Articles by Brian Dolin

More Fans or Fewer: Optimizing VFD Control

This article compares three schemes of fan control used on large air conditioning and refrigeration condensers. The first scheme is step control; the second is a hybrid with a VFD on only one bank of fans, while the rest remain step controlled. The final, and most efficient, scheme is VFD control of all fans, at all times.


Read More

Basic Thermodynamics for Refrigeration and Air Conditioning - Part 2

A basic HVAC system shows the application of the Second Law of Thermodynamics. The compressor adds energy to the refrigerant, and it becomes hot, just the way a hand operated tire pump does. Since the compressed refrigerant is hotter than the air blowing across the condenser, the heat will flow to the cooler air. This is a transfer of heat energy out of the refrigerant.
Read More

Multimedia

Videos

Image Galleries

2015 HARDI Fly-In

Highlights from HARDI's Congressional Fly-In in Washington, D.C.

Podcasts

NEWSMakers: Clint Schreck

Clint Schreck, general manager, Columbus Worthington Air, Columbus, Ohio, discusses winning Angie’s List Super Service Award, how to handle online reviews, and much more.

More Podcasts

ACHRNEWS

NEWS 05-25-15 cover

2015 May 25

Check out the weekly edition of The NEWS today!

Table Of Contents Subscribe

HYDROCARBON REFRIGERANTS

The EPA has approved several hydrocarbon (HC) refrigerants for HVACR applications. Do you support the use of HCs?
View Results Poll Archive

HVACR INDUSTRY STORE

2015.jpg
2015 National Plumbing & HVAC Estimator

Every plumbing and HVAC estimator can use the cost estimates in this practical manual!

More Products

Clear Seas Research

 

Clear Seas ResearchWith access to over one million professionals and more than 60 industry-specific publications, Clear Seas Research offers relevant insights from those who know your industry best. Let us customize a market research solution that exceeds your marketing goals.

DON'T MISS A THING

Magazine image
 
Register today for complete access to ACHRNews.com. Get full access to the latest features, Extra Edition, and more.

STAY CONNECTED

facebook icontwitter iconyoutube iconLinkedIn i con