Application of multi-objective optimization based on Sobol sensitivity analysis in solar single-double-effect LiBr−H2O absorption refrigeration

  • Shiqi Zhao 1 ,
  • Qingyang Li 1 ,
  • Yongchao Sun 1 ,
  • Dechang Wang , 1 ,
  • Qinglu Song , 1 ,
  • Sai Zhou 1 ,
  • Jinping Li 2 ,
  • Yanhui Li 1
Expand
  • 1. College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 266071, China
  • 2. College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Dechang Wang, wdechang@163.com
Qinglu Song, sql@qdu.edu.cn

Received date: 27 Oct 2023

Accepted date: 08 Jan 2024

Copyright

2024 Higher Education Press 2024

Abstract

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.

Cite this article

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

Acknowledgement

This work was funded by the National Natural Science Foundation of China under contract No. 51876094.

Competing Interests

The authors declare that they have no competing interests.

Notations

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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