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CHAPTER 6
Examples of Lossnay Applications
2.2 Current topics
For general office buildings of the past, centralised air conditioning methods allowing the total centralised control and
systematization of the entire building (or divided into floor systems) were favoured due mainly to facility control, uniformity of
operation hours, maintenance efficiency and building usage. However, when additional work was required to be done on these
systems problems occurred.
A comparison of the following items in each system is shown in Table 1.
Energy conservation (air conditioning power)
Space saving (area required for air conditioning facilities)
Flexibility (zoning and refurbishing)
Air conditioning
Air conditioning
system
Heat
source
Air-cooling heat
pump chiller
+
Air handling unit
A
317
on each floor
+
Floor-type fan coil
unit (perimeter)
Air-cooling heat
pump chiller
+
Ceiling
embedded- type
B
317
fan coil unit
+
Ceiling embedded-
type outdoor air
treatment unit
Air-cooling heat
pump chiller
C
393
Single suction
method
Ceiling
embedded- type
air-cooling heat
pump
Package air
conditioner (City
239
D
Multi)
+
Ceiling embedded-
type outdoor air
treatment unit
B system +
D system
(combined use)
(B system for
E
285
general floors)
(D system for
special floors)
70
Table 1 Comparison of air conditioning systems
Required area (m
power (kW)
Machine
Load Total Shaft
room
105
422
80
513
45
362
80
–
67
460
50
567
47
286
80
–
53
338
80
–
Sleeve size
2
)
of beam ×
Q'ty
Roof Total
(Per floor)
Possible for
each
140
733
ø100 × 162
system
(each air
conditioner)
Possible for
each
outdoor air
ø100 × 162
140
220
treatment
ø250 × 108
unit
(Per unit
size)
Possible for
ø100 × 45
–
617
each air
conditioner
Possible for
each
outdoor air
150
230
ø250 × 189
treatment
unit
(Per unit
size)
Possible for
each
outdoor air
ø100 × 144
200
280
treatment
ø250 × 21
unit
(Per unit
size)
Cleanliness
Refur-
(Building
Zoning
bishing
Management
Law)
Possible by
assembling
Same
required
as left
specification
filter on air
conditioner
Possible by
assembling
required
specification
Same
filter on
as left
outdoor air
treatment unit
and fan coil
unit
Possible by
assembling
Same
required
as left
specification
filter on air
conditioner
Possible by
assembling
required
specification
Same
filter on air
as left
conditioner
and outdoor
air treatment
unit
Possible by
assembling
required
specification
Same
filter on
as left
outdoor air
treatment unit,
air conditioner
and fan coil
unit
Noise
Noise
control
possible
Little
noise
emitted
Relatively
loud
Little
noise
emitted,
but louder
than B
system
Little
noise
emitted
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