Experimental investigations and modelling of a small capacity diffusion-absorption refrigerator in dynamic mode.
Author(s) : MANSOURI R., BOUROUIS M., BELLAGI A.
Type of article: Article
Summary
This paper reports on the experimental investigations in a non-steady state mode of a small capacity commercial diffusion-absorption refrigerator (DAR) and the development of a dynamic black-box model for the machine. For these investigations, the refrigerator was equipped with the appropriate metrology. Temperature time variations of the refrigerated room and of the ambient conditions were measured, monitored, and stored using a data acquisition unit connected to a computer. A standardized experimental procedure was used to determine the overall heat conductance of the refrigerated room: A value of (UA)cab(UA)cab = 0.554 W K-1 was found. The time evolution of the cooling capacity for different driving heat inputs to the refrigerator was investigated. Based on the experimental data, a dynamic black-box model was developed using the Matlab identification package to correlate the power input to the generator and the cooling capacity of the refrigerator. A first order transfer function with a delay was found to describe quite accurately the time evolution of the cooling capacity for all considered heat rates supplied to the generator. In a further step, regressed analytical expressions of the transfer function parameters, as a function of the generator heat supply, were incorporated into the cooling capacity function. A generalized dynamic black-box model for the DAR system was thus obtained and was then validated using the Matlab Simulink® environment. The predictions made by the model were found to be well in agreement with the experimental data. In particular, the predictions for COPCOP under steady state conditions agreed satisfactorily with the experimental data yielding a maximum relative deviation of about 8%.
Details
- Original title: Experimental investigations and modelling of a small capacity diffusion-absorption refrigerator in dynamic mode.
- Record ID : 30021060
- Languages: English
- Source: Applied Thermal Engineering - vol. 113
- Publication date: 2017/02/25
- DOI: http://dx.doi.org/10.1016/j.applthermaleng.2016.11.078
Links
See other articles in this issue (24)
See the source
Indexing
- Themes: Absorption and adsorption systems
- Keywords: Transient state; Refrigerator; Ammonia; Absorption system; Cooling capacity; Modelling; Hydrogen; Expérimentation; Water
-
Experimental analysis of diffusion absorption r...
- Author(s) : ADJIBADE M. I. S., THIAM A., AWANTO C., et al.
- Date : 2017/09
- Languages : English
- Source: Case Studies in Thermal Engineering - vol. 10
- Formats : PDF
View record
-
The elaboration of the model on the generation ...
- Author(s) : CUBJA L., PORNEALA S.
- Date : 2005
- Languages : English
- Source: Ann. Univ. Dunarea Jos Galati, IV - vol. 19
View record
-
DETERMINATION DU DEBIT GAZEUX D'UN SYSTEME A AB...
- Author(s) : GALAIS A., CLODIC D.
- Date : 1991/08/10
- Languages : French
- Source: New challenges in refrigeration. Proceedings of the XVIIIth International Congress of Refrigeration, August 10-17, 1991, Montreal, Quebec, Canada.
- Formats : PDF
View record
-
Absorption-diffusion refrigerators: modelling a...
- Author(s) : BUZ V. N.
- Date : 2001
- Languages : English
- Source: Non-compression refrigeration and cooling. Proceedings of the Second International Workshop.
View record
-
Absorption-diffusion refrigerators. Work analys...
- Author(s) : BUZ V.
- Date : 1997/09/15
- Languages : English
- Source: 3rd International Seminar on heat pipes, heat pumps, refrigerators. Proceedings.
View record