1. Engineering
  2. Mechanical Engineering
  3. help please...

Question: help please...

Question details
Help please
Problem 1.022 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°C Pressurized steam maintains a pipe surface temperature of 225°C, and the coefficient associated with natural convection is -10 W/m2-K. 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 0.90 and natural gas is priced at c, $0.02 per MJ, what is the annual cost of heat loss from the line? Step 1 Your answer is incorrect. Try again. Find the heat loss by convection from the pipe, in kW. kw the tolerance is +/-2% By accessing this Question Assistance, you will learn while you earn points based on the Point Potential Policy set by your instructor. Step 2 Your answer is incorrect. Try again. Find the heat loss by radiation from the pipe, in kW. kw the tolerance is +/-296 By accessing this Question Assistance, you will learn while you earn points based on the Point Potential Policy set by your instructor. Step 3 What is the total rate of heat loss from the steam line, in kw? kW the tolerance is +/-296 By accessing this Question Assistance, you will learn while you earn points based on the Point Potential Policy set by your instructor.
Step 4 Find the total annual energy loss from the pipe, in MJ Eloss the tolerance is +/-290 MJ By accessing this Question Assistance, you will learn while you earn points based on the Point Potential Policy set by your instructor. Attempts: O of 3 used SAVE FOR LATER SUBMIT ANSWER Step 5 Solve for the annual cost of the heat loss from the pipe, in dollars. Annual Cost the tolerance is +/-2% By accessing this Question Assistance, you will learn while you earn points based on the Point Potential Policy set by your instructor. Attempts: O of 3 used SAVE FOR LATER SUBMIT ANSWER
Solution by an expert tutor
Blurred Solution
This question has been solved
Subscribe to see this solution