Optimal operation condition division with profit and losses analysis of energy recovery ventilator

Wu, Weiwei; Fang, Zhaosong; Ji, Wenhui; Wang, Houhua

doi:10.1016/j.enbuild.2015.11.048

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…As shown in Figures 11 to 14, 16 and 20, improving the heat exchange efficiency, accompanied by a rise in the pressure loss, has little benefit to the user, whereas enhancing the performance of the total heat exchange element by improving the physical property of the constituent materials has a profound effect. As shown in Figure 10, increasing the heat recovery by narrowing the air passage gap provides a markedly positive effect, whereas as shown in Figure 13, the effect of changing the gap on improving the element performance was not confirmed.…”

Section: Discussionmentioning

confidence: 99%

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Numerical sensitivity analyses for identifying rate-limiting factors influencing total energy exchange efficiency in energy recovery ventilator

Sotokawa

Chung

Yoo

et al. 2019

Indoor and Built Environment

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Energy recovery ventilators (ERVs) are used to recover sensible and latent heat to reduce the heating and cooling load caused by outdoor air intake into indoor environments. The efficiency of the heat exchanger, comprising flow channels and constituent materials, determines the heat exchange performance of the ERV. Understanding the heat and mass transfer mechanisms in the ERV and optimizing the geometry and materials of the flow channel are essential for improving the ERV performance. Herein, numerical methods for predicting and clarifying the hygrothermal transfer mechanism in the heat exchange element of an ERV were developed, and their prediction accuracy was confirmed by analysing the exchange efficiencies in the scaled-down ERV unit model. The verified numerical model was applied to sensitivity analyses to clarify the rate-limiting factors influencing the total heat exchange efficiency of the ERV. Our findings have clarified that under Japan Industrial Standard cooling conditions, a 50-fold increase in the thermal conductivity of the spacer plate, the total heat recovery performance was enhanced by 13%, as for a 2-fold increase in the moisture conductivity, the performance was enhanced by 20%. The findings of this research can be expected to contribute to the energy saving effect in buildings.

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Section: Discussionmentioning

confidence: 99%

“…Wu et al. 16 quantitatively evaluated the energy recovery performance during the cooling and heating seasons for an office building by employing the building energy simulation (BES) software TRNSYS.…”

Section: Introductionmentioning

confidence: 99%

Numerical sensitivity analyses for identifying rate-limiting factors influencing total energy exchange efficiency in energy recovery ventilator

Sotokawa

Chung

Yoo

et al. 2019

Indoor and Built Environment

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“…Furthermore Wu et al [3] investigated the trade-off between heating energy reduction and air conveying fan power by HRV in an annual simulation in an office building. The calculations were performed using TRNSYS.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Primary Energy and Carbon Dioxide Emissions of a Passive Ventilation System with a Solar Air Heater

Matsunaga¹,

Kikuta

Hirakawa

et al. 2023

Energies

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Improvements in envelope performance have reduced heat loss from insulation, and the ratio of heat loss through ventilation load has become relatively large. In recent years, the use of heat recovery ventilation systems (HRV) has particularly increased. However, ventilation generates not only ventilation load but also air conveying fan power, such that conserving energy for both is important. Therefore, this paper focuses on a passive ventilation system with a solar air heater (PVSAH), which is a passive ventilation system that does not use air conveying fan power and uses a solar air heater that uses solar energy. The total energy consumption of the PVSAH, the widely used mechanical exhaust ventilation system (EV), and the HRV, which has high energy efficiency, was compared with the ventilation load plus air conveying fan power. The primary energy evaluation and carbon dioxide (CO2) emissions were compared by region, and the optimal system was proposed according to regional characteristics. In warmer zones, the PVSAH saved the most energy, while the HRV increased energy consumption. The comparison of CO2 emissions by ventilation systems when using heat pumps for cooling and heating showed that PVSAH > MEV > HRV for Heating Degree-Day (HDD) 1500 and below, PVSAH > HRV > MEV for HDD 1500 to 2750, and HRV > PVSAH > MEV for HDD 2750 and above. MEV were favored in that order. As the CO2 emission factor decreases, the difference in CO2 emissions between systems decreases. If the difference in emissions becomes smaller, then considering the initial and running costs and the risk of failure of the system is crucial. A simple system configuration with low risks of failure and maintenance, such as PVSAH, may prove advantageous in the future.

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“…Wu et al used transient systems simulation tool (TRNSYS) to evaluate energy recovery in an office building in Chingqing, China during the cool and hot seasons. 9 Fouih et al modelled a heat recovery ventilator using the software TRNSYS and characterised its annual performance when integrated into residential and commercial low-energy buildings in France. 10 They found that the adequacy of using a heat recovery ventilation (HRV) system depends on the building type, the heating load and ventilation device.…”

Section: Introductionmentioning

confidence: 99%

Development and Performance Investigation of Energy Recovery System in Tropical Climate

Tang¹,

Ahmad²,

Yusup³

2018

JPS

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Optimal operation condition division with profit and losses analysis of energy recovery ventilator

Cited by 6 publications

References 15 publications

Numerical sensitivity analyses for identifying rate-limiting factors influencing total energy exchange efficiency in energy recovery ventilator

Numerical sensitivity analyses for identifying rate-limiting factors influencing total energy exchange efficiency in energy recovery ventilator

Evaluation of the Primary Energy and Carbon Dioxide Emissions of a Passive Ventilation System with a Solar Air Heater

Development and Performance Investigation of Energy Recovery System in Tropical Climate

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