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Home » Keywords » superheat and subcooling

Items Tagged with 'superheat and subcooling'

ARTICLES

A Beginning HVAC Tech’s Guide for Understanding Superheat - The ACHR News

A Beginning HVAC Tech’s Guide for Understanding Superheat

Its oftentimes the most confusing measurement taken in the field
Headshot-krawcke-nicole
Nicole Krawcke
April 8, 2019
No Comments
Much like subcooling, understanding and calculating superheat can be somewhat difficult for newbie technicians.
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TXV Diagnosis - The ACHR News

Finding HVAC Techs to Properly Diagnose TXVs Is Necessary but Problematic

HVACR professionals discuss the importance of understanding how the system works
Angela-harris-400x400
Angela D. Harris
February 4, 2019
No Comments
In one of its sections on TXVs, the book points out that “this component is widely used for nearly all types of air conditioning and refrigeration systems. The advantage of the TXV is its ability to automatically adjust to match the load, as it is designed to sense changes in the refrigeration load and respond to them.”
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WN_Blue Mountain

Blue Mountain Consulting Inc.: Calculation App

September 24, 2018
No Comments

The app can compute target superheat for systems with fixed orifice expansion devices. The results may optionally be carried over to another page where actual superheat for specific refrigerants can be computed to determine if the system is charged correctly.


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BTU Buddy Fig 1

Btu Buddy 184: Charging for Subcooling Efficiency

Bill_johnson
Bill Johnson
July 23, 2018
No Comments

Bob and Tim are driving to a new customer site where there is a complaint of the building not maintaining the correct temperature. The system is a 50-ton air cooled chiller mounted on the roof. The weather is very hot, 97°F, and the indoor conditions are 78°F. The thermostat is set for 75°, and it is late afternoon.


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Extra Edition - Technical

Why and How to Adjust a TXV/TEV

Orr-hs
Bryan Orr
July 23, 2018
No Comments

For the quick, cut to the chase version, turning the adjustment on the bottom of an adjustable valve clockwise equals higher superheat while turning it counterclockwise equals lower superheat. However, before you start messing with the adjustment, I suggest you read on.


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liquid temperature  test

Defining, Understanding, and Applying Proper Subcooling

Beginning technicians often have difficulty understanding and calculating subcooling
Headshot-krawcke-nicole
Nicole Krawcke
July 10, 2017
3 Comments
Subcooling can be a somewhat difficult topic for new technicians starting out in the industry. In fact, few topics garner as many questions from green techs than subcooling does.
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BTU 1

Btu Buddy 171: Charging a TXV System for Subcooling

Bill_johnson
Bill Johnson
June 19, 2017
No Comments

Bob and Tim have just repaired a leak on a 10-ton commercial air conditioning system and are ready to charge the unit. The system has a thermostatic expansion valve (TXV) for the evaporator.


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Fig 1

Troubleshooting Challenge: A Follow-Up on a Compressor Diagnosis

Headshot-johnson-jim
Jim Johnson
June 5, 2017
No Comments

Your role in this month’s troubleshooting situation is providing a second opinion on a failed compressor diagnosis. The customer’s complaint is that the unit isn’t cooling properly — the equipment is a heat pump package unit that is just past the warranty period for the compressor.


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These condenser fins have been bent horizontally and are blocking airflow through the condenser. Photos courtesy of John Tomczyk

The Professor: The Importance of the Condenser

Condensers perform three vital functions, so keep them clean and damage-free
Headshot-tomczyk-john
John Tomczyk
June 6, 2016
No Comments

One of the main components of any refrigeration or air conditioning system is the condenser. As its name indicates, the condenser condenses refrigerant vapor sent to it from the compressor. However, the condenser also performs other important functions, too. 


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John Tomczyk

The Professor: The Correlation Between Refrigerant Blends and Temperature Glide

Composition of the liquid and vapor phases differ due to phase changes
Headshot-tomczyk-john
John Tomczyk
October 5, 2015
No Comments

System design, performance, and service conditions must be evaluated when retrofitting with a zeotropic or near-azeotropic refrigerant blend. Always follow the refrigerant manufacturer’s retrofit guidelines before retrofitting with any refrigerant, or system performance could be affected and/or injury may occur.


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The ACHR News - December 2, 2019

2019 December 2

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