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5
5
DVM design process
5-1. DVM design process
DVM is a multi-system air conditioner that changes its performance by different conditions such as design temperature,
indoor and outdoor unit combination rates, heating operation rates, piping length, and level difference. It is important to select
the appropriate design condition to the load specification of each room.
• Design temperature
• Calculate cooling and heating loads
• Power supply, piping length and level difference
• Consider design temperature conditions to select larger
indoor types than actual load.
No
Yes
Yes
No
Determine DVM design conditions
Select preliminary indoor unit
for each zone
Calculate actual capacity of each
indoor unit
Draw design diagram
Select DVM control system
Actual capacity of each indoor unit >=
cooling and heating load for each zone
Does actual combination rates of indoor
and outdoor units exceed 100%?
Does actual combination ratio of indoor
and outdoor units exceed 100%?
Calculate actual capacity of
outdoor units (Using the
relevant outdoor unit's
capacity table 100~130%)
Calculate actual capacity of
outdoor units (Using the
relevant outdoor unit's capacity
table 100%)
• Determine outdoor units by the sum of the capacity of
preliminary selected indoor units: At this time, decide how
much combination ratio to permit.
• If indoor units’ actual capacity is lower than the load, reselect
ones with a larger capacity. Depending on designers’ own
discretion.
• If there is no indoor unit with a larger capacity, add another
indoor unit.
• Calculate actual capacity of each indoor unit based
on the calculated outdoor capacity.
• Calculate actual capacity of outdoor
units considering design temperature,
indoor and outdoor unit combination
ratio, piping length, level difference,
heating operation rates, etc.
Select preliminary outdoor unit
(Max. combination ratio of indoor and
outdoor units: 130%)
Re-selection of
indoor units
1. products(01~41) 3/14/08 22:01 Page 32
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