49
Capacities and Selection Data
Piping dimensions:
●
Equivalent pipe length between outdoor unit and indoor units: 196.85 ft. (60 m).
● Pipe height: 82.02 ft. (25 m).
● Cooling capacity correction factor depending on the pipe length =0.90.
● Heating capacity correction factor depending on the pipe length =0.95.
● Heat recovery system (3 pipes)
Appropriate selection of indoor units and nominal capacity
Example: selection of AVD ducted indoor units.
The pre-selected capacity of the dierent indoor units has not been the immediately higher in all the units, in order to apply a
safety factor considering the dierent correction factors existing, which will reduce the capacity.
Concept Room 1 Room 2 Room 3 Room 4 Room 5 Room 6 Room 7
Model selected AVD-19* AVD-24* AVD-24* AVD-27* AVD-38* AVD-48* AVD-48*
Nominal cooling load (Btu/h) 19,100 24,200 24,200 27,400 38,000 48,000 48,000
Nominal heating load (Btu/h) 21,600 27,400 27,400 30,800 42,500 54,500 54,500
The resulting total indoor unit capacity is 228,900 Btu/h . The
outdoor unit with the exact capacity is the 228,900 Btu/h
model, but the possibility “Reduced total outdoor unit capacity”
allows the 184,000 Btu/h model selection. Thus, it is allowed at
the outdoor unit to be up to 24% smaller capacity when
compared with other air conditioning systems.
Then, it’ shown a diagram of the installation resulting:
184,000Btu/h
19,100
Btu/h
24,200
Btu/h
24,200
Btu/h
27,400
Btu/h
38,000
Btu/h
48,000
Btu/h
48,000
Btu/h
228,900 Btu/h
s
Total combination capacity = (Total indoor unit capacity / Outdoor unit capacity)
x 100% = = (228,900Btu/h / 184,000Btu/h) x100% ≈ 124%
NOTE
The maximum simultaneous load on the installation must not be higher than 184,000 Btu/h for this example. To determine the
outdoor unit pre-selected nominal cooling and heating capacity, it’s necessary refer to manual of Engineering Data, in which
the total capacity combination (124%) and the temperature condition have been taken into consideration.
Concept Room 1+2+3+4+5+6+7 (228,900 Btu/h) Outdoor unit pre-selected (184,000 Btu/h~124%)
Total nominal cooling load (Btu/h) 228,900 196,348
Total nominal heating load (Btu/h) 258,700 208,480
NOTE
● If the air inlet temperature for the indoor unit or outdoor unit is not contained in the capacity tables, an interpolation
should be carried out using the values above and below those of the air inlet temperature.
● If the total combination capacity is not shown in the capacity tables (for example, 124%), an interpolation should be
carried out using the values above and below (120% and 130%) those of the total combination
Next step will be the capacity correction using the dierent correction factors shown in this chapter.
To Next Page
Loading...
Need help?
General
