Econar GeoSource DualTEK GV Series Installation And Operating Instructions Manual page 6

Table
2 -
Fan Performance Data
*Denotes
Factory
Setting
Table
3
- Airflow
IV. HYDRONIC
SIDE
HEAT
EXCHANGERS
A. Radiant Floor Heating
Hydronic
side heat exchangers can be
a
variety
of
different types.
Probably the
most popular form of
hydronic
heat exchangers is radiant
floor
heat
tubing.
Radiant floor heating gives excellent
comfort
and
very
high efficiencies
by
supplying
low
temperature water to
the
floor
slab, and
keeping
the heat concentrated evenly
near the
floor.
Radiant
floor
systems heat the occupants
and surfaces directly with radiant energy. Forced air
heating moves heated air around
the
building, which
transfers the heat
to
the
occupants.
Air
movement
can
create drafts, temperature stratification,
and air
rising
to
the
ceiling, which must
be considered when designing
heating systems. Always remember that hot air
rises, heat
does
not.
Radiant floor
heating usually
consists
of
1/2
inch plastic
tubing, approximately
one
linear foot of pipe
per square
foot of
floor
space. This value is doubled
for
one pass
along
the outside
walls
to concentrate more
heat
in
this
area. The tubing is generally
laid into
the concrete slab
floor
of
the
building.
New construction
techniques have
also made
installation into
wood
floors
and suspended
floors possible.
The amount
and spacing of
the
tubing is
sized
to
meet the capacity
of
the
space
at
a
certain
fluid
temperature inside
the
tubing.
To optimize
the
efficiency,
the
fluid
temperature inside the
tubing
should
be
maintained
as
low
as
comfortably possible.
The type
of floor
covering
and the spacing
of
the
pipe in
the
floor
have the greatest
effect on operating
fluid
temperature. Table 4 gives
a
rough estimate of expected
operating
temperatures
for
specific
floor
coverings:
Table
4
-
Floor
ECONAR
designs the
hydronic
side
of
the
GeoSource
DualTEK
line using a l
l5oF leaving water temperature
design
point.
This
leaving water temperature is
the
ideal
maximum fluid
temperature
for
radiant floor
systems.
Operating temperatures higher
than this
would
result in
an
uncomfortable hot feeling in
the conditioned space.
In
fact, boilers
connected to radiant
floor
heating
systems
must be restricted to a
115oF
maximum
operating
temperature
by mixing
valves or other control
devices.
Distributors of
radiant floor
heat exchanger tubing
can
help
size the
length of pipe
and
fluid
temperature required
for your specific radiant floor
heat
exchanger
applications.
Be sure to include insulation under
the slab
and around the
perimeter. Two
inches
of polystyrene
under
the slab and
two
to
four
inches
on
the
perimeter
down to
a
four-foot
depth are
requted.
This
insulation
reduces the heat loss to
the
ground
and increases the
response time of
the
heating system. Building insulation
is important in
radiant
floor
heating,
as
in
other methods
ofheating. Poorly
insulated buildings
can result in higher
floor
temperatures needed
to heat the
building, which
could
exceed the
level of
human comfort.
4
Low
Medium*
Hich
1005
1140
t2r0
96s
r 100
1
150
935
1065
1110
890
1010
1070
855
965
1030
815
935
985
805
915
960
740
840
895
Low
Medium
High*
1325
1505
r685
1275
1450
1625
1235
t4r5
1550
I
200
1375
1500
1
165
13n
t435
1
135
1275
1405
I 105
1245
1360
1055
I 185
1305
Low
Medium
High*
1500
1700
1900
1450
1645
1850
1,410
1595
1800
1360
1555
1740
1325
1500
1680
13
10
1480
1625
t250
1410
1590
1210
1380
15r0
Low
Medium*
Hich
1900
2220
24tO
1850
2185
2370
1800
2150
2325
1750
2110
2250
1690
2050
2200
I
660
2000
2150
1600
1960
2110
1560
1880
2030
485
1
100
t2t0
680
'521
I
1550
t705
790
1800 1920
845
'7L
I
1920
2000
115
100
85
70
GytGHt520t52t
GV/GMg0/591
GY/GH1670t671
a
;rrfie*-@i:=ia:
GV/GII/360/361
ffire
GV/Grr/590/591
noleum/Ilard Wood
)uarrv Tile
- Residential
)uarrv
Tile -
Commercial