§ 55. Mr. Pitmanasked the Lord President of the Council if he will give, from the facts obtained by the Building Research Centre, Department of Scientific and Industrial Research, the percentage efficiency of utilisation of coal burnt in modern appliances for open fires by radiant and convection heat in the room and in the whole house assuming that the flue is wholly within the house; and the similar figures for pre-war types of appliance.
§ Mr. H. MorrisonThe percentage efficiency of the modern open fire providing heat by convection as well as by radiation into the room in which it is situated is usually within the range 30 to 35 per cent. when burning coal. When the heat gained from the flue is taken into account the efficiency of modern appliances should be between 50 and 60 per cent. The majority of pre-war type fires did not make provision for the supply of heat by convection and their radiant heating efficiency when burning coal was around 20 per cent.
§ 56. Mr. Pitmanasked the Lord President of the Council if he will give, from the facts obtained by the Building Research Centre, Department of Scientific and Industrial Research, the over-all percentage of efficiency of heat from the raw coal delivered to a house with a flue wholly within the house for coal, for gas and coke, and for electricity, all with modern appliances.
§ Mr. H. MorrisonI regret that the analysis of the results of the research mentioned by the hon. Member has not yet been carried to a point where definite conclusions could be drawn in the form of comparative figures.