Heating Load on Factory (Chapters 1, 4 and 5) Design a heating system for a small factory in Denver, Colorado. This is a multistep problem that will be continued in subsequent chapters. In the first step, you are to determine the heating load on the building, i.e., the rate at which the building loses heat in the winter, if the inside temperature is to be maintained at 20°C. In order to compensate for this heat loss, you will subsequently be asked to design a suitable heater that can provide a rate of heat transfer equal to the heat load from the building. A schematic diagram of the building and construction details for the walls and ceilings are shown in the figure. Additional information may be obtained from the ASHRAE Handbook of Fundamentals. For the purpose of this analysis, it may be assumed that the ambient temperature in Denver is equal to or greater than -10°C 97% of the time. Furthermore, air infiltration through windows and doors may be assumed to be approximately 0.2 times the volume of the building per hour. For the initial estimate of the heat load, you may use average values for the convective heat transfer coefficients over the inside and outside surfaces from Table 1.4. Note that for this design, the outside temperature assumes the worst possible conditions and, if the heater is able to maintain the temperature under these conditions, it will be able to meet less-severe conditions as well. After you have completed the initial design, examine the results and prepare a report for the architect and the owner of the building, pointing out how the thermal design could be improved. Note especially any areas where excessive heat losses may occur. After you have studied Chapters 4 and 5 you will be asked to repeat the heat loss calculations, but calculate the heat transfer coefficient from information presented in these chapters.

 

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