Influence of condensation on the efficiency of regenerative heat exchanger for ventilation

Низовцев, М. И.; Borodulin, V. Yu; Letushko, V. N.

doi:10.1016/j.applthermaleng.2016.10.016

Cited by 32 publications

(17 citation statements)

References 36 publications

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“…On the basis of the presented charts (Figs. 5,6,7,8,9,10,11,12,13,14), one can notice that the function of the temperature effectiveness is shaped in a similar way for all presented variants of the rotor's depth, i.e., its value rises due to moisture accumulation (in the form of water film or frost layer). Another similarity is an increase in "dry" area with increasing outdoor air temperature.…”

Section: Results Of Simulationsmentioning

confidence: 68%

“…The results of numerical simulations for the rest variants of rotor's width were conducted in the same form (Figs. 7,8,9,10,11,12,13,14).…”

Section: Results Of Simulationsmentioning

confidence: 99%

“…In the next stages, the possibilities of reducing the effectiveness of the device will be analyzed, which, as could be seen in the graphs (Figs. 5,6,7,8,9,10,11,12,13,14), allow for the elimination of frost accumulation zones, causing its melting.…”

Section: Results Of Simulationsmentioning

confidence: 99%

“…For many years, researchers have considered the correct operation of heat exchanger. There are a lot of research papers including analysis of heat transfer processes (under dry and phase transition conditions) [8][9][10][11][12]. In addition, many authors analyzed also the influence of different thermodynamic and geometrical parameters on heat recovery efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…The authors also proved that the empirical equation of Kays and London [21] is not valid in the case of low-speed region. Nizovtsev et al [10] studied the processes of condensation and vaporization in the regenerative air-to-air heat exchanger with periodic change in the air flow direction. For this purpose, the physical and mathematical model was developed.…”

Section: Introductionmentioning

confidence: 99%

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The influence of geometrical parameters on heat and mass transfer processes in rotary heat exchangers

2019

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This paper focuses on the influence of geometrical parameters of the rotary heat exchanger on its operation under highspeed rotor conditions. Proposed mathematical model of heat recovery wheel is based on a structure of the counter-flow heat exchanger model. After implementation of a numerical method on the modified α-model, the computer simulations were conducted. They allowed considering the distribution of the active heat and mass transfer zones ("dry," "wet" and "frost") on the matrix channel surface depending on the outdoor air conditions for different variants of rotor size. The obtained results indicate that the increase in the wheel's depth leads to the increase in temperature effectiveness of heat recovery (from 0.667 to 0.814). Moreover, it was also established that the threshold temperature under which the frost is accumulated on the core surface also rises with the rotor depth (from − 10.7 to −9.6 °C). It was concluded that under certain outdoor air temperature conditions (t 1i > -10.7 °C, for rotor depth equal to 0.40 m), the mass transfer rate of the condensed water vapor in the channels of the return air side is equal to the evaporation mass transfer rate in the channels of the supply air side, and hence, the temperature efficiency reaches the same value level as under "dry" operating conditions. It was established that only under frost accumulation conditions, the increased temperature effectiveness is observed. Keywords Thermal wheel · Waste heat recovery · Mathematical model · Energy saving List of symbols cSpecific heat capacity (J/(kg K)) D Diameter of the plate channel (m) Δ̄e vap 1

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