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Small-scale Urban Building - Mitsubishi Electric Lossnay series Technical Manual

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Examples of Lossnay Applications

2. Small-Scale Urban Building

2.1 System Design Challenges
The system was designed effectively using limited available air conditioner and ventilator installation space.
For this application, air flow must be considered for the entire floor and the ventilator was installed in the ceiling plenum.
System Design
: Office
Building specification : RC (Reinforced Concrete)
Total floor space
: 5,950 ft
Application per floor : B1: Parking area
GF to 6F: Office
Air conditioning system : Package air conditioner
: Ceiling-embedded-type and cassette-type Lossnay, straight centrifugal fan, duct ventilation fan.
2.2 System Requirements
(1) Three sides of the building were surrounded by other
buildings, and windows could not be installed; therefore
mechanical ventilation needed to be reliable.
(2) Ample fresh outdoor air could not be supplied.
(3) If the exhaust in the room was large, odors from other areas
could have affected air quality.
(4) Humidification during winter was not possible.
2.3 Details
(1) Air conditioning
Space efficiency and comfort during cooling/heating was improved with ceiling-embedded cassette-type package air
(2) Ventilation
Conference room
Board room
Toilet, powder room
Location of air intake/exhaust air outlets on outside wall
The freshness of the outdoor air taken in by the Lossnay was important, and because the building was surrounded by
other buildings, the intake and exhaust ports must be placed as far apart as possible.
(552 m
) (B1 to 6F)
Entire area was ventilated by installing several ceiling-embedded-type Lossnay units.
Humidification was possible by adding a humidifier.
(Outdoor air was supplied to the toilet and kitchenette by setting the selection switch on the
Lossnay unit for supply to the extra-high.)
Area was independently ventilated by installing a ceiling-embedded-type or cassette-type
Lossnay in each room.
Area was exhausted with a straight centrifugal fan or duct ventilation fan.
(An adequate exhaust volume was obtained by introducing outdoor air into the space with the
toilet being ventilated constantly.)
GF Layout
2F to 6F Layout
PAC : Package air conditioner
LS : Lossnay


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