand, solar energy-aided absorption RAC design yields an averaged relative humidity of nearly 50 %, and offers yearlyaveraged temperature of about 25 °C. As expected, CoP for absorption chiller is lower with respect to the compression chiller because of associated low grade thermal and high grade electrical energies, respectively. However, incorporation of cooling tower marginally improves the CoP of DOAS compression chiller by around 3.37 %. For cooling tower and absorption-based RAC designs, the number of unfulfilled hours is found to be 2.35 % and 4.92 % of the total system operational time. Encouraging scopes of research on building cooling using RAC are envisaged for the future.