Asked by Anonymous
The R-factor for housing insulation gives the thermal resistance in units of ft2 °F h/BTU. A good wall for harsh climates, corresponding to about 10 in of fiberglass, has R = 45 ft2 °F h/BTU.
a) Determine the thermal resistance (in m2 K/W) in SI units.
b) Find the heat flow per square meter through a wall that has insulation with an R-factor of 45, with an outside temperature of -21.1 °C and an inside temperature of 24.1°C.
a) Determine the thermal resistance (in m2 K/W) in SI units.
b) Find the heat flow per square meter through a wall that has insulation with an R-factor of 45, with an outside temperature of -21.1 °C and an inside temperature of 24.1°C.
Answers
Answered by
bobpursley
dQ/dt= dTemp/R= 45.2/45 Btu/hr
a. 1 ft^2 F hr/BTu= Lord chaning units..
1m^2=10.76ft^2
1 BTU=1055 joule
1 watt= 3600Joule/hr
ok, then 1 BTU/hr=1055*3600/hr
now for the conversion
1ft^2(1m^2/10.76ft^2)*F*(9K/5F)/(1055*1036 W/hr)
and you can check that, and multiply it out.
a. 1 ft^2 F hr/BTu= Lord chaning units..
1m^2=10.76ft^2
1 BTU=1055 joule
1 watt= 3600Joule/hr
ok, then 1 BTU/hr=1055*3600/hr
now for the conversion
1ft^2(1m^2/10.76ft^2)*F*(9K/5F)/(1055*1036 W/hr)
and you can check that, and multiply it out.
Answered by
Anonymous
it's wrong i think, i cannot understand
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.