A Full-Solid-State Humidity Pump for Localized Humidity Control

DOAS & Humidity Control

AS HRAE Jou rna l ash rae .o rg M a y 2 0 0 8 Michael D. Larrañaga, Ph.D., P.E., is Simplex Professor and department head of the School of Fire Protection and Safety at the Oklahoma State University, School of Fire Protection and Safety Engineering Technology, Stillwater, Okla. Mario G. Beruvides, Ph.D., P.E., is professor and director of the Center for Systems Solutions at Texas Tech Universit...

Humidity Control in School Facilities

Consulting engineers who design school facilities are challenged with controlling space humidity while also providing continuous ventilation as required by ASHRAE Standard 62-1999, now part of most major building codes. What would appear to be a simple design process is complicated by various logistical and operational factors. Schools, by nature, have a high occupant density which results in l...

Raoult’s law revisited: accurately predicting equilibrium relative humidity points for humidity control experiments

The humidity surrounding a sample is an important variable in scientific experiments. Biological samples in particular require not just a humid atmosphere but often a relative humidity (RH) that is in equilibrium with a stabilizing solution required to maintain the sample in the same state during measurements. The controlled dehydration of macromolecular crystals can lead to significant increas...

Relative humidity hysteresis in solid-state chemical reactivity: a pharmaceutical case study.

The chemical reaction rate for solid-state product formation in a pharmaceutical case study was monitored by equilibration with either a 75%, 21.5%, 75% relative humidity (RH) cycle ("high-low-high", HLH) or a 21.5%, 75%, 21.5% RH cycle ("low-high-low", LHL). For the HLH cycle, it was found that the degradant formation rate was reversible; that is, the rate at the final 75% RH step was equivale...

DEHUMIDIFICATION: Supermarket Humidity Control Design Guide