Water Furnace Versatec Compact Manual page 30

VERSATEC COMPACT SERIES SPECIFICATION CATALOG
Application Notes cont.
fuel boiler and cooling tower are not required to maintain the
loop temperature, operating and maintenance costs are very
low.
Ground-source systems are most applicable in residential and
light commercial buildings where both heating and cooling
are desired, and on larger envelope dominated structures
where core heat recovery will not meet overall heating loads.
Both vertical and horizontally installed closed-loops can be
used. The land space required for the "heat exchangers" is
100-250 sq. ft./ton on vertical (drilled) installations and 750-
1500 sq. ft./ton for horizontal (trenched) installations. Closed
loop heat exchangers can be located under parking areas or
even under the building itself.
On large multi-unit systems, sizing the closed loop heat
exchanger to meet only the net heating loads and assisting
cooling loads with a closed circuit cooling tower may be the
most cost effective choice.
Surface Water - Closed Loop/Ground Source
• Closed Loop/Ground-Source Surface Water Systems also
utilize the stable temperatures of Surface Water to maintain
proper water source temperatures for Versatec Compact
Series extended range heat pump systems. These systems
have all of the advantages of horizontal and vertical closed
loop systems. Due to the extended loop temperatures,
AHRI/ISO 13256-1 Ground Water or Ground Loop Heat
Pumps are required for this application.
In cooling dominated structures, the ground-source surface
water systems can be very cost effective especially where
local building codes require water retention ponds for short
term storage of surface run-off. Sizing requirements for the
surface water is a minimum of 500 sq. ft./ton of surface
area at a minimum depth of 8 feet. WaterFurnace should be
contacted when designs for heating dominated structures
are required.
Plate Heat Exchanger - Closed Loop/Ground Water
• Closed Loop/Ground Water Plate Heat Exchanger
Systems utilize lake, ocean, well water or other water
sources to maintain closed loop water temperatures in
multi-unit Versatec Compact systems. A plate frame heal
exchanger isolates the units from any contaminating effects
of the water source, and allows periodic cleaning of the heat
exchanger during off peak hours.
Operation and benefits are similar to those for ground-
source systems. Due to the extended loop temperatures,
AHRI/ISO 13256-1 Ground Loop Heat Pumps are required
for this application. Closed loop plate heat exchanger
systems are applicable in commercial, marine, or industrial
structures where the many benefits of a water source heat
pump system are desired, regardless of whether the load is
heating or cooling dominated.
30