Analysis of heat and mass transfer characteristics of desiccant dehumidifier system with honeycomb configuration

Yaningsih, Indri; Wijayanta, Agung Tri; Miyazaki, Takahiko; Koyama, Shigeru

doi:10.1016/j.applthermaleng.2018.08.066

Cited by 18 publications

(7 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The turbulent intensity of the flow increases following the increase in Re, leading to the enhancement of the convective heat transfer. These results are consistent with the those of the previous studies [3][4][5][6][7]9,10]. Figure 4 further shows that, for the STT, the pitch ratio y/W of 2.7 yields the highest Nu followed by those of 4.5 and 6.5.…”

Section: Resultssupporting

confidence: 92%

“…Numerous research studies have been performed on heat exchangers, to enhance the heat transfer, in order to achieve a higher heat exchange performance [1,2]. For this purpose, the following efforts have been reported in our previous works: a direct contact system for adsorption cycle [3][4][5], using nanofluid as the working fluid [6,7]; improvement of maldistribution inside the distributor of heat exchangers [8][9][10]; using inserts inside the tubes [11][12][13][14][15]. Based on the published reports, it is known that the investigations on passive heat transfer enhancement methods using various inserts do not consider the existing problems.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Internal Flow in an Enhanced Tube Having Square-cut Twisted Tape Insert

et al. 2019

View full text Add to dashboard Cite

In this study, a numerical simulation has been conducted in order to evaluate the thermal hydraulic performance of a turbulent single-phase flow inside an enhanced tube equipped with a square-cut twisted tape (STT) insert. The classical twisted tape (CTT) insert was also investigated for comparison. The k-ε renormalized group turbulence model has been utilized as the turbulent model. Various twist ratios (y/W) of 2.7, 4.5, and 6.5 were investigated for the Reynolds number range of 8000–18,000, with water as the working fluid. The numerical results indicated that, in comparison with the plain tube (PT), the tube equipped with the STT with the twist ratios of 2.7, 4.5, and 6.5 led to an increase in the values of the Nusselt number and friction factor in the inner tube by 45.4–80.7% and 2.0–3.3 times, respectively; in addition, the highest thermal performance of 1.23 has been obtained. The results further indicated that the tube equipped with the CTT of the same twist ratios improved the Nusselt number and friction factor in the inner tube by 40.3–74.4% and 1.7–3.0 times, respectively, in comparison with the PT; further, the maximum thermal performance of 1.18 was achieved.

show abstract

Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Internal Flow in an Enhanced Tube Having Square-cut Twisted Tape Insert

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Outcomes presented that Nu and Sh are all the additional equally receptive to alteration of adsorption temperature than exchanging time. Less desorption temperature brings about large estimations of Sh and Nu [8]. Expanding coefficient of execution (COP) of fume pressure refrigeration frameworks by using regular air cooled condensers is necessary issue particularly in regions having antagonistic surrounding conditions.…”

Section: Introductionmentioning

confidence: 99%

“…On the basis of assessment of existing literature on mass transferal in packed particle beds, Pesaran utilizes following relations for gas side transfer coefficients. The heat transfer coefficient for Solid-side Resistance model is given by equation 2 [8].…”

mentioning

confidence: 99%

Dehumidification Analysis of Rotary Solid Desiccant Wheel & Packed Bed System

Hussain¹,

Alam²,

Ahamad³

et al. 2021

JUSST

View full text Add to dashboard Cite

Moisture transport is one of the major challenges in desiccant dehumidification. The transfer of moisture basically involves transfer of heat between moist air and desiccant particles as well as the mass transferal of moisture between moist air and desiccant particles. Type of desiccant dehumidification analysis is heating with dehumidification. Warmth move between sodden air and desiccants likewise gains consideration since temperature appropriation significantly influences the mass exchange execution through desiccant isotherms. The warmth and mass exchange between a clammy air stream and desiccant particles is dissected. Surface dissemination is noticed to overwhelm mass exchange within the silica gel particles. Here in this paper, we have compared the three diffusion coefficients Ordinary, Knudson and surface diffusion both for packed bed system and rotary desiccant system. Also, two models of move coefficients are introduced here and analyzed. Pseudo gas side controlled model usages an observational gas side mass exchange coefficient to represent dissemination opposition on strong side. Solid side resistance model settles the dissemination condition and is the finest exact as far as move coefficients. Notwithstanding, it makes examination considerably more clear.

show abstract

“…Consideration of reducing energy consumption to drive an air conditioning system for heating [1,2], cooling [3,4], humidification [5,6], and dehumidification [7][8][9] has gained the attraction of developing an effective system that consumes less energy. For most cases, in hot and humid areas, around 20%-40% of total energy is dominated by air conditioning systems [10].…”

Section: Introductionmentioning

confidence: 99%

Influence of Phase Change Phenomena on the Performance of a Desiccant Dehumidification System

et al. 2020

Self Cite

View full text Add to dashboard Cite

Demands of standalone dehumidification systems have been increasing in order to realize energy savings in air-conditioning processes. In a desiccant dehumidification system, the water vapor from the moist air undergoes a phase change phenomenon, this being from vapor to adsorbed phase, a process analogous to latent heat exchange. The energy exchange involved in such a process is often significant—up to 80% of the total energy exchange. In this study, the influence of the phase change phenomena involved in a desiccant dehumidification system was evaluated experimentally, along with the performance investigation under low desorption air temperatures of 308, 318, 328, 338, and 345 K. The system was driven by a constant adsorption temperature of 293 K. The dehumidification ability, latent heat ratio, and latent effectiveness were employed as key performance indexes. The results showed that with the increased desorption temperature, the latent heat ratio decreased, whereas the dehumidification ability and latent effectiveness increased. The highest latent heat ratio was found to be 0.61 at the desorption temperature of 308 K, whereas the highest latent effectiveness was obtained at the desorption temperature of 345 K. A suitable temperature for the effective and efficient dehumidification was observed to be 318 K for the current system.

show abstract

Analysis of heat and mass transfer characteristics of desiccant dehumidifier system with honeycomb configuration

Cited by 18 publications

References 27 publications

Internal Flow in an Enhanced Tube Having Square-cut Twisted Tape Insert

Internal Flow in an Enhanced Tube Having Square-cut Twisted Tape Insert

Dehumidification Analysis of Rotary Solid Desiccant Wheel & Packed Bed System

Influence of Phase Change Phenomena on the Performance of a Desiccant Dehumidification System

Contact Info

Product

Resources

About