Mitsubishi Electric PUMY-HP36NKMU1, Техническое и сервисное руководство

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14
OCH733
0 50 100 150 200 250 300 350 400 450 500 550 600
0.50
0.55
0.60
0.65
0.70
0.75
0.80
0.85
0.90
0.95
1.00
<Cooling>
Design Condition
Outdoor Design Dry Bulb Temperature 98.6ºF (37.0ºC)
Total Cooling Load 30.3 kBtu/h
Room1
Indoor Design Dry Bulb Temperature 80.6ºF (27.0ºC)
Indoor Design Wet Bulb Temperature 68.0ºF (20.0ºC)
Cooling Load 13.6 kBtu/h
Room2
Indoor Design Dry Bulb Temperature 75.2ºF (24.0ºC)
Indoor Design Wet Bulb Temperature 66.2ºF (19.0ºC)
Cooling Load 16.7 kBtu/h
<Other>
Indoor/Outdoor Equivalent Piping Length
250 ft
1. Cooling Calculation
(1) Temporary Selection of Indoor Units
Room1
PEFY-P15 15.0 kBtu/h (Rated)
Room2
PEFY-P18 18.0 kBtu/h (Rated)
(2) Total Indoor Units Capacity
P15+ P18 = P33
(3) Selection of Outdoor Unit
The P36 outdoor unit is selected as total indoor units capacity is P33
PUMY-P36NKMU3
36.0 kBtu/h
(4) Total Indoor Units Capacity Correction Calculation
Room1
Indoor Design Wet Bulb Temperature Correction (68.0ºF) 1.02 (Refer to Figure 1)
Figure 1 Indoor unit temperature correction
To be used to correct indoor unit only
Figure 2 Outdoor unit temperature correction
To be used to correct outdoor unit only
Figure 3
Correction of refrigerant piping length
Room2
Indoor Design Wet Bulb Temperature Correction (66.2ºF) 0.95 (Refer to Figure 1)
CT i = Σ (Indoor Unit Rating × Indoor Design Temperature Correction)
= 15.0 × 1.02 + 18.0 × 0.95
= 32.4 kBtu/h
(5) Outdoor Unit Correction Calculation
Outdoor Design Dry Bulb Temperature Correction (98.6ºF) 0.98 (Refer to Figure 2)
Piping Length Correction (250 ft) 0.93 (Refer to Figure 3)
Total Outdoor Unit Capacity (CTo)
*1 G(CTi) is used only when greater than 100% indoor model size are connected in total,
refer to STANDARD CAPACITY DIAGRAM.
Total Indoor Units Capacity (CTi)
CTo = Outdoor Rating × G(CTi)
*1
× Outdoor Design Temperature Correction
× Piping Length Correction
= 36.0 × 0.98 × 0.93
= 32.8 kBtu/h
(6) Determination of Maximum System Capacity
Comparison of Capacity between Total Indoor Units Capacity (CTi) and Total Outdoor Unit Capacity (CTo)
CTi = 32.4 < CTo = 32.8, thus, select CTi.
CTx = CTi = 32.4 kBtu/h
(7) Comparison with Essential Load
Against the essential load 30.3 kBtu/h, the maximum system capacity is 32.4 kBtu/h: Proper outdoor units have been selected.
(8) Calculation of Maximum Indoor Unit Capacity of Each Room
CTx = CTi, thus, calculate by the calculation below
Room1
Indoor Unit Rating × Indoor Design Temperature Correction
= 15.0 × 1.02
= 15.3 kBtu/h OK: fulfills the load 13.6 kBtu/h
Room2
Indoor Unit Rating × Indoor Design Temperature Correction
= 18.0 × 0.95
= 17.1 kBtu/h OK: fulfills the load 16.7 kBtu/h
Go on to the heating trial calculation since the selected units fulfill the cooling loads of Room 1, 2.
Indoor
Temperature
-15 -10 -5 0 5 10 15 20 25 30 35 40 45
5 14 23 32 41 50 59 68 77 86 95 104 113
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
Ratio of cooling capacity
Outdoor Temperature
[°C D.B.]
[°F D.B.]
19.4°C (67.0°F) W.B
15 16 17 18 19 20 21 22 23 24
59 60.8 62.6 64.4 66.2 68 69.8 71.6 73.4 75.2
0.4
0.6
0.8
1.0
1.2
Ratio of cooling capacity
Indoor Temperature
[°CW.B.]
[°FW.B.]
18 [kBtu/h]
27 [kBtu/h]
36 [kBtu/h]
Capacity ratio
Piping equivalent length (ft)
Total capacity of indoor unit
46.8 [kBtu/h]
(kBtu/h)
Model Number
for indoor unit Model 04 Model 05 Model 06 Model 08 Model 12 Model 15 Model 18 Model 24 Model 27 Model 30 Model 36 Model 48 Model 54 Model 72
Model
Capacity
4.0 5.0 6.0 8.0 12.0 15.0 18.0 24.0 27.0 30.0 36.0 48.0 54.0 72.0
Capacity of indoor unit