Abstract
In a field test of a hybrid desiccant cooling system (HDCS) linked to a gas engine cogeneration system (the latter system is hereafter referred to as the combined heat and power (CHP) system), in the cooling operation mode, the exhaust heat remained and the latent heat removal was insufficient. In this study, the performance of an HDCS was simulated at a humidity ratio of 10 g/kg in conditioned spaces and for an increasing dehumidification capacity of the desiccant rotor. Simulation models of the HDCS linked to the CHP system were based on a transient system simulation tool (TRNSYS). Furthermore, TRNBuild (the TRNSYS Building Model) was used to simulate the three-dimensional structure of cooling spaces and solar lighting conditions. According to the simulation results, when the desiccant capacity increased, the thermal comfort conditions in all three conditioned spaces were sufficiently good. The higher the ambient temperature, the higher the evaporative cooling performance was. The variation in the regeneration heat with the outdoor conditions was the most dominant factor that determined the coefficient of performance (COP). Therefore, the COP was higher under high temperature and dry conditions, resulting in less regeneration heat being required. According to the prediction results, when the dehumidification capacity is sufficiently increased for using more exhaust heat, the overall efficiency of the CHP can be increased while ensuring suitable thermal comfort conditions in the cooling space.
Highlights
IntroductionPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
Combined heat and power (CHP) systems recover exhaust heat from prime movers that generate electricity and use it for heating, which results in a high energy efficiency
The outdoor conditions and the indoor thermal environment were measured with a temperature and humidity sensor (Testo 610), and the measurement accuracy was within 0.5 ◦ C for the temperature and 2.5% for the relative humidity
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Combined heat and power (CHP) systems recover exhaust heat from prime movers that generate electricity and use it for heating, which results in a high energy efficiency. Because the power-to-heat ratio is fixed, energy load fluctuations during the different seasons and periods should be addressed to achieve high efficiency. In summer, when the heating system is not working, high efficiency can be achieved with a trigeneration system that includes a cooling system that uses exhaust heat [1]. Desiccant cooling systems, which are thermally driven cooling systems comprising combined cooling, heat, and power (CCHP) systems, are suitable for small-scale distributed energy systems (with electric power levels below 1 MW) [2]
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