Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2012.2636.2640MajidMohd Amin AbdSulaimanShaharin A.IbrahimIdrisBaharddinZuhairi1220121224The objective of this study is to develop a causal model for
estimating the amount of chilled water that can be produced from generated waste
heat during off peak period of a district cooling plant. The methodology adopted
is to calculate the amount of waste heat generated by the gas turbines of the
plant during peak and off peak operations. Ten months of 2009 historical data
of waste heat generated during peak and off peak periods were analyzed. The
chilled water produced by absorption cooling for the ten months during peak
period was also analyzed. Mathematical models using the causal relationship
of the waste heat generated with the chilled water produced during the peak
period for the ten months were formulated. Three models were formulated using
the data namely linear, quadratic and exponential. The R^{2} values
obtained are 0.5034, 0.784 and 0.5128 for the linear, quadratic and exponential
respectively. Since the R^{2} value for the quadratic model is the highest,
the quadratic model is used to evaluate the amount of chilled water that could
be generated from the off peak waste heat. From the calculation, it is estimated
that an average of 520,310 RTh of chilled water could be produced monthly from
the off peak waste heat. This is 79.7% of the chilled water produced during
peak period. Based on these findings the waste heat during off peak if converted
to chilled water using absorption process will lead to economic benefits as
well as reduced emission to atmosphere. Further detail study will be undertaken
to enhance the model and to establish the design configuration of the system
to recover the off peak waste heat for chilled water production by absorption
process.]]>UNEP,2006Gilani, S.I.H., M.A.A. Majid and C. Rangkuti,2006Dincer, I.,2002Hussain, M.M., I. Dincer and S.M. Zubir,2004Khan, K.H., M.G. Rasul and M.M.K. Khan,2004Abdul Karim, Z.A. and A.Y.P. Waden,2011Rahman, M.M., T.K. Ibrahim and A.N. Abdalla,2011