. Power, heating and ventilation ... a treatise for designing and constructing engineers, architects and students. he different mixing by Air Rotation.—Cases sometimes occur where itis desirable to warm a given room at certain periods when ven-tilation is not required. This applies to rooms occupied for only aportion of the time, and to the quick warming of a room orbuilding in the morning. An arrangement for air rotation isshown in Fig. 79, in which the supply may be taken either from 116 HEATING AND VENTILATING PLANTS outside or from the room with which the heater connects, t
. Power, heating and ventilation ... a treatise for designing and constructing engineers, architects and students. he different mixing by Air Rotation.—Cases sometimes occur where itis desirable to warm a given room at certain periods when ven-tilation is not required. This applies to rooms occupied for only aportion of the time, and to the quick warming of a room orbuilding in the morning. An arrangement for air rotation isshown in Fig. 79, in which the supply may be taken either from 116 HEATING AND VENTILATING PLANTS outside or from the room with which the heater connects, thuspassing the same air through the stack over and over again. Sometimes, as in front halls and vestibules, it is desired to re-tain the appearance of indirect heating by using a register, whiledepending upon leakage for purposes of ventilation. In cases ofthis kind, the general arrangement shown in Fig. 79 may be usedwithout the outside air connection. Under these conditions thetwo registers are placed close together, as in Fig. 80, or, if de-sired, a single long register face may be employed, one end con-. Fig. 79. Register and Damper for Heating Only. necting with the cold-air downtake and the other with the warm-air uptake. Steatn-Pipe Connections. The two-pipe system, with dry or sealed returns, is used inindirect heating. The conditions to be met are practically thesame as in direct heating, the only difference being that the radia-tors are at the basement ceiling instead of on the floors method of making the supply and return connections doesnot differ essentially from those used in the direct system. A typical layout for connecting up an indirect heater is shownin Fig. 81. As the stacks are located in the basement, their height abovethe water line of the boiler is limited, and care should be takenthat the drop in pressure is not sufficient to cause the condensationto rise into them through the return piping. In estimating forthis condition it may be assumed
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