In a condenser of a refrigeration unit, saturated vapor R-134a flows at 0.5 m/s into a 0.5 cm diameter horizontal tube. The tube inside surface temperature is 30ºC and the R- 134a is at 80ºC. Estimate the convective heat transfer coefficient and the expected tube length required for complete condensation of the R-134a. Use hnfg of 106.3 kJ/kg, ?f of 927.6 kg/m3, ?g of 153.8 kg/m3, and cp, ?, and ? at 400C.
What will be an ideal response?
In this problem, the Reynolds number will need to be determined for the character of
the condensate flow. If the Reynolds number is below about 35,000 then the flow is
laminar, and the use of Equation 10-50 can be used to predict the convective heat
transfer coefficient. Using properties for R-134a from Appendix Table B-4, the saturated
You might also like to view...
The type of EM radiation that has wavelength just a bit longer than that of visible light is __________
Fill in the blank(s) with correct word
Point bars typically form
A) on the inside bend of a curved stream channel. B) on the outside bend of a curved stream channel. C) in the middle of a straight stream channel. D) in the middle of a curved stream channel.
Describe two ways that plants and other living things depend on water?
When a proton moves in a direction of the electric field, its potential increases but its potential energy decreases
Indicate whether the statement is true or false