Answer :
yes, he used the fan because the cool air blow by the fan go away by absorbing some heat from the hot tea such that thermal equilibrium takes place and the tea gets cold
net heat lost by tea = net heat gain by air molecules
net heat lost by tea = net heat gain by air molecules
see we know that evaporation causes cooling and the fast moving air ( caused by the fan ) caused grey evaporation which cooled the tea.... we have read that wind is 1 of the factors influencing evaporation! Thats why...