Dehumidification Effectiveness Research Articles

Effect of Dehumidification of Air on the Performance of Eccentric Circular Fins

A theoretical analysis of the performance of cooling and dehumidifying an eccentric circular fin has been carried out. Numerical results for fin temperature distribution and fin efficiency were obtained for various ranges of psychometric conditions and compared with those of a dry fin. The effect of eccentricity on the fin efficiency was also investigated. It was found that the fin efficiency decreases as dehumidification or eccentricity is increased.

On the Effectiveness of the Puretron in Dental Treatment

The air compressor is one of the many instruments frequently used in dental treatment. The air coming from a compressor must be clean, for it is used for treatment in the oral cavity.As a matter of fact, however, the air is not always clean or sterile as confirmed by our studies and there have been published other studies to the same effect. On the other hand, the literature is still scanty concerning countermeasures for this problem.In the present report, we studied the effectiveness of a Puretron in supplying pure air to the dental unit through the elimination of dust particles, bacteria, and water drops in 2 selected dental clinics.The effectiveness of dust depuration was measured with a Royco 202 airborne particle monitor in which the particle sizes were classified into 15 groups, the effect iveness of sterilization was examined with a SY model pin hole sampler, and the effectiveness of dehumidification was also studied. The following conclusions were obtained.1. The effectiveness of dust depuration in our laboratory was found to be 100% over 15 microns and, in a dental clinic used for the present experimental purpose, it was 100 % over 2.0 microns.2. As regards the rate of bacterial elimination, it was 99.6% in the laboratory, whereas it was 100% in the dental clinic.3. The effect on Serratia marcescens through a spray procedure proved to be 100% when the number of bacterial colonies was 3.60±0.34 pieces/l in the intake part of the Puretron.4. As for the effect of dehumidification, the humidity after having passed through the Puretron was 36% in all the cases under study.In view of an assumption that these instruments will play a greater role in dental treatment in the future, it is desirable that an instrument capable of a higher degree of elimination of dust particles and sterilization should be developed.