EXERGY ANALYSIS OF VARIOUS PARTS OF DUAL CYCLE POWER PLANT WITH ORGANIC RANKINE CYCLE AND ABSORPTION REFRIGERATION SYSTEM

Abstract

The performance of the thermal power station is evaluated through effective performance standards, which is mainly based on the 2nd law of thermodynamics, along with thermal efficiency. Actual loss of useful energy can’t be determine by the applying 1st law of thermodynamics, because it does not differentiate between quality and quantity of energy. Exergetic analysis gives the tool for fair separation between energy losses that occur to the environment and all internal irreversibilities in the process. The effectiveness of exergetic analysis is used to determine magnitudes, location and causes of irreversibilities in the plants, as well as it also gives more meaningful estimate of individual efficiency of plant components. In this analysis of combined cycle integrated with Organic Rankine Cycle and Vapour Absorption Refrigeration System, large losses takes place in the combustion chamber and exergy destruction is also displayed in different parts of the power plant. There are two important criteria in the exergetic analysis: efficiency and exergy destruction. An important application of the exergetic efficiency is the evaluation of the dynamic thermal performance of component or system related to a similar performance. The results exhibit that the highest exergy loss occurs in combustion chamber of the gas turbine, is due to its very high irreversibility. Since the second greatest loss in plant takes place is in HRSG, the optimal use of HRSG will play a crucial role for decreasing the exergy loss of the combined power plant. The results demonstrate that the combustion chamber, along with heat recovery steam generators (HRSG) and gas turbines are key sources of irreversibility. Exergy losses in different vitality components of the power plant have been observed and improved relatively well by using Organic Rankine cycle and vapour absorption cycle. The improvement in these components provides a wide space of improvement for researchers and academicians in the power plant.