NoHoCa
Mechanical
- Jun 19, 2006
- 32
I'm looking at aeration headers delivering compressed air from blowers. Thanks to those in a previous thread who helped me debug head loss calcs.
Anyway, today I'm looking at average temperature of air in the pipe. Since the pipe is uninsulated, I'm iterating heat transfer equations in order to predict heat loss and thus temperature at the end of the pipe run. These calcs rely on accurate gas properties. I know that air density can be approximated at temp & press using the ideal gas relationship.
---> However I'm not so sure about Specific Heat and Kinematic Viscosity. I've checked MERM and some online references but I'm not sure how to get *actual* Cp and visc. since the tabulated values normally reference a range of temps at 'standard' pressure. Whereas our average pressure is about 9 psig. Any ideas on this?
Anyway, today I'm looking at average temperature of air in the pipe. Since the pipe is uninsulated, I'm iterating heat transfer equations in order to predict heat loss and thus temperature at the end of the pipe run. These calcs rely on accurate gas properties. I know that air density can be approximated at temp & press using the ideal gas relationship.
---> However I'm not so sure about Specific Heat and Kinematic Viscosity. I've checked MERM and some online references but I'm not sure how to get *actual* Cp and visc. since the tabulated values normally reference a range of temps at 'standard' pressure. Whereas our average pressure is about 9 psig. Any ideas on this?
