How was low RH possible with A/C plants, prior to introduction of Desiccant Dehumidifiers?
Low RH requires very special methods for estimating moisture loads. Once moisture loads are correctly quantified, to achieve low RH with air conditioning/ refrigeration, it is necessary to select a very low gas suction temperatures and accordingly design and select a cooling coil that will provide a low apparatus dew point of about 34°F to 35°F. Considerable reheat has to be injected to maintain the desired room conditions by this approach. This method is quite cumbersome, uneconomical, complicated and requires very precise control approach to prevent coil freeze up. With this complicated method, if moisture was correctly estimated, relative humidity as low as 40% were being maintained, prior to the introduction of the rotary chemical dehumidifiers. For even lower RH, designs were attempted by going further lower in suction temperatures, below freezing point, and freeze ups being prevented by continuously having to spray brine. This not only made the equipment more bulky and cumbersome
Related Questions
- My WeatherHawk RH readings are very low, or always zero-, when it is obvious that the RH is higher. How is this possible and can it be repaired?
- What is the range and capability of Desiccant Dehumidifiers and to what level can relative humidity (RH) be controlled by them ?
- How was low RH possible with A/C plants, prior to introduction of Desiccant Dehumidifiers?
