The Nation's Schools, Količina 63Michael Vincent O'Shea McGraw Hill, 1959 |
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Zadetki 1–3 od 66
Stran 101
... heat the air , but only the solid objects it strikes . Floors , walls , desks , chairs , and the pupils themselves , -any objects that intercept the radiant energy waves , are warmed . The floor was warm enough for pupils to sit on ...
... heat the air , but only the solid objects it strikes . Floors , walls , desks , chairs , and the pupils themselves , -any objects that intercept the radiant energy waves , are warmed . The floor was warm enough for pupils to sit on ...
Stran 88
... heat a classroom on spring or fall days . Engineers planning heating and ventilating systems use the term Btu ( British thermal unit ) in their heat meas- urements and calculations . By definition , 1 Btu is the amount of heat required ...
... heat a classroom on spring or fall days . Engineers planning heating and ventilating systems use the term Btu ( British thermal unit ) in their heat meas- urements and calculations . By definition , 1 Btu is the amount of heat required ...
Stran 176
... heating systems fall into two categories : resistance heating and the " heat pump . " In resistance heat- ing , electric power is fed directly to each room and is employed there in radiators , convectors , baseboard con- vectors , or ...
... heating systems fall into two categories : resistance heating and the " heat pump . " In resistance heat- ing , electric power is fed directly to each room and is employed there in radiators , convectors , baseboard con- vectors , or ...
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