Experimental investigation of counter flow heat exchangers for energy recovery ventilation in cooling mode

Al-Zubaydi, Ahmed Y. Taha; Hong, Guang

doi:10.1016/j.ijrefrig.2018.07.008

Cited by 25 publications

(7 citation statements)

References 16 publications

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“…Without mixing with each other, two airstreams flow along the space between adjacent plates. However, the heat or/and humidity is harvested and transferred between airflows [4 , 10] . As referred by [1 , 4 , 7 , 10 – [11] , [12] , the recovery potential of these air-to-air exchangers can reach up to 94% and 83% of sensible heat and latent heat, respectively.…”

Section: Methods Detailsmentioning

confidence: 99%

“…However, the heat or/and humidity is harvested and transferred between airflows [4 , 10] . As referred by [1 , 4 , 7 , 10 – [11] , [12] , the recovery potential of these air-to-air exchangers can reach up to 94% and 83% of sensible heat and latent heat, respectively. In order to recover more energy, new heat/energy exchangers designs (including core geometries, flow arrangements, materials, etc.)…”

Section: Methods Detailsmentioning

confidence: 99%

“…In this context, important efforts have been, over the recent years, dedicated to evaluating and enhancing HRVs and ERVs performances [8 – 12] . Experimental investigations have been conducted [1 , 4 , 8 , 12] and many researchers have been interested in mathematical modeling using numerical calculation approaches (the effectiveness-NTU (known as

) methods, computational fluid dynamics (CFD), and finite element methods (FEM)), and mainstream simulation platforms as well. In this respect, air-to-air heat/energy exchangers models are extensively developed in the literature to deeply evaluate the systems performances.…”

Section: Methods Detailsmentioning

confidence: 99%

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Modeling of an air-to-air exchanger with dual-core in cascade connection

et al. 2021

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With the current leaning towards finding effective solutions to maintain a good indoor air quality (IAQ) inside houses and buildings and to simultaneously reduce the energy consumption, air-to-air exchangers with heat/energy recovery have emerged as one of the promising technologies to provide a healthy and comfortable indoor environment. To deeply evaluate these systems performances, the present investigation focuses on modeling a combined ERV-HRV exchanger using the effectiveness-NTU ( ) method. To this end, a detailed mathematical model introducing heat and mass exchange mechanisms was developed and applied to predict the system energy recovery efficiency. To assess its suitability, the developed model was validated and compared to real measurements which carried out under the Atlantic Canada weather. The comparison findings disclosed that the developed model can predict the system performance with a maximum relative discrepancy less than 10%. • The detailed mathematical model including heat and mass exchange mechanisms was clearly developed using the approach in order to carefully predict the dual-core system performance in terms of sensible and latent recovery potential. • The developed model was validated against real data to evaluate its suitability and accuracy. Obtained results show that it could be satisfactory for predicting the dual-core system performances. • The approach adopted in this study could be a convenient method for modeling single or/and dual-core air-to-air heat/energy recovery systems.

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Section: Methods Detailsmentioning

confidence: 99%

Section: Methods Detailsmentioning

confidence: 99%

Section: Methods Detailsmentioning

confidence: 99%

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Modeling of an air-to-air exchanger with dual-core in cascade connection

et al. 2021

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“…They reported that the system financially pays itself in 2.5 years and also improves the PUE, ERF, and ERE of the data center [5]. Taha al-Zubaydi and Hong [6] experimentally investigated counter-flow HE for energy recovery ventilation in cooling mode in buildings [6]. They determined that dimpled surfaces perform about 50% better than flat surfaces.…”

Section: Introductionmentioning

confidence: 99%

Exergy-Optimum Coupling of Heat Recovery Ventilation Units with Heat Pumps in Sustainable Buildings

Kılkış¹

2020

J. sustain. dev. energy water environ. syst.

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This study shows that as a result of exergy destructions in heat recovery ventilation units, additional but avoidable carbon dioxide emissions take place due to the imbalance between the unit exergy of thermal power recovered and the unit exergy of fan power required to overcome the additional pressure drop. Therefore, special attention needs to be paid in the design and control of heat recovery ventilation units to minimize such carbon dioxide emissions responsibility by a proper exergy-rational balance between the heat recovered and power required. The potential improvements about the exergy rationality of the heat recovery ventilation units were investigated for several alternatives. These alternatives were: heat recovery ventilation-only (base case), coupling with an airto-air heat pump in tandem or parallel to the heat recovery ventilation unit, and a heat pump-only case. To carry out such an investigation, a new exergy-optimum design and dynamic control model was developed. Under typical design conditions, this model showed that a heat pump in parallel configuration does not improve the exergy rationality unless its coefficient of performance is over 11, which is not practical with today's technology. Instead, passive solar and wind energy systems have been discussed and recommended. Results were also compared with condensing boiler, micro-cogeneration unit, fuel cell, and electric resistance heating cases. It has been shown that heat recovery ventilation with an air-to-air heat pump in tandem is the best in terms of the exergy-based coefficient of performance. Additional comparisons were made concerning avoidable and direct carbon dioxide emission responsibilities, climate warming-potential and ozone-depleting potential, embodied energy, embodied exergy, and carbon dioxide recovery periods. A new composite index, which recognizes the direct relationship between the ozone layer depletion and the greenhouse gas emissions has also been introduced for comparing system alternatives in terms of their atmospheric footprint.

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“…Thermal energy losses due to mechanical ventilation can be typically 35 to 40 kWh/m 2 year in residential buildings [10] or approximately half of the energy consumption in wellinsulated buildings [11]. Heat or energy recovery ventilation systems can significantly reduce the energy consumption of heating systems associated with space heating [12]- [14]. Guillén-Lambea et al demonstrated that space heating and cooling requirements of nZEB energy loads cannot be achieved with current ventilation strategies in cold and mild climates, without recovering thermal energy embodied in extracted stale air [15], [16].…”

Section: Introductionmentioning

confidence: 99%

Thermal performance characterisation of a reverse-flow energy recovery ventilator for a residential building application

et al. 2019

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The European Union’s 2020 and 2030 sustainable energy policies seek significant reductions in both energy consumption and carbon emissions. These policies demand a greater use of energy efficient technologies and a transition away from fossil fuels. This paper studies one such technology, an indoor climate control system with a reverse-flow enthalpy recovery ventilator, capable of recovering both sensible and latent heat. The thermal performance characteristics are established using an experimental facility and calculation methods defined by European Standard EN 13141-7:2010. This involves measurement of temperature, humidity, pressure and volumetric air flow rates over a range of operating conditions. Total thermal energy recovery rates ranged from 0.63 kW to 2.2 kW, with energy recovery efficiency of 72.8 % to 88.6 %. The recovery efficiency ratio, which reflects the capacity of the indoor climate control system to recover thermal energy relative to its power consumption ranged between 6.87 to 19.97. Due to the unique reverse-flow defrost function, the system demonstrates operation down to -7 °C without frost formation. These results highlight the potential that this system can make towards the EU goals of reducing energy consumption, operating costs and carbon emissions associated with indoor climate control.

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Experimental investigation of counter flow heat exchangers for energy recovery ventilation in cooling mode

Cited by 25 publications

References 16 publications

Modeling of an air-to-air exchanger with dual-core in cascade connection

Modeling of an air-to-air exchanger with dual-core in cascade connection

Exergy-Optimum Coupling of Heat Recovery Ventilation Units with Heat Pumps in Sustainable Buildings

Thermal performance characterisation of a reverse-flow energy recovery ventilator for a residential building application

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