Aqueous lithium bromide nanosolution for solar absorption refrigeration systems

2019 ◽  
Author(s):  
Aimen Zeiny ◽  
Maje Alhaji Haruna ◽  
Dongsheng Wen
Keyword(s):  
Lithium Bromide ◽  
Absorption Refrigeration ◽  
Solar Absorption ◽  
Aqueous Lithium Bromide

Analysis of Aqueous Lithium Bromide Absorption Refrigeration Systems

2021 ◽  
pp. 1-18
Author(s):  
Dongchuan You ◽  
Hameed Metghalchi
Keyword(s):  
Lithium Bromide ◽  
Double Effect ◽  
Environmental Safety ◽  
Coefficient Of Performance ◽  
Low Grade ◽  
Absorption Refrigeration ◽  
Solution Energy ◽  
Exit Temperature ◽  
Single Effect ◽  
Aqueous Lithium Bromide

Abstract Aqueous lithium bromide absorption refrigeration systems have been studied in recent years and their advantages like environmental safety and utilization of low-grade energy have been proved. Research on improving their performance has been increasing lately. In this paper, single effect and parallel flow double-effect aqueous lithium bromide absorption refrigeration systems have been studied. Mass, energy, entropy and exergy balances have been used to model the absorption refrigeration systems. Parametric studies have been done to investigate effects of cooling load, evaporator exit temperature, condenser exit temperature, generator vapor exit temperature, absorber exit temperature, solution energy exchanger effectiveness on the performance of the system. The analyses show coefficient of performance and exergetic efficiency of double-effect absorption refrigeration is higher than those of a single-effect refrigeration. The effect of other parameters on performance of both single and double-effect systems have been described in detail in the article.

Performance of Horizontal Smooth Tube Absorber With and Without 2-Ethyl-Hexanol

2001 ◽  
Vol 124 (1) ◽  
pp. 177-183 ◽  
Author(s):  
Ick-Soo Kyung ◽  
Keith E. Herold
Keyword(s):  
Mass Transfer ◽  
Tube Bundle ◽  
Lithium Bromide ◽  
Mass Transfer Process ◽  
The Novel ◽  
Absorption Refrigeration ◽  
Transfer Coefficients ◽  
Significant Augmentation ◽  
Aqueous Lithium Bromide ◽  
Flow Activity

Absorption of water vapor into aqueous lithium bromide is a fundamental step in absorption refrigeration. When the liquid film is laminar, the coupled heat and mass transfer process is controlled by mass transfer, resulting in low transfer coefficients. Significant augmentation of mass transfer, and hence of the coupled process, is achieved by introducing a trace amount (on the order of 100 ppm) of 2-ethyl-hexanol. The alcohol acts as a surfactant and drives Marangoni convection that effectively mixes the liquid providing a much higher effective mass diffusivity. The film flow in the presence of the alcohol is noticeably different with a complex, apparently unstructured appearance. The flow activity, which can be easily observed, has never been satisfactorily explained until the recent introduction of the Vapor Surfactant theory. This paper presents a series of experimental results of absorption in an actual chiller facility. The novel features of the work include measurement of the effect of inlet subcooling, discussion of the effect of droplets ejected from the tube bundle and an explanation of the importance of flux in the alcohol augmentation physics.

Sign in / Sign up

Export Citation Format

Share Document