A flow of cold water enters a parallel flow heat exchanger at 20°C and leaves at 100°C. The cold water is being heated by a hot water flow that enters the heat exchanger at 160°C and leaves at 120°C. The overall heat transfer coefficient for this heat exchanger is 324 W/m2-K. The heat exchanger must transfer heat between the water streams at a rate of 20 kW. Determine the heat exchanger area required (m2).