Figure Q4 represents a sun room with 3 external walls facing North, East and South, respectively and an internal wall containing a double door into the main dwelling facing west. The sun room is to be maintained at 18C throughout the heating season for an outside temperature of -2C. Assuming the main dwelling is to be maintained at 20C, calculate the required heat input to the sun room given the thermal properties of the building components given in Table Q4. Both floors and roof can be taken to be external components. The sun room height can be taken to be 2.7m. Assume all glazed and door elements run full room height. Air exchange occurs from ambient to sun room to ambient. (20 marks) Buildings Component External walls Windows Floors Door Roof Internal surfaces External surfaces U-value (W/mK) 0.25 2.20 0.27 0.50 Thermal Conductance (mK/W) 0.8 Table Q4 Air change for sun room = 0.5 ach1; pCp = 1200 J/mK. Heat transfer Coefficient (W/mK) 8.0 20.0 6.00 m 200 m 10.00 m- 3.00 m Sun Room 3:00 m 2.00 m- N Figure Q4 represents a sun room with 3 external walls facing North, East and South, respectively and an internal wall containing a double door into the main dwelling facing west. The sun room is to be maintained at 18C throughout the heating season for an outside temperature of -2C. Assuming the main dwelling is to be maintained at 20C, calculate the required heat input to the sun room given the thermal properties of the building components given in Table Q4. Both floors and roof can be taken to be external components. The sun room height can be taken to be 2.7m. Assume all glazed and door elements run full room height. Air exchange occurs from ambient to sun room to ambient. (20 marks) Buildings Component External walls Windows Floors Door Roof Internal surfaces External surfaces U-value (W/mK) 0.25 2.20 0.27 0.50 Thermal Conductance (mK/W) 0.8 Table Q4 Air change for sun room = 0.5 ach-1; pCp = 1200 J/mK. Heat transfer Coefficient (W/mK) 8.0 20.0 6.00 m 200 m 10.00 m- 3.00 m Sun Room 3:00 m 2.00 m- N