Impact of Intake and Exhaust Ducts on the Recovery Efficiency of Heat Recovery Ventilation Systems

Marsik, Tom; Bickford, Riley; Dennehy, Conor; Garber-Slaght, Robbin; Kasper, Jeremy

doi:10.3390/en14020351

Cited by 4 publications

(1 citation statement)

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“…They pointed out that the lower heat recovery efficiency significantly impacted the ventilation energy in the cold climate. Marsik et al [26] investigated the impact of ducts on recovery efficiency and found that the very long and less insulated intake/exhaust ducts caused the overall heat recovery efficiency to be lower than 30%, despite the utilized heat recovery unit with the heat transfer efficiency of 70%. The heat recovery system has been studied deeply from the aspect of the component and system levels or the energy-saving potential for the whole building in previous studies.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Ventilation Heat Recovery Modelling for AccuRate Home—A Benchmark Tool for Whole House Energy Rating in Australia

Sun,

Ren,

Guo

2023

Energies

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To manage energy-efficient indoor air quality, mechanical ventilation with a heat recovery system provides an effective measure to remove extra moisture and air contaminants, especially in bathrooms. Previous studies reveal that heat recovery technology can reduce energy consumption, and its calculation needs detailed information on the thermal performance of exhaust air. However, there are few studies on the thermal performance of bathroom exhaust air during and after showers. This study proposed a detailed thermal performance prediction model for bathroom exhaust air based on the coupled heat and mass transfer theory. The proposed model was implemented into the AccuRate Home engine to estimate the thermal performance of residential buildings with heat recovery systems. The time variation of the water film temperature and thickness on the bathroom floor can be estimated by the proposed model, which is helpful in determining whether the water has completely evaporated. Simulation results show that changing the airflow rate in the bathroom has little effect on drying the wet floor without additional heating. The additional air heater installed in the bathroom can improve floor water evaporation efficiency by 24.7% under an airflow rate of 507.6 m3/h. It also demonstrates that heat recovery can significantly decrease the building energy demand with the fresh air load increasing and contribute about 0.6 stars improvement for the houses in Hobart (heating-dominated region). It may be reduced by around 3.3 MJ/(m2·year) for the houses in other regions. With this study, guidelines for optimizing the control strategy of the dehumidification process are put forward.

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Section: Introductionmentioning

confidence: 99%