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Performance of Solar Adsorption Refrigeration System: A case Study of a Two-Stage Freezing System with Varying Thermal Conductivity, Permeability of Adsorbents

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Advancements in Nanotechnology for Energy and Environment

Part of the book series: Advances in Sustainability Science and Technology ((ASST))

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Abstract

This research presents an improved design of a solar adsorption refrigeration system with certain specifications and requirements. In the traditional simulation of the performance of the solar adsorption refrigeration, the constant permeability and thermal conductivity were always selected for the establishment for the mathematic model. Latest research revealed that the permeability and thermal conductivity vary appreciably in the processes of adsorption and desorption, which indicates the consequential adsorption refrigeration performance will likewise be affected. The varying permeability and thermal conductivity in the CaCl2 and BaCl2 adsorption processes were tested, and the two-stage adsorption refrigeration system using CaCl2–BaCl2–NH3 as working pair was simulated to evaluate the effect of varying adsorbents’ permeability and thermal conductivity on the refrigeration system adsorption performance. The variable thermal conductivity and permeability simulation findings are compared to the constant thermal conductivity and permeability simulation results, as well as the experimental data. According to the results obtained, the greatest relative error between the simulation result with variable characteristics and the actual result is 8.3% for cooling capacity, 9.1% for SCP and 12% for COP, while the maximum relative error between the simulation result with constant properties and the experimental result is as high as 41.4% for cooling capacity, 42.8% for SCP and 36% for COP. This finding shows that variable characteristics have a major impact on simulation results and should be explored first before developing mathematical models for chemical and solar adsorption refrigeration systems.

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Abbreviations

c :

specific heat (kJ/(kg K))

COP :

coefficient of performance

D :

finned tube diameter (mm)

d :

finned tube base tube diameter (mm)

F :

heat transfer area (mm2)

h :

heat transfer coefficient (W/(m2 K))

K :

heat transfer coefficient (W/(m2 K))

L :

adsorbent bed axial Length (m)

M MTS :

mass of middle temperature salt

m :

mass (kg)

n :

numbers of tube

P :

pressure (Pa)

Q :

power (W)

q :

water mass flow (kg/s)

R :

gas constant (J/kg K)

r :

radius (m)

SCP :

specific cooling power

s :

fin thickness (mm)

t :

time (s)

T :

temperature (K)

x :

adsorption rate (kg/kg)

δ :

variable parameter

Δx :

cycle adsorption quantity (kg/kg)

ε :

the mass ratio of salts

ε t :

porosity

λ :

thermal conductivity (W/mK)

ν :

fin spacing (mm)

ρ :

density (kg/m3)

ad:

adsorbent

al:

aluminum

am:

ammonia

c:

cycle

co:

cooling

cond:

condenser

de:

desorption

e:

evaporation

eq:

equilibrium state

eff:

effective

f:

working fluid

g:

expand natural graphite

LTS:

middle temperature salt

lq:

liquid ammonia

h:

heating

in:

inlet

MTS:

middle temperature salt

l:

low temperature reactor

m:

middle temperature reactor

out:

outlet

P:

permeability

ref:

refrigeration

s:

steel

ref :

refrigeration

w:

water

y:

reaction process

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Author information

Authors and Affiliations

  1. Department of Mechanical Engineering, Faculty of Engineering, King Abdulaziz University, Jeddah, Saudi Arabia

    Nidal H. Abu-Hamdeh

  2. K. A. CARE Energy Research and Innovation Center, King Abdulaziz University, Jeddah, 21589, Saudi Arabia

    Nidal H. Abu-Hamdeh

  3. Energy Efficiency Group/Center of Research Excellence in Renewable Energy and Power Systems, King Abdulaziz University, Jeddah, Saudi Arabia

    Nidal H. Abu-Hamdeh

  4. Department of Mechanical Engineering, Technology Faculty, Fırat University, Elazığ, Turkey

    Hakan F. Öztop

Authors
  1. Nidal H. Abu-Hamdeh
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  2. Hakan F. Öztop
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Corresponding author

Correspondence to Nidal H. Abu-Hamdeh .

Editor information

Editors and Affiliations

  1. Department of Mathematics, National Institute of Technology, Uttarakhand, India

    Dharmendra Tripathi

  2. Department of Mechanical Engineering, Manipal University Jaipur, Jaipur, India

    Ravi Kumar Sharma

  3. Department of Mechanical Engineering, Fırat University, Elazig, Turkey

    Hakan F. Öztop

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Abu-Hamdeh, N.H., Öztop, H.F. (2022). Performance of Solar Adsorption Refrigeration System: A case Study of a Two-Stage Freezing System with Varying Thermal Conductivity, Permeability of Adsorbents. In: Tripathi, D., Sharma, R.K., Öztop, H.F. (eds) Advancements in Nanotechnology for Energy and Environment. Advances in Sustainability Science and Technology. Springer, Singapore. https://doi.org/10.1007/978-981-19-5201-2_8

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