• Support PF! Buy your school textbooks, materials and every day products Here!

Biomedical Engineering: power (W) needed to warm blood

  • #1

Homework Statement


Fast-flow blood warmers (pictured below) can be used to heat blood products (carefully and uniformly) when rapid, high-volume transfusions are necessary, in order to prevent hypothermia in the patient. The blood product density and specific heat can be assumed to be 1.12 g/cm3 and 3.8 kJ/kgK, respectively. If the blood product initially is at 8 degrees Celcius, the target temperature is 37 degrees Celcius, and the maximum transfusion rate is 900 ml/h, what is the theoretical heating power (W) needed for this machine?
Smiths-Level-1.jpg


Homework Equations


q=mcΔT
W=J/s
Density=m/V

The Attempt at a Solution


Sorry, this is a new type of problem that our prof. gave, and he also gave no hint/formula so I am lost. Where do you implement the transfusion rate in the calculation? Do I treat it as the volume?
 
Last edited:

Answers and Replies

  • #2
billy_joule
Science Advisor
1,200
330
Use your first equation to find energy to heat the 900ml.
Use the second equation to find the power required to do it in one hour.
Or combine the equations to do it all in one step.
 
  • #3
Use your first equation to find energy to heat the 900ml.
Use the second equation to find the power required to do it in one hour.
Or combine the equations to do it all in one step.
Thank you :)
 
  • #4
Hamza313

Homework Statement


Fast-flow blood warmers (pictured below) can be used to heat blood products (carefully and uniformly) when rapid, high-volume transfusions are necessary, in order to prevent hypothermia in the patient. The blood product density and specific heat can be assumed to be 1.12 g/cm3 and 3.8 kJ/kgK, respectively. If the blood product initially is at 8 degrees Celcius, the target temperature is 37 degrees Celcius, and the maximum transfusion rate is 900 ml/h, what is the theoretical heating power (W) needed for this machine?
View attachment 190432

Homework Equations


q=mcΔT
W=J/s
Density=m/V

The Attempt at a Solution


Sorry, this is a new type of problem that our prof. gave, and he also gave no hint/formula so I am lost. Where do you implement the transfusion rate in the calculation? Do I treat it as the volume?
please tell me how you figured this out because I actually have like the exact question on my homework, thank you.
 

Related Threads for: Biomedical Engineering: power (W) needed to warm blood

  • Last Post
Replies
8
Views
774
Replies
0
Views
1K
Replies
0
Views
2K
Replies
4
Views
5K
  • Last Post
Replies
0
Views
942
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
4
Views
2K
Replies
2
Views
2K
Top