The Hartman Company - ASHRAE Article

Principal, Thomas Hartman, has authored an article on all-variable speed chiller plants in the September issue of the ASHRAE JOURNAL. This is the most comprehensive discussion of what is know as the "LOOP" chiller plant optimization technologies to date. It provides background on the use of variable speed in chiller plants, discusses cost and savings implications, and goes as far as describing the actual algorithms employed to provide the LOOP optimized control for all-variable speed chiller plants. This article has undergone the ASHRAE peer review process so all the information it contains can be counted upon to be accurate.

This article is particularly important because it introduces control strategies based on the "Equal Marginal Performance" Principle. Such strategies have now been developed to integrate the entire HVAC system such that energy use for entire facility can be dramatically reduced with very simple network based control. You will be hearing much more about the Equal Marginal Performance Principle and how in is employed to improve building environmental control over the next few months. We will keep you updated.

Additional information about the LOOP all-variable speed chiller technologies is available on-line. Here are references we recommend for those of you interested in chiller plant optimization:

1. A paper Mr. Hartman presented several years ago to a joint ASHRAE/ASME conference on new energy efficiency technologies discusses how the LOOP technology was developed and its expected energy savings in various climates. It can be obtained at:
http://hartmanco.com/pdf/pre11.pdf 

2. A list of frequently asked questions and their answers about Hartman LOOP technologies can be obtained at:
http://hartmanco.com/pdf/a33.pdf 

3. An example that compares the energy use of a chiller plant operating with Hartman LOOP technologies to the energy use of conventionally operated chiller plants can be obtained at:
http://hartmanco.com/pdf/a35.pdf 

4. An overview discussion of developing distribution systems that integrate into LOOP plants to eliminate low delta T problems is available at:
http://hpac.com/member/archive/0104freaks.htm 

5. Finally, an brief piece that focuses on operational approaches to improving chiller plant efficiency can be obtained at:
http://automatedbuildings.com/news/jan01/articles/hartman/hrtmn2.htm 

If you have questions, suggestions or comments regarding the ASHRAE JOURNAL article or any other issue please do not hesitate to e-mail Mr. Hartman directly at: thartman@hartmanco.com     

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