How and in which step can we insert heat balance at the air cooler design procedure?
Is it in-line with iteration during calculation of the air outlet temperature?
Which heat balance do you consider?
The heat balance of the cooled spaces is the essential input data for sizing the coolert power at the earliest stage. One possibility is to consider the worst case (warmer day, highest possible internal heat loads), but this option generally lead to obversized plants (higher cost, lower energy efficiency). It is thereforen generally recommended to compute the heat balance of the cooled spaces on a hourly bsasios, and to size the cooling power to cover the requirements most of the time (say 95% or 99% of the occupied hours).
The cooling power at the air outlet is proportional to the air flow rate multiplied by the temperature difference between inlet and outlet. This cooling power should be equal to the heast entering in and generated in the cooled space.
Thank you professor Claude-Alain Roulet.
As you mentioned, 'cooling power should be equal to the heat entering in and generated in the cooled space', we can calculate outlet air temperature (from cooler). In the other hand we can calculate this temperature by a design procedure of air-cooler. Can we integrate these two methods to find correct air out-temperature (which is the mixed stream)? And, how we can handle it with codes?
Kind regards
Talieh
Outlet emperature can be calculated from the combined heat and mass airflow balances, assuming complete mixing in the room. As far as I know, this could be performed using software packages such as TRNSYS or COMIS, but I am not very familiar with them. At steady state, it can be calculated by hand if the airflow rate is known.
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