## 1 Introduction  
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. However, 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]. Desiccant cooling systems supply hot dry air to the evaporative cooler. Instead of using electricity to compress the refrigerant, they use heat to regenerate the desiccant [3]. Desiccants can be classified into liquid and solid desiccants. The former are suitable for constructing high-capacity systems [3]. A system employing a solid desiccant can replace a household air-conditioner [4]. Solid desiccants are often manufactured in the form of wheels made of corrugated sheets [5]. For a solar-assisted desiccant cooling system with a solid desiccant, [PERSON] et al. [6] analyzed the amount of sensible and latent heat during the months June, July, and August in Korea. Since the target temperature was set to be moderate (26 \({}^{\circ}\)C), sensible heat removal was similar to latent heat removal [6]. [PERSON] et al. [7] studied a hybrid desiccant cooling system (HDCS) comprising three evaporative coolers and an auxiliary air-conditioner under Pakistani weather conditions. In their experiment, they found that the coefficient of performance increased slightly with ambient temperature. Moreover, they asserted that an HDCS assisted by solar thermal energy can achieve significant energy savings compared with the reheat vapor compression air-conditioning system [7]. [PERSON] et al. [8] showed how the angular speed of a desiccant rotor affects the performance of the desiccant cooling system; the optimal rotation period of the desiccant rotor for the maximum dehumidification decreased when the humidity of the regeneration air decreased, regeneration temperature increased, and velocity of the process air decreased. The cooling capacity of the desiccant cooling system is sensitive to outside air conditions. In humid climates, the cooling system is often equipped with a hybrid system connected to a heat pump [9]. [PERSON] et al. [10] experimentally investigated the performance characteristics of an HDCS for different outdoor conditions in a residential environment for two months. Its cooling capacity was found to be mainly affected by its latent heat removal ability and outdoor humidity [10]. [PERSON] and [PERSON] [11] evaluated thermal comfort conditions when HDCSs were used in residential environments. Thermal comfort conditions can be assessed on the basis of various indicators [12]. [PERSON] and [PERSON] [11] evaluated the ASHRAE comfort zone, predicted mean vote (PMV), and effective draft temperature (EDT). Conditioned spaces were included in the ASHRAE comfort zone under typical Korean summer outdoor conditions. However, both the PMV and EDT were not sufficiently good in certain locations, depending on the supply angle. In [10; 11], an HDCS was used in apartment houses with district heating. In the current study, an HDCS was used in an office building and it was connected to a gas engine CHP system. When the HDCS was used, the indoor environment was outside the ASHRAE comfort zone under certain outdoor conditions. [PERSON] and [PERSON] [13] analyzed the heat balance of a CHP system and discovered that there is room for exhaust heat in the cooling operation mode. The heat required to drive the HDCS in the present system was 14 kW, much less than 100 kW, which is the typical amount of heat recovered from a 100-kWe-class gas engine generator.