If an object receives heat from a heat reservoir, is it necessary for the heat receiver to release heat? Can the heat receiver increase its internal energy without heat flow out of the receiver? And what happens when the system between heat provider and heat receiver reaches a steady state equilibrium where the infinitesimal difference in temperature between the receiver and provider cycles the heat flow? Does that mean that entropy is always increasing in an isolated insulated system between the receiver and the provider of heat??? or should we consider a system at steady state equilibrium as a perfectly quasistatic reversible process where the cyclic entropy equates to zero???