Low cost humidity controlled air-conditioning system for building energy savings in tropical climate

Aziz, Azizuddin Abd; Sumiyoshi, Daisuke; Akashi, Yasunori

doi:10.1016/j.jobe.2017.03.005

Cited by 20 publications

(7 citation statements)

References 12 publications

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“…The main reason for the high RH level in building B in comparison to building A was due to the quality of the HVAC system to maintain the indoor RH level, as natural ventilation or operable windows are not included in both buildings. This in compliance with Aziz, Sumiyoshi [61], who implied that the implementation of normal air handling units is unable to adequately dehumidify the indoor environment in the tropical climate of Malaysia.…”

Section: Full-scale Measurement Of the Indoor Environmentsupporting

confidence: 64%

“…The circumstance of building B (72.4% RH) led temperature and humidity to be the main concerns and sources of dissatisfaction. Aziz, Sumiyoshi [61] suggest the usage of a Dual Air Handling Unit system to control indoor humidity around 50% and achieve energy efficiency goals. In alignment with this study, Ravindu et al [78] found that high humidity is the main IEQ dissatisfaction source for a LEED Platinum-certified factory in a tropical microclimate.…”

Section: Discussionmentioning

confidence: 99%

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Occupants’ Satisfaction toward Indoor Environment Quality of Platinum Green-Certified Office Buildings in Tropical Climate

et al. 2021

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The quality of the indoor environment has become a vital component for buildings due to the time spent indoors. To this extent, the performance of the indoor environment is considered as part of the greenery criteria by green rating schemes such as the Green Building Index in Malaysia. This study aims to investigate and assess the quality of the indoor environment of Platinum-certified office buildings in a tropical climate. This research applied a case study approach over two Platinum-certified office buildings. Post-occupancy evaluation is employed integrating full-scale measurement with an occupants’ survey. The measurement was carried out from May to August, and 112 questionnaires were retrieved to evaluate occupants’ satisfaction with aspects of the indoor environment. Thermal comfort, indoor air quality, acoustic, lighting, furniture, and cleanliness are considered as the main study variables. The findings of full-scale measurement indicated high relative humidity, and low air velocity and illuminance. While occupants reported overall indoor environment quality (IEQ) comfort, a significant correlation of variables was observed. The main sources of dissatisfaction were identified as overcooling around 24 °C, high relative humidity (RH), around 70% RH, glare, and background noise around 51.9 dB. Statistically, a significant difference between occupants’ responses to IEQ of two cases was identified, although both buildings are labelled with a Platinum certificate.

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Section: Full-scale Measurement Of the Indoor Environmentsupporting

confidence: 64%

Section: Discussionmentioning

confidence: 99%

Occupants’ Satisfaction toward Indoor Environment Quality of Platinum Green-Certified Office Buildings in Tropical Climate

et al. 2021

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“…In view of this point, humidity control is worthy of consideration. Technologies of independent temperature and humidity control are becoming good methods to solve this problem [73] and the low economic cost [74]may contribute to its application possibilities in office or residential buildings widely.…”

Section: The Application Of the Modification Methods And Its Limitationsmentioning

confidence: 99%

A modified method of evaluating the impact of air humidity on human acceptable air temperatures in hot-humid environments

Ming

et al. 2018

Energy and Buildings

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R. (2018) A modified method of evaluating the impact of air humidity on human acceptable air temperatures in hothumid environments. Energy and Buildings, 158. pp. 393405. ISSN 03787788 Abstract: This research aims to investigate human thermal responses to air humidity in warm and hot environments and to evaluate the effect of humidity on human thermal comfort. 20 subjects were involved in 12 exposure experiments in a well-controlled climate chamber at three relative humidity levels (40%RH, 60%RH, 80%RH) and four air temperature levels (26°C, 28°C, 30°C, 32°C) with no much indoor airflow. The physical environmental and physiological parameters as well as subjective questionnaires were collected simultaneously during the period of experiments. The results show that in hot environments, particularly when the air temperature exceeds 30°C, the relative humidity has a significant effect on human thermal responses both physiologically and subjectively. The Standard Effective Temperature (SET) is biased when evaluating human thermal comfort in the hot-humid environments without considering human thermal adaptation to humidity. Hence, a humidity correction coefficient eRH is proposed to modify the deviation of the SET under different relative humidity levels, and to quantify the effect of humidity on human acceptable air temperatures. The modified acceptable temperature-humidity zone has been obtained using the modified method.

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“…Heating, ventilating, and air‐conditioning (HVAC) systems are valuable engineering tools widely adopted in buildings of tropical and sub‐tropical climates (such as Hong Kong) where air‐conditioning is needed almost all year round to provide comfortable indoor environments 1 . Furthermore, HVAC systems are a means of controlling indoor air quality.…”

Section: Introductionmentioning

confidence: 99%

Study of synergistic disinfection by UVC and positive/negative air ions for aerosolized Escherichia coli , Salmonella typhimurium , and Staphylococcus epidermidis in ventilation duct flow

Nunayon

Zhang

Chan³

et al. 2021

Indoor Air

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Heating, ventilating, and air-conditioning (HVAC) systems are valuable engineering tools widely adopted in buildings of tropical and sub-tropical climates (such as Hong Kong) where air-conditioning is needed almost all year round to provide comfortable indoor environments. 1 Furthermore, HVAC systems are a means of controlling indoor air quality. However, empirical evidence indicates that HVAC systems may also become potential sources of bioaerosols through entrainments induced by airflow when the filter or the surface of the HVAC duct is contaminated, either due to long operation hours or poor/improper design, installation, and maintenance. 2 Also, a recent comprehensive review points out that under favorable conditions, viable bioaerosols already accumulated on surfaces of different HVAC components can continue to grow and reproduce, suggesting a possible increase in biological contamination of the indoor environment. 3 Recently, scientific evidence indicates that aerosol transmission of SARS-CoV-2, the virus causing COVID-19 is possible. 4,5 For example, Liu et al. 4 detected SARS-CoV-2 as an aerosol in two Wuhan

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Low cost humidity controlled air-conditioning system for building energy savings in tropical climate

Cited by 20 publications

References 12 publications

Occupants’ Satisfaction toward Indoor Environment Quality of Platinum Green-Certified Office Buildings in Tropical Climate

Occupants’ Satisfaction toward Indoor Environment Quality of Platinum Green-Certified Office Buildings in Tropical Climate

A modified method of evaluating the impact of air humidity on human acceptable air temperatures in hot-humid environments

Study of synergistic disinfection by UVC and positive/negative air ions for aerosolized Escherichia coli , Salmonella typhimurium , and Staphylococcus epidermidis in ventilation duct flow

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