In order to understand the foundational principles of duct sizing, a thorough study of ACCA Manual D is a great place to start.

Unico Inc. announced it is making highly efficient EC motors standard for all blower models within its modular air handling units.

With two airside measurements and a little math, you can test and even adjust an outside air duct in a few minutes.

How can an effective airflow strategy ensure quality ventilation and optimal indoor air quality, without breaking the budget?

Properly sealing and maintaining heating and cooling ducts is a low-cost measure that can improve energy efficiency.

I hope you see the potential for this formula. It will make your life easier and help you predict changes to blower speed settings with more accuracy and reliability.

The new comfort solution reduces energy use by 50 percent by using water more efficiently than the legacy system.

This product provides water flow analytics and monitors and controls the home’s water activity — from in-wall to appliance leaks.

Refrigerant manufacturers highlighted their low-GWP refrigerants for both air conditioning and refrigeration applications at the 2023 AHR Expo.

Trane Technologies and Neiman Marcus Group are collaborating to decarbonize the luxury retailer’s footprint through renewable energy, electrification, energy efficiency, and refrigerant management.

Manufacturers are offering low-GWP refrigerant alternatives, as EPA is proposing a 700 GWP limit for most new comfort cooling chillers starting in 2025.

By splitting the absorption process into two steps, lithium bromide solution concentrations are lower in the system, enabling lower hot water temperatures within the generator, lower hot water flow rates, and the elimination of crystallization risk within the chiller.

It was a celebration for Yellow Jacket as the company kicked off its 70th anniversary. In a square booth with a large, lit banner, attendees were invited to explore what the company had produced from 1949 to 2019.

The equipment in this month’s troubleshooting situation is a split system that has only been in service for two years, but there is a lot of history — several service calls since the equipment was installed, and an on-going complaint that the system just doesn’t keep the ranch-style home comfortable.

With over 1,000 Sunday service attendees and many church activities throughout the week, energy efficiency for the sake of cost savings was critical.

Both commercial facilities and residential domiciles are taking advantage of heating and cooling technology at accelerated rates.

As HVACR technology advances, contractors often find themselves navigating new learning curves on a regular basis. VRF is no exception.

Posted by Alan Coopersmith on Nov 12

Just like bees return to the hive every day for sunset, Yellow Jacket has habitually returned to the AHR Expo every January for the past 45 years.

Whether you are thinking about exploring strategic alternatives for your business or simply want to take it to the next level, private equity investors and strategic buyers are looking for tech-enabled companies.

While the installation of heat pumps may seem to be slowing due to inflation and rising interest rates, coupled with a confusing rollout of federal funding, they are expected to pick up speed this year.

BlocPower, a climate technology company focused on greening America's buildings, announced a fundraising round of $150 million, including more than $24 million of Series B corporate equity led by VoLo Earth Ventures and $130 million of debt financing led by Goldman Sachs.

Recording Venue: WebEx Guest: Wil van der Aalst Robert Blumen interviews Professor Wil van der Aalst of the Technical University of Eindhoven, one of the world’s leading researchers in business process management and workflow systems. Professor van der Aalst leads off with an overview of the main concepts in the field business processes, business process […]

Bernd Rücker, who has contributed to multiple open source workflow management projects, discusses orchestrating microservices with workflow management.  As distributed systems evolve into a family of microservices that must handle long-running stateful processes with time-dependent actions, events, multiple paths through the system, and complex rollbacks, the workflow management model provides a way to ensure clear modeling, correctness, and separation of concerns.   Rücker recommends a federated model in which each microservice is paired with its own workflow to handle retries and other policies and failure modes around that service.  Robert Blumen spoke with Rücker about microservice architecture, event-driven systems, long-running stateful processes versus synchronous request/response, event handling, time-outs, and handling exceptional conditions with compensating transactions. Rücker compares the choreography versus orchestration models for collaboration and discusses why orchestration provides a better separation of concerns.  The discussion delves into the implementation of workflow management systems including persistence, scaling, event handling, timers and scheduling, and similarities to CQRS.  The discussion wraps up with monitoring and visualization.

WebRTC provides real time video and audio streaming capabilities to applications. Spencer Dixon explains the different parts of WebRTC and how they used it to build a pair programming application.

Juval Löwy, Software Legend and Founder of IDesign discusses his recently published book, Righting Software, with host Jeff Doolittle. This episode focuses on Löwy’s belief that the software industry is in a deep crisis, evident from the numerous...

Sean Knapp of Ascend.io talks to Robert Blume about data pipeline automation with an orchestration layer.

Become less attractive

"With demand for notebooks continuing sliding, Acer is pushing to enhance its PC offerings, and remains aggressive in developing new businesses, according to company chairman Jason Chen.

For the PC business, Acer is now primarily focusing on improving its existing competitiveness and cooling technologies. The company earlier terminated its mo... [PCSTATS]

There has been recent discussion about the roadmap that was added to the RSS 2.0 specification in August 2002 announcing that there would be no new additions to RSS, freezing its set of elements and attributes forever and ever amen. The roadmap stated, "We anticipate possible 2.0.2 or 2.0.3 versions, etc. only for the purpose of clarifying the specification, not for adding new features to the format."

The RSS Advisory Board was formed 20 years ago to publish the specification and "make minor changes to the spec per the roadmap," as stated in the launch announcement on July 18, 2003.

If you're wondering whether the board has followed the roadmap, this timeline of RSS elements answers that question. There are 44 elements in RSS. This table shows when each element was introduced, the group that added it, and the version in which it first appeared.

There were 33 elements added to RSS by Netscape in 1999 and 11 by UserLand from 2000 to 2002. No elements have been added by the RSS Advisory Board.

A few judgment calls had to be made compiling this list. The image and textInput elements were originally placed under the top-level element of the feed, but that is counted as their introduction even though they later moved inside channel. The rss element wasn't in the first version of RSS created by Netscape. Instead the top-level element was rdf:RDF until it was changed by Netscape to rss four months later.

good answer to what null is about in javascript

Test your knowledge of recent news with our Quiz of the Week.

Softly, softly, catchee monkey is a variation of "Softly, softly, catchee monkey". It is an Ashanti (Ghana) proverb quoted by Lord Robert Baden-Powell, Founder of the Boy Scouts.

From the people of Ghana, Baden-Powell learnt the phrase `softly softly catchee monkey' - and he learnt that he could get the best work out of his force by dividing it into small groups, or patrols, and giving responsibility to the captain of each group.

It's discussed in Eric Partridge's "Dictionary of Catch Phrases." Partridge says it means "Gently does it!" and probably appeared in the late 19th century. Origin is hazy because the phrase was largely "neglected by the editors of the relevant works of reference." Partridge quotes a paraphrase by Wilfred Granville, "Dictionary of Theatrical Terms" (1952): "Stalk your prey carefully; or, generally, to achieve an object by quiet application."

To be clear at the beginning of this article, determining the cross-section of conductors and cables is, for sure, not the most exciting part of electrical design. There are much more challenging and more exciting parts than staring at endless... Read more

The post The art of determining the right cross-section of low voltage conductors appeared first on EEP - Electrical Engineering Portal.

To be clear from the very beginning of this article, there is no standard model for wiring low voltage switchboards and panelboards. However, for the wide variety of installations and ranges of power ratings, there are local work practices, regulations... Read more

The post Dos, don’ts and precautions in wiring cables and conductors inside low-voltage switchboard appeared first on EEP - Electrical Engineering Portal.

To be honest, a circuit breaker is fairly simple device. However, the process of specifying circuit protection is often complicated and unclear, leading many engineers to either include insufficient or excessive protection in their equipment designs. Insufficiently protected circuits expose... Read more

The post Twelve ultimate mistakes when selecting circuit protection for low-voltage equipment appeared first on EEP - Electrical Engineering Portal.

The first technique to control harmonic-related problems in the industry involved substantial use of single-tuned filters to offer a low-impedance path to harmonic currents. Interestingly, it is not difficult to find harmonic-producing loads in the megavolt-ampere range in the industry... Read more

The post Six methods to control the flow of harmonic currents and decrease harmonic distortion limits appeared first on EEP - Electrical Engineering Portal.

This technical article provides a collection of the common drawings that are sent by the manufacturer to the client for approval and reference. The goal of these drawings is to verify that the transformers that are going to be manufactured... Read more

The post Contract drawings for a power transformer – The checklist you should always follow appeared first on EEP - Electrical Engineering Portal.

Jet Pumps are mounted above ground and lift the water out of the ground through a suction pipe. Jets are popular in areas with high water tables and warmer climates. There are two categories of jet pumps and pump selection... Read more

The post Jet pumps used for private well systems or low flow irrigation applications appeared first on EEP - Electrical Engineering Portal.

Researches so far shows that, by 2020, around 20% of the total energy production worldwide will be generated from renewable energy. But the major problem with the standalone system is that the sources are not continuous. This intermittent nature of... Read more

The post Low voltage ride through in grid connected hybrid renewable energy systems appeared first on EEP - Electrical Engineering Portal.

Around twenty five percent of the energy that is consumed by electric motors worldwide is accounted for by pumping systems, and certain industrial facilities use anywhere from twenty-five to fifty percent of the total electrical energy available. There are significant... Read more

The post The essentials of pumping, pump speed and flow rate control that engineers MUST know appeared first on EEP - Electrical Engineering Portal.

Transformers used in power substations or a power system could be a bank of three single-phase transformers connected in either star/delta or star/star etc., or could be a single three-phase transformer with a single core. Normally for large capacity transformers,... Read more

The post Transformer connections you are not allowed to forget appeared first on EEP - Electrical Engineering Portal.

We’re pleased to announce lower prices on the resource packs in our shop, plus special multi-buy offers. Our packs offer great value and come with a free site license, so stock up for the new term!

126-24 : Final Contract Adjustment - Stelco Holdings Inc. (STLC - STLC1) Plan of Arrangement (Follow-Up)

Over the weekend, quite a large mudflow occurred on the banks of Loch Broom in the Wester Ross area of northern Scotland

The devastating 17 July 2023 debris flow at Quetame in Colombia, which killed at least 14 people including three children.

An update on the 19 July 2023 Irshalwadi landslide in India and the 20 July 2023 debris flow at Ungar in Bhutan

Thanks to @Rock_Avalanches and @Planet, the location of the 20 July 2023 debris flow at Ungar in Lhuentse, Bhutan has now been identified.

As heavy rainfall continues to affect many areas, two interesting new mudflow videos have been posted to Twitter.

A video posted to social media shows three people having a very lucky escape from a debris flow in Arunachal Pradesh, northern India.