A novel design of a desiccant rotary wheel for passive ventilation applications

O’Connor, Dominic; Calautit, John Kaiser; Hughes, Ben Richard

doi:10.1016/j.apenergy.2016.06.029

Cited by 57 publications

(17 citation statements)

References 42 publications

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“…In open system applications (harvesting, desalination, air-conditioning), depending on the humidity level, huge volumes have to be contacted with the MOF ( Figure 5 ) by convective transport with minimum energy penalty. Open structures are proposed with very low pressure drop 29 such as the so-called “three-levels-of-porosity” 30 reactor with regularly arranged spatially packed beds ( Figure 4 a) or internally finned monolithic structures 31 that may have a higher solid inventory.…”

Section: Engineering Aspectsmentioning

confidence: 99%

Water and Metal–Organic Frameworks: From Interaction toward Utilization

2020

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The steep stepwise uptake of water vapor and easy release at low relative pressures and moderate temperatures together with high working capacities make metal–organic frameworks (MOFs) attractive, promising materials for energy efficient applications in adsorption devices for humidity control (evaporation and condensation processes) and heat reallocation (heating and cooling) by utilizing water as benign sorptive and low-grade renewable or waste heat. Emerging MOF-based process applications covered are desiccation, heat pumps/chillers, water harvesting, air conditioning, and desalination. Governing parameters of the intrinsic sorption properties and stability under humid conditions and cyclic operation are identified. Transport of mass and heat in MOF structures, at least as important, is still an underexposed topic. Essential engineering elements of operation and implementation are presented. An update on stability of MOFs in water vapor and liquid systems is provided, and a suite of 18 MOFs are identified for selective use in heat pumps and chillers, while several can be used for air conditioning, water harvesting, and desalination. Most applications with MOFs are still in an exploratory state. An outlook is given for further R&D to realize these applications, providing essential kinetic parameters, performing smart engineering in the design of systems, and conceptual process designs to benchmark them against existing technologies. A concerted effort bridging chemistry, materials science, and engineering is required.

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Section: Engineering Aspectsmentioning

confidence: 99%

Water and Metal–Organic Frameworks: From Interaction toward Utilization

2020

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“…People spent up to 80% of their time indoors [7] and in the industrialized world, energy consumption in the building sector accounts for around 40% of the total world energy demand [8]. This is mainly used to maintain a comfortable temperature inside buildings.…”

Section: Introductionmentioning

confidence: 99%

Energetic, Economic and Environmental (3E) Assessment and Design of Solar-Powered HVAC Systems in Pakistan

et al. 2020

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Rapid urbanization, global warming and enhanced quality of life have significantly increased the demand of indoor thermal comfort and air conditioning systems are not a luxury anymore, but a necessity. In order to fulfil this need, it is imperative to develop affordable and environmentally friendly cooling solutions for buildings. In this work, the 3E performance (energetic, economic and environmental) of electrically driven water-cooled vapour compression systems and thermally (solar) driven vapour absorption cooling systems are evaluated and the parameters affecting the performance of solar-driven vapour absorption systems are investigated. The energy simulation software TRNSYS is used to simulate the performance of both systems in order to fulfil the cooling needs of an industrial manufacturing building for the typical climate conditions for Lahore, Pakistan. Primary energy saving, initial investment, operational cost, and carbon footprint indices are used to analyse the performance of both systems. In addition, a parametric code is written in Python and linked with TRNSYS to perform a parametric study to investigate the effects of various parameters such as solar field size, storage tank volume, optimum annual and monthly collector angles, and flow rate in the solar field on the solar-driven vapour absorption chiller performance. The results reveal that around 5% more energy can be absorbed per collector surface area by changing the solar tilt angle on a monthly basis compared to one fixed angle. The analysis shows that electrically driven vapour compression-based cooling systems have much higher running cost and are potentially hazardous for the environment but have lower capital costs. On the other hand, solar thermal systems have lower running costs and emissions but require further reductions in the capital costs or government subsidies to make them viable.

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“…Pressure drop is one of the problems of sinusoidal channels. To overcome this problem, Connor and coworkers redesigned the traditional honeycomb matrix structure by incorporating a radial blade extending out from the center of the wheel to the periphery of the wheel resulting in a very low value of pressure drop.…”

Section: Introductionmentioning

confidence: 99%

Parametric analysis of desiccant wheel for air conditioning application

Yadav

2018

Heat Trans. Asian Res.

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A one-dimensional mathematical model is developed to evaluate the operating and design parameters of the desiccant wheel for air conditioning application. In this paper, dehumidification coefficient of performance (DCOP) and sensible energy ratio (SER) are adopted as a combined performance index to reflect the dehumidification and thermal performance of the desiccant wheel. The analysis of the results reveals that for lower SER, suitable wheel length, wall thickness, channel pitch, and channel height should be 100 mm, 0.2 mm, 3 mm, and 5 mm, respectively. These design parameters have been analyzed under different operating conditions and it was found that for higher DCOP, rotational speed, regeneration temperature, process and regeneration velocity should be 20 rph, 60 • C, and 2 m/s. K E Y W O R D S DCOP, design parameters, operating parameters, sensible energy ratio Nomenclature: , channel height (m); csdl , cross-sectional area of the desiccant layer (m 2 ); csf , [m 2 ] cross sectional area of flow passage of one channel; , [m] pitch of the channel; p , (J/kg K) specific heat at constant pressure; c pw , (J/kg K) specific heat of liquid water; pm , (J/kg K) specific heat of substrate (matrix material); D, [m] diameter of desiccant wheel; ℎ fg , [J/kg] latent heat of vaporization; ℎ m , [kg/m 2 s] mass transfer coefficient;ℎ, [W/m 2 K] convective heat transfer coefficient; , [W/m K] thermal conductivity; , [m] wheel length; MR, [kg kg −1 ] moisture removal; [Pa], pressure; f , [m] perimeter of the flow passage of one channel; , [Pa] pressure drop; ad , [J/kg adsorbate] heat of adsorption; , [Sec] time; , [K] temperature; , [m/s] velocity; , [kg adsorbate kg adsorbent −1 ] water content in desiccant; , axial direction; , [kg kg −1 ] humidity ratio of the air Greek symbols: , [kg/m 3 ]

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A novel design of a desiccant rotary wheel for passive ventilation applications

Cited by 57 publications

References 42 publications

Water and Metal–Organic Frameworks: From Interaction toward Utilization

Water and Metal–Organic Frameworks: From Interaction toward Utilization

Energetic, Economic and Environmental (3E) Assessment and Design of Solar-Powered HVAC Systems in Pakistan

Parametric analysis of desiccant wheel for air conditioning application

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