Large Office Building - Mitsubishi Electric Lossnay series Technical Manual

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CHAPTER 6 Examples of Lossnay Applications
This chapter proposes Lossnay ventilation systems for eight types of applications. These systems were planned for use in
Japan, and actual systems will differ according to each country - the ventilation systems listed here should be used only as
reference.

1. Large Office Building

1.1 System Design Challenges
Conventional central systems in large buildings, run in floor and ducts, had generally been preferred to individual room units;
thus, air conditioning and ventilation after working hours only in certain rooms was not possible.
In this plan, an independent dispersed ventilation method applied to resolve this problem. The main advantage to such a
system was that it allows 24-hour operation.
A package-type indoor unit of air conditioner was installed in the ceiling, and ventilation was performed with a ceiling-embedded-
type Lossnay. Ventilation for the toilet, kitchenette and elevator halls, etc., was performed with a straight centrifugal fan.
System Design
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Building specifications : Basement floor SRC (Slab Reinforced Concrete), seven floors above ground floor
Total floor space 327,000 ft
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Basement : Employee cafeteria
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Ground floor : Lobby, conference room
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2nd to 7th floor : Offices, salons, board room
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Air conditioning system : Package air conditioning
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Ventilation : Ceiling embedded-type Lossnay, straight centrifugal fan
1.2 System Requirements
(1) Operation system that answers individual needs was required.
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Free independent operation system
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Simple control
(2) Effective use of floor space
(Eliminating the equipment room)
(3) Application to Building Management Laws
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Effective humidification
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Eliminating indoor dust
(4) Energy conservation
1.3 Details
(1) Air Conditioning
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In general offices, the duct method would applied with
several ceiling-embedded multiple cooling heat pump
packages in each zone to allow total zone operation.
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Board rooms, conference rooms, and salons would air
conditioned with a ceiling embedded-type or cassette-type
multiple cooling heat pump package.
U-60
2 (30,350 m 2 )
Installation of an office system air conditioning system
– The air supplied from the Lossnay unit was introduced into the
intake side of the indoor unit of air conditioner, and the stale air
from the room was directly removed from the inside of the ceiling.
Indoor unit of
air conditioner
Return grille
Inspection
space
SA (Supply air)
Indoor unit of
Lossnay
air conditioner
Suspension bolt
position
Supply grille
Suspension bolt
RA (Return air)
Lossnay
Grille
Inspection hole
SA (Supply air to room)
EA
(Exhaust
air)
OA
(Outdoor
air
suction)
EA
(Exhaust
air)
OA
(Outdoor
air
suction)