Applicability of rotary thermal wheels to hot and humid climates

Herath, H.M.D.P.; Wickramasinghe, M.D.A.; Polgolla, A. M. C. K.; Jayasena, A.S.; Ranasinghe, Chathura; Wijewardane, M.A.

doi:10.1016/j.egyr.2019.11.116

Cited by 19 publications

(8 citation statements)

References 6 publications

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“…In order to handle both sensible and latent cooling loads, the air is cooled below the dew point temperature, which implies a high energy consumption of the chiller. Some strategies have been examined to reduce the cooling load in traditional AHUs by improving the thermodynamic processes using energy recovery units [37,38] and evaporative coolers [39]. For instance, Yari et al [40] used air-to-air heat exchangers in an AHU with 100% fresh air and an AHU with return air and observed that the use of such devices was more effective in the case of 100% fresh air, where the cooling load was reduced by 32%.…”

Section: Air-handling Subsystems: Traditional Air-handling Units (Ahu...mentioning

confidence: 99%

Sustainable active cooling strategies in hot and humid climates – A review and a practical application in Somalia

Litardo

Pero

Molinaroli

et al. 2022

Building and Environment

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Section: Air-handling Subsystems: Traditional Air-handling Units (Ahu...mentioning

confidence: 99%

Sustainable active cooling strategies in hot and humid climates – A review and a practical application in Somalia

Litardo

Pero

Molinaroli

et al. 2022

Building and Environment

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“…Herath et al, 2020 [166] Installing enthalpy wheels (EW) to central air conditioning systems. Energy saving is calculated for various operating conditions.…”

Section: Bellia Et Al 2000 [165]mentioning

confidence: 99%

Energy Recovery in Air Conditioning Systems: Comprehensive Review, Classifications, Critical Analysis, and Potential Recommendations

et al. 2021

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Energy has become the backbone of humanities daily activities. Heating, ventilating, and air conditioning systems (HVAC), which consume around 39% of energy in the residential sector, have turned into an essential constituent for providing fresh air, especially after COVD-19, not only in hospitals but also in any simple construction. Thus, decreasing this percentage or recovering part of the energy lost is an essential issue in today’s energy management scenarios. In this context, the present manuscript suggests a comprehensive review, classifications, critical analysis, and potential recommendations for energy recovery in air conditioning systems. It classifies energy recovery into two main categories: using lost energy for external uses, such as heating domestic water, or with other devices; and using lost energy for internal uses, such as the hot airflow which can be reused again for increasing efficiency of HVAC. In addition, this paper presents a summary of previous research and undertakes a review of the devices used for recovering energy. Furthermore, this review identifies superior devices in terms of climate and weather conditions. These objectives are accomplished by investigating around 190 published papers to conclude that energy recovery devices show a considerable effect on energy consumption in HVAC, mainly the heat pipe, fixed plate, and rotary wheel devices.

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“…Thermal wheels were therefore introduced in the 90's to minimize recirculation and increase the supply of fresh air from outside, which is now heated by the warm exhaust air from the inside without physical contact between the two air streams. However, in addition to their high construction costs and maintenance levels, these energy recovery heat exchangers are known to leak and send some indoor air back into the building ('carryover' effect) [30][31][32]. Hence, assuming that even a small fraction of virus recirculation is problematic, thermal wheels may not be the solution to optimize protection against viruses.…”

Section: Introductionmentioning

confidence: 99%

Reconciling airborne disease transmission concerns with energy saving requirements: the potential of UV-C pathogen deactivation and air distribution optimization

Gaillard¹,

Lohse²,

Bonn³

et al. 2023

Preprint

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The COVID-19 pandemic caused a paradigm shift in our way of using heating, ventilation, and air-conditioning (HVAC) systems in buildings. In the early stages of the pandemic, it was indeed advised to reduce the reuse and thus the recirculation of indoor air to minimize the risk of contamination through inhalation of virus-laden aerosol particles emitted by humans when coughing, sneezing, speaking or breathing. However, such recommendations are not compatible with energy saving requirements stemming from climate change and energy price increase concerns, especially in winter and summer when the fraction of outdoor air supplied to the building needs to be significantly heated or cooled down. In this experimental study, we aim at providing low-cost and low-energy solutions to modify the ventilation strategies currently used in many buildings to reduce the risk of respiratory disease transmission. We find that ultraviolet germicidal irradiation (UVGI) modules added to the HVAC system are very efficient at inactivating pathogens present in aerosols, leading to good indoor air quality even with significant indoor air recirculation. Moreover, we show that an optimal placement of the air exhaust vents relative to air supply vents can improve the ventilation efficiency, with significant consequences in terms of energy savings.

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Applicability of rotary thermal wheels to hot and humid climates

Cited by 19 publications

References 6 publications

Sustainable active cooling strategies in hot and humid climates – A review and a practical application in Somalia

Sustainable active cooling strategies in hot and humid climates – A review and a practical application in Somalia

Energy Recovery in Air Conditioning Systems: Comprehensive Review, Classifications, Critical Analysis, and Potential Recommendations

Reconciling airborne disease transmission concerns with energy saving requirements: the potential of UV-C pathogen deactivation and air distribution optimization

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