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48 Nicolae Bara and Marin Bica Fig. 3 –Cooling efficiency depending on the rib step. 4. Conclusions 1. For surfaces with sinusoidal ribs, specialty literature data regarding the behavior of these heat transfer surfaces is poor. Some recent data are obtained on the computer and it substantially deviate from the values obtained by experimental research, showing that theoretical models are still improvable. 2. Theories about the entry effect and the effect of the boundary layer release from the sinusoidal rib demonstrated by complex experimental research open opportunities for thermally superior devices in relation to existing devices. These results have led to research for the development of exchangers with the two fluids in counter current flow. 3. Research on new constructive solutions obtaining for heat exchangers in refrigeration systems has highlighted the importance of ribs surface quality and of the step got in their fabrication. 4. Obtaining much better thermal efficiency leads to vehicles total mass decreasing and fuel consumption reducing with direct implications in limiting environmental pollution.
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 49 REFERENCES * * * Thermal Management for Heavy Vehicles (Class 7 -8 Trucks). Workshop Report and Multiyear Program Plan (Draft), U.S. Department of Energy, Office of Heavy Vehicles Technologies, 2000. Bică M., Nagi M., Transfer de masă şi căldură. Universitaria, Craiova, 1999. Chiriac F., Chiriac V., Cristea A., An Alternative Method for the Cooling of Power Microelectronics Using Classical Refrigeration. Thermal Issues in Emerging Technologies, ThETA 1, Cairo, Egypt, Jan 3-6, 2007. Frank P., Incropera F., DeWitt D., Fundamentals of Heat and Mass Transfer. Wiley & Sons, 2002. Gray A., The Growth of Aluminum in Automotive Heat Exchangers. Innoval Technology Limited, Banbury, OX16 1TQ, UK, 2005. Natarajan V., Convective Heat Transfer from a Stacked Electronic Package. ThETA 1, Cairo, Egypt, 2007. INFLUENŢA FACTORILOR DE MEDIU ŞI CONSTRUCTIVI ASUPRA PERFORMANŢELOR VAPORIZATOARELOR (Rezumat) Proiectarea şi alegerea corectă a vaporizatoarelor are o importanţă mare pentru funcţionarea corectă a instalaţiilor frigorifice şi pentru eficenţa acestora. Un vaporizator greşit dimensionat poate să producă o scădere excesivă a temperaturii de vaporizare, iar la reducerea acesteia cu fiecare grad, corespunde şi o reducere a puterii frigorifice cu cca. 3…4%. Acesta este şi motivul pentru care nu se poate disocia vaporizatorul de sistemul său de alimentare cu lichid. În practică, adesea fiecărui tip de vaporizator îi corespunde un sistem propriu de destindere a agentului frigorific. Pe standul din Laboratorul de Termotehnică de la Facultatea de Mecanică din Craiova s-au efectuat măsurători pentru un vaporizatoare cu pasul nervurii cuprins între 2 mm şi 3,5 mm. Răcirea cea mai pronunţată a aerului se produce la pasul nervurii de 2 mm. Se confirmă afirmaţia că pasul nervurii trebuie ales pentru fiecare tip de schimbător căldură în parte, în urma unor încercări minuţioase pe standurile de probe.
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