An overview of solid desiccant dehumidification and air conditioning systems

Sultan, Muhammad; El-Sharkawy, Ibrahim I.; Miyazaki, Takahiko; Saha, Bidyut Baran; Koyama, Shigeru

doi:10.1016/j.rser.2015.02.038

Cited by 212 publications

(119 citation statements)

References 92 publications

(164 reference statements)

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“…Lots of industrial processes require particular AC in order to increase the industrial productivity, and it is usually dissimilar to humans' thermal comfort [1]. Intensity of required temperature and humidity control is based on nature of industry and its manufactured products [3].…”

Section: Industrial Processes Acmentioning

confidence: 99%

“…Vapor compression refrigeration cycle is one of the basic and key thermodynamic cycles [43][44][45]. Therefore, it has been well known in the literature and, consequently, millions of refrigeration and heating, ventilation, and air-conditioning (HVAC) units are working worldwide on this conception due to its consistency and higher coefficient of performance (COP) [1]. Basic VAC cycle and its psychrometric representation for heating and cooling processes are expressed in Figure 5.…”

Section: Conventional Ac Systemmentioning

confidence: 99%

“…The word air-conditioning (AC) literally means conditioning of subjected air according to required conditions of air temperature (T a ) and relative humidity (RH) [1]. The AC phenomena usually involve five modes of conditioning, that is, (i) heating, (ii) cooling, (iii) humidification, (iv) dehumidification, and (v) ventilation.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the AC term is mostly associated with humans' thermal comfort as far as conventional literature and primary objectives are concerned [8,9]. Therefore, lots of AC technologies have been established for humans' thermal comfort and are under practice in order to obtain typical conditions of T a and RH, particularly for summer and winter seasons [1,10]. Out of them, most popular and highly efficient systems are based on electric-driven compressors.…”

Section: Introductionmentioning

confidence: 99%

“…Out of them, most popular and highly efficient systems are based on electric-driven compressors. Although compressor-based AC systems achieve desired T a and RH conditions efficiently, these are thermodynamically inefficient and consume huge amount of primary energy [1,10]. Moreover, these systems are based on environmentally harmful technologies and consume hydro-fluorocarbons (HFCs)/chlorofluoro-carbons (CFCs)/hydrochlorofluoro-carbons (HCFCs).…”

Section: Introductionmentioning

confidence: 99%

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Energy-Efficient Air-Conditioning Systems for Nonhuman Applications

Sultan¹,

Miyazaki²

2017

Refrigeration

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In addition to humans' thermal comfort, air-conditioning (AC) could be required for various nonhuman applications, for example, animals' AC, greenhouse AC, food storage and transportation, industrial processes, and so on. In this regard, optimum conditions of air temperature and humidity are explored and compared on psychrometric charts. Thermodynamic limitations of existing AC systems are discussed from the subject point of view. Consequently, four kinds of low-cost energy-efficient AC systems, namely: (i) direct evaporative cooling (DEC), (ii) indirect evaporative cooling (IEC), (iii) Maisotsenko cycle (M-Cycle) evaporative cooling (MEC), and (iv) desiccant AC (DAC), are investigated for climatic conditions of two cities, that is, Multan (Pakistan) and Fukuoka (Japan). In addition, systems' fundamentals and principles are explained by means of schematic diagrams and basic heat/mass transfer relationships. According to the results, performance of all systems is influenced by ambient air conditions; therefore, a particular AC system cannot provide optimum AC for all nonhuman applications. However, one or other AC system can successfully provide desired conditions of temperature and relative humidity. It has been concluded that evaporative cooling systems provide low-cost AC for dry climates, whereas DAC system is found energy efficient and viable for humid climates.

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Section: Industrial Processes Acmentioning

confidence: 99%

Section: Conventional Ac Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Energy-Efficient Air-Conditioning Systems for Nonhuman Applications

Sultan¹,

Miyazaki²

2017

Refrigeration

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Water Adsorption in MOFs: Structures and Applications

Zhang

Zhu

Wang

et al. 2023

Adv Funct Materials

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Metal–organic frameworks (MOFs) are superior sorbents for water adsorption‐based applications. The unique step‐like water isotherm at a MOF‐specific relative pressure allows easy loading and regeneration over a small range of temperature and pressure conditions. With good hydrothermal stability and cyclic durability, it stands out over classical sorbents used in applications for humidity control, water harvesting, and adsorption‐based heating and cooling. These are easily regenerated at moderate temperatures using “waste” heat or solar heating. The isotherm thermodynamics and adsorption mechanisms are described, and the presence of MOFs in the water–air system is explained. Based on six selection criteria ≈40 reported MOFs and one COF are identified for potential application. Trends and approaches in further synthesis optimization and production scale‐up are highlighted. No‐MOF‐fits‐all, each MOF has its own specific step location matching only with a certain application type. Most applications are technically feasible and demonstrated on the bench‐scale or small pilot. Their maturity is benchmarked by their technology readiness level. Retrofitting existing applications with MOFs replacing classical desiccants may lead to rapid demonstration. Studies on techno‐economic analysis and life cycle analysis are required for a rational evaluation of the feasibility of promising applications.

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Epoxy‐Functionalized Porous Organic Polymers via the Diels–Alder Cycloaddition Reaction for Atmospheric Water Capture

Byun

Coskun

2018

Angewandte Chemie

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The synthesis of highly microporous, epoxy‐functionalized porous organic polymers (ep‐POPs) by a one‐pot, catalyst‐free Diels–Alder cycloaddition polymerization is reported. The high oxygen content of ep‐POPs offer efficient hydrogen‐bonding sites for water molecules, thus leading to high water‐uptake capacities up to 39.2–42.4 wt % under a wide temperature range of 5–45 °C, which covers the span of climatic conditions and manufacturing applications in which such materials might be used. Importantly, ep‐POPs demonstrated regeneration temperatures as low as 55 °C, as well as excellent water stability, recyclability, and high specific surface areas up to 852 m2 g−1.

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An overview of solid desiccant dehumidification and air conditioning systems

Cited by 212 publications

References 92 publications

Energy-Efficient Air-Conditioning Systems for Nonhuman Applications

Energy-Efficient Air-Conditioning Systems for Nonhuman Applications

Water Adsorption in MOFs: Structures and Applications

Epoxy‐Functionalized Porous Organic Polymers via the Diels–Alder Cycloaddition Reaction for Atmospheric Water Capture

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