Abstract
A hybrid solid desiccant cooling system (SDCS), which combines a solid desiccant system and a vapor compression system, is considered to be an excellent alternative for commercial and residential air conditioning systems. In this study, a solar-assisted hybrid SDCS system was developed in which solar-heated water is used as an additional heat source for the regeneration process, in addition to recovering heat from the condenser of an integrated heat pump. A solar thermal collector sub-system is used to generate solar regeneration water. Experiments were conducted in the typically hot and humid weather of Taichung, Taiwan, from the spring to fall seasons. The experimental results show that the overall performance of the system in terms of power consumption can be enhanced by approximately 10% by integrating a solar-heated water heat exchanger in comparison to the hybrid SDCS system. The results show that the system performs better when the outdoor humidity ratio is large. In addition, regarding the effect of ambient temperature on the coefficient of performance (COP) of the systems, a critical value of outdoor temperature exists. The COP of the systems gradually rises with the increase in ambient temperature. However, when the ambient temperature is greater than the critical value, the COP gradually decreases with the increase in ambient temperature. The critical outdoor temperature of the hybrid SDCS is from 26 °C to 27 °C, and the critical temperature of the solar-assisted hybrid SDCS is from 27 °C to 30 °C.
Highlights
Heating, ventilating and air conditioning (HVAC) systems are designed to maintain specific indoor conditions, which vary depending on the application
solid desiccant cooling system (SDCS), the average temperature declination is in the range of 3.65 ◦ C to 6.79 ◦ C, which gradually increases from April to June and gradually decreases until October
The average specific moisture removal (SMR) value is in the range of 0.0033 kg/kgda to 0.0075 kg/kgda, which gradually rises from April to June declines until October
Summary
Heating, ventilating and air conditioning (HVAC) systems are designed to maintain specific indoor conditions, which vary depending on the application. The results show that the system could provide thermal comfort, the capability of the system to provide suitable air temperature and humidity depends on the performance of the evaporative cooling, energy-recovery, and heat-generation systems. Five control modes based on the temperature and humidity of the outdoor air conditions were designed From their performance analysis, it was pointed out that preheating of the recovered heat for the regeneration process can reduce the required heat from the solar collector by approximately 30%. The chilled water from the adsorption chiller was provided to the radiant cooling coil for handling the sensible heat of the air-conditioned space Both required regeneration heating for the rotary dehumidification wheel and the adsorption chiller supplied by the solar collector. The performance analysis and comparisons of solar-assisted hybrid SDCS, hybrid SDCS and solar SDCS systems were conducted through long-term experiments in order to understand their characteristics and operational ranges in terms of environmental conditions
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