2 - 329
R2 (HIGH
COP
)
8. CAPACITY TABLES
YKB/YLM 2nd
MEE15K022
Indoor Temperature [°CD.B.]
Ratio of heating capacity
15
16
17
18
19
20
21
22
23
27
26
25
24
0.6
0.7
0.8
0.9
1.0
1.1
1.1
0.9
0.8
0.7
0.6
0.5
1.0
1.2
Ratio of heating capacity
-20
-4
-15
5
-10
14
-5
23
0
32
5
41
10
50
15
59
°CW.B.
°FW.B.
Indoor Temperature
Outdoor Temperature
20°CD.B.
68°FD.B.
<H
eating>
Design Condition
Outdoor Design Wet Bulb Temperature
-3 ºC
Total Heating Load
20.5 kW
Room1
Indoor Design Dry Bulb T
emperature
21 ºC
Heating Load
9.5 kW
Room2
Indoor Design Dry Bulb T
emperature
23 ºC
Heating Load
11.0 kW
<Other>
Indoor/Outdoor Equivalent Piping Length
50 m
2. Hea
ting Calcula
tion
(1) Temporary Selection of Indoor Units
Room1
PEFY-P80
10 kW (Rated)
Room2
PEFY-P100
12.5 kW (Rated)
(2) Total Indoor Units Capacity
P80 + P100 = P180
(3) Selection of Outdoor Unit
The P200 outdoor unit is selected as total indoor units capacity is P180
PUHY-P200
25.0 kW
(4) Total Indoor Units Capacity Correction Calculation
Room1
Indoor Design Dry Bulb Temperature Correction (21ºC)
0.97 (Refer to Fig.4)
Tbl.1 Table of correction factor at frost and defrost
Room2
Indoor Design Dry Bulb Temperature Correction (23ºC)
0.90 (Refer to Fig.4)
CT
i
=
Σ
(
I
n
d
o
o
r
U
n
i
t
R
a
t
i
n
g
×
I
n
d
o
o
r
D
e
s
i
g
n
Temperature Correction)
= 10.0 × 0.97 + 12.5 × 0.90
= 21.0 kW
(5) Outdoor Unit Correction Calculation
Outdoor Design Wet Bulb Temperature Correction (-3ºC)
0.98 (Refer to Fig.5)
Piping Length Correction (50 m)
Defrost Correction
0.97 (Refer to Fig.6)
0.89 (Refer to Tbl.1)
Total Outdoor Unit Capacity (CTo)
T
otal Indoor Units Capacity (CTi)
CT
o = Outdoor Unit Rating × Outdoor Design Temperature Correction × Piping Length
Correction × Defrost
Correc
tion
= 25.0 × 0.98 × 0.97 × 0.89
= 21.1 kW
(6) Determination of Maximum System Capacity (CTx)
Comparison of Capacity between T
otal Indoor Units Capacity (CTi) and Total Outdoor Unit Capacity (CT
o)
CTi = 21.0 < CT
o = 21.1, thus, select CTi.
CTx = CTi = 21.0 kW
(7) Comparison with Essential Load
Against the essential load 20.5kW, the maximum system capacity is 21.0kW: 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
= 10.0 × 0.97
= 9.7 kW
OK: fulfills the load 9.5kW
Room2
Indoor Unit Rating × Indoor Design Temperature Correction
= 12.5 × 0.90
= 11.3 kW
OK: fulfills the load 11.0kW
Completed selecting units since the selected units fulfill the heating loads of Room 1, 2.
Outdoor inlet air temp. °C
6
4
2
1
0
-
2
-
4
-
6
-
8
-
1
0
-
2
0
Outdoor inlet air temp. °F
43
39
36
34
32
28
25
21
18
14
-4
PUHY-P200
1.00
0.95
0.84
0.825
0.83
0.87
0.90
0.95
0.95
0.95
0.95
PUHY-P250
1.00
0.95
0.84
0.825
0.83
0.87
0.90
0.95
0.95
0.95
0.95
PUHY-P300
1.00
0.93
0.82
0.80
0.82
0.86
0.90
0.90
0.95
0.95
0.95
PUHY-P350
1.00
0.93
0.85
0.83
0.84
0.86
0.90
0.90
0.95
0.95
0.95
PUHY-P400
1.00
0.93
0.85
0.83
0.84
0.86
0.90
0.90
0.95
0.95
0.95
Fig.4
Indoor unit temperature correction
To be used to correct indoor unit only
Fig.5
Outdoor unit temperature correction
T
o be used to correct outdoor unit only
Fig.6
Correction of refrigerant piping length
0.90
0
20
40
60
80
100
120
140
160
180
Heating capacity correction factor
0.95
1.00
Piping equivalent length (m)
