-
-
'15 • HM-T-246
If the hot water outlet temperature is changed, the number of cylinders as the recirculation load also changes.
For the calculation at 0
℃
Hot water outlet temperature
℃
0
0
0
Recirculation temperature setting
℃
0
0
0
0
0
0
Recirculation return temperature
℃
Feed pipe length
m
0
0
0
0
0
0
Return pipe length
m
0
0
0
0
0
0
Ambient temperature
℃
0
0
0
0
0
0
Heat loss from recirculation circuit W
L/min
.
.
.
.
.
.
Operation time
H
Heat required for recirculation
kJ
+
0
+
0
+
0
+
0
+
0
+
0
Hot water volume required for recirculation kg
≒
L
0.
0.
.
0.
.0
.
Qty
.
.
.
.
.
.
Qty
.
.
.
.
.
.
loss and the recirculation load decrease.
Hot water outlet temperature
℃
0
0
0
Recirculation temperature setting
℃
0
0
0
0
0
0
Recirculation return temperature
℃
Feed pipe length
m
0
0
0
0
0
0
Return pipe length
m
0
0
0
0
0
0
Ambient temperature
℃
0
0
0
0
0
0
Heat loss from recirculation circuit W
L/min
.
.
.
.
.
.
Operation time
H
Heat required for recirculation
kJ
+
0
+
0
+
0
+
0
+
0
+
0
Hot water volume required for recirculation kg
≒
L
0.
0.
.
0.
0.
0.
Qty
0.
0.
.
.
.
.
Qty
.
.
.
.
.
.
Check of seasonal effect and setting of seasonal recirculation return hot water outlet temperature
and it is
used, unchanged, in summer (ambient temperature at 0
℃
):
Heat loss amount
=
0.
×
0
×
(0 – 0)
+
0.
×
0
×
( – 0)
=
(W)
=
0 – ), it
becomes deg/,0
×
=
deg so that temperature difference in summer and winter becomes deg. Therefore, provided the
recirculation return hot water temperature is
℃
in winter while it is
℃
in summer, it can be used regardless of seasons. Since
the calculation of heat loss amount is a guide, there will be no problem even if it is calculated with the recirculation temperature
at 0
℃
and the recirculation return hot water temperature at
℃
, as they are. Determine the recirculation return hot water
temperature by calculating the temperature difference in summer and winter as above and taking the season for test run into account.
AMP Air Conditioning
www.ampair.co.uk | [email protected]
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