The number of five common loops at 30-tons (106 kW) each is not entirely arbitrary since many systems have been successful with both larger and smaller loops.
Substitute the use of large diameter central piping systems with multiple common loops, multiple one-pipe loops, unitary loops, or combinations of each type.
Three types of systems discussed in the ASHRAE GSHP text are the unitary system, the common loop system, and the one-pipe system.
The common loop GSHP costs and demand are shown in Table 1 as Option 1.
He is one of the designers of Common Loops
and the emerging Common Lisp Object Standard.
It was discovered that systems with the highest ENERGY STAR ratings in this survey (unitary, one-pipe, and common loops) are now non-compliant with the recent updates to the mechanical section of ASHRAE/IES Standard 90.1-2010 (Section 188.8.131.52).
* Systems with heat pumps circuited to individual ground loops, small central, or multiple common loop circuits out-performed systems with large central loop circuits by a significant margin.
One elementary school in the survey had a single common loop while the others had multiple common loops.
Five systems in the survey were served by common loops connected to multiple heat pumps inside the building.
Common Loop GSHP with Individual Pumps Energy Performance