Performance investigation of a hybrid ground-assisted desiccant cooling system

Liang, Jyun-De; Kao, Chia-Lin; Tsai, Lu-Kuan; Chiang, Yuan-Ching; Tsai, Hsieh-Chen

doi:10.1016/j.enconman.2022.115765

Cited by 15 publications

(2 citation statements)

References 33 publications

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“…The main challenges that desiccant-aided contemporary air conditioning systems must overcome to get wider acceptance in space cooling include a further increase in energy utilization rate, decrease in cost and size, competitive design, and manufacturing [70][71][72][73][74].…”

Section: Performance Analysismentioning

confidence: 99%

Review on Performance Analysis of Desiccant-Assisted Hybrid Cooling Systems

Jani¹

2022

Glob. J. Energ. Technol. Res. Updat.

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Due to the growing expense of fossil fuels and other environmental issues, it is crucial to reduce the energy cost of built environment cooling systems without sacrificing indoor air quality and comfort levels. One option in this area is solid desiccant dehumidification-assisted cooling systems, which employ alternative energy sources like solar and biomass and are also environmentally beneficial by the minimal requirement of refrigerants. The present review discusses the performance analysis of different solid desiccants readily accessible on the market and their composites. Better moisture absorption and a lower regeneration temperature are qualities of a better desiccant. The review also discusses the various solid desiccant dehumidifier designs, their benefits, and their disadvantages. Solid desiccant dehumidifiers now come in various combinations, considerably enhancing system performance. The exergy efficiency of desiccant-integrated evaporative cooling is up to 21.5%, comparable with another HVAC system. A summary of the performance parameters has also been created to assess system performance further. This study will benefit innovation and advancement in solid desiccant materials in the air conditioning market.

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Section: Performance Analysismentioning

confidence: 99%

Review on Performance Analysis of Desiccant-Assisted Hybrid Cooling Systems

Jani¹

2022

Glob. J. Energ. Technol. Res. Updat.

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“…Previous investigations on hybrid cooling systems involving desiccant systems include heat pump-assisted desiccant cooling [6,24], ground assisted desiccant cooling [25], desiccant based ejector cooling [26] and PCM integrated desiccant cooling [27]. However, the proposed system is different from systems in the literature as this system combines a solid desiccant dehumidifier with a conventional cooling coil integrated with the cooling tower of an existing chiller system and this is first of its kind in the available literature.…”

Section: Introductionmentioning

confidence: 99%

Energy and Comfort Evaluation of Fresh Air-Based Hybrid Cooling System in Hot and Humid Climates

2022

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Maintaining mechanical ventilation has been identified as a potential strategy for reducing the risk of virus infections. However, in hot and humid climatic conditions, delivering fresh air to a building comes at an energy cost and could impact occupant comfort due to the persistent need for simultaneous cooling and dehumidification. In this paper, the performance of a novel hybrid air conditioning system that handles fresh air is studied. In this system, dehumidification is accomplished by a solid desiccant dehumidifier coupled with a cooling coil integrated with the cooling tower of an existing chiller system. Using the data available from an operational desiccant cooling system, a system-level model has been developed and validated to study the potential application of the system in hot and humid climates. The study found that such a system is effective in delivering sensible cooling in all types of climates; thanks to the two-stage cooling in cooling coil and chilled water coils, respectively. However, the system is effective in delivering thermal comfort in regions where the climate has a relatively moderate ambient humidity. For the tropical cities of Darwin, Kuala Lumpur and Bangkok, the system can provide comfortable temperatures, but faces challenges in keeping the humidity within the comfort zone. The system electrical coefficient of performance (COP) is higher than that of refrigerative systems. This system also has the benefit over the refrigerative system of the supply air, which is entirely fresh ambient air and is expected to improve the indoor environmental quality largely.

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Performance study on a hybrid solid desiccant‐vapor compression air‐conditioning system for hot‐humid ambient conditions

Venkatesh,

Ganesh,

Rudramoorthy

2024

Heat Trans

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The paper focuses on the simulation and testing of a hybrid solid desiccant‐vapor compression air‐conditioning system under different hot‐humid climates. The simulation is carried out by a BLUEJ programming framework. Air at the lowest achievable temperatures from a solid desiccant cooling system is supplied to a standard vapor compression air‐conditioning system (VCAS). The cooling capacities of the hybrid system under three modes 1, 2, and 3, indicating different supply air conditions to the cabin, are reported in the paper. This paper expresses the trade‐off between having comfort conditions and reasonable comfort conditions inside the cooling space with energy efficiency as the inflection point. The more the study is moved towards the point of energy efficiency, the higher the reduction in the cooling capacities of the vapor compression air conditioner. This is demonstrated by the cooling capacity savings when the system is operated in three modes namely 1, 2, and 3. The substantial energy savings provided by Mode 1, Mode 2, and Mode 3 are 71%, 57%, and 37%, respectively. If the system is made to provide substantial cooling and focuses deeply on cooling capacity savings, then the system could save up to 77% in the cooling capacity of the vapor compression air‐conditioning system. If the system is made to operate solely with the milestone of comfort cooling for the occupants with any substantial savings in the cooling capacity of the vapor compression air‐conditioning system, then Mode 3 would deliver the milestone and give savings in the cooling capacities from 32% to 41% which is a significant savings. From the results of the performance study, it is inferred that the hybrid system provides significant energy savings compared to a standard air conditioner, especially in hot‐humid ambient conditions. The solid desiccant cooling system thus establishes itself as an effective pre‐cooler unit for a VCAS. The hybrid solid desiccant air‐conditioning in the paper is analyzed from the aspects of savings in cooling capacities of an existing vapor compression air‐conditioning system and comfort cooling. This is a newer operational approach, especially for using this hybrid solid desiccant cooling system for ambient humidity ratios greater than 15 kg−1 d.a.

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Performance investigation of a hybrid ground-assisted desiccant cooling system

Cited by 15 publications

References 33 publications

Review on Performance Analysis of Desiccant-Assisted Hybrid Cooling Systems

Review on Performance Analysis of Desiccant-Assisted Hybrid Cooling Systems

Energy and Comfort Evaluation of Fresh Air-Based Hybrid Cooling System in Hot and Humid Climates

Performance study on a hybrid solid desiccant‐vapor compression air‐conditioning system for hot‐humid ambient conditions

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