Efficient Heating Strategies Based On Variable Set-Point Temperature
of a Bus Cabin with No Air Recirculation

Afrasiabian, Ehsan; Douglas, Roy; Cunningham, Gareth; Geron, Marco

doi:10.11159/ffhmt21.136

Proceedings of the 8th International Conference on Fluid Flow, Heat and Mass Transfer (FFHMT'21) 2021

DOI: 10.11159/ffhmt21.136

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Efficient Heating Strategies Based On Variable Set-Point Temperature of a Bus Cabin with No Air Recirculation

Ehsan Afrasiabian¹,

Roy Douglas²,

Gareth Cunningham³

et al.

Abstract: A coupled model of a generic bus and an all-fresh air Heat Pump (HP) system was developed to investigate the impact of the cabin set-point temperature on the thermal comfort level and the energy consumption of heating. Predicted Mean Vote (PMV) and Predicted Percentage of Dissatisfied (PPD) from Fanger's model were used to quantify the comfort level inside the cabin. Different heating strategies based on fixed and variable set-point temperature were examined for an all-fresh air HP under different outdoor temp… Show more

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A numerical evaluation of a novel recovery fresh air heat pump concept for a generic electric bus

Afrasiabian

Douglas

Geron

et al. 2022

Applied Thermal Engineering

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Since the outbreak of the worldwide COVID-19 pandemic, public transportation networks have faced unprecedented challenges and have looked for practical solutions to address the safety concerns. In the wintertime, when natural ventilation is not an option, implementing an all-fresh air heating policy could be a viable solution to lower the transmission of such infectious disease, by reducing the density of pathogens and exposure time. Even though this will expectedly increase the energy demand, it is particularly crucial when the people safety is the first priority to operate any public transportation systems. To tackle the transmission issue, in this paper two concepts of an all-fresh-air Heat Pump (HP), namely a Baseline (BHP) and a novel Recovery (RHP) concepts were investigated. These two HP’s concepts could provide better ventilation inside the bus, compared to a Conventional (CHP) concept where the cabin air is re-circulated. To address the energy consumption concerns, the RHP concept is proposed to improve the performance of the system by recovering part of the cabin waste heat, without using any additional heat exchangers. Three different coupled models of a generic single-deck cabin and a heat pump system for each concept were developed in the Simscape environment of MATLAB (R2020b). The performance of these HPs was investigated to evaluate how an all-fresh air policy could affect the performance of the system in the BHP, and the energy-saving potential of the RHP concepts. The performance of the system was studied under different ambient temperatures ranging from -5 to 5 °C, and for low and moderate occupancy levels. Results show that employing the RHP and BHP significantly improved the ventilation rate per person by at least 102% and at most 125%, compared to a CHP concept with 50% of re-circulated air. Moreover, adopting the RHP concept also reduced the power demand by at least 8% and at most 11%, compared to the BHP for the selected fan and blower flow rates.

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A numerical evaluation of a novel recovery fresh air heat pump concept for a generic electric bus

Afrasiabian

Douglas

Geron

et al. 2022

Applied Thermal Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

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Efficient Heating Strategies Based On Variable Set-Point Temperature of a Bus Cabin with No Air Recirculation

Cited by 1 publication

References 9 publications

A numerical evaluation of a novel recovery fresh air heat pump concept for a generic electric bus

A numerical evaluation of a novel recovery fresh air heat pump concept for a generic electric bus

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