User Manual

28
Air handling unit with cooling coil (cooling/de-humidication) and reheating coil, with PICVs
M
Plant data Cooling coil Heating coil
Cooling/heating power
100
75 kW 65 kW
Supply temperature producer θ
Producer
6 °C 55 °C
Temperatures Supply/Return θ
Supply
/ θ
Return
6/12 °C 50/35 °C
Temperature difference 6 K 20 K
Medium Water Water
Differential pressure Δp
MV
without balancing valve
57 kPa 12 kPa
Shutoff head pump H
0
(resp. Δp
V0
)
18 mWC
(180 kPa)
18 mWC
(180 kPa)
Positioning signal 0...10 V 0...10 V
Cooling coil Reheating coil
1 Determine Volumetric ow
100
Hydronic circuit
Δp
MV
Differential pressure
across variable ow path
Throttling circuit
Injection circuit with 2-port valve
Distribution setup Pressurized with variable volumetric ow (primary pump controlled)
decisive temperature difference
C
onstant 1.163:
with density
ρ = 1000 kg/m
3
, 3600 s/h and
specific heat capacity c = 4.187 kJ/kg · K
⩒
100
=
Q
100
1.163 · ∆T
75 kW
1.163 · 6 K
= 10.75 m
3
/h
θ
Return cooling coil
-
θ
Producer
= (12 – 6) °C =
6 K
⩒
100
=
θ
Producer
- θ
Return heating coil
= (55 – 35) °C = 20
K
65 kW
1.163 · 20 K
= 2.79 m
3
/h
⩒
100
=