Three cylindrical wells are dug as part of a ground source heat pump system. Each well is 9 inches in diameter and 100 feet deep. How many cubic feet of sand are needed to backfill the wells? Round the answer to the nearer hundredth cubic feet.
Fill in the blank(s) with the appropriate word(s).
132.54 cu ft
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Which statements below are true regarding comparison of district heat to on site boilers? Select all that apply.
A) The cost per mmBtu for district steam will be lower than the cost for gas used on site boilers. B) District steam complicates the design by the need for steam piping throughout the building. C) Reduction in mechanical space and eliminating flues is a major saving by using district steam. D) If steam cost rises, it's easy to convert back to a boiler system.
A LePelletier gear set is a combination of a simple planetary set and a ________ gear set.
A) Simpson B) Reverse C) Spur D) Ravigneaux
Two disadvantages of using CPM are _____.
a. difficulty in resetting milestones and dependencies b. limited in calculating cost and schedule variances c. limited capabilities in tracking levels and metrics d. complexity and required commitment
Conductors that become too hot ________
A) Could be the result of a short to ground before the load B) Create excessive resistance C) Both A and B D) Neither A nor B