CFD optimization of return air ratio and use of upper room UVGI in combined HVAC and heat recovery system

Kanaan, Mohamad

doi:10.1016/j.csite.2019.100535

Cited by 27 publications

(21 citation statements)

References 32 publications

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“…Noakes and others [124] established a regional infection risk model and found that the sterilizing effect of introducing UV devices with an average plane irradiance of 0.2 W/m 2 is the same as increasing the hourly air exchange rate from three to six. A study by Kanaan [125] also showed that utilizing upper indoor UVGI systems was a more economical way to reduce indoor bacterial concentration than increasing outdoor air volume. The rated power of UVGI systems is negligible compared to the power consumption of HVAC systems.…”

Section: Impacts Of Hvac System Operation On Energy Consumptionmentioning

confidence: 99%

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COVID-19 Impact on Operation and Energy Consumption of Heating, Ventilation and Air-Conditioning (HVAC) Systems

Zheng

Wang

et al. 2021

Advances in Applied Energy

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Heating, ventilation and air-conditioning (HVAC) system is favourable for regulating indoor temperature, relative humidity, airflow pattern and air quality. However, HVAC systems may turn out to be the culprit of microbial contamination in enclosed spaces and deteriorate the environment due to inappropriate design and operation. In the context of COVID-19, significant transformations and new requirements are occurring in HVAC systems. Recently, several updated operational guidelines for HVAC systems have been issued by various institutions to control the airborne transmission and mitigate infection risks in enclosed environments. Challenges and innovations emerge in response to operational variations of HVAC systems. To efficiently prevent the spread of the pandemic and reduce infection risks, it is essential to have an overall understanding of impacts caused by COVID-19 on HVAC systems. Therefore, the objectives of this article are to: (a) provide a comprehensive review of the airborne transmission characteristics of SARS-CoV-2 in enclosed spaces and a theoretical basis for HVAC operation guideline revision; (b) investigate HVAC-related guidelines to clarify the operational variations of HVAC systems during the pandemic; (c) analyse how operational variations of HVAC systems affect energy consumption; and (d) identify the innovations and research trends concerning future HVAC systems. Furthermore, this paper compares the energy consumption of HVAC system operation during the normal times versus pandemic period, based on a case study in China, providing a reference for other countries around the world. Results of this paper offer comprehensive insights into how to keep indoor environments safe while maintaining energy-efficient operation of HVAC systems.

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Section: Impacts Of Hvac System Operation On Energy Consumptionmentioning

confidence: 99%

“…Furthermore, UVGI systems as presented in Ref. 35 and 125 can be installed in HVAC systems to sterilize indoor air according to Ref. 55 .…”

Section: Future Challenges and Innovations Of Hvac Systemsmentioning

confidence: 99%

COVID-19 Impact on Operation and Energy Consumption of Heating, Ventilation and Air-Conditioning (HVAC) Systems

Zheng

Wang

et al. 2021

Advances in Applied Energy

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“…Air conditioning systems must be designed with a standard installation design, equipped with sound absorbers, air intake and exit control systems, special filters, disinfectants resistance so that easy to clean and rust resistant (29). the unproperly maintained of HVAC (heating, ventilation, and air conditioning) system will make microbial contamination worse and cause disease transmission (30).…”

Section: Discussionmentioning

confidence: 99%

“…A dark room due to lack of sunlight has the potential for germs (16). UV light emitted at a wavelength of 254 nm is able to deactivate germs by damaging their DNA (30).…”

Section: Discussionmentioning

confidence: 99%

Environmental Management Strategy to Control Air Germs in Tjitrowardojo District Hospital

Praptiwi

Rahardjo

Sunarto

2021

JKL

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Introduction: The presence of air germs in the hospital patient rooms is potentially to cause health problems for patients. This study aimed to identify andanalyze environmental factors associated with air germs, and formulate environmental management strategi to control air germs in the patient rooms. Methods: This study was an observational analytic survey, used a mixed method and a cross sectional design. Data collection was conducted through laboratory tests and interviews. Data was analysed by pearson correllation test to analyze environmental factors associated with air germs. The appropriate environmental management strategies was determined through SWOT analysis (Strength, Weakness, Opportunities, Threats). Results and Discussion: Several factors related to air germs were temperature (p = 0.032), lighting (p = 0.01) and the staff knowledge (p = 0.001). Humidity was not significantly related to air germs (p = 0.178), The results of SWOT analysis indicated that aggressive strategies (Strengths and Opportunities) were arranging internal hospital policies regarding to air quality management based on the Ministry of Health, utilizing educational qualifications and knowledge of room staff to support policy implementation, improving the performance of outsourcing personnel in cleaning services and maintaining hospitals infrastructure, increasing Inhouse Training activities. Conclusion: Environmental factors play an important role in the presence of air germs in the patient rooms so appropriate environmental management strategies are needed to control the presence of air germs.

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“…It was found that 43% of savings in the annual energy consumption was achieved when using the energy recovery wheel comparing to a 100% fresh air case (no energy recovery wheel). While maintain an acceptable IAQ level without violating the ASHRAE standard for acceptable CO2 concentration in breathing spaces [13].…”

Section: Energy Recovery Systemsmentioning

confidence: 99%

Energy Recovery Equipment and Control Strategies in Various Climate Regions

Talib¹,

Rodrigues²,

Nassif³

2020

Adv. sci. technol. eng. syst. j.

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Different types of air-to-air energy recovery technologies such as coil loops, heat pipes, sensible wheels, and total energy wheels are frequently incorporated in HVAC systems in an attempt to reduce energy consumption. This study examines the impact of various types of energy recovery technologies and capacity control strategies on a building's cooling, heating, and fan energy consumption across different climate zones, including Fargo, ND;

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CFD optimization of return air ratio and use of upper room UVGI in combined HVAC and heat recovery system

Cited by 27 publications

References 32 publications

COVID-19 Impact on Operation and Energy Consumption of Heating, Ventilation and Air-Conditioning (HVAC) Systems

COVID-19 Impact on Operation and Energy Consumption of Heating, Ventilation and Air-Conditioning (HVAC) Systems

Environmental Management Strategy to Control Air Germs in Tjitrowardojo District Hospital

Energy Recovery Equipment and Control Strategies in Various Climate Regions

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