Design notes on panel conditioning room: Building M-59

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DIVISION OF BUILDING RESEARCH

NATIONAL RESEARCH COUNCIL OF CANADA

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NOTlE

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NOT FOR PUBLICATION

PREPARED BY G.T. Tamura CHECKED BY A.G. Wilson

FOR INTERNAL USE

APPROVED ByN .B.Hutcheon

ｾ

7

January

1960

PREPARED FOR _{Divisional Use}

SUBJECT _{DESIGN NOTES ON PANEL CONDITIONING ROOM - BUILDING M}

₅₂

This Note provides the basis for the detailed design of a conditioning system required for the Panel Conditioning Room of the Fire BUilding, M

59,

of the Division. The conditioning room located in the west end of the furnace room (room 124) of the Fire Research Building M

59

is intended for drying concrete wall and floor specimens. The conditioning room is to consist of two compartments adjacent and ｾｰ･ｮ to each other with the larger compartment being able to take four concrete walls positioned

vertically side by side, and the smaller compartment located above the mezzanine floor being able to take four concrete floors laid horizontally, one above the other. Concrete floor and wall speci-mens are to be dried by circulating air inside the compartments, and heating of recirculated air and laboratory air to obtain the required relative humidity of the air inside the compartments. The layout of the air conditioning systems proposed is shown in Fig. 1.

DESIGN DATA

The capacity of the air conditioning system for removal of moisture was based on the most severe ｳｵｲｲｾ･ｲ condition of 80°F

dew point temperature. By heating the air in the compartments to 110°F, the relative humidity of the air is

40%

at this dew point

temperature. Allowing the relative humidity to rise to

50%

gives

.006 lb. moisture removal per lb. of dry air. Introducing 500 cfro laboratory air into the compartments gives 300 lb. moisture

removal per day which is 1% of the weight of one large specimen. For other conditions the relative humidity and temperature of the conditioning room air can be controlled to give the required rate

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,

2

-of moisture- removal. Steam heater coil is sized to supply 64,000

Btu/hr. to maintain conditioning room temperature of 110oF. based on the heat required to raise 500 afm of laboratory air at 70°F and

500 cfro of recirculated ｡Ｑｾ at 110°F to 170°F. This heating rate ｾｾ also that required to provide the estimated heat requirements

'or the enclosure for 70°F outside.

AIR CIRCULATION FOR CONCRETE WALLS

Air recirculation in the larger compartment is obtained with the use of three propeller fans with a capacity of 1000 crm each. The fans are placed on the floor on the west end of the

compartment to blow air diagonally upward between the masonry walls. Electrical outlets should be provided for five fans. DBR will

provide fans.

AIR CIRCULATION FOR CONCRETE FLOORS

ｾ･ air in the compartment holding the floor specimen is recirculated by a centrifugal fan located outside the compartment and below the mezzanine floor. The air drawn from the larger compartment is directed upward -through two vertical ducts with a total of ten rectangular supply openings located and sized such that air is discharged at 4000 fpm between the concrete floors. The layout for this system 1s shown in Fig. 2.

RELATIVE HUMIDITY SYSTEM

The relative humidity system as shown in Fig. 3 consists of centrifugal fan, ductwork, steam heater COil, dampers and

controls to the heater coil and the dampers. The required temperature in the conditioning room is maintained by means of a modulating steam valve on the.heater coil actuated by the temperature sensing element, located at the compartment air inlet side of the R.H. system. The required relative humidity of the conditioning room is obtained by positioning interlinked dampers on the two inlet ducts by a modulated damper motor actuated by a relative humidity sensing element, also located a t the compartment air inlet side of the RoH. system.

When the compartments are at less than the required relative humidity, the damper across the laboratory air inlet duct is to be closed and the damper across the recirculation air inlet duct opened. When the relative humidity in the compartments exceeds the u per limit, the damper in the laboratory air inlet duct is to be opened and the damper in the recirculation air inlet duct partially closed so that

500 cfm laboratory air and 500 cfm recirculated air are heated and ejected into the compartments. The additional 500 cfro of laboratory air blown into the compartments displaces air in the compartment which is expelled through cracks in the enclosure.

A hand damper is located on the inlet recirculati.on D.i:e

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