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Frontiers in Energy

Front. Energy    2017, Vol. 11 Issue (4) : 516-526
Simulation and experiments on a solid sorption combined cooling and power system driven by the exhaust waste heat
Peng GAO, Liwei WANG(), Ruzhu WANG, Yang YU
Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China
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A solid sorption combined cooling and power system driven by exhaust waste heat is proposed, which consists of a MnCl2 sorption bed, a CaCl2 sorption bed, an evaporator, a condenser, an expansion valve, and a scroll expander, and ammonia is chosen as the working fluid. First, the theoretical model of the system is established, and the partitioning calculation method is proposed for sorption beds. Next, the experimental system is established, and experimental results show that the refrigerating capacity at the refrigerating temperature of –10°C and the resorption time of 30 min is 1.95 kW, and the shaft power is 109.2 W. The system can provide approximately 60% of the power for the evaporator fan and the condenser fan. Finally, the performance of the system is compared with that of the solid sorption refrigeration system. The refrigerating capacity of two systems is almost the same at the same operational condition. Therefore, the power generation process does not influence the refrigeration process. The exergy efficiency of the two systems is 0.076 and 0.047, respectively. The feasibility of the system is determined, which proves that this system is especially suitable for the exhaust waste heat recovery.

Keywords solid sorption      exhaust waste heat      combined cooling and power system      exergy efficiency     
Corresponding Authors: Liwei WANG   
Just Accepted Date: 30 October 2017   Online First Date: 22 November 2017    Issue Date: 14 December 2017
 Cite this article:   
Peng GAO,Liwei WANG,Ruzhu WANG, et al. Simulation and experiments on a solid sorption combined cooling and power system driven by the exhaust waste heat[J]. Front. Energy, 2017, 11(4): 516-526.
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Peng GAO
Liwei WANG
Ruzhu WANG
Yang YU
Fig.1  Principle of the solid sorptioncombined cooling and power cycle
Fig.2  Schematic diagram of thesolid sorption combined cooling and power system
Fig.3  Mathematical models
Fig.4  Simulation results
Fig.5  Experimental system of thesolid sorption combined cooling and power cycle
Fig.6  Experimental performanceof sorption beds
Fig.7  Experimental results at theresorption time of 30 min
Fig.8  Experimental results at differentresorption times
Fig.9  Performance comparison betweenthe combined cooling and power system and the sorption refrigerationsystem
A Area/m2
B Space/m
C Specific heat/(kJ·kg?1·K?1)
E Exergy/W
H Enthalpy/(kJ·kg1)
L Latent heat/(J·mol1)
M Total mass/kg
m Mass flow rate/(kJ·s1)
n Molar number/mol
Q Heat transfer rate/W
r Radius/m
Re Reynolds number
Pr Prandtl number
T Temperature/K
t Time/s
V Volume/m3
W Power/W
X Conversion degree
η Conversion efficiency
ρ Density/(kg·m?3)
λ Thermal conductivity/(W·m1·K1)
ΔH Reaction heat/(J·mol1)
ΔS Entropy change/(J·mol1·K1)
a Convective heat transfer coefficient/(W·m2·K1)
S Internal heat source/W
ave Average
c Control
chilled air Chilled air that flows through theevaporator
cycle Cycle time
eq Equilibrium
exh Exhaust
exp Expander
f Fluid
fan Electric fans
heat Sorption/desorption heat
in Inlet
ins Instantaneous
NH3 Ammonia
out Outlet
ref Refrigerant
s Isentropic
sor Sorbent
tot Total
tube Unit tube
w Wall
AV Ammonia valve
COP Coefficient of performance
CV Air valve
EAV Expansion ammonia valve
EV Exhaust valve
ENG-TSA Expanded natural graphite treatedwith sulphuric acid
HTS High-temperature salt
min Minute
MTS Middle-temperature salt
SCP Specific cooling power per kilogramsorbent
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