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Heat Recovery Time of Adsorption Cooling System
Xuan Quang Duong,Ngoc Vi Cao,JAE DONG CHUNG 대한설비공학회 2018 International Journal Of Air-Conditioning and Refr Vol.26 No.2
In this study, a two-dimensional numerical model of finned-tube type adsorbers was developed and used to examine heat recovery time to improve the performance of an adsorption cooling system. The optimal heat recovery time, which resulted in the highest COP, was determined for a range of heat source temperatures (60–90 ∘ C) and cycle times (600–1200 s). The introduced heat recovery process enhanced COP, but also reduced SCP. This penalty became more serious when the hot water temperature was low and cycle time was short, which serves as a guideline for when heat recovery should be adopted in a given operating condition.
Numerical Analysis of a Compressor Type of Dehumidifier: (I) Fluid Flow
Duong, Xuan Quang,Chung, Jae Dong World Scientific Publishing Company 2017 International Journal of Air-Conditioning and Refr Vol.25 No.2
<P>A three-dimensional simulation of a compressor dehumidifier was conducted by applying a porous model for condenser and evaporator, and a moving reference frame for the fan. A physical model was simulated for the unit cell of the actual shape of a fin-tube, and the parameters of viscous resistance and initial resistance were obtained. With these values, the porous model showed close agreement with the physical model within a reasonable computation time. A uniform flow across the evaporator and the condenser is desirable for high performance of the dehumidifier. Surface averaged velocity, standard deviation of velocity, and uniformity were chosen as indicators of the design object. A case study showed that two factors, (i) reducing the space between the evaporator and the condenser and (ii) introducing a cover to reduce the by-passing air flow, have the strongest influence on the air distribution in this dehumidifier.</P>
Numerical Analysis of a Compressor Type of Dehumidifier: (I) Fluid Flow
Xuan Quang Duong,정재동 대한설비공학회 2017 International Journal Of Air-Conditioning and Refr Vol.25 No.2
A three-dimensional simulation of a compressor dehumidifier was conducted by applying a porous model for condenser and evaporator, and a moving reference frame for the fan. A physical model was simulated for the unit cell of the actual shape of a fin-tube, and the parameters of viscous resistance and initial resistance were obtained. With these values, the porous model showed close agreement with the physical model within a reasonable computation time. A uniform flow across the evaporator and the condenser is desirable for high performance of the dehumidifier. Surface averaged velocity, standard deviation of velocity, and uniformity were chosen as indicators of the design object. A case study showed that two factors, (i) reducing the space between the evaporator and the condenser and (ii) introducing a cover to reduce the by-passing air flow, have the strongest influence on the air distribution in this dehumidifier.
Xuan Quang Duong,Huy Hai Nguyen,김규목(Kyu-Mok Kim),정재동(Jae Dong Chung) 대한설비공학회 2018 설비공학 논문집 Vol.30 No.2
A numerical analysis of a compressor dehumidifier has been conducted focusing on the air side heat transfer, which is a part of a series research on the dehumidifier. The moving reference frame was applied to the fan modeling, and the porous model was used for the evaporator and condenser modeling. Curve fitting obtained the inertial and viscous resistances parameters to the results of the physical model of the unit cell with actual shape of a fin tube. The porous model was validated within a reasonable computation time for the range of practical inlet velocity of a dehumidifier. A parametric study has been conducted for fin number, fan speed (i.e., air flow rate), and evaporator/ condenser tube arrangement. ANOVA analysis showed the dependency of each parameter on the velocity and temperature uniformity, which are desirable for high performance of the dehumidifier.
Preliminary study on the hybrid adsorption cooling system
Mahdi Koushaeian,Xuan Quang Duong,Moon Yong Park,Jae Dong Chung 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
Hybrid systems are going popular for cooling, heating, refrigeration purposes in different applications, whereas they allow using the benefits of both technologies and better consumption of renewable sources. However, this paper presents a combination of mechanical vapor compression and adsorption techniques that have been studied as a hybrid cooling system. An adsorption cooling system employing silica gel with two adsorption beds has been proposed. This system has been studied theoretically to work under different operating conditions using a proposed simulation MATLAB code. At the first stage, validated the vapor compression cooling and adsorption system in the individual state working. In addition, the result has been compared with an adsorption system to tell the benefit of the combination.