Need help regarding heat transfer questions

  • Thread starter wattsie10
  • Start date
  • #1
1
0
Please can someone show me how to work out the following questions.

1) A hot water cylinder holds 500 litres. If the primary heat source is 30kW and the supply water inlet to the cylinder is 12°C, how long will it take to heat the whole tank to 60°C?

2) The primary side of a plate heat exchanger rated at 400kW has an inlet temperature of 85°C and the outlet temperature is 40°C. What is the mass flow rate?

3) To achieve a water flow rate of 5kg/s at 20°C from a 210kW source, what would be the temperature of the water as it enters the heat exchanger?

Many thanks

Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
tiny-tim
Science Advisor
Homework Helper
25,832
251
Welcome to PF!

Hi wattsie10! Welcome to PF! :wink:

Show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:
 

Related Threads on Need help regarding heat transfer questions

Replies
7
Views
604
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
0
Views
820
  • Last Post
Replies
3
Views
956
  • Last Post
Replies
9
Views
9K
  • Last Post
Replies
10
Views
3K
  • Last Post
Replies
0
Views
2K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
1
Views
1K
Replies
1
Views
986
Top