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• W1488892635 abstract "This work focuses on the testing and modelling of a bisplit refrigeration system. This system is composed of two evaporating circuits (each circuit consists of an expansion device and an evaporator) connected in parallel inside the same refrigeration unit. The test bench developed in the Laboratory of Thermodynamics is briefly described and the influence of the refrigerant charge effect on the system global performance is examined. The modelling of a bisplit chiller is also studied and a first model validation is given. INTRODUCTION The most simple refrigeration system is made up of four basic components: an evaporator (low pressure level), a compressor, a condenser (high pressure level) and an expansion device. This kind of system is usually used when only one cooling demand is needed. However two or more cooling demands would require two or more simple chillers which is obviously not the optimal solution: this would considerably increase the required space as well as the global plant cost. That is why many air conditioning systems often comprise several evaporators connected in parallel inside the same refrigeration unit: a « multisplit » system is obtained. A drawback of this system is that it requires quite a complicated control strategy. For instance, the use of a multisplit system is recommended for the household air conditioning and for the food storage in supermarkets. The objective of this work is double. The first aim is to design and develop a test bench of a bisplit system and to carry out steady-state tests with different refrigerant charges. These tests must lead to a good understanding of the actual charge effect on the system global performance. The second aim is to develop a general model of a two-evaporator refrigeration system (« bisplit » system ); this model should help the user to design a whole bisplit chiller properly thanks to an appropriate selection of the basic components. This work is the continuation of a first study described in [1]. DESCRIPTION OF THE TEST BENCH The bisplit refrigeration system is shown in Figure 1; the refrigerant used is HCFC-22. The main components are as follows: (i) a hermetic scroll compressor installed inside a calorimeter; (ii) a coaxial water-cooled condenser. This condenser is fixed to a force transducer so that the refrigerant charge inside the condenser can be measured during the tests; (iii) a condensing pressure regulator located on the water circuit and connected to the compressor discharge. This regulator adjusts the water flow rate through the condenser in order to obtain the desired condensing pressure; (iv) two evaporating circuits connected in parallel. Each circuit is composed of a thermostatic expansion valve (external pressure equalisation) and a direct expansion coil; (v) an evaporating pressure regulator located at the outlet of one evaporator. This regulator allows the system to operate with two different evaporating temperatures; (vi) a capacity regulator with a hot gas bypass; (vii) an auxiliary heat exchanger used to adjust the compressor inlet temperature in order to keep the discharge temperature within an admissible range." @default.
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• W1488892635 date "1996-01-01" @default.
• W1488892635 modified "2023-09-24" @default.
• W1488892635 title "Testing and Modelling of a Bisplit Refrigeration System" @default.
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