The impact of the wall insulation material and variable refrigerant flow system on building energy consumption and cost

The use of VRF system and insulation in building envelope are both considered as promising option to reduce energy consumption a building. This study analysis saving potential using modelling simulation typical office model is simulated with the weather Hyderabad, Sindh, Pakistan EnergyPlus software. cases include conventional air conditioning systems without evaluate compare annual cooling savings payback period. Results showed that by replacing conditioner AC electrical power can be reduced 42-45%. It also noted Cellulose, expanded polystyrene, extruded polystyrene polyurethane insulations save around 49.5, 51.4, 51.6, 54.54% electricity, respectively. In case used may electricity 66.5, 67.4, 67.5 68.9 %, period varies from 7 15 months. However, cellulose has least longest months was for un-insulated conditioner. Despite having longer period, combination most efficient combination.