Current Attempt in Progress\ An overhead 25 -m-long, uninsulated industrial steam pipe of 200-mm diameter is routed through a building whose walls and air are at

25\\\\deg C

. Pressurized steam maintains a pipe surface temperature of

150\\\\deg C

, and the coefficient associated with natural convection is

h=10(W)/(m^(2))*K

. The surface emissivity is

\\\\epsi =0.8

.\ (a) What is the rate of heat loss from the steam line?\ (b) If the steam is generated in a gas-fired boiler operating at an efficiency of

\\\\eta _(f)=0.90

and natural gas is priced at

C_(g)=$0.02

per

MJ

, what is the annual cost of heat loss from the line?\ Physical Properties Mathematical Functions

An overhead 25 -m-long, uninsulated industrial steam pipe of 200-mm diameter is routed through a building whose walls and air are at 25C. Pressurized steam maintains a pipe surface temperature of 150C, and the coefficient associated with natural convection is h=10W/m2K. The surface emissivity is =0.8. (a) What is the rate of heat loss from the steam line? (b) If the steam is generated in a gas-fired boiler operating at an efficiency of f=0.90 and natural gas is priced at Cg=$0.02 per MJ, what is the annual cost of heat loss from the line? Physical Properties Mathematical Functions