Feasibility Study of Using Bleeded Air from a Turbocharger System for Air-Conditioning Purposes

Feasibility study of using bleeded air from a turbocharger system for airconditioning purposes has been performed. An integrated unit which comprises a Diesel reciprocating engine, a turbocharger system, a basic open air refrigeration cycle, and an auxiliary combustion chamber was theoretically analyzed. A detailed mathematical model has been developed and used to simulate the integrated unit. This includes models of the turbine and compressor performance maps, combustion and heat transfer phenomena, and characteristics of the heat-exchangers. The model has been calibrated by using some available experimental data, and used to study the effect of bleeding air from the turbo-charger system on the performance map of the propulsion unit. Notation m mass M* — pseudo non-dimensional mass flow rate A effective area in (Kg'^-K)/(m -sec-KPa) a — longer diameter of ellipse Ν — rotational speed b shorter diameter of ellipse Ν* non-dimensional rotational speed (eq. 5) bmep — brake mean effective pressure Ρ — pressure c f correction factor Q — heat Cv specific heat at constant volume R — specific gas constant Cp specific heat at constant pressure St — Stanton number D compressor diameter τ — temperature D* non-dimensional diameter (eq. 6) t — time Ε energy υ — rotor tip speed F friction power υ * — blade speed ratio (eq. 3) f friction coefficient υ — piston velocity G mass flow rate per unit area ν — volume Η convective heat transfer coefficient Vm — average specific volume h pressure head developed by the compressor, w — work enthalpy Χ' — variable (eq. 9) Κ thermal conductivity Υ — non-dimensional parameter k specific heat ratio Υ' variable (eq. 10) Μ shape factor ζ constant (eq. 20)