Experimental analysis on the dehumidification and thermal performance of a desiccant wheel

Angrisani, Giovanni; Minichiello, Francesco; Roselli, Carlo; Sasso, Maurizio

doi:10.1016/j.apenergy.2011.11.071

Cited by 141 publications

(37 citation statements)

References 17 publications

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“…Therefore, the convection mechanism is definitively a forced convection. The corresponding heat transfer coefficient is calculated using the following correlation, relating the Nusselt, Reynolds and Prandtl numbers [35]: (8) In this equation the characteristic length is the length of the surface in the wind direction, assumed parallel to the CPVT longitudinal axis, i.e., L tube . The same correlation is used to calculate the heat transfer coefficient for the forced convection between the top absorber and the air, h c,top .…”

Section: Cpvt Simulation Modelmentioning

confidence: 99%

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Parabolic Trough Photovoltaic/Thermal Collectors: Design and Simulation Model

Calise

Vanoli

2012

Energies

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This paper presents a design procedure and a simulation model of a novel concentrating PVT collector. The layout of the PVT system under investigation was derived from a prototype recently presented in literature and commercially available. The prototype consisted in a parabolic trough concentrator and a linear triangular receiver. In that prototype, the bottom surfaces of the receiver are equipped with mono-crystalline silicon cells whereas the top surface is covered by an absorbing surface. The aperture area of the parabola was covered by a glass in order to improve the thermal efficiency of the system. In the modified version of the collector considered in this paper, two changes are implemented: the cover glass was eliminated and the mono-crystalline silicon cells were replaced by triple-junction cells. In order to analyze PVT performance, a detailed mathematical model was implemented. This model is based on zero-dimensional energy balances. The simulation model calculates the temperatures of the main components of the system and the main energy flows Results showed that the performance of the system is excellent even when the fluid temperature is very high (>100 °C). Conversely, both electrical and thermal efficiencies dramatically decrease when the incident beam radiation decreases.

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Section: Cpvt Simulation Modelmentioning

confidence: 99%

“…From this point of view, an interesting application is the desiccant cooling [5][6][7][8]. The selection of the PVT operating temperature is an important key-point in the system design.…”

Section: Introductionmentioning

confidence: 99%

Parabolic Trough Photovoltaic/Thermal Collectors: Design and Simulation Model

Calise

Vanoli

2012

Energies

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“…9 Daou et al 10 reviewed different configurations of the desiccant cooling system (DCS), and La et al 11 pointed out the merits of the solid rotary DCS (known as a desiccant wheel): compactness, continuous working hours, and lower susceptibility to corrosion during operation. To analyze its potential for regeneration using low-grade heat, Angrisani et al 12,13 experimentally investigated the effect of outdoor conditions and regeneration temperature on desiccant wheel performance. Given the promise desiccants offer for more efficient air conditioning, several configurations employing desiccant wheels, such as the combined chilled-ceiling desiccant cooling system, 14 continue to be investigated in the literature.…”

Section: Introductionmentioning

confidence: 99%

Next-generation HVAC: Prospects for and limitations of desiccant and membrane-based dehumidification and cooling

et al. 2017

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Recently, next-generation HVAC technologies have gained attention as potential alternatives to the conventional vapor-compression system (VCS) for dehumidification and cooling. Previous studies have primarily focused on analyzing a specific technology or its application to a particular climate. A comparison of these technologies is necessary to elucidate the reasons and conditions under which one technology might outperform the rest. In this study, we apply a uniform framework based on fundamental thermodynamic principles to assess and compare different HVAC technologies fromGeneration HVAC: Prospects for and Limitations of Desiccant and Membrane-Based Dehumidification and Cooling," Applied Energy, 200:330-346, 15 August 2017.an energy conversion standpoint. The thermodynamic least work of dehumidification and cooling is formally defined as a thermodynamic benchmark, while VCS performance is chosen as the industry benchmark against which other technologies, namely desiccant-based cooling system (DCS) and membrane-based cooling system (MCS), are compared. The effect of outdoor temperature and humidity on device performance is investigated, and key insights underlying the dehumidification and cooling process are elucidated. In spite of the great potential of DCS and MCS technologies, our results underscore the need for improved system-level design and integration if DCS or MCS are to compete with VCS. Our findings have significant implications for the design and operation of next-generation HVAC technologies and shed light on potential avenues to achieve higher efficiencies in dehumidification and cooling applications.

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“…A high pressure drop in the air flow is experienced across devices, typically up to 100Pa depending on the system type and configuration [15]. This can be overcome in mechanical systems with fans and blowers.…”

Section: Introductionmentioning

confidence: 99%

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

2016

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Rotary desiccant wheels are used to regulate the relative humidity of airstreams. These are commonly integrated into Heating, Ventilation and Air-Conditioning units to reduce the relative humidity of incoming ventilation air. To maximise the surface area, desiccant materials are arranged in a honeycomb matrix structure which results in a high pressure drop across the device requiring fans and blowers to provide adequate ventilation. This restricts the use of rotary desiccant wheels to mechanical ventilation systems. Passive ventilation systems are able to deliver adequate ventilation air but cannot control the humidity of the incoming air. To overcome this, the traditional honeycomb matrix structure of rotary desiccant wheels was redesigned to maintain a pressure drop value below 2Pa, which is required for passive ventilation purposes. In addition to this, the temperature of the regeneration air for desorption was lowered. Radial blades extending out from the centre of a wheel to the circumference were coated in silica gel particles to form a rotary desiccant wheel. Computational Fluid Dynamics (CFD) modelling of the design was validated using experimental data. Reduction in relative humidity up to 55% was seen from the system whilst maintaining a low pressure drop across the new design. As an outcome of the work presented in this paper, a UK patent GB1506768.9 has been accepted.

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Experimental analysis on the dehumidification and thermal performance of a desiccant wheel

Cited by 141 publications

References 17 publications

Parabolic Trough Photovoltaic/Thermal Collectors: Design and Simulation Model

Parabolic Trough Photovoltaic/Thermal Collectors: Design and Simulation Model

Next-generation HVAC: Prospects for and limitations of desiccant and membrane-based dehumidification and cooling

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

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