Looking For Online Thermal Loss Calculator Tool

Mex,

At one job I had access to a device that would report the R-value of a wall, but I have never seen the calculation done except by add the R-values of the components.

I'm not completely sure that what you want to do can be done. If one can, it would be nice to know.

I might search more but I get to surf while DW drives and we just crossed into a different state. I don't know what I will have for wire tonight.

Matt

Hi Matt,

Yeah that's the problem - This for six massive made in Mexico refrigeration and freezer cooling units and the only "R" they understand is "Retrograde". Doing three dozen or more differential calculations is not how I had originally planned to spend tomorrow. And my scientific calculator is on the blink (possum), and the service just denied the fourth calculator website download. I thought maybe a tool would be easier.

Two thousand US Dollars in electrical power per month is not a paltry sum. The nearest foam board insulation is a thousand mile round trip, and the space inside a Dodge stake bed dually is just so big. Too thick or too thin incurs embarrassing penalties. So would a second (unneeded) trip.

Yes, I realize about the swing double glass doors, tightness, yadda, seal, yadda, customer leaving door open, yadda. Going to LED interior lighting getting rid of heat manufacturing fluorescent.

But my internet access is only valid 0930 = 1730 hours. Then TelMex and 5 bytes per hour download.

Your interest and help is most appreciated.

If this website doesn't help, I can dig further: Engineering toolbox. I think I may be able to find the one for building structures (was on a machine that crashed). I don't know if that will directly correspond. ISTR, it expressed loss or gain in temperature. From that, one could derive the needed BTU to add/gain to reach a set temp.

Isn't there a direct number to call into a chiller company, asking for needed size of one of their units for a given space? :h That may be easier and more impirical than running your own calculations.

Is the plan to "beef up" the insulation? If so there might just be a phone app that will read thermal images.

http://appcrawlr.com/ios-apps/best-apps-thermal-imaging

and for a calculator:

http://www.linric.com/demos.htm

MEXICOWANDERER wrote:
Inside temp + outside ambient temp versus inside wall temp + outside wall temp and Delta T values. Expressed in BTU's.

Hoping a NERD may have run across an online calculator. Yeah, I'm old, lazy and grouchy so don't criticize.

Thank

You

Google " free Manual J calculator"

Here let me Google that for you (deja vu :B)

Clicky

MEXICOWANDERER wrote:
.... Yeah, I'm old, lazy and grouchy so don't criticize....

Welcome to the club. :B

Could try this. 3E Plus program

If you don't find what you need I have my hand calculations for heat gain in the summer and loss in the winter that I could e-mail you. Once you have the area for your attic, walls and windows it is pretty straight forward. I also have a detailed work sheet that the power company used to provide. I did this back in the first energy crisis around 1976 as a fun engineering project. Based on the calculations, we added more insulation in the attic, installed storm windows and added 2 in. duct insulation over the original 1 in.

Goooogle and download J site links did not load so after spending four hours with IR gun, tablet, calculator, aspirin, and Maalox...

The R factor of the double pane doors is almost identical to the five other sides. So it looks like R-12 is the winner. A 7-1/2 HP 3-phase compressor is not cheap to run 24/7

But I found another culprit. Their auto repair shop across the street is on the same four wire transformer. Their muffler shop wire welder kicks the demand digital meter up 2-full scales and holds it there 5-hours. They are not allowed a second meter and both the store and the shop use 3-phase and C.F.E. does not provide 3-phase transformers. The customers do.

So besides the insulation fix, I am now going to rewire a 6.5 NH Onan genset, then convert it to LPG with remote start/stop stations for the single phase welder. The store has three phase reefers the shop has 3 phase compressors, but relies on a gasoline driven compressor.

Life with Comision Federal de Electricidad, is not easy. Because I use less than 150 kWh every TWO months in my house, CFE has changed meters twice and obviously suspected a meter shunt wire bypass.

What costs perhaps $220.00 monthly in the states, costs more than $1,500 down here. That 30Kw transformer set them back almost six thousand dollars.

Thanks for the suggestions everyone! It turned out to be crucial moral support.

Sure wish I had my old Onan service manuals to do the genset stator re-connect. I'm sure it's presently connected for 65-amp 120vac service.