Patent ID: 7113888
Filing Date: 2006-09-26
Classification: F24S,F24T,F25B,Y02E

Abstract:
1. A performance prediction program for a ground source heat pump system having a plurality of buried tubes as heat exchangers and a computer functioning by the program, wherein the computer comprises: a dimensionless distance calculating means for calculating a dimensionless distance (r*) by non-dimensionalizing a radial distance (r) from one of said plurality of buried tubes using the following expression (1); where r r: radial distance from buried tube a first dimensionless time calculating means for non-dimensionalizing the following expression (2) using a dimensionless time t* equal to at/r a: thermal diffusivity of the ground q: heat flow on the surface of buried tube λ u: eigenvalue J Y a second dimensionless time calculating means for calculating a second dimensionless time (t a boundary time acquiring means for obtaining an elapsed time corresponding to said first dimensionless time as a first boundary time (t′) and an elapsed time corresponding to said second dimensionless time as a second boundary time (t″); an underground temperature change calculating means for acquiring said first boundary time and said second boundary time, and for calculating an underground temperature change at any point for a distance between said plurality of buried tubes r a tube surface temperature change calculating means for calculating an underground temperature change on a surface of said plurality of said buried tubes by a summation of said underground temperature changes for respective buried tubes.