Heating and Ventilation (Google eBook)

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McGraw-Hill, 1922 - Heating - 332 pages
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Page 1 - ... two quantities to be considered: the intensity of heat and the amount of heat. A small piece of white-hot metal may not contain so great a quantity of heat as a pail of warm water, but the intensity of the heat in the former is much greater. The intensity of heat is denoted by the term temperature. One measure of the intensity of heat in a body is its ability to transmit heat to a body of lower temperature. Heat will flow from a body of higher temperature to one of lower temperature but will...
Page 55 - X .5 (32 - 20). The heat necessary to melt the ice equals 10 X 144; the heat necessary to raise the melted ice to the temperature of the mixture equals 10(< 32) ; the heat necessary to raise the water to the temperature of the mixture equals 20...
Page 5 - ... consequence. The external work may be computed by multiplying the pressure by the change in volume. When heated at constant, volume no external work is. done as no movement is made against an external resistance.
Page 1 - ... heat to a body of lower temperature. Heat will flow from a body of higher temperature to one of lower temperature but will never flow, of itself, from one body into another of higher temperature. When two bodies of different temperatures are placed in contact, a heat exchange takes place until they are at the same temperature and thermal equilibrium is reached. We may, therefore, state that two bodies are at the same temperature when there is no tendency for heat to flow from the one to the other....
Page 5 - In other words the potential energy of 772 pounds elevated one foot above the ground is equivalent to the quantity of heat necessary to raise the temperature of one pound of water from 55 F.
Page 70 - The effect of painting is to change the radiation constant of the radiating surface and has practically no effect upon the heat lost by convection. It is, therefore, a surface effect and it makes no difference what paints are placed on the radiator as a priming coat, the results are always dependent upon the last coat of paint put upon the radiator. In radiators having a large proportion of radiating surface such as pipe coils or wall coils, the effect of painting will be more marked than in four-column...
Page 2 - ... of these names as abbreviations, as has already been done in this text. Where temperatures below the zero point of a scale are denoted, the subtraction or minus sign of arithmetic is placed before the figure denoting the number of degrees. Thus, 5 F. would mean five degrees below the zero point on the Fahrenheit scale. On this scale, the freezing point of water is marked 32 degrees, the zero point consequently being 32 degrees below freezing. At sea-level, water under atmospheric pressure...
Page 70 - It is, therefore, a surface effect and it makes no difference what paints are placed on the radiator as a priming coat, the results are always dependent upon the last coat of paint put upon the radiator. In radiators having a large proportion of radiating surface such as pipe coils or wall coils, the effect of painting will be more marked than in four-column radiators having a comparatively small radiating surface in proportion to convecting surface. All finely ground materials have about the same...
Page 8 - When mechanical energy is produced from heat a definite quantity of heat goes out of existence for every unit of work done; and conversely, when heat is produced by the expenditure of mechanical energy the same definite quantity of heat comes into existence for every unit of work spent.
Page 50 - ... the heat of the liquid, which is the heat required to raise the temperature of the water from 32 to the temperature of the boiling point...

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