Search results for query: *

Thanks all.

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.

So can I use the following for the calculation? https://www.engineersedge.com/heat_transfer/convection.htm Thanks

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...

low carbon steel. arcillor mittal may have the material. I will have a quote tomorrow. I was hoping to find more than 1 vendor in the states. Rich

Anyone have a line on who make 5.5" bar stock or tube with no more than a 3.5" bore? Thanks Rich

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...

Yes 273K BTU/hr

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...

We are looking at replacing a Cooling tower with Geothermal Cooling for a process water loop. 80KW total power usage. 10*F temp differential on cooling tower design 20*F temp design differential on system operating pressure 30psi If we move to geothermal cooling our temp differential will be...

tHANK YOU FOR THE COMMENTS GENTLEMEN. sorry for the caps. Does NFPA 54 cover allowable materials for flexible connections? I have recently found out we use something similar to red rubber hose and wish to back up a change to more substantial and safer flexible connections. Does natural gas...

Local gas company at our present location supplies 15" WG The new Gas company supplies 7" or 2psi. As per Katmar 2psi is ~55" WG. The pressure is left to my discretion and I chose to compare pressures as supplied by the new gas company. So I first assessed for 7" WG assuming and compared...

THANK YOU.

I was using BTusince the tables were listed in BTU. In Volume I am using the conversion 1000 BTu/hr to 1cfm. Thank you very much for the comments.