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Why calculate gas usage (BTU/lb. of H20 removed)?   There are two main reasons. 

Check your new dryer's efficency and compare the results every 6-months.  You may catch problems,  like seal wear, back pressure issues, etc., before they eat into your energy bill.  Use poor results from older dryers to justify replacement.   

CALCULATING GAS USAGE 

1.  TO COMPUTE MOISTURE RETENTION

      EXAMPLE (400-lb. Capacity Dryer):

          Weight of load after extraction:    650 pounds

          Weight of load after drying:        - 400 pounds

          Amount of water removed:           250 pounds

 Divide water removed by dry weight:   

 250-lb. water   /  400-lb. dry weight   =   63% Retention

 

2.  TO COMPUTE WATER REMOVAL RATE PER MINUTE

      EXAMPLE:

 Divide amount of water removed by the load heat time.

          Water out = 250 pounds / 13 min. heat time

                             = 19.23 lb. of Water Removed Per Min.

 

3.  TO COMPUTE BTU PER POUND OF WATER REMOVED

Dryer must have a gas meter installed or all other gas equipment must be turned off.  This will allow the use of the plant oil supply meter.

Meter or count the cubic feet of gas consumed for that particular load and multiply it by the BTU content of your gas (contact your local gas company for content).

EXAMPLE:

475 cubic feet X 1050 BTU (content) = 498,750 BTU's used

Divide BTU used by pounds of water removed.

          498,750 BTU / 250-lb. H2O

                    = 1995 BTU per lb. of H20 removed

 

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