ASHRAE 139

Abstract

This standard applies to desiccant-based dehumidifiers operating at atmospheric pressure. The dehumidifier may utilize solid or liquid desiccants that are regenerated utilizing heat energy. <br>Normally, equipment within this standard would consist of one or more desiccant contact stations through which the air to be dehumidified is moved, a means to expose the moisture- laden desiccant to a source of heat energy for regeneration, and a heating device. <br>Ancillary devices are normally utilized to move air to be dehumidified through the device and to provide ventilation for regeneration, but they are not a part of this standard. <br>This standard is intended to <br>a. describe a uniform method of testing for obtaining performance data, <br>b. describe and specify test instruments and apparatus, <br>c. describe and specify test data to be recorded, and <br>d. describe and specify calculations to be made from the test data. <br>This standard does not apply to: <br>a. dehumidifiers operating at other than atmospheric pressure, <br>b. dehumidifiers not utilizing a desiccant for dehumidification, <br>c. dehumidifiers not utilizing heat for regeneration of the desiccant, or <br>d. ancillary equipment that may be used in any dehumidification process such as fans or pre- or post-conditioning equipment. <br><strong>PURPOSE</strong> <br>The purpose of this standard is to provide test methods for determining the moisture removal capacity of heat-regenerated desiccant dehumidifiers as well as the coincident thermal energy performance so that comparative evaluations of capacity and performance can be made irrespective of the type or make of the device.