Abstract: A closed loop geothermal heat exchange system for providing energy efficient cooling during the warmer seasons and baseline heating during the colder season that in one preferred embodiment is comprised of a heat exchanger unit, a circulating pump and a connection to a community water supply by means of upstream and down stream piping. The up stream supply pipe is connected to the community water supply on the system side of the water metering device. Water would flow from the supply side connection by means of water main system pressure to the input side of a heat exchanger through a turbulence-inducing fixture or fixtures that would increase the thermal transfer between the heat exchanger and the water. The output side of the exchanger is connected to the input side of a small booster pump, which supplies additional pressure to the return pipe which may also be configured into a venturi to assist the return water flow and is connected to community water system downstream from the supply connection.

Abstract: The apparatus is made up of a board having four parellel columns of equal numbers of holes extending therethrough. A plurality of mutually distinguishable flexible pegs may be received in the holes. The pegs have indicium on both ends. The indicia on a given end of all of the pegs form a series, the indicium on one end of a given peg not corresponding in position in its series with the position of the indicium of the other end of the peg in its series. The number of pegs is less than the number of holes by at least the number of columns. The series are further divided into 4 subseries of equal numbers of pegs.