Convention Halls, Wedding Halls In Hotels - Mitsubishi Electric Lossnay series Technical Manual

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CHAPTER 6 Examples of Lossnay Applications

5. Convention Halls, Wedding Halls in Hotels

5.1 System Design Challenges
Hotels often included conference, wedding, and banquet halls.
Air conditioning systems in these spaces had to have a ventilation treatment system that could handle extremely large
fluctuations in loads, any generated tobacco smoke, and odor removal.
5.2 Systems Requirements
The presence of CO and CO
ventilation standards; often the limit was set at 18 CFM·person to 21 CFM·person (30 m
package air conditioners with ventilation or air-handling unit facilities were often used, but these were greatly affected by
differences in capacity, ratio of smokers, and length of occupancy in the area.
5.3 Details
The proposed plan had two examples using a Lossnay unit as a ventilator for total energy recovery in the air-conditioned
conference room, and using several package air-conditioners with ventilation for convention and banquet halls.
A) Conference room
Energy recovery ventilation was executed with continuous operation of the Lossnay unit, but when the number of persons
increased and the CO
separate centrifugal fan turned on automatically. The system could also be operated manually to rapidly remove smoke
and odors.
B) Convention and banquet halls
The system included several outdoor air introduction-type package air conditioners and straight centrifugal fans for
ventilation. However, an inverter controller was connected to the centrifugal fan so that it constantly operated at 50
percent, to handle fluctuations in ventilation loads. By interlocking with several package air-conditioners, detailed handling
of following up the air condition loads in addition to the ventilation volume was possible.
Systems using Lossnay were also possible.
Conference Room Ventilation System Diagram
5.4 System Trends
The load characteristics at hotels was complex compared to general buildings, and were greatly affected by the occupancy, and
operation. Because of the high ceilings in meeting rooms and banquet halls preheating and precooling also needs to be
considered. Further research on management and control systems and product development would be required to achieve
even more comfortable control within these spaces.
U-68
at permissible values, odor removal, and generated tobacco smoke were often considered in
2
concentration reached a set level (for example, 1,000 ppm in the Building Management Law), a
2
LS : Lossnay
EX : Centrifugal fan
PAC : Package air conditioner
3
/h·person to 35 m
Convention and Banquet Hall Ventilation System Diagram
3
/h·person). Several
EX : Centrifugal fan
PAC : Package air conditioner
IB : Inverter controller