Recent content by nickbone59

i still don't understand? what your saying just doesn't make sense? Does the surface convective heat transfer coefficient not come into it?

actually i am still a bit unsure on how i calculate the temperature difference through the insulator from the temperature of the outer and the conductivity.

Homework Statement Exhaust gas expands through a nozzle whose isentropic efficiency is 88%. The inlet pressure and temperature are 1.6 bar and 400c respectively. At outlet the pressure has fallen to an ambient level of 1.013 bar. Given that the inlet velocity is negligible, and Cp and...

Any suggestions anyone? Really struggling with this one ! Homework Statement A domestic radiator is 2.5 m long and 0.6m high and is sited in a room whose temperature is 14C. Hot water is circulating through the radiator at a temperature of 90c. The radiator is convecting heat from both sides...

thank you thanks that's a great help, hopefully i can suss it out now, thanks again.

Hey, have been working on this question for about 2 weeks now and can't crack it, I found a formula on the net which gives me a value of just over 30C, i am not confident i have the correct value though. It just seems too low. I anyone could point me in the right direction with this it would be...