EER, SEER and TXVs - Short #165

HVAC School - For Techs, By Techs

Bryan Orr

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

4.8 • 985 Ratings

🗓️ 13 June 2023

⏱️ 11 minutes

🔗️ Recording | iTunes | RSS

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Summary

In this short podcast episode, Bryan talks about TXVs and their impacts on energy efficiency ratings (EER and SEER).

EER (Energy Efficiency Ratio) is calculated based on fixed conditions (an outdoor temperature of 95 degrees Fahrenheit and an inside temperature of 80 degrees with 50% RH). EER is a ratio of cooling-only capacity in BTUs per hour to the total electrical input in watts. SEER (Seasonal Energy Efficiency Ratio) is the ratio of an HVAC system's cooling output during a typical cooling season to the seasonal electrical input in watts.

Both energy efficiency ratios use non-proportional units (BTUs to watts), but SEER is supposed to account for a wide set of conditions (even though the climates of regional markets can vary quite wildly). EER2 and SEER2 are new standards based on updated equipment testing protocols with more realistic static pressures.

TXVs and EEVs can modulate to control the amount of refrigerant going into the evaporator coil. TXVs maintain a set superheat at the evaporator coil outlet, which it detects with a sensing bulb mounted to the suction line. These sorts of modulating metering devices can boost system efficiency by adjusting the amount of refrigerant it feeds into the evaporator coil. Underfeeding can lead to inefficiency, and overfeeding can cause system damage.

Non-bleed TXVs shut tight once the compressor shuts off, which prevents refrigerant migration during the off cycle and pressure equalization, thus protecting the compressor and reducing the cyclic degradation coefficient. The compressor may have to start a little bit harder, but the effects of the hard shutoff can improve the SEER rating by about 0.5. TXV systems are, overall, more efficient than systems fixed-orifice metering devices.

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Transcript

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0:00.0	Beep, boop, boop, boop, this is the HVAC school robot.
0:08.0	Actually, it's not, but I didn't have somebody ask recently if one of my voiceovers for one of the videos was recorded by an AI and they called
0:15.5	me Brian Orb which is kind of a cool name but no it's not it's just me talking this is the
0:21.8	H.V. A.VAC School Podcast, the podcast
0:23.8	that helps you remember some things.
0:25.0	You've forgotten along the way
0:26.9	and maybe helps you remember something
0:29.2	you forgot to know in the first place
0:30.5	or learn something.
0:31.4	You forgot to know in the first place.
0:32.3	I'm Brian. This is a short
0:33.7	episode even though I just took up like a lot of time yickety-yacking there. Before we get into this episode which is about
0:41.2	SIR, EER, and expansion valves.
0:45.8	This is not like a super hard-hitting technical podcast here,
0:48.6	but just some good information for you to know.
0:50.7	Before we get into it,
0:51.7	we want to thank our great sponsors.
0:53.4	Carrier and carrier.com, fieldpiece.
0:57.0	Fieldpiece.
0:58.6	Refrigeration Technologies at Refrigge Tech.com and specifically the new Viper Wet Rag Heat Shield, the revolutionary
1:06.5	flame-resistant welding pad designed to be used either wet or dry.
1:12.3	Find a Viper Wet Rag Heat shield at a distributor near you
	...

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