7.1.1
Calculation of total minimum water content and flow rates
The machine needs a minimum water content according to the following values:
FLEX II
Cold water heat production
Hot water heat production
V
K
Q min
Q max
V
K
Q min
Q max
[m3]
[m3/h]
[m3/h]
[m3]
[m3/h]
[m3/h]
150
-
202,5
5,3
14,1
200,4
6,0
16,1
0,48
155
-
199,1
5,8
15,6
197,0
6,7
17,9
0,54
157
-
196,4
6,1
16,4
194,2
7,0
18,8
0,56
160
-
195,6
6,5
17,3
193,3
7,5
20,0
0,60
165
-
84,8
7,0
18,7
84,2
7,9
21,1
0,63
170
-
84,1
7,3
19,6
83,5
8,3
22,2
0,67
180
-
81,9
8,2
21,8
81,3
9,2
24,5
0,74
190
-
80,2
9,3
24,8
79,5
10,5
28,0
0,84
1100
-
43,0
10,6
28,2
42,7
11,7
31,3
0,94
1110
-
42,5
11,5
30,6
42,2
12,7
33,9
1,02
1115
-
41,8
12,3
32,8
41,5
14,1
37,6
1,13
LEGEND:
V
:
minimum water content of the plant
Q min
: minimum water flow to the heat exchanger
Q max
: maximum water flow to the heat exchanger
∆
T
max chiller =
8 °C
∆
T
max heat pump =
8 °C
dpw = K·Q² / 1000 Q
= 0,86 P/
∆
T
IMPORTANT: If pumps driven by inverters (either unit onboard pump or external pump) in every working condition the variation of
the water flow rate must be as low as possible. Variation must be less than 10% of the nominal flow rate per minute
7.2
WATER CIRCUIT REGULATION EQUIPMENT
Centrifugal motor pump block
Assures the discharge and the prevalence necessary to supply tube nest evaporator, the tank and the utility.
Automatic filling unit
Assures the water pressure in the plant is maintained at least 1.5 bar, automatically resetting it when necessary.
Safety valve
Takes care of opening the plant in atmosphere if the pressure exceeds the value of 6 bar.
Expansion tank
Takes care of compensating small water hammering and variations of volume for different temperatures.
Check valves
Take care of intercepting the pump for possible maintenance.
