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Effect of adsorption and desorption cycle time allocation on the performance of an adsorption chiller

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Abstract

Most previous studies on adsorption chillers were conducted using the same adsorption and desorption times. Instead, this study analyzed various adsorption/desorption time allocations, and systematically examined the effect of cycle time allocation on system performance. The results provide physical insights for 3-bed adsorption chillers. The effect of hot water temperature and cycle time on the optimum adsorption/desorption time ratio was also examined. Setting the proper adsorption and desorption times was much more important for smaller cycle times. The highest degradation in COP (coefficient of performance) found was 36% at 300 s of cycle time, compared with the conventional 1:1 ratio. When the temperature of the heat source is low, the ratio of adsorption/desorption time was not significantly affected, however, for higher performance at high temperature, a longer adsorption time than desorption time was required.

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Abbreviations

A :

Heat transfer area

COP :

Coefficient of performance

D ep :

Equivalent diffusivity

D so :

Pre-exponent constant of surface diffusivity

Cp :

Specific heat

E a :

Activation energy of diffusion

ΔH :

Heat of adsorption

h :

Convection coefficient

K app :

Apparent permeability of adsorbent bed

K d :

Bed permeability

k :

Thermal conductivity

L :

Latent heat of evaporation

L v :

Latent heat of vaporization

M :

Mass

M v :

Molar mass of vapor

ṁ :

Mass flow rate

Nu :

Nusselt number

P :

Pressure

Po :

Saturation pressure

Pr :

Prandtl number

Qeva :

Heat of evaporation

Qin :

Input heat

q :

Adsorption amount

q* :

Equilibrium adsorption

q max :

Maximum adsorption amount in isotherm

q min :

Minimum adsorption amount in isotherm

r :

Radial distance from center of particle

R :

Radial direction

R u :

Universal gas constant

R v :

Gas constant of vapor

Re :

Reynolds number

SCP :

Specific cooling power

T :

Temperature

t :

Time

u :

Velocity

Z :

Axial direction

ρ :

Density

a :

Adsorption

b :

Solid adsorbent

c :

Copper

bed :

Adsorption bed

con :

Condenser

cycle :

Cycle

des :

Desorption

eva :

Evaporator

f :

Fluid

in :

Inlet

m :

Middle

max :

Maximum

min :

Minimum

o :

Out

out :

Outlet

v :

Vapor

ε :

Porosity

μ :

Dynamic viscosity

ρ :

Density

σ :

Collision diameter for Lennard-Jones potential

τ :

Tortuosity factor

Ω :

Collision integral

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Acknowledgments

This work was supported by Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (No. 20192010107020, Development of hybrid adsorption chiller using unutilized heat source of low temperature).

Author information

Authors and Affiliations

  1. Department of Mechanical Engineering, Sejong University, Seoul, 05006, Korea

    Woo Su Lee, Moon Yong Park, Seung Soo Lee, Xuan Quang Duong, Ngoc Vi Cao & Jae Dong Chung

  2. Department of Mechanical Engineering, Vietnam Maritime University, Hai Phong, 18000, Vietnam

    Xuan Quang Duong & Ngoc Vi Cao

  3. Energy System R&D Group, Korea Institute of Industrial Technology, Chonam, 31056, Korea

    Oh Kyung Kwon

Authors
  1. Woo Su Lee
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  2. Moon Yong Park
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Corresponding author

Correspondence to Jae Dong Chung.

Additional information

Woo Su Lee received his Master’s degree from Sejong University in 2020. His research interests include optimization and analysis of thermal driven system such as adsorption refrigerator using heat and mass transfer.

Moon Yong Park received his B.S. degree in Mechanical Engineering from Sejong University, Seoul, Korea in 2019. He is currently in M.S. course in Sejong University. His research interests include thermal driven system such as adsorption chiller or thermal storage system using heat and mass transfer phenomena.

Seung Soo Lee received his B.S. degree in Mechanical Engineering from Sejong University, Seoul, Korea in 2019. He is currently in M.S. course in Sejong University. His research interests include energy storage system such as latent heat energy storage and battery thermal management system.

Xuan Quang Duong is a Post-doc in Mechanical Engineering, Sejong University. He received his Ph.D. from Sejong University in 2019. His research interests include thermal driven system such as adsorption chiller or thermal storage system using heat and mass transfer.

Ngoc Vi Cao is a lecturer in Mechanical Engineering, Vietnam Maritime University. He received his Ph.D. from Sejong University in 2020. His research interests include energy analysis, thermal driven system such as adsorption chiller or thermal storage system using heat and mass transfer.

Oh Kyung Kwon is a Principal Researcher of Korea Institute of Industrial Technology. He received Ph.D. from Pukyong National University in 2000. His research interests include absorption and adsorption systems, vapor compression heat pump systems, and heat and mass transfer enhancement of heat exchangers.

Jae Dong Chung is a Professor in Mechanical Engineering, Sejong University. He received Ph.D. from Seoul National University in 1996. His research interests include sensible, latent and thermos-chemical energy storage system and heat-driven refrigeration system such as desiccant and adsorption cooling. On those topics, he published about 145 refereed papers.

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Lee, W.S., Park, M.Y., Lee, S.S. et al. Effect of adsorption and desorption cycle time allocation on the performance of an adsorption chiller. J Mech Sci Technol 35, 323–331 (2021). https://doi.org/10.1007/s12206-020-1232-y

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  • DOI: https://doi.org/10.1007/s12206-020-1232-y

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