Unit selection base on cooling load
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2.3) Real function data
(1) Select the exact table according to outdoor unit model and combination rate using
outdoor unit capacity table. According to given indoor and outdoor temperature, find outdoor
unit capacity and power input using the table. Each indoor unit capacity (Power input) is
calculated as follows.
IUC=OUC × INX/TNX
IUC: Each indoor unit capacity
OUC: Outdoors unit capacity
INX: Each indoor unit capacity index
TNX: Total capacity index
(2) According to different pipe lengths and height difference, the indoor unit capacity will
change accordingly. If the changed capacity is smaller than load, replace it with a larger capacity
indoor unit and repeat the selecting progress.
2.4) Variation in capacity in accordance with the length of refrigerant piping.
(1) Cooling capacity modification
Effectual cooling capacity = Rated cooling capacity × Modification coefficient
= ([1] x [2] x [3] x [4])
[1] Modification coefficient of indoor W.B. temperature.
[2] Modification coefficient of outdoor D.B. temperature.
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