How to Use the Psychrometric Calculator

The cooling coil calculator shows how much heat a coil in an air handling unit removes and how much water condenses out of the air. This episode works through an air handler in summer step by step, covering total, sensible and latent capacity, the SHR, the condensate rate, scenario comparison and the cooling process on the psychrometric chart.

In winter, cold fresh air mixes with return air in an air handling unit, and the mix is then heated in the heating coil. This episode calculates both steps in turn with the air mixing and heating coil tools, showing mixing by mass, the heating capacity, the hot water flow and why relative humidity falls when air is heated.

In plastics production, moisture does harm in two ways: moisture inside the granules causes defects and hydrolysis during processing, and moisture in the room air condenses on the cold mould surface and causes mould sweating. This episode covers hygroscopic and non-hygroscopic plastics, processing moisture limits, moisture regain in granules, mould sweating with a worked dew point example, why warming the cooling water is not a lasting fix, the lasting fix with dry air, technology choice and capacity sizing.

In chocolate and confectionery production, gloss is often lost at the end of the cooling tunnel. If the cold product surface is below the dew point of the tunnel air or the room air at the exit, moisture condenses on it and sugar bloom begins. This episode covers where condensation begins, why relative humidity can mislead, dew point targets by product, the buffer zone at the exit, infiltration, a worked moisture load and dry-air flow, and choosing the right dehumidification technology.

The same electrode steam humidifier can give very different cylinder life on two sites: on one the cylinder lasts a long time, on the other it is replaced far more often. The difference comes from the feed water and how the unit is operated. This episode covers how minerals build up in the cylinder as steam is produced, how scale coats the electrodes, the conductivity band, the drain balance, foaming, water treatment choices and the effect of the operating profile on life, and compare them with resistive humidifiers that have a cleanable steam tank.