scholarly journals Low-source-temperature diffusion absorption refrigeration. Part II: Experiments and model assessment

2016 ◽  
Vol 65 ◽  
pp. 312-329 ◽  
Author(s):  
Alexander S. Rattner ◽  
Srinivas Garimella
Keyword(s):  
Model Assessment ◽  
Absorption Refrigeration ◽  
Source Temperature ◽  
Temperature Diffusion ◽  
Diffusion Absorption

Experimental Study on LiNO3-NH3 Diffusion-Absorption Refrigeration System

2011 ◽  
Vol 474-476 ◽  
pp. 2335-2340 ◽  
Author(s):  
Han Dong Wang
Keyword(s):  
Solar Energy ◽  
Heat Source ◽  
Air Conditioning ◽  
Waste Heat ◽  
Absorption Refrigeration ◽  
Source Temperature ◽  
Industry Waste ◽  
Heat Source Temperature ◽  
Refrigeration Capacity ◽  
Diffusion Absorption

In order to utilize solar energy and industry waste heat to reduce electricity consumption in heating, ventilating, air conditioning and refrigerating (HVAC&R) engineering, the authors developed a new style diffusion-absorption refrigeration (DAR) system. It can be driven by heat sources with low temperature, and in which LiNO3-NH3-He is used as working fluids and a spray absorber with a solution cooler is designed to enhance the mass and heat transfer, respectively. What presented here is about the modified experiment set and the latest experiment results. The experiments show that the system can start to operate when the temperature of heat source (hot water) reaches to 60°C and it can meet the temperature requirement of air conditioning when heat source temperature varies in the range of 70～83°C. The evaporating temperature varies from 10～-13°C at various absorbing temperatures when heat source temperature reaches the level of 83～95°C. The corresponding refrigeration capacity and coefficient of performance (COP) varies in the range of 1.90～4.22kW and 0.177～0.332, respectively. It is also found that the evaporating temperature, refrigeration capacity and COP are so sensitive to absorbing temperature rather than generating or condensing temperature that the absorbing temperature can be used to regulate the working condition and parameters of the DAR system, e.g. by means of modulating the flow rate of cooling water circulating in the solution cooler equipped to the spray absorber. Thus, in the fields with plenty of solar energy or industry waste heat, the new style DAR system can be considered as an ideal candidate for utilizing low-grade energy, saving energy and reducing emission.

A Parametric Examination of the Factors Affecting the Performance of a Diffusion Absorption Refrigeration System

2021 ◽  
pp. 1-38
Author(s):  
Noman Yousuf ◽  
Timothy Anderson ◽  
Roy Nates
Keyword(s):  
Waste Heat ◽  
Operating Conditions ◽  
Design Parameters ◽  
Working Fluid ◽  
Low Grade ◽  
Absorption Refrigeration ◽  
Factors Affecting ◽  
Thermally Driven ◽  
Mass Flowrate ◽  
Diffusion Absorption

Abstract Despite being identified nearly a century ago, the diffusion absorption refrigeration (DAR) cycle has received relatively little attention. One of the strongest attractions of the DAR cycle lies in the fact that it is thermally driven and does not require high value work. This makes it a prime candidate for harnessing low grade heat from solar collectors, or the waste heat from stationary generators, to produce cooling. However, to realize the benefits of the DAR cycle, there is a need to develop an improved understanding of how design parameters influence its performance. In this vein, this work developed a new parametric model that can be used to examine the performance of the DAR cycle for a range of operating conditions. The results showed that the cycle's performance was particularly sensitive to several factors: the rate of heat added and the temperature of the generator, the effectiveness of the gas and solution heat exchangers, the mass flowrate of the refrigerant and the type of the working fluid. It was shown that can deliver good performance at low generator temperatures if the refrigerant mass fraction in the strong solution is made as high as possible. Moreover, it was shown that a H2O-LiBr working pair could be useful for achieving cooling at low generator temperatures.

scholarly journals Dynamic investigation of the diffusion absorption refrigeration system NH 3 -H 2 O-H 2

2017 ◽  
Vol 10 ◽  
pp. 468-474 ◽  
Author(s):  
Mohamed Izzedine Serge Adjibade ◽  
Ababacar Thiam ◽  
Christophe Awanto ◽  
Baye A. Ndiogou ◽  
Vincent Sambou
Keyword(s):  
Absorption Refrigeration ◽  
Refrigeration System ◽  
Absorption Refrigeration System ◽  
Dynamic Investigation ◽  
Diffusion Absorption
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