MEES19K180
PURY-H
P-
T(
S)NU-
A, Y(S)
NU-A
37
8. CAPACITY TABLES
Hyper Heating Inverter R2-Series
77
0.8
Indoor Temperature [°FD.B.]
Ratio of heating capacity
<Heating>
Design Condition
Outdoor Design Wet Bulb Temperature
37 ºF
Total Heating Load
62,000 BTU/h
Room1
Indoor Design Dry Bulb Temperature
77 ºF
Heating Load
31,000 BTU/h
Room2
Indoor Design Dry Bulb Temperature
77 ºF
Heating Load
31,000 BTU/h
<Other>
Indoor/Outdoor Equivalent Piping Length
100 ft.
2. Heating Calculation
(1) Temporary Selection of Indoor Units
Room1
PEFY-P36
40,000 BTU/h (Rated)
Room2
PEFY-P36
40,000 BTU/h (Rated)
(2) Total Indoor Units Capacity
P36 + P36 = P72
(3) Selection of Outdoor Unit
The P72 outdoor unit is selected as total indoor units capacity is P72
PUHY-P72
80,000 BTU/h
(4) Total Indoor Units Capacity Correction Calculation
Room1
Indoor Design Dry Bulb Temperature Correction (77ºF)
0.80 (Refer to Fig.4)
Room2
Indoor Design Dry Bulb Temperature Correction (77ºF)
0.80 (Refer to Fig.4)
CTi = Σ (Indoor Unit Rating × Indoor Design Temperature Correction)
= 40,000 × 0.80 + 40,000 × 0.80
= 64,000 BTU/h
(5) Outdoor Unit Correction Calculation
Outdoor Design Wet Bulb Temperature Correction (37ºF)
0.99 (Refer to Fig.5)
Piping Length Correction (100 ft.)
Defrost Correction
0.98 (Refer to Fig.6)
0.87 (Refer to Tbl.1)
Total Outdoor Unit Capacity (CTo)
Total Indoor Units Capacity (CTi)
CTo = Outdoor Unit Rating × Outdoor Design Temperature Correction × Piping Length
Correction × Defrost Correction
= 80,000 × 0.99 × 0.98 × 0.87
= 67,000 BTU/h
(6) Determination of Maximum System Capacity (CTx)
Comparison of Capacity between Total Indoor Units Capacity (CTi) and Total Outdoor Unit Capacity (CTo)
CTi = 64,000 < CTo = 67,000, thus, select CTi.
CTx = CTi = 64,000 BTU/h
(7) Comparison with Essential Load
Against the essential load 62,000BTU/h, the maximum system capacity is 64,000BTU/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
= 40,000 × 0.80
= 32,000 BTU/h
OK: fulfills the load 31,000BTU/h
Room2
Indoor Unit Rating × Indoor Design Temperature Correction
= 40,000 × 0.80
= 32,000 BTU/h
OK: fulfills the load 31,000BTU/h
Tbl.1 Table of correction factor at frost and defrost
Outdoor inlet air temp. °CWB
6
4
2
1
0
-2
-4
-6
-8
-10
-20
Outdoor inlet air temp. °FWB
43
39
36
34
32
28
25
21
18
14
-4
PUHY-P72
PUHY-P96
PUHY-P120
PUHY-P168
1.00 0.95 0.84 0.83 0.83 0.87 0.90 0.95 0.95 0.95 0.95
1.00 0.95 0.84 0.83 0.83 0.87 0.90 0.95 0.95 0.95 0.95
1.00 0.93 0.82 0.80 0.82 0.86 0.90 0.90 0.95 0.95 0.95
1.00 0.93 0.82 0.80 0.82 0.86 0.90 0.90 0.95 0.95 0.95
PUHY-P144
1.00 0.93 0.82 0.80 0.82 0.86 0.90 0.90 0.95 0.95 0.95
Completed selecting units since the selected units fulfill the heating loads of Room 1, 2.
Fig.4
Indoor unit temperature correction
To be used to correct indoor unit only
Fig.5
Outdoor unit temperature correction
To be used to correct outdoor unit only
Fig.6
Correction of refrigerant piping length
0.99
Ratio of heating capacity
37
Outdoor Temperature [°FW.B.]
100
Heating capacity correction factor
0.98
Piping equivalent length (ft.)
0000005744.BOOK 37 ページ ２０２０年２月２５日 火曜日 午後５時１９分
