A condenser is used as a heat exchanger in a large steam power plant in which steam is condensed to liquid water. The condenser is a shell and tube heat exchanger which consists of 1 shell and 20,000 tubes. Water flows through each of the tubes at a rate of 1 k g / s with an inlet temperature of 30 o C The steam in the condenser shell condenses at the rate of 430 k g / s at a temperature of 50 o C. If the heat of vaporization is 2.326 M J / k g and specific heat of water is 4 k J / ( k g. K ), the effectiveness of the heat exchanger is _____ (rounded off to 3 decimal places).