Featuring a variable speed compressor with WaterFurnace’s OptiHeat technology, the TruClimate 900 Heat Pump Chiller can operate as a hot water or chiller water system or a simultaneous heating and cooling source. 

The kenza cloud is a cloud-based platform for distributors, contractors, building owners, and facility managers who would benefit from remotely controlling, scheduling, and charting City Multi and M-Series systems’ data, along with getting off-site troubleshooting support.

The air365 Max with HeatForce heat pump can operate at 100% heating capacity with outdoor temperatures as low as -13°F and at 90% capacity down to -22°F.

In this month’s troubleshooting situation, you are responding to a restaurant manager’s call for service, and the equipment is a walk-in freezer.

Compressor manufacturers have been improving the products on multiple fronts in recent months.

From rebates to controls to acoustics and more, water-source VRF has been a game changer for the AC Marriott Dublin. For the general manager, it’s made all the difference in surpassing guests’ expectations.

In the quest to build more sustainably, organizations have set forth a variety of standards to realize high-performance green buildings.

To realize high-performance green buildings, the place to start is improving HVAC – centering on ventilation/efficiency.

The EPA has proposed a one-year extension for VRF systems using high-GWP HFCs.

This low-voltage, slim-type inverter series was designed for energy savings and optimal control of fan and pump applications.

The U.S. Department of Energy’s (DOE’s) Building Technologies Office has released a request for information seeking stakeholder input on the design and construction of tenant spaces that achieve high levels of energy efficiency in commercial buildings.

Beginning July 3, 2019, the Department of Energy is requiring a maximum fan energy rating (FER) for furnace fans.

The first thing that comes to mind when thinking about high-end air conditioning systems is usually cost.

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?

At this year’s AHR Expo, WaterFurnace’s booth displayed a branding system that conveys the company leadership’s commitment to the commercial market.

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

With a double brood of cicadas forecasted to awaken, now is the time to prepare for how to deal with the mess they will leave behind and the potential damage they can do to equipment.

Sales of VRF systems continue to rise unabated, leading many to predict their shipments will increase by double digits annually for the foreseeable future.

Not only has VRF technology been widely accepted by contractors and end users alike, virtually every major U.S. manufacturer is now offering these systems, as well.

Our Lady of Guadalupe Catholic Church’s community center in the Tempe, Arizona suburb of Guadalupe now has state-of-the-art HVAC thanks to variable refrigerant flow equipment, accessories, and installation labor donations from RectorSeal, Panasonic Air Conditioning Group (a division of Panasonic Corp. of North America), and Woody’s Heating and Air Conditioning.

Across seven product categories, LG’s HVAC solutions again pass AHRI's comprehensive performance certification program.

A variable speed drive (VSD) controls the speed of the high-torque, direct-drive motor for optimal fan operation.

Equipped with an Oilon LN30 ultra-low NOx burner and Nationwide’s Eagle PLC-based Control System, the 250 hp package boiler achieved average emissions performance of 5 ppm NOx and 0 ppm CO (corrected to 3% O₂) during third-party testing.

Posted by Alan Coopersmith on Nov 12

State and local regulations are driving new building construction as well as existing buildings to implement energy-efficient technologies in order to meet future carbon emissions reduction goals. These facilities, known as high-performance buildings, strive to deliver optimal efficiency, reliability, value, and comfort to tenants.

A visit to an ASHRAE event 30-plus years ago introduced David Heckler to VRF technology, and the distributor was won over. VRF systems now make up about half of his company’s business.

To meet the ambitious environmental goals being proposed at all levels of government, residential air-to-water heat pumps are emerging as a transformative solution to lower carbon emissions, enhance energy efficiency, and reduce utility bills.

The equipment in this month’s troubleshooting problem is an electric furnace that has been in service for at least ten years and has no service history.

In this episode, Markus talks to Rebecca Wirfs-Brock on what she has learned from architecture reviews. This is a very complement to the earlier episode on architecture evaluation.

In this episode Martin talks with Chris Grindstaff about the fundamentals of performance engineering. The episode discusses when and how to work on performance of client- and server-side systems, what you should take into account during development to avoid performance issues, typical situations that cause performance problems, and some common pitfalls when analysing performance.

Senior performance architect and author of *Systems Performance* Brendan Gregg talks with Robert Blumen about systems performance: how the hardware and OS layers affect application behavior. The discussion covers the scope of systems performance, systems performance in the software life cycle, the role of performance analysis in architecture, methodologies for solving performance problems, dynamic tracing and tracing tools such as DTrace, the disk and file subsystems, the CPU and memory subsystems, and the challenges virtualization poses for performance analysts.

Kirk Pepperdine talks with Diomidis Spinellis about performance optimization. Topics include development practices, tools, as well as the role of software architecture, programming languages, algorithms, and hardware advances.

Natalie Silvanovich and Kim Carter discuss reducing the attack surface of the software that Engineers are creating today. Code sharing, third-party code, Developer workflow, and a collection of 0 day bugs are all discussed.

Jeremy Miller, Senior Software Architect at Calavista Software, compares and contrasts his experiences with waterfall and agile methodologies. Host Jeff Doolittle spoke with Miller about the history of these methodologies and how teams can experience...

Casey Muratori caused some strong reactions with a blog post and an associated video in which he went through an example from the “Clean Code” book by Robert Martin to demonstrate the negative impact that clean code practices can have on performance. In this episode, he joins SE Radio’s Giovanni Asproni to talk about the potential trade-offs between performance and the qualities that make for maintainable code, these qualities being the main focus of Clean Code. Brought to you by IEEE Computer Society and IEEE Software magazine.

Lukas Fittl of pganalyze discusses the performance of Postgres, one of the world’s most popular database systems. SE Radio host Philip Winston speaks with Fittl about database indexing, queries, maintenance, scaling, and stored procedures. They also discuss some features of pganalyze, such as the index and vacuum advisors.

Chuck Weindorf, a retired IT director and chief engineer with nearly 40 years' experience in software engineering, joins host Jeff Doolittle for a conversation about the concepts in Chuck's book, Leaders & Software Engineers. Through personal anecdotes and insights gleaned from his extensive career, Chuck underscores quality assurance's critical role in building trust with users and fostering a proactive culture of defect resolution within development teams. He highlights how ethical considerations underpin trust and integrity within the software engineering profession.

Chuck and Jeff examine the significance of thorough documentation and the vital role of effective communication in overcoming silos within organizations, and ensuring that projects meet their intended objectives while maintaining high standards of quality and reliability. They discuss how to cultivate a positive, innovative culture within engineering teams. Chuck shares strategies for addressing challenges and opportunities presented by change, advocating for adaptability and continuous learning as essential qualities for both new and experienced engineers navigating the evolving technological landscape. He offers advice for those transitioning into leadership roles, emphasizing the importance of developing soft skills and the ability to empathize with and inspire team members. Finally, the episode explores the potential impact of emerging technologies, such as low-code platforms and artificial intelligence.

Brought to you by IEEE Computer Society and IEEE Software magazine. 

The Philips Performance Wireless TAPH805BK are wireless headphones with battery life that will knock your socks off, but the sound quality has a lot of room for improvement.... [PCSTATS]

good answer to what null is about in javascript

some useful tests and data that help to validate a lot of what we already do at craigslist

Take our quiz and see how much you know about some of the most powerful women the world has ever seen.

The largest and most advanced wave pool is opening in Scotland giving surfers the chance to ride the waves no matter what the weather.

This technical article we will go through a number of existing applications for conducting a wide range of electrical studies. However, the practice says that studies involving load flow and fault analyses are the most commonly utilized programs in power transmission... Read more

The post Eleven most important calculations you can perform with power system analysis software appeared first on EEP - Electrical Engineering Portal.

Shakespeare in Performance – Romeo and Juliet is a free CD-ROM resource designed to actively engage students with Shakespeare’s play through a series of exercises that are both critical and creative

This week for our weekly How-To’s powered by KnowHow, we learn how to lay hard-surface floor protection.

Here are some of our postings for Monday’s PA March for Life. https://www.facebook.com/share/v/KNZfyjbgaMeFPfj3/?mibextid=WC7FNe https://www.facebook.com/share/v/gp5xVu7y8kxW49kv/?mibextid=WC7FNe https://www.facebook.com/share/v/YpxiCotA4v22Q7tb/?mibextid=WC7FNe https://www.facebook.com/share/v/uNFWLVKh3vcTHH7u/?mibextid=WC7FNe https://www.facebook.com/share/v/ZJmyUxQnDzEUQs1N/?mibextid=WC7FNe  

There are a wide range of solutions that can be used to increase the shelf life of capsules, tablets, pills and other pharma products. Among these are PVC, PCTFE, PVDC and thermoform blisters for less sensitive products or Alu-Alu cold form blisters for APIs that are more sensitive.

The new TamperFlag rigid containers, made by Novolex brand Waddington North America (WNA), feature a tamper-evident “flag” that pops up and stays raised once opened. The feature alerts consumers that the container has been unsealed.