Book - School of Science and Technology

668 Running costsTable 23.5 Approximate temperature rise due to internal heat gainsBuilding characteristicsTemperatureincrement (K)Large areas of external glazing; muchheat-producing equipment; dense occupancy 5±6One or two of the above characteristics 4±5Traditional with normal levels of glazing,equipment and occupancy 3±4Small glazed areas; little or no heatproducing equipment; sparse occupancy 2±3Residential and dwellings 5±8NoteThese data should not be used for purposes outside this present context.categorised as light, medium or heavy, although it is appreciated that judgement will berequired to interpret these distinctions:Light. Single-storey factory type buildings with little partitioning.Medium Single-storey buildings of masonry or concrete with solid partitions.Heavy Multi-storey buildings with a lightweight facade and solid partitions and floors.With regard to hours of system use, the method allows for continuous running over 24hours or, alternatively, for operation as is appropriate to periods of occupation from 4 to16 hours per day.The routine set out in the Guide Section B18 may be simplified, with no loss of accuracy,by selection of the appropriate degree-day figure from Table 23.4 and an estimated valueof internal heat gain from Table 23.5. The former is then corrected by multiplication usingvalues chosen in turn from each of Tables 23.6±23.8 in order to represent the variousaspects of the problem.For example, consider a building in East Anglia having a traditional heavyweightstructure and provided with a slow response heating system such as hot water radiators.The system is operated intermittently over 30 weeks per annum for a 5 day week andTable 23.6 Factors relating building characteristics to inside and outside design temperaturesInside design temperature ( C)Temperatureincrement fromTable 23.5(K)19 20 21Outside designtemperature ( C)1 2 3 4 1 2 3 4 1 2 3 42 1.40 1.34 1.28 1.22 1.46 1.40 1.34 1.28 1.52 1.45 1.39 1.333 1.27 1.21 1.16 1.11 1.34 1.28 1.22 1.17 1.40 1.34 1.28 1.234 1.14 1.09 1.04 0.99 1.21 1.16 1.11 1.06 1.28 1.22 1.17 1.125 1.01 0.96 0.92 0.88 1.09 1.04 0.99 0.95 1.16 1.11 1.06 1.026 0.88 0.83 0.80 0.76 0.96 0.92 0.87 0.84 1.04 0.99 0.95 0.917 0.76 0.72 0.69 0.66 0.83 0.80 0.76 0.73 0.92 0.88 0.84 0.81