Field study of heat pump-assisted hybrid desiccant cooling system for thermal environment control and energy consumption under different load patterns

Liu, Shuo; Lee, Se-jin; Jeong, Chang-Ho; Yeo, Myoung-Souk

doi:10.1016/j.csite.2022.102170

Cited by 10 publications

(3 citation statements)

References 26 publications

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“…Nevertheless, its applicability is constrained to regions with abundant solar radiation. The incorporation of heating and venting systems to raise the dew point and replace highly humid air is energy-intensive, demanding 0.7 kWh of energy per square meter, equivalent to 20% of a greenhouse’s total energy expenditure …”

Section: Introductionmentioning

confidence: 99%

“…The incorporation of heating and venting systems to raise the dew point and replace highly humid air is energy-intensive, 25 demanding 0.7 kWh of energy per square meter, equivalent to 20% of a greenhouse's total energy expenditure. 26 Implementing a more energy-efficient approach to humidity regulation can significantly reduce the energy consumption associated with agriculture, which currently amounts to as much as 1872 trillion Btu per year in the United States. 27 In recent years, new technologies including functional greenhouse covers and Internet of Things have been developed to enable energy-independent, labor-independent, and high-yield greenhouses.…”

Section: ■ Introductionmentioning

confidence: 99%

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Smart Glazing for Energy- and Cost-Efficient Greenhouse Humidity Regulation

Weng,

Khater,

Paley

et al. 2024

ACS Sustainable Chem. Eng.

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Global food shortage demands significant progress in crop production. Greenhouses offer a solution for higher crop production by providing a controllable environment. Excess levels of humidity, however, encourage pests and diseases, drastically reducing crop yields. Traditional humidity control methods for greenhouses are expensive and energy-intensive. In addition to this, nonbiodegradable plastic covers cause massive white pollution. To tackle these concerns, we present smart glazing and sensors for greenhouse humidity regulation through both passive and active paths. We created biodegradable humidity-sensitive films by blending poly(ethylene glycol) (PEG) with cellulose acetate (CA). PEG/CA covers can automatically open for air circulation at high humidity, successfully demonstrating repeatable greenhouse humidity regulation to as low as 60% relative humidity. PEG/CA-based humidity sensors can actively accelerate air circulation and humidity reduction with repeated cycles at an even higher efficiency. Overall, our research introduces a low-cost, all-in-one, sustainable, and environmentally conscious solution for addressing the greenhouse humidity control challenges. Approximately, this solution can potentially achieve annual energy savings of up to 56.6 GWh for the U.S. if fully applied.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Smart Glazing for Energy- and Cost-Efficient Greenhouse Humidity Regulation

Weng,

Khater,

Paley

et al. 2024

ACS Sustainable Chem. Eng.

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show abstract

“…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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Case studies of a distributed building energy system incorporating with EVs considering effects of random charging behaviors and time-of-use pricing in electricity

Wang

et al. 2022

Case Studies in Thermal Engineering

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Field study of heat pump-assisted hybrid desiccant cooling system for thermal environment control and energy consumption under different load patterns

Cited by 10 publications

References 26 publications

Smart Glazing for Energy- and Cost-Efficient Greenhouse Humidity Regulation

Smart Glazing for Energy- and Cost-Efficient Greenhouse Humidity Regulation

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

Case studies of a distributed building energy system incorporating with EVs considering effects of random charging behaviors and time-of-use pricing in electricity

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