Mechanical and Desiccant Dehumidification Equipment, Heat Pipes and Components
ASHRAE Technical Committee 8.10

Scope of TC 8.10

TC 8.10 is principally concerned with mechanical and solid/liquid desiccant dehumidification equipment and heat pipes and their design performance, applications engineering, related load calculations, commissioning, operation, and maintenance. The committee is also concerned with the integration of desiccant equipment and components into other systems and with fundamental abstracts of heat and mass-transfer as they relate to desiccant materials and compounds.

This document of goals and objectives is intended to give the TC long-term, specific direction and help prioritize activities.


The ASHRAE Handbook is published in a series of four volumes, one of which is revised each year, ensuring that no volume is older than four years. The Handbook can be purchased at the ASHRAE Bookstore by clicking on this link.

TC 8.10 is responsible for "Chapter 32 Sorbents and Desiccants" in the Fundamentals volume of the ASHRAE Handbook as well as "Chapter 24 Desiccant Dehumidification and Pressure-Drying Equipment", "Chapter 25 Mechanical Dehumidifiers and Related Components", and "Chapter 51 Dedicated Outdoor Air Systems" in the HVAC Systems and Equipment volume of the ASHRAE Handbook.

Comment on the Handbook: ASHRAE welcomes your comments on the Handbook or a specific Handbook chapter.  To submit a comment about any aspect or part of the Handbook series, you can use the Handbook Comment Form.

Review a Handbook Chapter: To provide your feedback about a specific Handbook chapter, you can answer the brief survey questions on the Handbook Chapter Review Form.


Technical committees develop and sponsor technical sessions at the winter and annual conferences. Information about their future technical program is discussed at each TC meeting and at the TC’s Program Subcommittee meeting.

ASHRAE publishes papers and transactions from presentations at its conference events. In addition, ASHRAE records most of the seminar sessions from its conferences on DVD. These DVDs are ideal for use at chapter meetings, in university courses, or company lunch and learns. Products available from the most recent conference may be found here.

TC 8.10 regularly sponsors seminars or forums at the summer and winter ASHRAE society meetings. If you have an idea for a future program (seminar, forum, or transactions paper) send it to the TC 8.10 Chair (see contact info on the home page).


Technical Committees are responsible for identifying research topics, proposing research projects, selecting bidders, and monitoring research projects funded by ASHRAE. Information about their specific research program is discussed at each TC meeting and at the TC’s Research Subcommittee meeting.

TC 8.10 sponsors the following research project:

Standards & Guidelines

ASHRAE writes standards for the purpose of establishing consensus for: 1) methods of test for use in commerce and 2) performance criteria for use as facilitators with which to guide the industry. ASHRAE publishes the following three types of voluntary consensus standards: Method of Measurement or Test (MOT), Standard Design and Standard Practice. ASHRAE does not write rating standards unless a suitable rating standard will not otherwise be available. ASHRAE is accredited by the American National Standards Institute (ANSI) and follows ANSI's requirements for due process and standards development. Standards may be purchased at the ASHRAE Bookstore.

TC 8.10 is the cognizant committee for the following standards and guidelines: 
1) Standard 139: Method of for Rating Desiccant Dehumidifiers Utilizing Heat for the Regeneration Process
2) Standard 174: Method of Test for Rating Desiccant-Based Dehumidification Equipment
3) Standard 190: Method of Testing for Rating Indoor Pool Dehumidifiers
4) Standard 198: Method of Test for Rating DX-Dedicated Outdoor Air Systems for Moisture Removal Capacity and      Moisture Removal Efficiency
5) ASHRAE Design Guide for Dedicated Outdoor Air Systems (DOAS)

Other Activities

TIP: If MTG involvement add here otherwise leave blank.

TC 8.10 participates on the following multi-disciplinary task groups:

Controlled Environment Agriculture
MTG.CEA will coordinate TC/TG/TRG technical activities related to the design of indoor plant production facilities and their HVAC&R systems. The priority of the MTG will be coordinating communication and opportunities between and through each of the involved committees to align and provide an ASHRAE society stance and direction for the development of plant production facilities. There is an ASABE standard in development, X653, which focuses on environmental conditions for indoor plant production facilities. This ASHRAE MTG will help guide designers, engineers and owners on how to best design and select the HVAC&R systems and equipment given the conditions in that standard. The MTG would ensure that aspects related to energy efficiency, efficacy, and selection of optimum HVAC&R systems are well understood within ASHRAE.

Low Global Warming Potential Alternative Refrigerants
MTG.LowGWP is established to coordinate TC/TG/TRG technical activities to help transition the HVAC&R industry to sustainable lower Global Warming Potential (GWP) alternative refrigerants. The MTG will further request participation from US EPA and AHRI. The MTG responsibilities include suggestions for research, development and presentation of technical programs of all types on alternative lower GWP refrigerants, suggestions for Life Cycle Climate Performance (LCCP) systems evaluation for different applications, development of lower GWP solutions for different applications, and a special publication detailing aspects of LCCP applied to the HVAC&R fields.


ASHRAE Technical FAQs are provided as a service to ASHRAE members, users of ASHRAE publications, and the general public. While every effort has been made to ensure their accuracy and reliability, they are advisory and provided for informational purposes only, and in many cases represent only one person’s view. They are not intended and should not be relied on as an official statement of ASHRAE. Technical questions not addressed may be submitted to the ASHRAE Technical Services department at