Hitachi EXV-2.0E2 - Page 20

REFRIGERANT PIPING AND CHARGE
PMML0293A rev.2 - 08/2016
12

Table of values for area boundaries
DX-Interface HP
Concept 2 HP 2.5 HP 3 HP 4 HP 5 HP 6 HP 8 HP 10 HP
A
HEX Volume [dm
3
] 0.57 0.89 1.03 1.51 1.92 1.92 2.92 3.89
Pipe length [m] 50 50 50 75 75 75 100 100
A’
HEX Volume [dm
3
] 0.57 0.89 1.03 1.51 1.92 1.92 2.92 3.89
Pipe length [m] 30 30 30 30 30 30 30 30
B
HEX Volume [dm
3
] 1.16 1.35 1.57 2.37 2.37 2.92 3.89 4.76
Pipe length [m] 50 50 50 75 75 75 100 100
B’
HEX Volume [dm
3
] 1.16 1.35 1.57 2.37 2.37 2.92 3.89 4.76
Pipe length [m] 30 30 30 30 30 30 30 30
C
HEX Volume [dm
3
] 1.4 1.59 2.23 3.03 3.03 3.58 4.55 6.06
Pipe length [m] 30 30 30 55 55 55 80 80
C’
HEX Volume [dm
3
] 1.4 1.59 2.23 3.03 3.03 3.58 4.55 6.06
Pipe length [m] 10 10 10 10 10 10 10 10
D
HEX Volume [dm
3
] 1.64 1.83 2.89 3.9 3.9 4.45 6.27 9.43
Pipe length [m] 10 10 10 30 30 30 30 30
E
HEX Volume [dm
3
] - - - 4.56 4.56 5.11 6.93 10.73
Pipe length [m] - - - 10 10 10 10 10
α - 0.03 0.03 0.04 0.06 0.06 0.06 0.06 0.12
β - 1.26
L_0 [m] -
30m if HEX Volume ≤ V
B’
Interpolation with points V
B’
& V
C’
if V
B’
< HEX Volume < V
C’
10m if HEX Volume ≥ V
C’
V_0 [dm
3
] - 1.16 1.35 1.57 2.37 2.37 2.92 3.89 4.76
7.5 CYCLE DESIGN EVAPORATING AND CONDENSING TEMPERATURES
Please make sure that the Heat Exchanger element to be connected to the DX-Interface series 2 satises the following installation
and design requirements. Failure to satisfy any of the items below may cause unappropriated system response, malfunction of any
of the system components, and/or damage to the components..
- The design pressure of the system is 4.15 MPa. The compression strength of the pipes must exceed 12.45 MPa (3 times the
design pressure)
- The inner volume of the heat exchanger piping must be within the limits specied in the technical documentation of each
DX-Interface series 2. Please make sure the design of the heat exchanger as well as the refrigerant charge follow such
limitations.
- The capacity of the heat exchanger must meet the specied nominal capacity of each DX-Interface series 2 under the
following temperature conditions. Failure to ensure heat exchanger capacity may lead to system malfunction.
Design temperatures Heating Design temperatures Cooling
Air temperature:
DX-interface HEX (T
in
): 20ºC(DB)
Outdoor: 7ºC(DB)/6ºC(WB)
Air temperature:
DX-Interface HEX (T
in
):
27ºC(DB)/19ºC(WB)
Outdoor: 35ºC(DB)
Condensing Temperature: 40ºC ~ 45ºC Evaporation Temperature: 6ºC
Subcooling Temperature: 3ºC Superheating Temperature: 5ºC