Design of VRF system

Abstract

Air conditioning demand is rapidly increasing in many parts of the world especially in moderate climate. Air conditioners and refrigerators are the only equipment consumes more electricity say 70 percent house hold articles this result in drastic electricity demands on hot summer days which causes unwanted increase in the use of fossil fuel and nuclear energy which leads to global warming and air pollution. The VRF system uses R410A as refrigerant because it contains only Fluorine hence it has very low global warming potential. VRF systems are enhanced versions of ductless multi-split systems, permitting more indoor units to be connected to each outdoor unit and providing additional features such as simultaneous heating and cooling and heat recovery. VRF technology uses smart integrated controls, variable speed drives, refrigerant piping, and heat recovery to provide products with attributes that include high energy efficiency, flexible operation, ease of installation, low noise, zone control, and comfort using all-electric technology. VRF systems are very popular in Asia. This thesis presents design of Variable Refrigerant Flow (VRF) system for an office building in Vashi, Navi Mumbai. The VRF system was selected as the space saving was priority of the client. The system is designed using ISHRAE hand book and Toshiba manual. The heat load was calculated considering various factors such as outdoor condition, heat gain through glass, transmission gain through wall etc. As per the heat load calculated proper selection of outdoor unit and indoor unit was done using Toshiba manual. The schematic of pipe and indoor is displayed considering cost effectiveness. The obtained results were validated by the industry. Keywords: R410A, ISHRAE, outdoor unit, indoor unit, cassette, British Thermal Unit, compressor