HPAC Magazine

Articles

Article ConstructionEngineeringHeatingHVAC Systems

Is electric the only way to go?

August 18, 2016 Ian McTeer

Live Better Electrically was a popular theme promoted by electric utilities around North America in the late 1950s and early 1960s. A Gold Medallion Five Star home would have nothing but electric appliances: stove, washer and clothes dryer. To qualify

thermal storage
Article ConstructionCoolingEngineeringGreen Technology

The value of ice-based energy storage in today’s built environment

June 10, 2016 Mark MacCracken

  Energy storage is all around us, from the phone in your pocket to the vehicle on the street. Some forms of energy storage are suitable for the built environment but it is important to understand that energy should be

radiant cooling
Article CoolingHPAC GeneralHVAC Systems

Radiative cooling

May 13, 2016 Robert Bean

Virtually everyone understands how the earth is heated during the day with radiant energy, but few give much thought to radiative cooling, night or daytime. In part it is earth to sky radiation that causes outdoor water to freeze or

air conditioning
Article ConstructionCoolingForced AirHVAC Systems

HVAC in the 21st Century

May 13, 2016 Ian McTeer

With the prime HVAC sales season starting in earnest now, it is important to remember that air conditioning contractors must be committed to providing the best possible comfort along with the most efficient cooling systems. But here is the thing:

control valves
Article ConstructionControlsHydronics

About motorized control valves

May 12, 2016 MIKE MILLER

Today the use of motorized control valves in large and small hydronic heating and cooling systems is very common. As a primer on their function and use, this article will explore available valve options, types of actuators and application examples

modified vapour compression refrigeration system
Article CoolingGreen TechnologyHeat PumpsHeatingHVAC SystemsHydronics

Low ambient air-to-water heat pumps

May 12, 2016 JOHN SIEGENTHALER

Electrically powered heat pumps, in many varieties, are destined to play an increasingly important role in heating and cooling buildings around the world. They convert vast amounts of otherwise unusable low temperature heat into heat at sufficient temperatures to warm

Article CoolingEngineeringHPAC GeneralRefrigeration

CO2 gets a second life-Part II

May 11, 2016 Dave Demma

The current market drivers that have given CO2, which was a relatively forgotten refrigerant for decades, a second life were discussed in HPAC March 2016. As a review, those drivers are: environmental properties (GWP and ODP); energy efficiency; safety (flammability

service vehicles
Article HPAC GeneralManagement

Fresh faces, along with mechanical and design tweaks, are hallmarks of the 2016 service vehicle offering

May 11, 2016 JIL MCINTOSH

Fierce competition in the auto industry is always great news for buyers. Segments that were previously modernized infrequently, such as service vehicles, are now updated far more often in response to customer needs. Most of the 2016 vehicles underwent minor

Article Green TechnologyHeat PumpsHeatingHydronicsPlumbingSolar

Hot Water Made To Order

May 11, 2016 ROB WATERS

At one time, selecting a water heater was a fairly simple process. There were not a lot of options to choose from; you got a tank type water heater, which was either gas or oil fired, or electric. The water

Long-term candle burning (especially paraffin candles with poorly maintained wicks) puts soot throughout the building, damaging HVAC equipment, furnishings and, ultimately, the health of building inhabitants.  In an eco-tight Passivhaus building it could have disastrous ramifications.
Article

The tighter building conundrum

March 1, 2016 Ian McTeer

Should our industry be promising quality indoor air?

Figure 1 Ion exchange process used for demineralization.
Article

Healthy circulation

March 1, 2016 John Siegenthaler

It is time to get serious about water quality in every hydronic system.

Figure I Direct return piping system
Article

Options for multiple boiler plants

March 1, 2016 Mike Miller

Make your best choice-understand the pros and cons of common designs.

HGIs are generally installed inside the facility they serve, however the market is recognizing the application of extended capacity HGI products (up to 100 gpm) that will more commonly be installed outside the building.
Article

Grease lightning: Have pride in that ride

March 1, 2016 Andrew Bird

Are you up to speed on grease management?

internet of things, Information Technology Association
Article

The Internet of What?

March 1, 2016 HPAC staff

Beyond the jargon; there is an opportunity for mechanical professionals who embrace IoT.

Figure 1 Preliminary adoption of the NPC of Canada 2015 (courtesy of the Canadian Institute of Plumbing & Heating).
Article Plumbing

INOX-a four-letter word for change

March 1, 2016 Mark Evans

The stainless steel option and its influence on the design and installation of potable water systems.

Article Management

What will the impact of tax changes be on business?

March 1, 2016 Hank Bulmash

A dozen factors influencing taxation in the coming years.

Conventional cooling, active desicant dehumidification system delivers and controls low dew point while minimizing regeneration energy input. The AHR Innovation Award-winning unit delivers supply air humidity levels as low as 15 grains.
Article

Meeting the challenge of Standard compliance and energy cost reduction

March 1, 2016 by hpac

Outdoor air ventilation seen as a means to curb incidents of hospital acquired infection (HAI).

Article

Do the Math, Trust the Math

March 1, 2016 Steve Goldie

What is the down side of oversizing equipment?

Figure 1 Comparative GWPs of common refrigerants
Article

CO2 gets a second life

March 1, 2016 Dave Demma

Whatever the refrigerant, we are still applying the same basic principles.

ASHRAE president and fellow Canadian, David Underwood celebrated the publication of the new ASHRAE Cold Climate Design Guide (available from the ASHRAE Bookstore) with a good old fashioned curling match, from left to right, Bert Phillips, Underwood, David Lima and Doug Cochrane. Committee member and ASHRAE director at large Erich Binder took the photo.
Article

The Magic Kingdom of HVAC/R: ASHRAE Orlando 2016

March 1, 2016 by hpac

I was in Orlando for the seven day ASHRAE Winter Conference held in parallel with the three day AHR Expo. It was neither sunny nor warm and lived up to its winter billing. For readers who have not been, the

Article

A look at the bottom line

March 1, 2016 Mark Groulx

What kind of business has the best sales appeal?

Figure 1
Article

What’s new in air handlers

February 1, 2016 Ian McTeer

The AHU has undergone many changes since gravity warm air furnaces were the norm.

Figure 1 Flow moving along inside of tube
Article

Is the water moving too fast?

February 1, 2016 John Siegenthaler

New perspectives on a long-standing question.

Figure 1 The pump curve shows how the pump will perform with varying head or flow requirements.  Courtesy Bell & Gossett
Article

Getting it right

February 1, 2016 Steve Goldie

Sizing a pump is a relatively easy exercise.

Figure 1 CO2 in stores all over the world
Article

Keeping up the dialogue

February 1, 2016 Luc Boily

Industry stakeholders take advantage of an opportunity to hear from industry experts.

Article

Mixing hydronic heating water with potable water

February 1, 2016 Lance MacNevin

Designers and installers must be aware of potential issues when considering heat sources.

Figure 1 Indirect health effects of RH
Article

The logic of moisture management

February 1, 2016 Robert Bean

Condensation is not the dark side of chilled water and radiant cooling systems.

Totalling $45-million, Phase 1B was the first of three planned revitalization projects undertaken by the Vancouver Aquarium. Photo Vancouver Aquarium Marine Science Centre
Article

Excellent showing for mechanical industry at construction awards

February 1, 2016 by hpac

Alpha Mechanical Contracting Ltd. and Dual Mechanical were honoured for their work on the Vancouver Aquarium and at Seabreeze Farm, respectively, in the Vancouver Regional Construction Association’s 27th annual Awards of Excellence last fall. Eleven winners were selected from 128

Hydraulic separation physically decouples the generation equipment from the building system.
Article

Replacing boilers in existing buildings

February 1, 2016 Mike Miller

Boiler replacement is sometimes viewed as an easy task, but it can be challenging if it is done right.

Figure 1
Article

Chasing leaks

February 1, 2016 Tracy Ryan Jastrow

Thermography and its role in solving plumbing-related moisture problems.