ApenGroup aermaxline PCH, Инструкция по установке и эксплуатации

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APEN GROUP SPA reserves the right to contribute the necessary modifications to the documentation or documentation
20
cod. HG0130.05GB ed.B-2104
PCH
21
cod. HG0130.05GB ed.B-2104
PCH
PCH cold storage generator module
PCH065 PCH020 PCH034 PCH045
PCH080
PCH105
0
1
2
3
4
5
6
7
0 5.000 10.000 15.000 20.000 25.000
Vel
oc
ità
[m
/s
]
Portata Aria a 15 ° C [m
3
/h]
A -Moduli singoli
V
PCH
Q
PCH
0
20
40
60
80
100
120
140
160
180
1500 3500 5500 7500 9500 11500 13500 15500 17500 19500
∆P
[Pa
]
Portata Aria a 15 ° C [m 3 /h]
A -Moduli singoli
PCH034 PCH045 PCH065 PCH020
PCH105
PCH080
Q
PCH
P
PCH
4.3. Bypass Calculation
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IMPORTANT: APEN GROUP can supply on request a programme able to automatically calculate the flow rate and the
size of the bypass required for the different types of installation
.
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The bypass flow rate calculation can be performed by following the instructions below. As an example, the calculation procedure
shown assumes that a PCH heater has been applied.
A. By using a default pressure drop (for example about 120 Pa) [P
PCH
] through the PCH section, find out the PCH flow rate [Q
PCH
]
going through the PCH by using the AIR FLOW RATES-PRESSURE DROPS diagram;
B. From the FLOW RATE-SPEED diagram, find out, by entering the current flow rate [Q
PCH
], the air flow through the PCH section
[V
PCH
];
C. Calculate the bypass air flow rate [Q
BYPASS
] by subtracting from the air handling or roof-top unit [Q
TOT
] the total air flow rate
going through the PCH [Q
PCH
]:
Q
BYPASS
[m
3
/h] = Q
TOT
- Q
PCH
D. Calculate the speed of the air going through the bypass section [V
BYPASS
] using the dynamic pressure formula, considering the
air density [ρ
AIR
] as a constant equal to 1.2 kg/m
3
:
V
BYPASS
[m/s] = (2*P
PCH
/ ρ
ARIA
)
1/2
E. Calculate the bypass section area [A
BYPASS
] by applying to the bypass section air flow rate the speed of the air going through
the bypass [V
BYPASS
]:
A
BYPASS
[m
2
] = Q
BYPASS
[m
3
/h] / V
BYPASS
[m/s] /3600 [s/h]