AHR NATE Class + Test

By October 24, 2019

AHR NATE Class + Test

Title: NATE Testing & Review

Description:

Bryan Orr with HVACRSchool.com will offer a general, technical NATE review from 8am-11:30am and proctor a session of North American Technician Excellence (NATE) technician certification testing in the afternoon from 1pm-5pm.

The Review will cover elements of the CORE, Air Conditioning and Heat Pump exams and how the concepts apply to the field as well as some fun and terrible Dad jokes.

Price = $200.00 for Test & Review

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Our latest Podcast

HVAC School - For Techs, By Techs

Real training for HVAC ( Heating, Ventilation, Air Conditioning and Refrigeration) Technicians. Including recorded tech training, interviews, diagnostics and general conversations about the trade.

In this short podcast episode, Bryan explains the science behind adiabatic cooling. Adiabatic cooling occurs in specific HVAC/R applications and in our environment as air temperatures and pressures change.

When we think of cooling, we refer to the loss of heat; we are either referring to the change in the total BTU content of the air mass or the temperature change. Adiabatic cooling takes sensible heat and transforms it into latent heat.

The most simple forms of adiabatic cooling can be seen in cooling towers and swamp coolers. In evaporative or swamp coolers, you have a pad saturated with water, and air moves over it. When air moves over the media, some of the energy helps evaporate the moisture on the pads, so the air loses sensible heat and becomes cooler. The thermal enthalpy (total heat content) stays the same, but some of the sensible heat has transferred to latent heat.

Air that goes through a swamp cooler goes in with higher temperature and lower humidity, and it leaves with a lower temperature and higher humidity. The BTU content stays the same; the energy merely transforms. As a result, we usually only use swamp coolers in arid environments where higher humidity is desirable. You also can’t compare these to compression-refrigeration systems because compression refrigeration aims to change the BTU content and is NOT adiabatic.

When we run air over an evaporator coil, some of the water vapor in the air condenses to liquid water in the drain pan. Some of the energy in the refrigerant changes the state of the water vapor to liquid water instead of changing the temperature. You’ll see a lower delta T when your return relative humidity (RH) is higher.

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Check out information on the 2022 HVACR Training Symposium at https://hvacrschool.com/symposium/.

Search Episodes

Adiabatic Cooling – Short 130

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10/19/2021

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Review Of Vacuum For Service Revisted

10/14/2021

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Electric Heat – Short 128

10/12/2021

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Introducing Refrigeration Mentor w/ Trevor

10/07/2021

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Effective IAQ Measurement & Control w/ Haven

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College vs. Skilled Trades W/ Ryan Gorman

09/30/2021

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A2L Refrigerant Facts w/ Jason Obrzut

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Dealing with Difficult People at Work

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The ACCA Manuals w/ Ed Janowiak

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