Experimental investigation of an ammonia-water-hydrogen diffusion absorption refrigerator. (15th December 2019)

• Record Type: Journal Article
• Authors: Najjaran, Ahmad; Freeman, James; Ramos, Alba; Markides, Christos N.
• Is Part Of: Applied energy. Volume 256(2019)
• Publication Date: 2019-12-15
• Subjects: Diffusion absorption refrigeration -- Absorption cooling -- Ammonia-water -- Coefficient of performance -- Part-load operation; Power (Mechanics) -- Periodicals; Energy conservation -- Periodicals; Energy conversion -- Periodicals; 621.042
• DOI: 10.1016/j.apenergy.2019.113899
• Languages: English
• ISSNs: 0306-2619

Abstract

Highlights: A newly-proposed DAR unit for solar applications is tested in laboratory conditions. The unit is larger than conventional DARs with a nominal cooling power of 100 W. Larger condenser and absorber surface areas are used to promote heat rejection. The cooling power is measured directly by an air-coupling configuration. The experimental data are used to validate a popular DAR design model. Abstract: Diffusion absorption refrigeration (DAR) is a small-scale cooling technology that can be driven purely by thermal energy without the need for electrical or mechanical inputs. In this work, a detailed experimental evaluation was undertaken of a newly-proposed DAR unit with a nominal cooling capacity of 100 W, aimed at solar-driven cooling applications in warm climates. Electrical cartridge heaters were used to provide the thermal input which was varied in the range 150–700 W, resulting in heat source temperatures of 175–215 ° C measured at the generator. The cooling output during steady-state operation was determined from the power consumed by an electric heater used to maintain constant air temperature in an insulated box constructed around the evaporator. Tests were performed with the DAR system configured with the default manufacturer's settings (22 bar charge pressure and 30% ammonia concentration). The measured cooling output (to air) across the range of generator heat inputs was 24–108 W, while the coefficient of performance (COP) range was 0.11–0.26. The maximum COP was obtained at a generator heat input of 300 W. Results were compared to performance predictions from a steady-state thermodynamic model of the DAR cycle, showing a reasonable level of agreement at the nominal design point of the system, but noteworthy deviations at part-load/off-design conditions. Temperature measurements from the experimental apparatus were used to evaluate assumptions used in the estimation of the model state point parameters and examine their influence on the predicted system performance.