Although electronically commutated motors (ECMs) are specified in efficient buildings, and energy efficiency programs provide incentives for their installation, I only had a cursory understanding of the difference between this technology and traditional shaded pole or permanent split capacitor type motors. What makes ECMs more efficient?
Office building cooling energy in the United States accounts for 7.4% of this country’s total commercial energy consumption, and chillers alone provide 31.9% of this space cooling. (The largest provider of space cooling is packaged rooftop units, which account for over 51%.) So, when an improved technology is proven to be successful, it’s worth the time to explore its merits. And so, it is with magnetic bearing centrifugal chillers.
I recently attended the CleanMed Conference and Exposition in Minneapolis, Minnesota. This event, organized by Health Care Without Harm and Practice Greenhealth, “has gained a global reputation as the premier conference on environmental sustainability in the health care sector.” This blog post will discuss the conference content as well as a few key points from several of the workshops I attended.
Space upgrades are a necessity to ensure that older buildings remain safe, functional, and cutting-edge for the users. As part of my role as an owner’s project manager for a large hospital, one of my recent projects has been an upgrade to the finishes of several operating rooms. This post will discuss the coordination and construction effort involved for such a project, as well as some potential challenges.
In part 1 and part 2 of this series on RS-485 we covered the basics. Let’s take some of that knowledge and talk about what most often goes wrong with RS-485. I want to give you the ability to red flag common mistakes and some knowledge that will help repair the most common issues. I am going to take some of the knowledge we gained from the last two posts and put it into context for both existing RS-485 installations and new ones. I’ll discuss this in the form of red flags that will trigger the discussion.
On a current project that Cx Associates is consulting on, the client has a goal of reducing their building’s peak demand charge. For commercial customers, peak demand charges are usually charged based on the peak kW demand of the building or facility during a certain time (e.g. 1-4 PM) of the day. If there is a peak kW outside of this specific time frame, there is no “peak demand charge” from the utility for this peak kW.
In Part One One of this series of posts on RS-485, I gave a high level introduction to the structural and electrical components of RS-485 networks. This week I’ll elaborate on those concepts and delve a little more deeply into some of the industry terminology and how it applies to those concepts. As always, please feel free to drop a comment if you have any questions or want further discussion on any of this information.
What is RS-485 and what does it have to do with buildings or building controls? If you’re asking this question either you’re just curious, or maybe something isn’t working quite right and you’re Googling to find an answer. Either way, I plan on giving you a high level understanding of RS-485 in this post, and how having a better grip on how it works can help building operators and controls contractors control their building more effectively.
Metering equipment, such as light loggers, temperature loggers, and AC current loggers can be very useful tools and sometimes necessary in the world of energy efficiency consulting. They can provide useful data on how equipment is operating and performing. I have written about metering in previous blog posts including one called “EM&V Metering: Right Place, Right Time, Right Duration” where I described the importance of identifying the correct way of deploying meters. In this post I am going to discuss the importance of verifying that meters or loggers are working correctly even before a metering plan is developed or the devices are deployed, as well as the importance of ensuring that the correct sensors are chosen for the application.
Chilled beams have been common in European building HVAC systems for decades, but they are just getting popular in the U.S. These units fit in a drop ceiling or can be hung flush to the ceiling and contain a chilled/hot water coil and, in the case of active beams, a duct bringing in ventilation air.