Thanks.nI set an inlet temperature of 415K for the hot fluid and 300K for the cold one. When I run my simulation I get a final temperatures of 407.68K and 306.77K for the hot and cold fluids. But when I do the heat balance is when I realise it is not completely right as the heat the hot fluid loses is not the same as the heat the cold fluid gets.nQ(hot) = m(hot)?Cp(hot)?(Ti-Tf) = 27.180,33kW nQ(cold) =m(cold)?Cp(cold)?(Tf-Ti) = 25.480'92 kWnI don't know what is wrong, any idea?nThanksn