Investigation of a single room ventilation heat recovery exchanger under frosting conditions: Modeling, experimental validation and operating strategies evaluation

Gendebien, Samuel; Parthoens, Antoine; Lemort, Vincent

doi:10.1016/j.enbuild.2018.12.039

Cited by 14 publications

(4 citation statements)

References 20 publications

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“…It consumes 24 W, 48 W, and 72 W, respectively from low to high positions. These constant electric fan powers were selected according to the literature (Gendebien 2019), which are suitable for the proposed system.…”

Section: 𝑚̇𝑑 = 𝑣̇𝑑 × 𝜌 𝑑mentioning

confidence: 99%

Can Emissions Be Reduced Using Latent Heat of Methane in LNG Powered Heavy Vehicles?

Uğurlu¹

2022

European Journal of Science and Technology

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Liquid natural gas-powered vehicles store liquid natural gas fuel on board. When the gasification of this fuel is maintained, cooling down of the the vehicle cabin can be provided. In this study, the theoretical calculation of the savings that can be achieved if this process is done with an appropriate tool is emphasized. Since diesel fuel is used in heavy vehicles, diesel is taken as reference fuel in the calculations. How much methane is needed by the heavy vehicles that operate at various consumption values is calculated fist, then how much LNG should be evaporated for this need is found, and then, what amount of cooling this evaporating LNG could provide is computed. The results are presented in tabular form. It is seen that the proposed system can provide fuel savings with sufficient cooling, and therefore reduce emissions, especially in the vehicles mentioned.

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Section: 𝑚̇𝑑 = 𝑣̇𝑑 × 𝜌 𝑑mentioning

confidence: 99%

Can Emissions Be Reduced Using Latent Heat of Methane in LNG Powered Heavy Vehicles?

Uğurlu¹

2022

European Journal of Science and Technology

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“…The energy amounts of the fan which draws from the battery are 24 W, 48 W, and 72 W, respectively for the three positions. These constant electric fan powers were chosen accordingly that they are widely used in literature and suitable for the proposed VAAC system [101] (6)…”

Section: (5)mentioning

confidence: 99%

Sıvı hidrojenli taşıtlar için yardımcı bir klima sistemi

Uğurlu

2019

International Journal of Advances in Engineering and Pure Sciences

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Current Vehicle Air Conditioning (VAC) systems, which are operated by compressors driven by Internal Combustion Engines (ICEs) or batteries, increase the fuel consumption and emissions depending on the thermal load of the vehicle passenger cabin. Since decreasing the thermal load of the vehicle will decrease the fuel consumption and emissions, studies in this area is very important from the economic and environmental aspects. In this study, an Auxiliary Air Conditioning (AAC) system for Internal Combustion Engine Vehicles (ICEVs) or Fuel Cell Vehicles (FCVs) that store Liquid Hydrogen (LH 2) as a powering source has been proposed to make contribution to the works in this significant area. ICEVs were evaluated as Gasoline Equivalent Hydrogen Internal Combustion Engine Vehicles (GEHICEVs) and Diesel Equivalent Hydrogen Internal Combustion Engine Vehicles (DEHICEVs) considering their average fuel consumption rates according to the New European Driving Cycle (NEDC). According to the analyses, approximate hydrogen consumption values have been found that reach 0.7 g/s for GEHICEVs, 1.6 g/s for DEHICEVs, and 0.6 g/s for FCVs with maximum cooling rates of 326 W, 704 W, and 250 W, respectively.

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“…A review on frost in air to air heat and enthalpy exchangers and the various frost control methods was presented in [6]. There are tradeoffs between the frost control methods though -a sacrifice must be made on the energy performance or ventilation requirements of the ventilation system to control frost [7]. Some research has been conducted to evaluate the performance of individual frost control methods; however, a limited amount of research has been conducted to compare the performance of frost control methods within ventilation systems in extremely cold climates.…”

Section: Introductionmentioning

confidence: 99%

“…In [7] the performance of seven frost control techniques was numerically evaluated: exhaust only with constant volumetric flow rate, exhaust only with constant fan power, recirculation with constant volumetric flow rate, recirculation with constant fan power, electrical preheat, unbalanced flow method, and preheating by mixture of exhaust inlet and supply inlet air. The simulations showed the best frost control technique would be the exhaust only solution with constant power.…”

Section: Introductionmentioning

confidence: 99%

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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Investigation of a single room ventilation heat recovery exchanger under frosting conditions: Modeling, experimental validation and operating strategies evaluation

Cited by 14 publications

References 20 publications

Can Emissions Be Reduced Using Latent Heat of Methane in LNG Powered Heavy Vehicles?

Can Emissions Be Reduced Using Latent Heat of Methane in LNG Powered Heavy Vehicles?

Sıvı hidrojenli taşıtlar için yardımcı bir klima sistemi

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

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