Obiettivo To study experimentally and theoretically tubular heat exchangers in which phase change occurs. The objective is to improve the distribution of vapour-liquid mixtures at the entrance and between tubular heat exchanger sections. An experimental and theoretical study has been made of tubular heat exchangers in which phase change occurs. The efficiency of heat exchangers in which phase change occurs, depends strongly on the distribution of the vapour liquid mixture. This is the case in evaporators and condensers with phase change in the tubes. In view of the large number of applications of such heat exchangers (such as in industrial processes, refrigerators, heat pumps), improvements could lead to large energy savings.The programme consists of experimental studies and the development of a model, based on the Computational Fluid Dynamics TRIO Code, which simulates 2 phase (vapour liquid) flow and which was evaluated with data resulting from experimental work.Heat exchangers with air water mixtures were studied on the TRIO Code was validated to include vapour liquid mixtures. A 2-phase heat exchanger was also developed for applications in refrigeration. This will be installed for testing in a 250 kW refrigerator, with R22 as the working fluid. In this experimental set up sensors which measure the mass flow of the vapour liquid mixture will be used.Measurements have been made of maldistribution in shell and tube heat exchangers using a 2-phase probe developed during the project. Data show that improvements could be made to the design of these heat exchangers, leading to better performance (eg increased evaporation duty and reduced pressure drop).The efficiency of heat exchangers in which phase change occurs, depends strongly on the distribution of the vapour-liquid mixture. This is the case in evaporators and condensers with phase change in the tubes. In view of the large number of applications of such heat exchangers (such as in industrial processes, refrigerators, heat pumps), improvements could lead to large energy savings. The programme consists of experimental studies and the development of a model, based on the Computational Fluid Dynamics TRIO Code, which simulates two phase (vapour-liquid) flow and which was evaluated with data resulting from experimental work. Heat exchangers with air-water mixtures were studied by GRETh which were also carried out the validation of its TRIO Code to include vapour-liquid mixtures. CIAT developed a two-phase heat exchanger for applications in refrigeration. This will be installed for testing in a CIAT 250 kW refrigerator, with R22 as the working fluid (HWU). In this experimental set up sensors, which measure the mass flow of the vapour-liquid mixture (developed by CENERTEC), will be used. Campo scientifico engineering and technologymechanical engineeringthermodynamic engineeringengineering and technologyelectrical engineering, electronic engineering, information engineeringelectronic engineeringsensorsnatural sciencesphysical sciencesclassical mechanicsfluid mechanicsfluid dynamicscomputational fluid dynamics Programma(i) FP2-JOULE 1 - Specific research and technological development programme (EEC) in the field of energy - non-nuclear energies and rational use of energy - (JOULE), 1989-1992 Argomento(i) Data not available Invito a presentare proposte Data not available Meccanismo di finanziamento CSC - Cost-sharing contracts Coordinatore Commissariat à l'Energie Atomique (CEA) Contributo UE Nessun dato Indirizzo Centre d'Études de Grenoble Avenue des Martyrs 38041 Grenoble Francia Mostra sulla mappa Costo totale Nessun dato Partecipanti (3) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto COMPAGNIE INDUSTRIELLE D'APPLICATIONS THERMIQUES Francia Contributo UE Nessun dato Indirizzo Rue Jean Falconnier 30 01350 CULOZ Mostra sulla mappa Costo totale Nessun dato Cenertec - Centro de Energia e Tecnologia Lda Portogallo Contributo UE Nessun dato Indirizzo Pç.Dr. Pedro Teot Mostra sulla mappa Costo totale Nessun dato Heriot-Watt University Regno Unito Contributo UE Nessun dato Indirizzo Riccarton, Lord Balerno Building EH14 4AS EDINBURGH Mostra sulla mappa Costo totale Nessun dato