Unit selection base on cooling load
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2) Indoor unit selection
Select the suitable capacity for condition of ‘Indoor 20°C (WB), Outdoor 35°C (DB)’ using
indoor unit capacity table. The selected result is as follows. (Assuming the indoor unit type is
duct)
Location Room A Room B Room C Room D Room E Room F
Load (KW) 2.1 2.8 3.5 4.6 5.8 7.2
Unit size 22 28 36 45 56 71
Capacity (KW) 2.5 3.1 3.9 4.9 6.0 7.6
3) Outdoor unit selection
[1] Assume the indoor unit and outdoor unit combination as follows
Outdoor unit: YDS-280WC35A
Indoor unit: YDS -22UC15EA× 1, YDS -28UC15EA × 1, YDS -36UC15EA× 1,YDS -
45UC15EA × 1, YDS -56UC15EA × 1, YDS -71UC15EA × 1,
Indoor unit combination total capacity index
22 × 1 +28 × 1+ 36 × 1 +45 × 1+ 56 × 1 + 71 × 1 = 258, (258/ 280) × 100%= 92%
[2] Result: Because it is within 50～130%, it is a ”Right” selection.
[3] Real function data with indoor unit combination
a . For the 92% combination, calculate the cooling capacity of outdoor unit (YDS -
280WA35A).
26.41KW←90% (Indoor temperature: WB 20°C, Outdoor temperature: DB 35°C)
29.33KW←100% (Indoor temperature: WB 20°C, Outdoor temperature: DB 35°C)
Then calculated the outdoor capacity in 92% combination index:
Therefore: 26.41 + {(29.33 – 26.41)/ 10} ×2= 27.00;
b. Outdoor unit (YDS-280WC35A) cooling temperature: DB 35°C)
c. Capacity change factor with pipe length (50m) and height difference (30m): 0.905
d. Each cooling capacity
YDS -22UC15EA: 27.00 × 22/258 × 0.905 = 2.08(KW)
YDS -28UC15EA: 27.00 × 28/258 ×0.905 = 2.65 (KW)
YDS -36UC15EA: 27.00 × 36/258 ×0.905 = 3.41 (KW)
YDS -45UC15EA: 27.00 × 45/258 ×0.905 = 4.26 (KW)
YDS -56UC15EA: 27.00 × 56/258 ×0.905= 5.30 (KW)
YDS -71UC15EA: 27.00 × 71/258 ×0.905 = 6.70 (KW)
Location Room A Room B Room C Room D Room E Room F
Load (KW) 2.1 2.8 3.5 4.6 5.8 7.2
Unit size 22 28 36 45 56 71
Capacity (KW) 2.08 2.65 3.41 4.26 5.30 6.70
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