Analysis of Air-to-Air Rotary Regenerator for HVAC Systems Using CFD

Mahesh, S.; Jayaraman, Buvana; Madhumitha, R.

doi:10.1007/978-981-10-1771-1_49

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…This will ensure that the developed simulation model is validated with data from different rotary heat exchangers. Previous simulations were only validated with one rotary heat exchanger [2,12,15,[17][18][19][20][21][22] or a single rotor from a literature source [13,[23][24][25]. (4) Previous authors have used constant thermophysical properties [12,13,15,19,20,23,26].…”

Section: Introductionmentioning

confidence: 99%

“…Here, for improving simulation accuracy, thermophysical properties are calculated locally and are temperature dependent. (5) The state-of-the-art simulations for a rotary heat exchanger use either the ε-NTU method [2,12,14,15,17,[20][21][22][23][24][27][28][29][30][31][32] or computer fluid dynamics [13,18,25,26]. Finite difference methods, with locally calculated Nusselt number models and entry-region considerations, as done in this work, have until now been non-existent in literature.…”

Section: Introductionmentioning

confidence: 99%

“…For numerical rotor simulation, some authors have used the approximated closed solutions method proposed by Kays and London [37] using the ε − NTU method, where the problem is simplified by assuming a constant heat transfer coefficient along the tube [13,14,17,20,21,23,[27][28][29]31,32,38]. Others have used finite difference methods for solving the same problem.…”

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confidence: 99%

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Improvement of a Nusselt-Based Simulation Model for Heat Transfer in Rotary Heat Exchangers

2020

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In the last 50 years, the technology of rotary heat exchangers has not changed considerably. A reliable simulation can help improve the design of this technology. In this work, a simulation for rotary heat exchangers was developed and validated with multiple experimental data. This simulation takes an innovative approach based on locally calculated heat transfer coefficients and considers the entry region effect. This approach proved to be accurate since the average difference between the experimental results and the proposed model with a constant heat boundary condition is 0.1% and the maximum absolute deviation 1%. Experimental, as well as simulation results, indicate that lower empty tube gas velocity (1 m/s) and higher rotational speed (12 rpm) improve thermal efficiency compared to commonly used operating conditions. Additionally, a new model for predicting the local internal Nusselt number for sine ducts in the rotor channels is proposed, which considers the entry region effect.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Improvement of a Nusselt-Based Simulation Model for Heat Transfer in Rotary Heat Exchangers

2020

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Determination of the geometric shape of the air collector for supplying thermal energy to the heating system of electric bus batteries

Prokhorov

Butarovich

2017

Izvestiya MGTU MAMI

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Operation of electric buses in the winter climatic conditions of Russia is associated with the need to maintain positive temperatures of battery cells of the traction battery, taking into account the maximum available energy at battery temperature plus 20 ... 25 ° C. When operating battery cells that have negative temperatures, the energy of the batteries decreases by 20 ... 25%. The average temperature in the central part of Russia ranges from minus 18 ° C to plus 25 ° C. To ensure the battery operation in the above-mentioned temperature ranges, a thermostating system is installed. Depending on the operating conditions, these systems are performed both liquid and air. For air heating and cooling of the battery, a self-contained air heater is used as a heat source: a generator of heated air gases, and for cooling - supply and exhaust fans. Heated air passes through the collector from the auxiliary heater to the inlet ventilation holes. The geometric shape of the collector affects the flow rates of the air streams blown from the four outlets. Uneven consumption causes improper heating of the battery, which in turn leads to a charge imbalance between the individual battery packs and a decrease in battery capacity. The objective of the study is to determine the geometric shape of the air manifold, which provides equal heat flow through the outlet openings. The solution of this problem was performed by iterative calculations of air flows in various geometric forms of the collector in ANSYS CFX software. The results of calculation of air collectors intended for heating and ventilation of electric bus power batteries are presented in the article. The optimal shape, which ensures an equal flow of heat energy through the outlet holes, is determined.

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Modelling of a Large Rotary Heat Exchanger

Tulwin

2017

acs

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The first simulation consists of a partial cut-out of gas flow canal between the heat exchanger fins. The simulation is steady state and mainly provides the information about the heat transfer coefficient and pressure drop across the canal. The second simulation takes into account the complete system of rotary heat exchanger. It is a transient simulation with moving mesh. Then the heat transfer and air flow parameters are presented as a porous volume with a heat transfer model and rotational multi zone interface conditions. This simplification is accurate providing much better performance as the number of mesh nodes is much smaller. The methodology of the model setup is presented.

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Analysis of Air-to-Air Rotary Regenerator for HVAC Systems Using CFD

Cited by 3 publications

References 4 publications

Improvement of a Nusselt-Based Simulation Model for Heat Transfer in Rotary Heat Exchangers

Improvement of a Nusselt-Based Simulation Model for Heat Transfer in Rotary Heat Exchangers

Determination of the geometric shape of the air collector for supplying thermal energy to the heating system of electric bus batteries

Modelling of a Large Rotary Heat Exchanger

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