Domestic heating in America : a study of heating, cooking and hot water supply in small houses in U.S.A. and Canada. Report of a joint party from the Ministry of fuel and power and the Department of scientific and industrial research.

  • Great Britain. Joint Party to Investigate Domestic Heating in America.
Date:
1946
Catalogue details

Licence: Public Domain Mark

Credit: Domestic heating in America : a study of heating, cooking and hot water supply in small houses in U.S.A. and Canada. Report of a joint party from the Ministry of fuel and power and the Department of scientific and industrial research. Source: Wellcome Collection.

    62/166 (page 50)
    7.46. Typical dimensions for solid fuel forced warm air furnace for small house : About the same as for a gravity warm air furnace but may be slightly smaller. 7.47. Materials: Usually cast iron firebox with sheet metal casing and ducting. 7.48. Fuel: Chiefly coal; oil and gas also used. 7.49. Stoking : Usually hand-fired, but installation of mechanical stokers is increasing in larger houses and particularly where this enables cheaper coal to be used. 7.50. Grate : Usually shaking. 7.51. Control of burning : By either room or bonnet thermostat operating ashpit damper and chimney damper or spoil draught. [The bonnet is the space at the top of the furnace below the outlet manifold. ] 7.52. Specification requirements for Forced Warm Air Furnaces : (i) Solid Fuel : Minimum efficiency : 55 per cent. Flue gas temperature : not less than 830°F. above room temperature. Flue draught : not more than 0-06 in. water gauge. Attention interval: hand-fired, 8 hours or more; magazine feed, 12 hours or more. | Banking period: hand-fired, 12 hours or more; magazine feed, 24 hours or more. Test fuel : chestnut anthracite. Special requirements : Air temperature rise in bonnet at full output from 70°F. to 100°F. Firepot or other metal heat exchanger parts must not exceed temperature of 930°F. maximum above room temperature or 830°F. average above room temperature. Jacket temperature not to exceed 230°F. above room temperature except at parts above firing door or within 6 in. of sides of firing door frame and flue collar. Minimum rate of combustion ;: not more than 25 per cent. of that at maximum output. (11) Gas : Minimum efficiency : 75 per cent. i Flue gas temperature : not more than 480°F. above room temperature. Discharge air temperature : from 70° to 100°F.. above room temperature. Heating element temperature : not to exceed 875°F (it) Oul : Minimum efficiency : 72 per cent. Air temperature rise: go° + 10°F. In the oil and solid fuel tests the air velocity and temperature at the filter are limited.