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Dear TRNSYS users, I am using type 4a to yearly simulate both
a cold tank supplied by an absorption machine and a heat tank supplied by a
cogeneration unit. For the cold tank the following happens: The heat entering the tank is 0.3% higher then
the heat removed from the tank by the absorption machine. Losses heat are
negative, thus an additional amount of heat is supposed to enter the tank. The
difference between the entering heat and the removed heat amounts to 1% of the
latter. However, the temperature in the top and in the bottom of the tank is
the same at the beginning and at the end of the simulation. Can anybody suggest
me what I can chek to solve the matter? For the heat storage, I have what I expect
about the charging and discharging. I mean the heat entering is higher then the
one outgoing and losses are positive so heat is supposed to go out from the
tank. However, the energy balance is not zero and it amounts to 2% of the inlet
heat. Yearly Simulations are carried out with a
timestep of 10 minutes with tolerance integration=0.001 and tolerance convergence= 0.001 21 timesteps, inputs have not converged. Thank you Assunta Napolitano |