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Volume 8, Number 4


The complex

monitoring system

lines come together

in a junction area for

the home’s slab loop


hance the students’ learning experience

from theory to application. Each sys-

tem is 10-ton capacity and uses 200psi

SDR11 with 4710 piping to circulate

30-percent propylene glycol.

The closed loop system required five

8-foot deep trenches with a 6-pipe hori-

zontal system. Each trench was 100-

feet long with a total of 600 feet of heat

exchanger pipe per trench. The slinky

system also required 8-foot deep trench-

es. Ten trenches, 50-feet long with 600

feet of pipe per trench make up the sys-

tem. The system has 10 sets of 36-inch

diameter coils with a 12-inch pitch.

The 10-ton open loop system re-

quired a vertical well pump and hori-

zontal header pipe to connect the ac-

tive student lab water-to-water heat

pumps. After leaving the heat pump,

the ground-source water discharges to a

pond located in the green space behind

the HRA building.

Each system has connections for four

HydroHeat heat pump units. Each heat

pump connection includes temperature

sensing points and manually adjustable

ground-source flow valve and flow me-

ters. Students can connect various heat

pumps and adjust flows to observe the

impact on capacities and efficiencies.

To circulate the glycol water mixture

through the loops, the closed loop and

slinky systems both use Bell & Gossett

variable-flow pumps equipped with

variable-speed drives.

Currently the college is connect-

ing six different HydroHeat units that

include the following models and

sizes: 03-026-WTARW-HM (2-1/4

ton), 03-037-WTARW-HN-L-C (3

ton), 03-042-WTARW-MT (3-1/2

ton), 03-047-WTAR-HE-L-C (4 ton),

03-047-WTARW-HE-L-C (4 ton), and

03-056-WTAR-TS-MT-L-C (5 ton).

The total current connected capacity

is 21-3/4 tons. The school will have

the capability of adding six more units

and plans to do so in the near future,

according to Kerbelis.

The entire system is monitored from

a digital building control system by

Schneider Electric, which is displayed

on an interactive screen in the class-

room. Students can observe and trend

live data as a tool for understanding sys-

tem operations. Data will also be avail-

able live on the Internet.

Marcus DeJong, also an IGSHPA

member from Geothermal Loop Pros

LLC, Jenison, Michigan, was the in-

staller. Although the company is