Effect of rotational speed on the performances of a desiccant wheel

Angrisani, Giovanni; Roselli, Carlo; Sasso, Maurizio

doi:10.1016/j.apenergy.2012.10.051

Cited by 80 publications

(26 citation statements)

References 20 publications

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“…The rotational speed may be adjusted to guarantee that the humidity ratio of the dehumidified air matches indoor design conditions for different outdoor air conditions. Angrisani et al 55 analyzed the effect of rotational speed on desiccant wheel performance, while Wang et al 56 presented an optimal humidity control model (OHCM) to optimize desiccant wheel operation while satisfying design constraints.…”

Section: Modeling Resultsmentioning

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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Section: Modeling Resultsmentioning

confidence: 99%

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

et al. 2017

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“…It is clear that the regenerative temperature has a good influence on the performance and moisture removal efficiency. In order to with increases regeneration temperature, the moisture removal efficiency increase dramatically that has been confirmed by [15,20]. For example, at a constant speed 7rph and regeneration temperature T=80 o c amount of moisture removal efficiency is η=.22.…”

Section: Figure 5 Moisture Removal Efficiency As a Function Of The Rmentioning

confidence: 69%

“…This study has been discussed in inlet humidity 55%; inlet temperature 24.6 o c outdoor temperature and humidity 38 o c and 70%. In rotating desiccant wheel, the removal of moisture is better at low speeds rather than high speeds [8,[15][16][17]. Increase in speed of wheel rotation due to lesser contact surface of the air entering with the desiccant wheel will lead to decrease removing moisture.…”

Section: Hybrid Systemsmentioning

confidence: 99%

Performance Assessment of a Solid Desiccant Based on Dehumidifier System Coupled with Air Conditioning System in a Tropical Climate

Zendehboudi¹,

Hashemi²,

Zendehboudi³

2014

IJUNESST

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“…They allow several benefits in terms of humidity control, indoor air quality, equivalent CO 2 emissions reduction, primary energy and electricity savings. The last three advantages are further improved considering solar thermal energy as the main source of energy for the plant [1,2].…”

Section: Introductionmentioning

confidence: 99%

Performance Assessment of a Solar-Assisted Desiccant-Based Air Handling Unit Considering Different Scenarios

et al. 2016

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Abstract:In this paper, three alternative layouts (scenarios) of an innovative solar-assisted hybrid desiccant-based air handling unit (AHU) are investigated through dynamic simulations. Performance is evaluated with respect to a reference system and compared to those of the innovative plant without modifications. For each scenario, different collector types, surfaces and tilt angles are considered. The effect of the solar thermal energy surplus exploitation for other low-temperature uses is also investigated. The first alternative scenario consists of the recovery of the heat rejected by the condenser of the chiller to pre-heat the regeneration air. The second scenario considers the pre-heating of regeneration air with the warmer regeneration air exiting the desiccant wheel (DW). The last scenario provides pre-cooling of the process air before entering the DW. Results reveal that the plants with evacuated solar collectors (SC) can ensure primary energy savings (15%-24%) and avoid equivalent CO 2 emissions (14%-22%), about 10 percentage points more than those with flat-plate collectors, when the solar thermal energy is used only for air conditioning and the collectors have the best tilt angle. If all of the solar thermal energy is considered, the best results with evacuated tube collectors are approximately 73% in terms of primary energy saving, 71% in terms of avoided equivalent CO 2 emissions and a payback period of six years.

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Effect of rotational speed on the performances of a desiccant wheel

Cited by 80 publications

References 20 publications

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

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

Performance Assessment of a Solid Desiccant Based on Dehumidifier System Coupled with Air Conditioning System in a Tropical Climate

Performance Assessment of a Solar-Assisted Desiccant-Based Air Handling Unit Considering Different Scenarios

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