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: 1- Computational fluid dynamics 2- Cross ventilation
cross . . 3-isothermal flow
: Architectural Seience Review, June 1996
. . K- . . CFD . . : 1. Ernest, D. R., Bauman, F.S., Arens, EA, 1991, "The Prediction of Indoor Air Motion for Occupant Cooling in Naturally Ventilated Building", ASHRAE Transactions, Vol. 97 Part 1, pp. 539-552. 2. Gouin, G., 1984 "Contribution Aerodynamique a ['Etude de la Ventilation Naturelle de I'Habitat en Climat Tropical Humide", These de Docteur, Universite de Nantes. 3. Kindangen, J.1., 1994, "Modelisation Aef4ulique en Climat Tropical Humide, d'un Batiment Largement Ouvert surl'Exterieur". Memoire de DEA, CETHIL/EEH, 1nstitut National des Sciences Appliques de Lyon. 4. Celestine, C.,1985, "Ventilation Naturelle et Con fort Thermique dans l'Habitat en Climat Tropical Humide -Approche Experimentale en Vr-J.ie Grandeur de la Ventilation Naturelle sur un Site de la Guadeloupe-Etude Compaf4tiYe en Souffierie", These de Docteur-
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Answer
ACROSS 1. These are the working fluids in air conditioning and heat pump systems. 4. The use of this type of torch is a fast and reliable method of detecting leaks of chlorinated refrigerants. 5. A leak detection method that uses pressurized air or nitrogen in the object to be tested. 7. In this refrigerant safety classification, a Class A indicates concentrations below 400 ppm by volume were not identified, whereas Class B indicates evidence of this. 8. Halogenated refrigerants can be used satisfactorily under normal conditions with piping made of these materials; however, under more severe conditions, some of these materials affect such properties as hydrolysis and thermal decomposition. 9. This is refrigerant No. 729 and has a molecular mass of 28.97. (Hint â&#x20AC;&#x201C; We breath this refrigerant.) 12. The use of these materials in piping of refrigerants should be thoroughly examined under the conditions of intended use because swelling can occur at varying degrees depending on the refrigerant used. 14. R-32, R-125, R-134a, and R-143a are examples of this type of refrigerant and are not regulated by the Montreal
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