Toshiba HFC R-410A Example of equipment selection, Selection criteria for each floor, Outside view

Example of equipment selection

The following shows an example of equipment selection based upon a building model.

Fig. 1 - Overview of building model

Outside view Floor configuration

Small meeting room

Executive rooms

Office rooms (Entire floor)

Office rooms

Stores

Non-air conditioning zone

•Steel frame, reinforced concrete building, four floors above ground. Total floor area : 415 m²

Outdoor unit is installed on the roof.

•Indoor design conditions:

Cooling: 27.0/19.0°C db/wb. Heating: 20°C db

•Outdoor design conditions:

Cooling: 35°C db (standard condition). Heating: 3°C wb (standard condition: 6°C wb)

Selection criteria for each floor

1F: Outdoor unit capacity exactly matches the total indoor unit capacity.

Total indoor unit hp = Outdoor unit hp	Indoor: 2.5 hp x 2 units + 3.2 hp + 2 hp = 10.2 hp
	Outdoor: 10 hp Same capacity

2F: Outdoor unit capacity matches the potential total indoor unit capacity with the possibility of future extension.

Office rooms 2 and 3 are to be used as warehouses at first, so air conditioning is not necessary at present. However, there is a plan to convert them into offices, so an outdoor module with extra capacity is required. Piping/wiring are carried out. Indoor unit is not yet installed.

When the rooms are used as an office later, the indoor unit is installed.

3F: One indoor unit is connected to one outdoor unit.

The outdoor module should have sufficient capacity to cover the peak demand of the indoor unit connected.

4F: Consider the diversity factor and have the outdoor module match 135% of indoor unit capacity.

This is a typical matching of indoor/outdoor units for a Super MMS system.

•Total indoor unit hp > Outdoor unit hp

•Select each indoor unit based on individual peak room load.

Indoor: 2.5 hp + 2.5 hp + 2 hp + 2 hp (capacity difference in each room) + 1.3 hp =

10.3 hp (different capacity) Outdoor: 8 hp (different capacity)

•The cooling load profile needs to be taken into consideration.

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