Wednesday, September 7, 2016

Calculating Heat Kilowatts and Specific Heat Values

Anderson-Bolds has been providing heating solutions to industry since 1934.

Here is the quick and simple heating equation and variables needed to heat an application.

Required BTU's or KW are calculated with this equation.

WxSHxΔT =BTU/hour

Weight (lb) of material being heated = W
Specific Heat of material = SH
Change in Temperature needed or Delta T = ΔT

To Convert BTUs to KW, divide the BTUs by 3413.

This equation only yields the heat input and does not take into consideration any heat losses or heat gains within a process. If an application is heating water but then a solid piece of metal enters into the water, the solid mud be heated too as well as the tank to achieve the goal system KW required.

Below are specific Heat values for common substances along with weights.
Specific Heats listed are all below 1 except Water which is 1.

Solid weights are per cubic foot and liquid weights are per gallon in pounds.

Aluminum   .23 SH  and  160 pounds
Asphalt       .40  and  65 pounds
Brass    .10  and 525 pounds
Bricks/masonry  .22 and 140 pounds
Carbon  .204  and  ??
Copper  .10  and  550 pounds
Glass   .20  and   165 pounds
Graphite   .20  and  130 pounds
Iron  .13  and  450 pounds
Lead  .031   and   710 pounds
Nickel  .11  and  550 pounds
Paper   .45  and   58 pounds
Paraffin  .70  and 56 pounds
Rubber  .40  and  95 pounds
Silver  .057  and  655 pounds
Solder   .04  and  580 pounds
Steel   .12  and  490 pounds
Sugar  .30  and 105  pounds
Sulphur   .203  and  125 pounds
Tin  .56  and 455 pounds
Wood (oak)  .45  and 50 pounds
Wood (pine)  .45  and 34 pounds

Liquids
Acetic Acid  .472  and 8.81 pounds
Alcohol  .65  and 7.35 pounds
Benzine  .45  and 7.49 pounds
Ether  .503  and  6.15 pounds
Glycerine   .58  and 10.58 pounds
Mercury  .0333  and  113  pounds
Oil   .47   and  7.76  pounds
Petroleum   .51  and 7.49 pounds
Turpentine   .41  and   7.22 pounds
Water   1.0  and  8.34  pounds  (Most Difficult to Heat)

Anderson-Bolds
Since 1934
216-360-9800
www.anderson-bolds.com