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Investigation expérimentale du comportement transitoire de machines frigorifiques : Cas des échangeurs à plaques et des échangeurs à tubes et calandre

Abstract : The purpose of this work is to evaluate the transient behaviour of refrgerators during various operating transients. A experimental stydy is realized on two different machines : the first one is a 60 kW liquid chiller with shell-and-tubes heat exchangers. The second one is a 10 kW liquid chiller with plate heat exchangers. Both of the machines work with refrigerant R-407C. The study of chiller equipped with shell-and -tubes exchangers points out that the transcients are sensitive to the shut down period and to the static superheat of the themostatic expansion valve. Moreover the transcients due to any variations (start-up, power change, mass flow rate change) lead to a disturbed and violent transients in the lower pressure side. Finally, concerning the use of the refrigerant R407C, a important composition glide is observed during start-up and shutdown transcients. The study of the lower power chiller deals with the global behaviour in the first time. Then the plate evaporator is locally studied by measuring the wall temperature, the water temperature and the refrigerant temperature. The behaviour of this chiller is rather different than the first one. Superheat instabilities appear for a range of refrigerant mass flow rate of 195 kg/h to 205 kg/h. Moreover the fiow distribution at the inlet of the evaporator should influence the transient. Finally, the measured beat transfer coefficient of the refrigerant points out that usual correlations underestimate strongly the heat transfer in the post-dryout zone. This result is explained by the liquid droplets in the vapour core, which increase the heat transfer.
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https://hal.univ-lorraine.fr/tel-01746506
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Stéphane Colasson. Investigation expérimentale du comportement transitoire de machines frigorifiques : Cas des échangeurs à plaques et des échangeurs à tubes et calandre. Autre. Université Henri Poincaré - Nancy 1, 2001. Français. ⟨NNT : 2001NAN10205⟩. ⟨tel-01746506⟩

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