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    Design and analysis of a water-ammonia absorption refrigeration system
    (Professional Engineering Publishing Ltd, 2000) Koc, A; Bulgan, AT; Öztürk, NA
    A water-ammonia absorption refrigeration (AAR) system is preferred to classical vapour compression when a heat source is available cheaply. This study deals with the analysis of an AAR system operating with a low-temperature heat source. Eleven design variables were chosen for this purpose. The analysis showed that the use of a low temperature heat source imposes some restrictions on the system design, but an economically operating AAR system may be designed by a careful process optimization study.
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    Investigation of thermodynamic properties of alternative fluid couples for absorption thermal systems
    (Pergamon-Elsevier Science Ltd, 2000) Bulgan, AT; Koc, A; Öztürk, NA
    One of the reasons for depletion of the ozone layer of the atmosphere is the use of materials in different industrial brands which have disintegrating effects on ozone in their compositions. It is known that thermodynamic analysis of the operating processes of machines and systems that use heat energy depends on calculations of the heat transfer processes of parts of the system and choices of the thermohydrodynamic regimes and parameters. In this study, an experimental investigation is conducted on the thermal properties which are close to the curves of liquid and two phase boiling and condensing of two new fluid couples for absorption cooling systems, and absorption heat pumps which are better ecologically. The obtained results are analyzed, and new equations are given. Experiments are done for methanol-LiBr and methanol-LiCl solutions with changes of pressure, changes of temperature and concentrations of solutions in the ranges of 0.1-40 MPa, 298-498 K, 2-12%, respectively. During the experiments, extreme care is taken to keep the solution concentration stable, and the obtained results are analyzed in different thermodynamical coordinates. State equations are constructed according to the values of specific volume, and the main thermodynamical properties are calculated with the use of the differential equations of thermodynamics. Values related with these calculations are given in tables. (C) 2000 Elsevier Science Ltd. All rights reserved.