Thermodynamics calculations are used to determine the right amount of heat load for a specific enclosure, while heat load refers to the amount of heat needed to keep an enclosure within the desired temperature range. The following heat loads for the Airbus A320 cabin have been estimated assuming steady state conditions. Using first law analysis and the principle of the conservation of energy determine the heat load for the airbus A320 based on the information in table Qu 1. Is the aircraft cabin in need of heating or cooling? Heat loads within an A320 Aircraft Convection from External Insulated Wall Convection from Non-insulated Wall Convection from Insulated Bulkhead Walls Convection from Non-Insulated Bulkhead Wall Convection from Non-Insulated Projections Convection from Floor (Q4) (QS) (Q6) (Q7) (Q8) Radiated Heat from Non-Insulated Projections (Q9) Solar Radiation through Passenger Compartment Windows (Q10) Solar Radiation through Windscreen (911) Solar Radiation through Flight Deck Side Windows (Q12) Radiated Heat from Non-Insulated External Wall Radiated Heat from Non-Insulated Bulkhead Wall Convection through Passenger Compartment Windows Convection through Windscreen Convection through Flight Deck Side Windows Occupants Metabolic Heat Release Electrical and Avionic Heat Load (Q1) (Q2) (Q3) Table Qu 1 Heat load values for the Airbus A320. (Q13) (Q14) (Q15) (Q16) (Q17) kW -0.78 -1.93 +0.007 +0.001 -0.48 -0.455 -0.812 +0.000532 -0.23 +0.268 +0.595 +0.207 -0.149 -0.257 -0.253 +1.856 +0.5