An experimental unit has been built to analyse trans-critical carbon dioxide refrigerating cycles in general, and to test CO{sub}2 hermetic reciprocating compressor prototypes in particular. The experimental data has also allowed to numerically compare not only each element, but also all the whole refrigerating system. A description of the numerical compressor prototype is presented and studied in a companion paper. The objective of this work is to show the hermetic reciprocating compressor CL15 that has been built, to work with carbon dioxide as fluid refrigerant under a trans-critical cycle. A complete description of the experimental equipment and the instrumentation used is also included. Finally, the present paper presents extensive comparative experimental results under different working conditions considering low evaporation temperatures, high evaporation temperatures, and different superheating and gas cooler pressures. The results obtained show a promising expectation. Comparative results between the numerical study and the experimental validation of the whole refrigerating cycle is also presented in another companion paper.
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