FLOOR/CEILING MINISPLIT FOR CLASSROOM APPLICATION

[schola]

Dear friends:

I am designing a classroom HVAC System where the client previews install floor/ceilng minisplit systems instead a ducted split unit.

The room is 8.00 TR Thermal Load and will have twenty PC.

I am not sure that use minisplit systems is advisable, because of their lack for:

1.- sending the cfm required (423 cfm/TR)
2.- admitting fresh air as fan-coil or AHU can do it.

What has been your experience using this kind of system for classroom applications?

Thaks,

schola

 

[imok2]

In addition to your concerns there's the matter of noise.
ANSI/ASA Standard S12.60-2002 sets an aggressive goal for noise levels in classrooms.
To meet the standard, school designers will need to look at all sources of noise in a classroom . external sound sources from traffic or flight patterns, noise from adjacent spaces, and sound sources within the room.

In-room HVAC systems can consist of unducted unit ventilators, fan coils, PTACs
packaged terminal air conditioners, and minisplit ductless air conditioning units. Avoiding
these systems is the best option, acoustically, since it may not be possible to meet S12.60 with
in-room systems.

Near-room HVAC systems can be an effective S12.60 solution. Near-room systems can include
ducted unit ventilators, fan coils, water-source heat pumps, and single-zone rooftop units.
Typically, four ceiling diffusers . spaced out evenly are needed to meet the 35 dBA. A weighted decibel value standard for the average classroom.

 

[friartuck]

Suggested manufacturers are:

Daikin, Mitsubishi and Toshiba.

I would imagine the noise level in a class full of 20 PC's is pretty noisy anyway.

I think Carrier have just linked up with one of the above?? so you chappies in the USA can get them via your Carrier agent.



Friar Tuck of Sherwood

 

[walkes]

I have used a mini-split system as supplementary cooling for the computer classrooms. The base HVAC system provides the necessary ventilation. The split unit deals primarily with the sensible load in the space (there is also some latent cooling).

Carrier and Mitsubishi do have a ceiling module that can have ventilation air ducted directly to it.