4. A building has a clear, low-E and reflectively coated double-pane window. In summer the incident solar flux is 150 BTU/hr-ft2. The interior is maintained at 75F and the ambient air temperature is 95F. Assume the window conductance is 0.55 BTU/hr-ft-F and its shading coefficient is 0.20. Also assume the reference F value is 0.87. ofra. Determine the window's conduction gain. (BTU/hr-ft) b. Determine the window's solar gain. (BTU/hr-ft) c. Determine the window's total heat gain. (BTU/hr-ft)