Performance of an advanced heat recovery ventilation system in the Canadian Arctic

Berquist, Justin; Banister, Carsen; Krys, Dennis

doi:10.1080/14733315.2020.1777009

Cited by 4 publications

(6 citation statements)

References 10 publications

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“…The performance of the ventilation system was assessed by evaluating its SRE, more information on the calculation of the SRE was outlined in [12]. The SRE of the ventilation system was calculated every minute and averaged to approximate the expected performance at each time interval.…”

Section: Ventilation System Performancementioning

confidence: 99%

“…Experimental results regarding the performance of a demand-controlled heat recovery ventilation system in Iqaluit, Nunavut, while using electrical preheat for frost control was presented in [12]. This paper expands on this initial study by comparing the performance of the ventilation system when using electrical preheat for frost control to when using recirculation for frost control, a comparison that has only been conducted numerically in previous research.…”

Section: Introductionmentioning

confidence: 98%

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Comparison of Heat Recovery Ventilator Frost Control Techniques in the Canadian Arctic: Preheat and Recirculation

2021

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Air-to-air heat/energy recovery ventilators can effectively reduce the cost associated with ventilating a home. However, high indoor moisture levels, in conjunction with extreme temperature differences between the outdoor and indoor air can cause frost accumulation in the mechanical equipment, leading to performance degradation or failure. In this research, a demonstration house using a heat recovery ventilation system in Iqaluit, Nunavut, Canada was used to compare the performance of two frost control techniques: recirculation and electrical preheat. The advantages and disadvantages of each method are outlined to highlight the need to adapt southern strategies to ensure system functionality in the Arctic. The system was equipped with a heat recovery ventilator (HRV) with built-in recirculation technology to defrost the HRV, as well as two electric preheaters that can be used instead of recirculation and prevent frost formation. Between December 2018 and April 2019 the ventilation system’s performance was monitored for seven weeks while using either recirculation or electrical preheat. The experiments showed the ventilation system equipment consumed more absolute energy with electrical preheat than with recirculation as the frost control technique. However, when using recirculation, the ventilation system experienced more losses throughout the ventilation system, causing the whole building to consume more energy due to an increase in energy consumption by the home’s heating system. Moreover, the quantity of outdoor air that was restricted while using recirculation made electrical preheat the superior option for this ventilation system design. The energy use of the ventilation system with electric preheat enabled was 35% lower on a per volume of outdoor air basis. Contrary to some belief that preheating is a poor approach for frost control in heat/energy recovery ventilators, this research finds that preheating can be a more energy efficient method to provide ventilation if controlled well.

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Section: Ventilation System Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Comparison of Heat Recovery Ventilator Frost Control Techniques in the Canadian Arctic: Preheat and Recirculation

2021

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“…The resulting expression is for the heat recovery efficiency of the HRV system as a function of the heat recovery efficiency of the HRV unit, airflow rate, and parameters of the intake and exhaust ducts; the indoor and outdoor temperatures are not needed because they cancel out (see Results section). Equations ( 5)- (8), where the indoor and outdoor temperatures are needed, are still useful on their own for validating the model with real in situ temperature data.…”

Section: Deriving the Mathematical Model For Calculating The Hrv Syst...mentioning

confidence: 99%

“…For example, some authors assume the reference scenario to be natural ventilation, which means the heat loss is directly proportional to the temperature difference between the inside and outside of the building [5,6]. Others assume the reference scenario to be mechanical ventilation with no heat recovery, which means the heat loss can be higher than in the natural ventilation case due to the exhaust air stream being warmed up above the interior building temperature by the heat rejected from the exhaust fans [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…It found that adding air filters increases the heat recovery efficiency while reducing the airflow. A study of an HRV in the Canadian Arctic showed a significant decrease in heat recovery efficiency with the use of preheaters to prevent frost build-up [8]. The issue of preheaters to prevent frost build-up was also evaluated in Fairbanks, Alaska [11].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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The heat recovery efficiency of ventilation systems utilizing heat recovery ventilators (HRVs) depends not only on the heat recovery efficiency of the HRV units themselves but also on the intake and exhaust ducts that connect the HRV units to the outside environment. However, these ducts are often neglected in heat loss calculations, as their impact on the overall heat recovery efficiency of HRV systems is often not understood and, to the knowledge of the authors, a mathematical model for the overall heat recovery efficiency of HRV systems that accounts for these ducts has not been published. In this research, a mathematical model for the overall heat recovery efficiency of HRV systems that accounts for the intake and exhaust ducts was derived and validated using real-life data. The model-predicted decrease in heat recovery efficiency due to the ducts was in reasonable agreement (relative error within 20%) with the real-life measurements. The results suggest that utilizing this model allows for more correct ventilation heat loss calculations compared to using the heat recovery efficiency of the HRV unit alone, but more field studies are needed to verify the accuracy of this model in a wide range of applications.

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Performance of energy recovery ventilators under different climatic regions

2020

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Performance of an advanced heat recovery ventilation system in the Canadian Arctic

Cited by 4 publications

References 10 publications

Comparison of Heat Recovery Ventilator Frost Control Techniques in the Canadian Arctic: Preheat and Recirculation

Comparison of Heat Recovery Ventilator Frost Control Techniques in the Canadian Arctic: Preheat and Recirculation

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

Performance of energy recovery ventilators under different climatic regions

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