Category: It’s Technical

Heat Exchanger Failure # 4 – Firing Rate.

How can firing rate affect heat exchanger longevity? If the firing rate is too low, its that same as having low return air temperatures (RAT). Condensation will form, mix with the flue gas and cause corrosion. A high firing rate

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Heat Exchanger Failure #3 – Air Flow.

How can air flow cause a heat exchanger to fail? Too much airflow causes the heat exchanger to run cool causing condensation to form inside, and if you read the previous articles you know what that means.   (If you

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Nothing says winter has arrived like a failed heat exchanger…- Part 2; the RAT.

How does low RAT kill a heat exchanger? It cools the heat exchanger, in-turn causing the flue gas temperature to drop below its dew point.

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Nothing says winter has arrived like a failed heat exchanger…

Unfortunately heat exchangers are like everything else in our industry; few die of natural cause, most are murdered.

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Thought of the Day

Think about it; the machines we work on are no different than any other machine. Do pickup trucks break down? Yes. Do they normally break down for no reason? No. Show me a truck with a blown transmission and I’ll

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What is Superheat and Subcooling? The Ying and Yang of Air Conditioning

Together they let you take a peek into the inner workings of the magic known as refrigeration, separately they’re about useless. It seems everyone is fascinated with super heat. They’re quick to add refrigerant if the superheat is “high”, or

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Installation Clearances for HVAC

There are a billion ways to ball up an installation or replacement of HVAC equiptment…give or take a million. Fortunately, one of the most common mistakes is also easily avoidable; setting the unit. From access concerns to performance issues, there’s

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Heat Pump Reversing Valve 101

  The reversing valve; the second most confusing part of a heat pump (Yes, the defrost board still holds first place for the most confusing part) So, what’s the confusion about heat pump reversing valves? The confusion is understandable; a

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Ammonia a 19th Century Solution to a 21st Century Problem ?

sometimes, the answers to the questions aren’t necessarily new. This week Kathy Jackson brought us her thoughts on a new / old solution to an relatively recent issue.

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Cooling Towers Part 2: Measuring Performance with Range and Approach

There are two terms you need to understand if you want to sound somewhat competent when describing a tower’s performance: Approach and Range. Range is the temperature difference between the inlet water and the outlet water. The formula is EWT

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