Artificial intelligence (AI) policy: ASHRAE prohibits the entry of content from any ASHRAE publication or related ASHRAE intellectual property (IP) into any AI tool, including but not limited to ChatGPT. Additionally, creating derivative works of ASHRAE IP using AI is also prohibited without express written permission from ASHRAE.

As a part of ASHRAE's move to our new global Headquarters, we will be moving some of our web servers Saturday, October 3. During this time, ability to join or renew, access subscriptions or purchase content for which an ASHRAE login is required will be unavailable. We expect the downtime to be less than 24 hours.

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ASHRAE Handbook Online provides convenient, web-based access to all four volumes of the ASHRAE Handbook anytime for your individual use. Corporate and multiuser access to the ASHRAE Handbook is available through ASHRAE Digital Collections. To learn more about how you can get access for your office, please visit ashrae.org/digitalcollections.

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. Each volume is available in I-P (Inch-Pound) or SI (System International) units of measurement. Contact Handbook Editor Heather Kennedy via e-mail at hkennedy@ashrae.org.

ASHRAE supports the use of ASHRAE Standards and ASHRAE Handbook internationally. Procedures and policies are in place to promote such uses while protecting ASHRAE's intellectual property and technical credibility. Agreements vary depending on source of requests (ASHRAE chapters, Associate Societies, commercial publishers or other commercial firms, government, standards bodies, other associations, and educational institutions). ASHRAE also considers requests for translation of other ASHRAE books, articles, and papers. To request a translation agreement, contact Mark Owen, Publisher/Director of Publications & Education, at mowen@ashrae.org.

The ASHRAE Handbook is the four-volume flagship publication of the nonprofit technical organization ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers[a]). This Handbook is considered the most comprehensive and authoritative repository of practical knowledge on the various topics that form the field of heating, ventilation, air-conditioning, and refrigeration (HVAC&R).[b]

The four volumes are Fundamentals, Refrigeration, HVAC Applications ("Applications"), and HVAC Systems and Equipment ("Systems and Equipment"). Members of ASHRAE receive the current volume, in both print and CD-ROM form, each year as a basic membership benefit. An enhanced electronic version, known as ASHRAE Handbook Online is a web-based version updated annually that contains the four latest volumes as well as extra content such as calculations, demonstration videos, and spreadsheets. The various versions of the Handbook are typically available to the public via technical, and other, libraries and bookstores.[citation needed]

The ASHRAE Handbook has had a variety of titles.[5] It began in 1922 as the ASH&VE Guide. In 1973 it became the ASHRAE Handbook, and in 1985 separate publication of inch-pound (I-P) and international system (SI) units versions of the volumes began. The current publisher of record is W. Stephen Comstock, and the Editor is Mark S. Owen. The Handbook is published by ASHRAE from its headquarters in Atlanta, Georgia.

The Handbook's content is created and modified by volunteers via ASHRAE's many Technical Committees (TCs), and then edited and formatted by professional staff at ASHRAE. For example, three chapters, in three different volumes, are maintained by TC 5.3, Room Air Distribution. Each chapter within a particular volume is reviewed and revised in a repeating four-year cycle; one volume is printed each year.[6] In the summer of 2017 the new Fundamentals' volume was released. ASHRAE's Handbook Committee maintains an Authors and Revisers Guide, which can be obtained freely via the Handbook portion of the ASHRAE Web site.

While each new or revised chapter manuscript is to be reviewed for technical content by each TC voting and corresponding member before publication, there are often many other pre- and post-publication reviewers. For example, members of the Society's Handbook Committee and the College of Fellows[7] review chapters each year. Reviews, from basic comments to detailed new content, are encouraged from all users of the Handbook and may be submitted through an online commenting system.

If you would like to get involved in this TC's activities you can contact the appropriate Point of Contact in the TC 9.9 Work Items listing, attend the biannual meetings, or contact our committee chair at tc0909@ashrae.net. In addition to this website, visit our LinkedIn page and follow us!

Liquid Cooling Guidelines for Datacom Equipment Centers

The content previously covered in Liquid Cooling Guidelines for Datacom Equipment Centers has been almost entirely rewritten to include the most current industry thinking and consensus on the need for further guidance on liquid cooling. The content included on this site provides expanded and new information, including the following:

Emergence and Expansion of Liquid Cooling in Mainstream Data Centers White Paper

The IT industry is at a performance inflection point. When purchasing a new computing device, it is expected to be more powerful than the previous generation. As for servers, over the last decade the industry had a period where significant performance increases were delivered, generation over generation, accompanied by modest and predictable power increases. That period ended around 2018. Large power increases in the compute, memory, and storage subsystems of current and future IT equipment are already challenging data centers, especially those with short refresh cycles. The challenges will only increase. Liquid cooling is becoming a requirement in some cases, and should be strongly and quickly considered. This white paper explains why liquid cooling should be considered, rather than the details around what liquid cooling is or how to deploy it.

Cold Weather Shipping Acclimation and Best Practices

This white paper addresses the prevention of damage to sensitive IT equipment caused by cold weather shipping conditions, providing additional guidance for shipping IT equipment that is not covered in the latest edition of Thermal Guidelines for Data Processing Environments. In addition to outlining cold weather shipping practices and packaging for various modes of transportation, this white paper covers acclimation time guidelines for both large equipment such as racks, cabinets, and frames and smaller field-replaceable components such as disk drives, PCIe cards, and memory modules.

Edge Computing: Considerations for Reliable Operation Technical Bulletin

This technical bulletin highlights the environmental and reliability challenges of edge data centers and the design and maintenance challenges of these data centers that are surrounded by semi-controlled or even uncontrolled external environments. You can find this bulletin here along with other TC 9.9 publications.

ASHRAE TC 9.9 Liquid Cooling White Paper

TC 9.9 has released a new white paper entitled "The Advancement of Liquid Cooling Solutions: The Perfect Storm Brewing" which addresses the growing trend of liquid cooling solutions in the data center. This brief is a window into a more comprehensive TC 9.9 white paper to be released later this year.

TC 9.9 Approved Definitions for Data Centers, ITE, and ITE Enclosures

TC 9.9 is recognized as a leader in driving the data center environmental knowledge and best practices in the industry. At the ASHRAE Annual Meeting in Orlando, TC 9.9 discussed one area where we must help to align our industry. Previously TC 9.9 has not provided definitions for ITE and locations where it is housed. It is essential that we do this to meet our mission "To be recognized by ALL areas of the datacom industry as the unbiased engineering leader in HVAC and an effective provider of technical information for the datacom industry."

It is important for data centers to be excluded from codes written for human occupancy. Even an IT server rack does NOT fit human occupancy codes. Racks that belong in human occupancy codes are ones supporting building services such as fire, security, HVAC, audio / video, etc. These racks are typically far less than 2 KW per rack. There might be occasional exceptions but those are minor compared to human occupancy codes requiring economizers on 2 KW IT server racks.

TC 9.9 has approved the following definitions for use by those needing to quantify data center related terms. Please consider them as the position of TC 9.9 as we move forward in developing standards, codes and general communications for our industry.

Anyone know what the performance standard is for cooling a home when outside temperatures are under 95F?

I know at 95F and above a 15 degree difference is acceptable.

Also, is the differential measured from return to plenum or outdoor verses indoor?

Thanks!

When I started working for a large company that focused on residential I was going to HVAC school at the same time. I learned from the books plus the way the old timers have always charged units. I would check the freon levels (by the book) after they where done installing the units and found that as long as the outside temperature was above 70 degrees, these old timers were ending up charging them within +/- 3 psi of the pressure I got using the super heat method. After working with them for a while, I learned how to check the charge with my hand on the suction line, know if the outside unit is dirty by touch the liquid line, check the Freon charge by looking at the temp on the Freon gauge plus a lot more other methods. 152ee80cbc

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