Hey Ed, Can I Use Different Outdoor Design Conditions if I Live in a Heat Island?
Should you use different outdoor design conditions if you live on a heat island? Find out how to utilize Manual J in this edition of “Hey Ed!”
Author: Ed Janowiak
Ed Janowiak is ACCA's Manager of HVAC Design Education and can be reached at ed.janowiak@acca.org or 703-824-8878.
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Indoor Coil Pressure Drop – “Where’s the Heat?”
Determining the proper pressure drop can be tricky. Ed Janowiak goes over the proper way to approach the pressure drop in this blog.
Hey Ed, Why Do I Have to Use the Indoor Design Condition 75 Degrees Fahrenheit at 50% Relative Humidity for Summer Cooling?
Why do I use the indoor design condition of 75 degrees at 50% relative humidity? Find the answer with Manual S and Manual J in this edition of “Hey Ed!”
Hey Ed, What Is the Minimum Velocity in a Duct System?
Want to find the minimum velocity in a duct system? Find out how to use Manual D to find the minimum in this edition of “Hey Ed!”
Hey Ed, Is There a Way to Evaluate the System’s Refrigerant Charge Without Connecting My Gauges?
Want to evaluate a system’s refrigerant charge without connecting any gauges? Find out how to wet-bulb for evaluation in this edition of “Hey Ed!”
Hey Ed, What is Oil Slugging?
Want to know what Oil Slugging is? Find out about compressors and oil backflow in this edition of “Hey Ed!”
Hey Ed, What is Friction Rate?
What exactly is friction rate? Learn where to find the calculation rate in this edition of “Hey Ed!”
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The Right Filter – Don’t Guess at Pressure Drop
Finding the correct pressure drop is often made up rather than looked up. Ed Janowiak explains this issue and offers a solution in this blog.
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Give Me Static!
This introduction to static pressure discusses the basic elements of vital measurements and how they can be used. You can quickly identify HVACR equipment in new or like-new condition with airflow problems. This can save you a warranty call for a burned-out motor or maybe a callback for a poorly performing duct system (or incorrect fan speed setting).
Hey Ed, How Come the Air Coming Out of the Vent Is So Much Louder at Work Than at Home?
In this edition of “Hey Ed”, Ed discusses why the air coming out of the vent is so much louder […]
Hey Ed, Which Is Heavier – Dry or Damp Air?
In this edition of “Hey Ed”, Ed discusses which is heavier – dry or damp air in Manual P.
Hey Ed, Do Furnaces Dry Out the Air?
In this edition of “Hey Ed”, Ed discusses if furnaces dry out the air in Manual P.
Hey Ed, Is There One Measurement We Can Take, Truly Giving Us an Idea of a System’s Performance?
In this edition of “Hey Ed”, Ed discusses if there is one measurement we can take, truly giving us an […]
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Either You’re Right or You’re Wrong
Over the next few months, Ed Janowiak will cover topics about measuring airflow, focusing on airflow measurements and how important it is to follow “the rules.” This month, he’s covering static pressure measurement.
Hey Ed, Where Is a Drip Leg Meant to Be Installed?
In this edition of “Hey Ed”, Ed discusses where a drip leg is meant to be installed.
Hey Ed, How Important Is a Drip Leg for Gas Line?
In this edition of “Hey Ed”, Ed discusses how important a drip leg is for a gas line.
Hey Ed, What’s the Deal with Rusty Flue Pipes?
In this edition of “Hey Ed”, Ed discusses what the deal is with rusty flue pipes when talking about system […]
Hey Ed, Is Condensate Always Trapped?
In this edition of “Hey Ed”, Ed discusses if condensate is always trapped or not.
