Panasonic WU-144MF1U9E Technical and Service Data - Page 30

Capacity Correction Graph According to Tubing Length and Elevation Difference, Capacity change

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1. Model Selecting and Capacity Calculator Design of 3WAY VRF SYSTEM Rated performance values Item Cooling Heating Type Cooling capacity Power consumption Heating capacity Power consumption BTU/h(kW) kW BTU/h(kW) kW 72 72,000(21.1) 5.30 81,000(23.7) 5.79 96 96,000(28.1) 7.75 108,000(31.6) 8.6 1-10. Capacity Correction Graph According to Tubing Length and Elevation Difference Capacity change characteristics Base capacity 1 change rate 164 131 94 92 90 88 86 84 82 80 78 76 Elevation difference (ft) 98 96 66 98 *1 33 100 2 % 0 -33 -66 -98 3 -131 0 33 66 98 131 164 197 230 262 295 328 361 394 427 459 492 Equivalent length (ft) 4 Base capacity change rate 164 131 Elevation difference (ft) 98 5 66 33 0 -33 6 -66 *1 Sample calculations (System: 8 Ton, 164ft equivalent length, 49ft elevation difference The cooling capacity and heating capacity for this system are found as shown below.) ● Cooling operation From the graph, the base capacity change rate is found to be 92.0%. 96,000 BTU/h × 92.0% = 88,320 BTU/h (28.1kW × 92.0% = 25.8kW) Capacity change rate is 92.0%. Cooling capacity is 88,320 BTU/h (28.1 kW) -98 ● Heating operation -1310 33 66 98 131 164 197 230 262 295 328 361 394 427 459 492 From the graph, the base capacity change rate is found to be 97.2%. Equivalent length (ft) Because the calculation result exceeds 97.2%, the capacity 7 NOTE The positive side for the elevation difference indicates that change rate is 97.2%. 108,000 BTU/h × 97.2% = 105,000 BTU/h (31.6kW × 97.2% = 30.7kW) Heating capacity is the outdoor unit is installed at a higher position than the 105,000 BTU/h (30.7 kW) indoor units. The negative side indicates the opposite. 8 2 - 16

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Design of 3WAY VRF SYSTEM
2
- 16
2
1
1. Model Selecting and Capacity Calculator
<Cooling>
Elevation difference (ft)
Base capacity
change rate
92
90
88
86
84
82
80
78
76
94
96
98
100
%
0
33
66
98
131
164 197 230
262
295 328 361 394
427 459
492
0
33
66
98
131
164 197 230
262
295 328 361 394
427 459
492
164
131
98
66
33
0
–33
–66
–98
–131
Equivalent length (ft)
*1 Sample calculations
(System: 8 Ton, 164ft equivalent length, 49ft elevation
difference
The cooling capacity and heating capacity for this system are
found as shown below.)
●
Cooling operation
From the graph, the base capacity change rate is found to be
92.0%.
Capacity change rate is 92.0%.
(28.1kW
×
92.0% = 25.8kW)
92.0% = 88,320 BTU/h
Cooling capacity is
88,320 BTU/h (28.1 kW)
●
Heating operation
From the graph, the base capacity change rate is found to be
97.2%.
Because the calculation result exceeds 97.2%, the capacity
change rate is 97.2%.
(31.6kW
×
97.2% = 30.7kW)
Heating capacity is
105,000 BTU/h (30.7 kW)
Equivalent length (ft)
<Heating>
Base capacity
change rate
164
131
98
66
33
0
–33
–66
–98
–131
0
33
66 98
131 164 197 230 262 295 328 361 394 427 459 492
Elevation difference (ft)
96,000 BTU/h
×
97.2% = 105,000 BTU/h
108,000 BTU/h
×
1-10. Capacity Correction Graph According to Tubing Length and Elevation Difference
Capacity change characteristics
The positive side for the elevation difference indicates that
the outdoor unit is installed at a higher position than the
indoor units. The negative side indicates the opposite.
Rated performance values
Item
Cooling
Heating
Type
Cooling capacity
BTU/h(kW)
Power consumption
kW
Heating capacity
BTU/h(kW)
Power consumption
kW
72
72,000(21.1)
5.30
81,000(23.7)
5.79
96
96,000(28.1)
7.75
108,000(31.6)
8.6
NOTE