Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2017.22.31ReshidMeseret NasirMuhamadWan Mansor WanMajidMohd Amin Abd12017171Background and Objective: Waste Heat Recovery (WHR) system enables to recover the exhaust heat from gas turbine to produce a useful energy. However, the amount of exhaust heat recovered from the turbine is depending on the various operating variables i.e., ambient temperature and fuel flow rate. Hence, this study focuses on the effect of operating variable on WHR system using transient simulation. Materials and Methods: The TRNSYS simulation environment is adopted to develop the WHR system model to understand the system’s transient operation and evaluate the operating variables of waste heat recovery system. The effect of ambient temperature and mass flow rate on operating variables has been studied by considering academic institution waste heat recovery system which is driven by a gas turbine has a capacity of 5.2 MW. Results: Results indicate that 20% variation of ambient temperature (°C) could lead to 0.7% changes in power generated and 1.7% changes in steam generation. With respect to fuel flow rate, 10% changes of fuel flow rate could lead to about 4 and 8.7% changes on turbine power and steam generated, respectively. Conclusion: This transient study of the waste heat recovery could be useful to the operator to carry out the performance analysis and design of the control WHR system for safe and optimum performance operation.]]>Kaviri, A.G., M.N.M. Jaafar, M.L. Tholudin and G. Shariﬁshourabi,2013Koo, K.H., M.R.R. Chand, H. Ibrahim, A. Abd Aziz and F. Basrawi,2015Hordeski, M.F.,2011Dincer, I. and C. Zamfirescu,2011Gronstedt, T.,2000Baheta, A.T. and S.I. Gilani,2010Wahab, A. and T. Ibrahim,2016Savola, T. and I. Keppo,2005Consonni, S. and P. Silva,2007Sanaye, S. and M. Rezazadeh,2007Descombes, G. and S. Boudigues,2009Klein, S.A., W.A. Beckman, J.W. Mitchell, J.A. Duffie and N.A. Duffie et al.,2004Schwarzbozl, P., U. Eiden, R. Pitz-Paal and S. Jones,2006Ganapathy, V.,1996Rahman, M.M., T.K. Ibrahim and A.N. Abdalla,2011Ibrahim, T.K. and M.M. Rahman, 2012Baheta, A.T. and S.I.H. Gilani,2009