223222 METHOD OF CAPACITY CALCULATION
The capacity calculation method which takes the effects of air temperature, pipe length and
frosting/defrosting into consideration is shown below.
22 Calculate the estimated capacity of each indoor unit2
(1) Find capacity of indoor unit at rated condition (TCin)r and at design temperature (TCin)d
[from 2-7 CAPACITY TABLE COOLING (INDOOR UNIT) or 2-8 CAPACITY TABLE HEATING (INDOOR UNIT)]
(2) Find the following compensation coefficient
Compensation coefficient of pipe length
●
Compensation coefficient of frosting/defrosting
●
(3) Calculate the estimated capacity of indoor unit (TCin)e2
COOLING:
Estimated capacity of indoor unit (TCin)e
= Capacity of indoor unit at design temperature (TCin)d
x Compensation coefficient of pipe length
HEATING:
Estimated capacity of indoor unit (TCin)e
= Capacity of indoor unit at design temperature (TCin)d
x Compensation coefficient of pipe length
x Compensation coefficient of frosting/defrosting
22 Calculate the compensated capacity of outdoor units2
(4) Find capacity of outdoor unit at rated condition (TCout)r
(5) Calculate total rated capacity of indoor units
and ratio to the rated capacity of outdoor units : ∑(TCin)r / (TCout)r .
(6) Find capacity of outdoor units at design temperature (TCout)d
[using result of (5) and 2-4 CAPACITY TABLE (OUTDOOR UNIT)].
(7) Calculate the compensated capacity of outdoor units (TCout)c.
COOLING:
Compensated capacity of outdoor units (TCout)c
= Capacity of outdoor unit at design temperature (TCout)d
x Compensation coefficient of pipe length
HEATING:
Compensated capacity of outdoor units (TCout)c
= Capacity of outdoor unit at design temperature (TCout)d
x Compensation coefficient of pipe length
x Compensation coefficient of frosting/defrosting
32 Decide system capacity2
(8) Calculate total capacity of indoor units at design temperature ∑(TCin)d2
(9) System capacity = the smaller one of (TCout)c and ∑(TCin)d. • • • • • • • • (7) or (8)
42 Calculate actual capacity of each indoor unit2
(10) Calculate actual capacity of each indoor unit by dividing system capacity proportionally.
Actual capacity of indoor unit
[From 2-6 CAPACITY COMPENSATION COEFFICIENT].
(Heating calculation only
: ∑(TCin)r
= (System capacity) x (Rated capacity of indoor unit) / (Total rated
capacity of indoor unit )
= (System capacity) x (TCin)r / ∑(TCin)r • • • • • (9) x (2) / (5)
- (02 - 08) -
)
[From 2-2 MODEL LINE UP].