Efficient Solar Driven Air Conditioning System for Hot Climate: Case Study of Doha

摘要

An advanced thermal solar driven air conditioning system for hot climate is described and a steady statethermodynamic model is used to predict its performance by using weather data for Doha (Qatar). The proposedsystem combined both Organic Rankine Cycle (ORC) and conventional mechanical Vapour Compression Cycle(VCC) whereby the expander (Turbine) is coupled to the compressor. Both cycles operate with ammoniarefrigerant. For the same collector surface area (20 m~2), the corresponding average daily cooling production ishigh with Evacuated Tube Solar Collector (ETSC) compared to Flat Plate Solar Collector (FPSC): ranging from3.4 kW (in July) to around 7.6 kW (in April) for FPSC and from 4.5 kW (July) to around 10.2 kW (in April) forETSC. The maximum values of COPs obtained (0.50 to 1.60 with an optimum driving temperature of about118°C) are overall above those of standard heat driven systems such as absorption or adsorption refrigerationsystems (typical maximum values range: 0.4 to 0.8).