Performance Investigation of a Two-Bed Type Adsorption Chiller with Various Adsorbents
Abstract
:1. Introduction
2. Materials and Methods
2.1. Experimental Set-Up
2.2. Adsorbent
2.3. Theoretical Approaches
2.4. Operating Conditions
3. Results
3.1. Model Validation
3.2. Influence of Inlet Hot-Water Temperature on the System Performance
3.3. Influence of Cooling Water Temperature on the System Performance
3.4. Influence of Chilled Water Temperature on the System Performance
4. Discussion
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Nomenclature
A0 | Isotherm coefficient (-) |
B | Isotherm coefficient (-) |
A | Area (m2) |
CP | Specific heat (J/kgK) |
DSO | Pre-exponential constant of surface diffusivity (m2/s) |
Ea | Activation energy of surface diffusion (J/mol) |
K | Isotherm coefficient (-) |
KHenry | Isotherm coefficient (-) |
KSips | Isotherm coefficient (-) |
ksap | Overall mass transfer coefficient (W/m2K) |
Lw | Latent heat of vaporization (J/kg) |
Mass flow rate (kg/s) | |
n | Isotherm coefficient (-) |
P | Pressure (Pa) |
q | Adsorption rate (g/g) |
Qst | Heat of adsorption (kJ/kg) |
Q | Heat (kW) |
R | Ideal gas constant (J/kgK) |
rp | Particle size (m) |
T | Temperature (K) |
t | Time (s) |
U | overall heat transfer coefficient (W/m2K) |
W | Weight (kg) |
WF,HX | Weight of fin (kg) |
WK,HX | Weight of heat transfer tube (kg) |
Symbol | |
β | Isotherm coefficient (-) |
Superscripts | |
* | Equilibrium |
max | Maximum |
Subscripts | |
Al | Aluminum |
Cu | Cupper |
Chilled | Chilled water |
Cond | Condenser |
CW | Cooling water |
EW | Refrigerant in evaporator |
Eva | Evaporator |
HX | Heat exchanger |
HW | Hot water |
S | Saturation |
W | Water |
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Weight of Adsorbent (kg) | Chilled Water Temp. (°C) | Cooling Water Temp. (°C) | Hot Water Temp. (°C) | Cooling Water Flow Rate (kg/s) | Hot Water Flow Rate (kg/s) | Chilled Water Flow Rate (kg/s) | Cycle Time (sec) | Fixed U·A Adsorber/Condenser/Evaporator (W/K) |
---|---|---|---|---|---|---|---|---|
8 (each bed) | 13 | 27–33 | 80 | 1.0 | 1.0 | 0.7 | 420 | 1430/4500/ 1170 |
Property | Silica-Gel [2] | Aluminum Fumarate [22,27,28] | FAM-Z01 [17] |
---|---|---|---|
Pre-exponential constant of surface diffusivity (Dso, m2/s) | 2.54 × 10−4 | 3.63 × 10−14 | 2.54 × 10−4 |
Activation energy of diffusion (Ea, J/mol) | 45,500 | 18,026 | 42,000 |
Particle size (r, m) | 0.2 × 10−3 | 0.65 × 10−6 | 0.2 × 10−3 |
Specific heat (cp, J/kg·K) | 921 | 900 | 805 |
Heat of adsorption (Qst, kJ/kg) | 2430 | 2780 | 3109 |
Weight of Adsorbent (kg) | Chilled Water Temp. (°C) | Cooling Water Temp. (°C) | Cooling Water Flow Rate (kg/s) | Hot Water Flow Rate (kg/s) | Chilled Water Flow Rate (kg/s) | Cycle Time (sec) | Fixed UA Adsorber/Condenser/Evaporator (W/K) |
---|---|---|---|---|---|---|---|
47 | 14 | 30 | 1.7 | 1.7 | 0.7 | 420 | 2460/11190/1910 |
Cycle | Desorption | Pre-Heating Pre-Cooling | Adsorption | Pre-Heating Pre-Cooling | |
---|---|---|---|---|---|
Time(s) | 420 | 30 | 420 | 30 | |
Valve | Adsorption | X | X | O | X |
Condenser | O | X | X | X | |
Desorption | O | X | X | X | |
Evaporator | X | X | O | X | |
Heat exchanger | Bed 1 | Cold water | Hot water | Hot water | Cold water |
Bed 2 | Hot water | Cold water | Cold water | Hot water |
Property | Value |
---|---|
ACond (m2) | 3.73 |
AEva (m2) | 1.91 |
AHX (m2) | 2.46 |
CP,Al (J/kg·K) | 905 |
CP,Cu (J/kg·K) | 386 |
Cp,W (J/kg·K) | 4180 |
Lw (J/kg) | 2.5 × 106 |
WCond (kg) | 24.28 |
WEva (kg) | 12.45 |
WEW (kg) | 50.00 |
WF,HX (kg) | 64.04 |
WK,HX (kg) | 51.20 |
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Lee, J.-G.; Bae, K.J.; Kwon, O.K. Performance Investigation of a Two-Bed Type Adsorption Chiller with Various Adsorbents. Energies 2020, 13, 2553. https://doi.org/10.3390/en13102553
Lee J-G, Bae KJ, Kwon OK. Performance Investigation of a Two-Bed Type Adsorption Chiller with Various Adsorbents. Energies. 2020; 13(10):2553. https://doi.org/10.3390/en13102553
Chicago/Turabian StyleLee, Jung-Gil, Kyung Jin Bae, and Oh Kyung Kwon. 2020. "Performance Investigation of a Two-Bed Type Adsorption Chiller with Various Adsorbents" Energies 13, no. 10: 2553. https://doi.org/10.3390/en13102553