John Siegenthaler, PE

John Siegenthaler, PE

John Siegenthaler, P.E.
Principal of Appropriate Designs
john@hydronicpros.com

The third edition of his book, Modern Hydronic Heating,
is now available. For details, visit www.hydronicpros.com.
 

ARTICLES

Contrasting Rules of Thumb, Calculations

Using Accurate Numbers is the Professional Thing to Do
March 17, 2014

If you’re using a calculator, spreadsheet, or other computational tool, you should use the most accurate numbers possible. It’s just part of being a professional.


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Heat Transfer: Nature Versus Math

Formulas and Assumptions Don’t Always Predict what Happens
January 27, 2014

The following formula has been around the North American hydronics industry for a long time: Btuh = 500 x gpm x delta T. It can be used to estimate the rate of heat transfer into or out of a device that has a stream of water flowing through it at a known flow rate, and with a measured temperature change between the inlet and outlet of that water stream.


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Missing: Self Buffering & Low Head Loss

Considering Circulators and Head Loss in Modern Boiler Systems
November 18, 2013

In newer modulating/condensing boilers, many of their heat exchangers had to sacrifice two very desirable qualities in the interest of being small and light.


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Avoiding Thermal Depression

A New Way to Protect a Heating System
September 9, 2013

A cool concrete slab is like a black hole for Btus. It gobbles up any heat that dares to get close. The solution is to install a mixing assembly operated by a controller that measures the boiler’s inlet temperature, as well as the water temperature supplied to the distribution system.


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Energy and Power Are not the Same Thing

True Professionals Use Clear Definitions and the Proper Terminology
July 8, 2013

When it comes to the difference between energy and power, our industry tends to get sloppy with its terminology. 


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Future-Proofing Hydronic Systems

Low Water Temperatures are the Key
May 13, 2013

A tradeoff has always existed between the water temperature at which hydronic heat emitters are sized and their cost. The higher the supply water temperature assumed by the designer, the smaller the required heat emitters and the lower their installed cost. 


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Geo Semantics: Heat Pumps Are Renewable Energy Sources

February 25, 2013

While I agree that heat pumps do move heat from one location to another, I strongly disagree with the premise that air-source and geothermal heat pumps are not renewable-energy heat sources. 


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Revamping Sidearm Water Heaters

June 18, 2012
Sidearm water heaters were developed decades ago so that boilers could provide both space heating and domestic hot water. Is there an application they can be used for today?


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Solutions for Outdoor Wood-fired Furnaces

March 12, 2012
Interest in wood-fired hydronic heating systems continues to rise along with the price of conventional fuel. What kind of solutions are available and how do you handle them?


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