Application of multi-objective optimization based on Sobol sensitivity analysis in solar single-double-effect LiBr−H2O absorption refrigeration
Received date: 27 Oct 2023
Accepted date: 08 Jan 2024
Copyright
To improve the adaptability of solar refrigeration systems to different heat sources, a single-double-effect LiBr−H2O absorption refrigeration system (ARS) driven by solar energy was designed and analyzed. The system was optimized using a multi-objective optimization method based on Sobol sensitivity analysis to enhance solar energy efficiency and reduce costs. The model of the solar single-double-effect LiBr−H2O ARS was developed, and the continuous operation characteristics of the system in different configurations were simulated and compared. The results show that the average cooling time of the system without auxiliary heat source is approximately 8.5 h per day, and the double-effect mode (DEM) generates about 11 kW of cooling capacity during continuous operation for one week under the designated conditions, and the system with adding auxiliary heat source meet the requirements of daily cooling time, the solar fraction (SF) of the system reaches 59.29%. The collector area has a greater effect on SF, while the flowrate of the hot water circulating pump and the volume of storage tank have little effect on SF. The optimized SF increases by 3.22% and the levelized cost decreases by 10.18%. Moreover, compared with the solar single-effect LiBr−H2O ARS, the SF of the system is increased by 15.51% and 17.42% respectively after optimization.
Shiqi Zhao , Qingyang Li , Yongchao Sun , Dechang Wang , Qinglu Song , Sai Zhou , Jinping Li , Yanhui Li . Application of multi-objective optimization based on Sobol sensitivity analysis in solar single-double-effect LiBr−H2O absorption refrigeration[J]. Frontiers in Energy, . DOI: 10.1007/s11708-024-0938-4
Abbreviations | |
ARS | Absorption refrigeration system |
AUX | Auxiliary heater |
CI | Capital investment |
CT | Controller |
CRF | Capital recovery factor |
CW | Cooling water |
DEM | Double-effect mode |
DACH | Double-effect absorption chiller |
EV | Electric valve |
FC | Fuel cost |
HG | High pressure generator |
INSTL | Installation |
KA | Overall heat transfer coefficient |
L | Levelized |
NG | Natural gas |
SF | Solar fraction |
SEM | Single-effect mode |
SACH | Single-effect absorption chiller |
variables | |
ατ | Absorption conversion factor |
Q | Heat transfer rate |
T | Temperature |
x | Solution mass fraction |
Subscripts and superscripts | |
a | Ambient |
abs | Absorber |
aux | Auxiliary |
c | Solar collector |
ci | Inlet of the solar collector |
chi | Inlet of the chilled water |
cho | Outlet of the chilled water |
con | Condenser |
cwi | Inlet of the chilled water |
cwo | Outlet of the cooling water |
dcho | Chilled water outlet in double-effect mode |
dcwi | Cooling water inlet in double-effect mode |
dhwi | Hot water inlet in double-effect mode |
eva | Evaporator |
effect | Effect |
hgen | High pressure generator |
hwi | Inlet of the hot water |
gen | Generator |
i | Set-point |
in | Enter the component |
load | Load |
loss | Loss |
n | System lifetime |
out | Leave the component |
p | Pump |
scho | Chilled water outlet in single-effect mode |
scwi | Cooling water inlet in single-effect mode |
shwi | Hot water inlet in single-effect mode |
st | Storage tank |
u | Useful |
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