The geometry of an office room located in the middle of the building's faade is: 3.0...
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The geometry of an office room located in the middle of the building's faade is: 3.0 m (height), 3.0 m (width) and 4.0 m (depth). The area of the window (installed on the exter- nal wall) is 2.5 m. The U-values are 0.20 W/mK (external wall), 1.4 W/mK (window) and 0.35 W/mK (internal walls). There is a thermal bridge (length 1.2 m, additional con- ductance 0,8 W/mK) on the external wall. The supply air temperature is +19C and the air flow rate is 2 L/s, m. The infiltration air flow rate is 0.1 1/h (exchanges per hour). The building is located in Sodankyl and the indoor temperature is 21 C. The internal heat gains are: 75 W (one occupant), 15 W/m (lighting) and 150 W (appliances). The working hours for each weekday (Monday to Friday) are from 8 am to 4 pm (8:00-16:00) and there are 20 workdays within a month. The ventilation is in operation on workdays only. a) Calculate the heating load (for room heater, e.g. radiator) in the design conditions. b) How much can the heating energy demand (room heater) be reduced in December due to internal heat gains in a comparison with a scenario not taking them into ac- count? (Due to the heater control, 80% of the heat gain can be utilized.) The geometry of an office room located in the middle of the building's faade is: 3.0 m (height), 3.0 m (width) and 4.0 m (depth). The area of the window (installed on the exter- nal wall) is 2.5 m. The U-values are 0.20 W/mK (external wall), 1.4 W/mK (window) and 0.35 W/mK (internal walls). There is a thermal bridge (length 1.2 m, additional con- ductance 0,8 W/mK) on the external wall. The supply air temperature is +19C and the air flow rate is 2 L/s, m. The infiltration air flow rate is 0.1 1/h (exchanges per hour). The building is located in Sodankyl and the indoor temperature is 21 C. The internal heat gains are: 75 W (one occupant), 15 W/m (lighting) and 150 W (appliances). The working hours for each weekday (Monday to Friday) are from 8 am to 4 pm (8:00-16:00) and there are 20 workdays within a month. The ventilation is in operation on workdays only. a) Calculate the heating load (for room heater, e.g. radiator) in the design conditions. b) How much can the heating energy demand (room heater) be reduced in December due to internal heat gains in a comparison with a scenario not taking them into ac- count? (Due to the heater control, 80% of the heat gain can be utilized.)
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Income Tax Fundamentals 2013
ISBN: 9781285586618
31st Edition
Authors: Gerald E. Whittenburg, Martha Altus Buller, Steven L Gill
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