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70 Ionel Ivancu et al. Gut J.A.W., Pinto J.M., Modelling of Plate Heat Exchangers with Generalized Configurations, International Journal of Heat and Mass Transfer, 46, 14, 2571- 2585 (2003). Gut J.A.W. et al., Thermal Model Validation of Plate Heat Exchangers with Generalized Configuration. Chemical Engineering Science, 59, 21, 4591-4600 (2004). Galeazzo F.C.C. et al., Experimental and Numerical Heat Transfer in a Plate Heat Exchanger. Chemical Engineering Science, 61, 21, 7133-7138 (2006). MODELAREA UNUI SCHIMBĂTOR DE CĂLDURĂ CU PLĂCI ÎN CURENT ÎNCRUCIŞAT (Rezumat) În lucrare este prezentat un schimbator de căldură cu plăci, în curent încrucişat, ce aparţine instalaţiei experimentale, cu dimensiunile şi materialul din care este realizat. Fluidele care trec prin schimbător sunt aerul şi gazele de ardere. Ca date iniţiale pentru modelarea schimbului de căldură s-au utilizat presiunea p1 , viteza c1 şi temperatura t1 fluidului în regim de intrare. Modelele au fost realizate cu ajutorul programului CATIA iar pentru realizarea distribuţiei de temperaturi a fost folosit modulul STEADY-THERMAL din programul ANSYS. Modelarea a fost făcută în ipoteza curgerii laminare. În urma modelării s-au obţinut distribuţiile de temperatură şi presiune. Modelarea oferă informaţii utile privind variaţia parametrilor aerului la curgerea prin schimbătorul de căldură.
BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică „Gheorghe Asachi“ din Iaşi, Tomul LVIII (LXII), Fasc. 4, 2012 Secţia CONSTRUCŢII DE MAŞINI EXPERIMENTAL RESULTS ON A VAPOUR INJECTION SCROLL COMPRESSOR BY ION ZABET 1 and GRAŢIELA-MARIA ŢÂRLEA ∗2 1 Romanian General Association of Refrigeration of Bucharest, 2 Technical University of Civil Engineering of Bucharest Received: September 12, 2012 Accepted for publication: November 20, 2012 Abstract. This paper presents experimental results from a vapour injection scroll compressor system. The purpose of this paper is to test a vapour injection scroll compressor for a heat pump. For the measurements, the inputs were given by different pressure values (evaporation and condensation process). On this test rig we mount a pressure sensor on the evaporator supply and a new system of expansion valves. This new system of the expansion valves allow us to extend the tests matrix to a wide range of capacities and a higher control over the system. The expansion valves are mounted three on the evaporator and two on the injection evaporator. The work is conducted in two phases: the first phase of the rig consists in the set-up of a test rig, its instrumentation, the calibration of the measurements devices, the set-up of the data acquisition system and a few verification tests and the second phase consists in the achievement of the 100 tests. The last part of the paper presents the results obtained by the experimental model. These results are: performance coefficient, power consumption, exhausted compressor temperature and refrigerant charge of the refrigerant R404A in different working conditions. Key words: vapour injection scroll compressor, exhausted compressor temperature, refrigerant charge and heat exchanger. 1. Introduction The purpose of this study is to test a vapour injection scroll compressor and find a simplify model for a heat pump (Lemort, 2008), (Winandy & Lebrun, ∗ Corresponding author: e-mail: gratiela.tarlea@gmail.com
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