Heat exchanger for a combined cycle power plant

A method of operating a combined cycle power plant, the method comprising:

• passing a coolant through a cooling system into a gas turbomachine portion of the combined cycle power plant (CCPP);
• absorbing heat from the gas turbomachine into the coolant;
• directing the coolant through a heat exchange member;
• guiding a steam condensate through a steam condensate system fluidly connected to a steam turbomachine portion of the CCPP;
• passing the steam condensate through the heat exchange member;
• transferring the heat entrained in the coolant to the steam condensate in the heat exchange member to form heated steam condensate;
• passing the heated steam condensate to a heat recovery steam generator (HRSG);
• sensing a temperature differential between the coolant and the steam condensate;
• and
• disconnecting the heat exchange member from the cooling system and connecting a fin-fan cooler to the cooling system if the temperature differential is outside a predetermined temperature range.