Explicit analytic solution for heat and mass transfer in a desiccant wheel using a simplified model

Kang, Hyungmook; Lee, Gilbong; Lee, Dae-Young

doi:10.1016/j.energy.2015.10.091

Cited by 30 publications

(6 citation statements)

References 29 publications

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“…Lee [25] has proved that the analytic solution obtained through this mathematical model is in good agreement with the numerical solution. Therefore, the inlet air conditions used by Lee and the outlet air conditions calculated herein were employed to model the SDP desiccant wheel in EnergyPlus.…”

Section: Desiccant Wheel Modellingsupporting

confidence: 56%

“…The subscript is used to distinguish air and desiccant. To obtain an analytic solution for the state of air flowing through the SDP desiccant wheel, the following equations (Equations ( 5)-( 8)) for calculating the outlet air temperature and humidity on the dehumidification side and regeneration side of the SDP desiccant wheel were derived based on the above four governing equations, where A, B, C, and D are the four integral constants originating from the 2nd order differential equations [25,26]:…”

Section: Desiccant Wheel Modellingmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Evaporator Position on Heat Pump Assisted Solid Desiccant Cooling Systems

2020

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The packaged terminal air conditioning with reheat (PTACR) system, as a commonly used dehumidification system, faces the problem of extra energy consumption in the deep-cooling and reheating processes. Therefore, different heat pump assisted hybrid solid desiccant cooling (HPDC) systems were proposed and their characteristics were investigated via EnergyPlus simulations. The system energy efficiency presents an upward trend with the increase in outdoor temperature and humidity. A high-humidity climate leads to the improvement of system performance. The dehumidification performance of the desiccant wheel in the HPDC system declines when outdoor humidity increases. Compared with the PTACR system, the energy consumption of the HPDC system in which the evaporator was placed upstream of the desiccant wheel is reduced by 36%, 66%, and 64%, respectively, under different high-humidity climates. The system maintained the indoor environment within the comfort zone, and eliminated the need for a heat source for desiccant regeneration. In conclusion, the HPDC system is an available alternative that considers both energy consumption and system performance. Placing the evaporator upstream of the desiccant wheel is more advantageous in high-temperature and high-humidity climates.

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Section: Desiccant Wheel Modellingsupporting

confidence: 56%

Section: Desiccant Wheel Modellingmentioning

confidence: 99%

Effect of Evaporator Position on Heat Pump Assisted Solid Desiccant Cooling Systems

2020

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“…The pressure drop across the TES unit was calculated using the same method as that used for the PV/T-SAC. The DW was modeled based on the method developed by Kang et al (2015), in which the outlet temperature and humidity ratio of the process air were predicted using Eqs. (3) and (4), respectively.…”

Section: System Modelingmentioning

confidence: 99%

Energy and exergy analysis of a desiccant cooling system integrated with thermal energy storage and photovoltaic/thermal-solar air collectors

Ren

Sun

2019

Science and Technology for the Built Environment

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This paper presents an energy and exergy analysis of a desiccant cooling system integrated with an air-based thermal energy storage (TES) unit using phase change materials (PCMs) and a photovoltaic/thermal-solar air collector (PV/T-SAC). The PV/T-SAC was used to generate thermal energy for desiccant wheel regeneration and space heating, and the TES was used to solve the mismatch between thermal energy supply and demand. The performance of this system was evaluated using a simulation system developed using TRNSYS. The effects of several key parameters on solar thermal contribution, specific net electricity generation, and the exergy destructions of individual components and overall system were investigated. It was found that the system exergy destruction was mainly resulted by the PV/T-SAC. Both the exergy performance and energy performance of this system were significantly influenced by the length and PV factor of the PV/T-SAC used. The results obtained from this study could be potentially used to guide the optimal design of desiccant cooling systems integrated with thermal energy storage and solar energy systems.

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“…Paper [3] presents the modelling results of the recovery unit working in real conditions with regard to changes in temperature, air velocity, and rotor speed. In [4], the heat and mass transfer in a desiccant wheel was modelled into a set of linear differential equations under the linearization assumptions on the temperature and humidity profiles and the psychrometric relation. In [5], the optimum operational conditions of the rotary regenerator were obtained using genetic algorithm optimization technique subject to a list of constraints.…”

Section: Introductionmentioning

confidence: 99%

“…Simplified analytical models are used in most of the sources reviewed, though it is well known that solving non-linear partial differential equations is generally needed in the case of heat and mass transfer. In [4], the advantages of analytical versus computational methods are presented, and an analytical solution using the linearization of differential equations of heat and mass transfer in a desiccant wheel is proposed. In contrast, some authors state that it is impossible to accurately calculate the temperature efficiency of an RHE by applying the analytical method, because the process of heat exchange is not stationary [15] and [16].…”

Section: Introductionmentioning

confidence: 99%

Minimization of the Lifecycle Cost of a Rotary Heat Exchanger Used in Building Ventilation Systems in Cold Climates

Sokolnikas¹,

Čiuprinskas

Čiuprinskienė

2021

SV-JME

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This article presents an analysis of rotary heat exchangers (RHE) used as heat recovery units in building ventilation systems in cold climates. Usually, heat exchangers with the highest heat transfer efficiency are the preferable option for this purpose. However, such exchangers usually have the highest media pressure drop, thus requiring the highest amount of energy for media transportation. In this study, the problem is solved by analysing the lifecycle cost (LCC) of the RHE including both the recovered heat and the electricity consumed in the fans of the air handling unit (AHU). The purpose of the investigation was to determine the optimal set of geometrical characteristics such as the exchanger’s length, foil thickness, the height and width of the air channel. Two hundred and seventy different combinations were examined using analytical dependencies and ANSYS simulations. The results are compared with experimental data obtained earlier at the KOMFOVENT laboratory. The results show that the best overall energy efficiency is obtained in heat exchangers that do not offer the best heat recovery efficiency, and LCC differences in the same climatic and economic conditions can go as high as 31 %, mainly due to the geometrical parameters of the heat exchanger.

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Explicit analytic solution for heat and mass transfer in a desiccant wheel using a simplified model

Cited by 30 publications

References 29 publications

Effect of Evaporator Position on Heat Pump Assisted Solid Desiccant Cooling Systems

Effect of Evaporator Position on Heat Pump Assisted Solid Desiccant Cooling Systems

Energy and exergy analysis of a desiccant cooling system integrated with thermal energy storage and photovoltaic/thermal-solar air collectors

Minimization of the Lifecycle Cost of a Rotary Heat Exchanger Used in Building Ventilation Systems in Cold Climates

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