Why doesn't a mass comparison work for the time?
If I have a known fan doing 34K cfm
Use CFM* delta t *1.08 = btu/hr
The aluminum is a set variable.
mass * specific heat * delta T = btu
I understand the temp of the surface will be cooling than the temp of the center.
I am using Bohn and...
Hc = 0.27(Delta T/L)^1/4
Could I model a 20' section as representative of the length with 1 fan at the center line?
Then the Hc could be averaged from center of the fan to the end?
Thanks for the replies.
Good afternoon;
Could someone assist me in verifying my calculation? Or point me in the right direction to a reasonable estimation?
I am attempting to work out a decent mathematical model for cooling round solid rods on a cooling bed. The material needs cooled from a high of 700*F to 150*F...
We are making non-standard large nuts. I can use hex bar stock; final size OD; then bore, and tap to thread. Or I can use a hex OD with round ID tube in which case we final size OD; finish bore and tap to the thread.
The tubing will save considerably on machining costs if the dimensions are...
Could someone please verify my research on the use of bushings in fuel gas pipe?
My understanding from searching on Google is only malleable iron when reducing more than 1 size is acceptable. No Cast Iron.
1209.5.8.4 Metallic Fittings (Including
Valves, Strainers, Filters). [NFPA 54:
5.6.8.4]...
sspeare:
Thank you for the comments. It sounds like this is not a viable option since we never intend to remove heat from the ground. We will end up exactly where we started from with a cooling tower.
If we had access to the river we might be able to make this work.
Thanks all;
Rich
Thank you for the explanation of THR. The heat of rejection is the load created in an HVAC system for changing the state of the refrigerant. In this case there isn't heat of rejection. The application is a cooling system for brazing. There isn't any additional process.
We currently use a...
Our system runs realistically 20 hrs per day ~50 weeks per year 5 days per week.
Wouldn't the flow of ground water transfer the heat? Was it an area which lacks ground water flow?
I will do more research...
sspeare:
Thank you very much your calcs help alot.
Please define for me Heat of rejection??? I am using name plate data in which we will never see the amount of heat due to losses.
As per Ohio Dept of Nat Resources we must dig a minimum of ~20-28' for consistent ground water.
A low burial...
How deep and at what assumed spacing between ground loops for that continuous ground thermal absorption? No Idea. I do not have accurate soil data. Based on some examples on the net it seems at 20' down the temps become stable within +/- 10* which would easily meet the consistency we are after...
