Riello 20120391, Инструкции для установщика и технической поддержки

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157
ACCESSORIES
INSTALLATION
The water supply of each desuperheater is provided in parallel.
The hydraulic connection at water inlet and outlet of the des-
uperheater must not generate mechanical stresses on the ex-
changers; if necessary, install flexible connections.
Fit the balancing and control valves of the water flow rate on
the exchanger outlet.
The flow rate balancing and control can be performed by read-
ing the pressure drop of the exchangers.
The pressure drop on each one of them must be identical to
the total water flow rate indicated by the selection programme.
It is possible to precisely adjust the settings of the water flow
rate for each desuperheater when the unit works at full load
trying to obtain absolutely identical leaving water tempera-
tures for each circuit.
Refer to the tables below to adjust the balancing valves before
starting the system.
Application data:
Water exchanger inlet/outlet temperature: 12/7°C Outdoor air
temperature: 35°C
Water inlet/outlet difference on desuperheater: 10 K
Evaporator fluid: chilled water
Fouling level coefficient: 0.18 x 10-4 sq.m K/W
NXC
Models
Entering water temperatures
on desuperheater
45°C 50°C 55°C
Qhr
(kW)
q
(l/s)
∆
p
(kPa)
Qhr
(kW)
q
(l/s)
∆
p
(kPa)
Qhr
(kW)
q
(l/s)
∆
p
(kPa)
044 12.9 0.31 6.1 10.9 0.26 4.4 9.0 0.21 3.1
048 16.5 0.40 9.5 14.3 0.34 7.4 12.0 0.29 5.2
056 18.1 0.43 11.7 15.4 0.37 8.5 12.8 0.31 6.1
064 19.3 0.46 12.9 16.6 0.40 9.8 13.7 0.33 6.9
072 24.3 0.58 11.8 21.0 0.50 9.2 17.5 0.42 6.5
084 28.6 0.68 16.3 24.4 0.58 12.1 20.6 0.49 8.8
096 30.5 0.73 11.4 25.8 0.62 8.2 21.5 0.51 5.8
104 36.4 0.87 16.0 31.9 0.76 12.4 27.0 0.64 8.9
122 43.1 1.03 22.6 37.4 0.89 17.2 31.6 0.75 12.3
142
(1)
47.1 1.12 11.3 39.7 0.95 8.3 33.0 0.79 5.9
164 (1) 54.0 1.29 15.0 45.6 1.09 10.7 38.3 0.92 7.8
NXH - Cooling mode
Models
Entering water temperatures
on desuperheater
45°C 50°C 55°C
Qhr
(kW)
q
(l/s)
∆
p
(kPa)
Qhr
(kW)
q
(l/s)
∆
p
(kPa)
Qhr
(kW)
q
(l/s)
∆
p
(kPa)
044 10.9 0.26 4.4 9.1 0.22 3.1 7.1 0.18 2.1
048 14.4 0.34 7.5 12.2 0.29 5.4 10.0 0.24 3.7
056 17.2 0.41 10.5 14.7 0.35 7.8 12.3 0.29 5.6
064 17.4 0.44 6.6 15.1 0.36 4.6 12.3 0.29 3.0
072 21.4 0.51 9.3 17.9 0.43 6.7 14.7 0.35 4.8
080 26.8 0.64 14.7 22.5 0.54 10.4 18.8 0.45 7.5
084 23.9 0.57 12.1 21.2 0.51 7.8 16.3 0.39 5.8
096 28.1 0.67 9.9 23.9 0.57 7.1 19.7 0.47 5.1
104 33.9 0.81 14.0 28.3 0.68 10.1 23.7 0.57 7.2
122 37.7 0.90 17.5 31.7 0.76 12.4 26.5 0.63 8.9
142
(1)
42.9 1.03 9.4 35.5 0.85 6.7 29.1 0.70 4.5
164
(1)
52.3 1.25 14.1 44.2 1.06 10.1 36.9 0.88 7.1
NXH - Heating mode
Models
Entering water temperatures
on desuperheater
45°C 50°C 55°C
Qhr
(kW)
q
(l/s)
∆
p
(kPa)
Qhr
(kW)
q
(l/s)
∆
p
(kPa)
Qhr
(kW)
q
(l/s)
∆
p
(kPa)
044 10.1 0.24 3.8 8.3 0.20 2.7 6.8 0.16 1.8
048 11.1 0.27 4.6 9.3 0.22 3.3 7.7 0.18 2.3
056 14.0 0.33 7.1 11.8 0.28 5.2 9.9 0.24 3.6
064 14.3 0.34 4.4 11.8 0.28 3.0 9.4 0.22 2.0
072 17.1 0.41 6.3 14.4 0.34 4.5 11.9 0.28 3.1
080 19.1 0.46 7.8 16.0 0.38 5.6 13.2 0.32 3.9
084 17.5 0.42 6.6 14.6 0.35 4.8 11.7 0.28 3.2
096 21.4 0.51 6.0 17.7 0.42 4.1 14.7 0.35 2.8
104 20.6 0.49 5.1 16.5 0.39 3.4 12.7 0.30 2.0
122 23.0 0.55 6.9 18.5 0.44 4.7 14.5 0.35 3.0
142
(1)
32.0 0.77 5.5 26.7 0.64 3.8 21.6 0.52 2.6
164
(1)
37.5 0.90 7.3 31.2 0.75 5.4 25.4 0.61 3.7
Qhr Total heating capacity recovered by the
desuperheater(s).
q Total water flow rate on the desuperheater circuit.
∆
p Water pressure drop for desuperheater.
(1) This equipment is provided with two desuperheaters, one for
each circuit.
OPERATION LIMITS
NXC
Operating mode COOLING
Desuperheater minimum maximum
Entering water temperature
at start-up
25
(1)
60 °C
Leaving water temperature
during operation
30 65 °C
Air condenser minimum maximum
Outdoor operating temper-
ature
-10
(2)
46 °C
NXH
Operating mode COOLING
Desuperheater minimum maximum
Entering water temperature
at start-up
25
(1)
60 °C
Leaving water temperature
during operation
30 65 °C
Air condenser minimum maximum
Outdoor operating temper-
ature
-10
(2)
46 °C
Operating mode HEATING
Desuperheater minimum maximum
Entering water temperature
at start-up
25
(1)
60 °C
Leaving water temperature
during operation
30 65 °C
Air condenser minimum maximum
Outdoor operating temper-
ature
-10 48 °C
(1) Upon start-up the entering water temperature must not drop
below 25°C. A 3-way valve is required for systems with lower
temperature.
(2) With Winter Operation option.