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  1. billn

    sizing earthen thermal storage

    I just installed storage cells under my house using quarry fill with water circulation tubes. 3 separate insulated containers totaling about 80 tons. If I could heat them up to 110 deg F and deplete the temperature to 90, assume a 30 deg F. delta T, how many BTU's could I get out and at what...
  2. billn

    allowable stress in rebar ??

    I am designing a slab on grade and need a design number for allowable stress in steel rebar. I used 30,000 PSI and the amount of steel the equasion came up with seems too high. If I allow more stress, I can reduce the steel a bit. <br> Thanks, <br> Bill<br>

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