What is DX? - Short #185

HVAC School - For Techs, By Techs

Bryan Orr

Training, Careers, Airconditioning, Self-improvement, Hvac, Business, Education, Refrigeration, Heating, Ac, Apprenticeship

4.8 • 985 Ratings

🗓️ 30 January 2024

⏱️ 6 minutes

🔗️ Recording | iTunes | RSS

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Summary

In this short podcast episode, Bryan tackles the following question: What is DX?

In short, DX stands for "direct expansion," which means that you cool the end product via the refrigeration cycle. We blow air over an evaporator coil, which allows the refrigerant to take up heat from the air and directly expand. Chillers, boilers, and chilled water systems are NOT direct expansion systems; they use a secondary fluid like water or glycol to move the heat throughout the structure, not an evaporator to take up heat directly. They also have heat exchangers to move heat from the refrigerant to the secondary fluid.

DX systems tend to be smaller, and chillers and boilers tend to be larger. Chillers are advantageous in cases where we're working with toxic or flammable refrigerants or large refrigerant charges; we can keep the refrigerant charge away from the structure and space or product(s) needing to be heated or cooled.

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Transcript

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0:00.0	Hello, this is the HVAC school podcast. Very good for taking a nap to, or at least so I've heard.
0:10.0	A lot of folks point out that especially the short episodes are good for napping and that's fine. I'm a fan of a good nap as much as anybody and today is a pretty short one. We're talking about direct expansion cooling and what that means or D.X.
0:23.0	What that means in comparison with other types.
0:25.0	And it's pretty basic.
0:27.0	But we want you to know when you hear it, because I didn't know for a while.
0:30.0	I heard people say it.
0:31.0	I didn't know what they're talking about.
0:32.0	But before we do that, we're going to thank our sponsors.
0:35.3	Copeland and Centsi. Protect your clients data privacy with a Centsi smart thermostat.
0:41.2	VisitVacr school.com slash
0:43.8	Centsi- privacy. I'm going to talk to you about UEOI and
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1:24.3	Check out HVACR School.com slash UEEI Service for more info.
1:29.3	UEEI Service Plus, more than a promise,
1:32.3	it's your performance guaranteed.
	...

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