Abstract
This paper adopts an investigation of a novel cascading adsorption cooling system. The system has two high-temperature zeolite-water beds topping a silica-gel/water bed using the heat recovery technique. A parametric study is carried out on the proposed method using a robust numerical model that shows excellent validation compared to the data reported in the literature. The system is assessed using two performance indices: the specific cooling power (SCP) and the coefficient of performance (COP). The results indicate that the proposed system has a COP value approaching 1.6, and its SCP can reach 170 W/kg. It is observed that increasing the half-cycle time of zeolite beds from 10 to 120 min reduces the SCP by 80% while it increases the COP by about 53%. In this regard, it is noticed that a half-cycle time of 60 min is recommended for optimal system performance. When the heating source temperature increases (110–190 °C), a rise of 120% is obtained in the SPC and COP enhances by about 35%. Above this temperature level, the increase in the SPC becomes unnoticeable, and conversely, the COP slightly drops. Moreover, when the bed's cooling-fluid inlet temperature to the system rises from 10 to 40 °C, there is a forty percent decline in SCP with a thirty percent drop in the COP. In this regard, it is preferable to keep the bed's cooling-fluid inlet temperature below 30 °C for better performance. Also, the mass flow rate of the cooling fluid shouldn't be less than 0.1 kg/s. An increase in the inlet temperature of chilled water (5–25 °C) leads to increases in the SCP and COP by 200 and 65%, respectively. Moreover, the SCP and COP decline by 70 and 30% when the total zeolite mass rises from 2 to 30 kg. For better system performance, the ratio of the silica-gel mass to the total zeolite mass in the system should range from 0.45 to 0.55.
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Abbreviations
- \(A\) :
-
Heat transfer area, m2
- \(\mathrm{AR}\) :
-
Adsorbent mass ratio, kg/kg
- \({c}_{p}\) :
-
Specific heat, kJ/kg-K
- \({D}_{so}\) :
-
Kinetic constant, m2/s
- \({E}_{a}\) :
-
Activation energy, J/kg
- \({h}_{fg}\) :
-
Latent heat of vaporization, kJ/kg
- \(m\) :
-
Mass, kg, or heterogeneity factor, –
- \(\dot{m}\) :
-
Mass flow rate, kg/s
- \(n\) :
-
Interaction factor, –
- \(P\) :
-
Pressure, kPa
- \({P}_{s}\) :
-
Saturation pressure, kPa
- \(q\) :
-
Instantaneous water vapor uptake, kg/kg
- \({q}_{o}\) :
-
Equilibrium water vapor uptake, kg/kg
- \({Q}_{st}\) :
-
Isosteric heat of adsorption, kJ/kg
- \(\dot{Q}\) :
-
Heat transfer rate, kW
- \(R\) :
-
Gas constant, kJ/kg-K
- \(\overline{R }\) :
-
Universal gas constant, kJ/kmol-K
- \({\overline{R} }_{p}\) :
-
Particle average radius, mm
- \(t\) :
-
Time, s or min
- \(T\) :
-
Temperature, °C or K
- \(TC\) :
-
Thermal capacity, kJ/K
- \(U\) :
-
Overall heat transfer coefficient, kW/m2-K
- \(UA\) :
-
Overall heat transfer coefficient-area product, kW/K
- \(z\) :
-
Compressibility factor,
- α :
-
Dimensionless parameter defined by Eq. (3)
- \(\beta\) :
-
Loading factor, –
- \(\varphi\) :
-
Parameter defined by Eq. (5), kJ/kg
- \({\varphi }_{m}\) :
-
Minimum potential energy, kJ/kg
- \({\varphi }^{*}\) :
-
Parameter appears in Eq. (2), kPa
- \({\eta }_{\mathrm{comb}}\) :
-
Combustion efficiency, –
- \(\rho\) :
-
Density, kg/m3
- \(\theta\) :
-
Floating variable,
- \(1, 2,\dots\) :
-
State points
- \(\mathrm{I},\mathrm{ II},\mathrm{III}\) :
-
Related to bed number
- \(\mathrm{ads}\) :
-
Related adsorption process
- \(\mathrm{b}\) :
-
Bed
- \(\mathrm{cf}\) :
-
Cooling fluid
- \(\mathrm{chw}\) :
-
Chilled water
- \(\mathrm{cond}\) :
-
Condenser
- \(\mathrm{cw}\) :
-
Cooling water
- \(\mathrm{des}\) :
-
Related to desorption process
- \(\mathrm{evap}\) :
-
Evaporator
- \(\mathrm{ew}\) :
-
Evaporator water
- \(\mathrm{hcycle}\) :
-
Half cycle
- \(\mathrm{hf}\) :
-
Heating fluid
- \(\mathrm{htf}\) :
-
Heat transfer fluid
- \(\mathrm{in}\) :
-
Related to inlet flow stream
- \(\mathrm{max}\) :
-
Maximum
- \(\mathrm{out}\) :
-
Related to outlet flow stream
- \(\mathrm{sg}\) :
-
Silica-gel
- \(\mathrm{sgwb}\) :
-
Silica-gel/water bed
- \(\mathrm{wl}\) :
-
Water liquid
- \(\mathrm{wv}\) :
-
Water vapor
- \(\mathrm{z}\) :
-
Zeolite
- \(\mathrm{zwb}\) :
-
Zeolite/water bed
- \(\mathrm{COP}\) :
-
Coefficient of performance, –
- HR:
-
Heat recovery
- HTF:
-
Heat transfer fluid
- MR:
-
Mass recovery
- PC:
-
Pre-cooling
- PH:
-
Pre-heating
- \(SCP\) :
-
Specific cooling power, W/kg
- SGW:
-
Silica-gel/water
- ZW:
-
Zeolite/water
- \(\mathrm{COP}\) :
-
Coefficient of performance, –
- HR:
-
Heat recovery
- HTF:
-
Heat transfer fluid
- MR:
-
Mass recovery
- PC:
-
Pre-cooling
- PH:
-
Pre-heating
- \(SCP\) :
-
Specific cooling power, W/kg
- SGW:
-
Silica-gel/water
- ZW:
-
Zeolite/water
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The authors acknowledge the support provided by King Fahd University of Petroleum & Minerals (KFUPM) through the project DUP20101.
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Elbassoussi, M.H., Zubair, S.M. Performance Evaluation of a Cascading Adsorption Cooling System Using a Robust Numerical Model. Arab J Sci Eng 47, 16533–16550 (2022). https://doi.org/10.1007/s13369-022-07420-1
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DOI: https://doi.org/10.1007/s13369-022-07420-1