The software provides the recommended values for the global heat transfer coefficient for each wall (including floor and ceiling) function of the temperature difference on each wall.
corridor which don’t directly communicate with the outside corridor which directly communicate with the outside The heat transfer through the walls is calculated taking into account the external temperature and temperature corrections depending the type of the neighboured space, which can be one of the following: technological loads for cooling down and freezing the products
The program is computing all the four types of cooling demands, which have to be known in order to design the refrigerating plant of the refrigerated rooms:
freezing room at positive or negative temperatures. refrigerated room at positive or negative temperatures The comparative results are presented mainly in the form of charts and the most important aspects are commented.ĭepozit is a software developed in turbo Pascal language to compute the cooling demand depending of the type of the refrigerated space, which can be one of the following: The first software named "Depozit" (Refrigerated room in Romanian) is an original computing program, developed by the author at the Technical University of Cluj-Napoca, in Romania and the second software named CoolPack is a free software downloaded from Internet, developed by The Technical University of Denmark. Effects on system performance of such operational parameters as compressor speed, return air in the evaporator and condensing air temperatures have been experimentally evaluated and by means of energy and exergy analysis.The paper is presenting a comparative analysis of the results provided by two softwares designed to compute the cooling demand of refrigerated rooms. The refrigerant and air temperatures, refrigerant pressures, compressor speed, air velocity passing through the evaporator and thermal load were measured. The experiments were conducted at the condensing temperatures of 50-60 oC for each thermal load, and at the compressor speeds of 600, 800, 1000, 1200, 1400 rpm for each thermal load-condensing temperature combination. Various thermal loads in the range of 15 W were applied to the system by means of electric heaters. AAC system equipped with increasing compressor speed by three-phase electric motor controlled by frequency converter. The performance analysis of separate components of AAC system has been carried out under various compressor speeds and thermal loads. For this aim, an experimental AAC system consisting of a laminated type evaporator, swash plate type compressor, a parallel flow type condenser, TXV(thermostatic expansion valve) and a receiver drier. In this paper, a detailed energy and exergy analysis have been dealt with on experimental AAC (Automobile Air Conditioning) system with R134a as working refrigerant.
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