I’m writing this blog from the floor of the Andover Public Library in Andover, MA. After a major windstorm, power is out all over New England and people are scurrying for the few available power outlets and sources of internet.
There have been many blog posts by Cx Associates’ staff on the benefits of retrocommissioning (RCx), or the best way to begin the RCx process, and even posts on how to increase RCx adoption through efficiency programs. All of these are great posts and I encourage reading them to gain a better knowledge of RCx. Even though many buildings can benefit from RCx, there are some buildings that are actually not good candidates for it. So how do you know if your building is a good candidate for RCx? In this post I am going to give some examples that building owners, operators, and occupants can use to identify whether their facility can benefit from RCx, and determine when it is time to start the RCx process.
The process of designing and constructing a highly efficient, comfortable, and healthy building is challenging enough when the site is in the United States; that becomes a much more difficult endeavor when the site is on the most remote and coldest place on Earth. The design team for the new McMurdo Station in Antarctica approaches the problem with a holistic mindset centered around stewardship.
Recently, I’ve been getting excited about so-called “no touch” energy audits, which employ meter data analytics to assess a building’s energy performance and even make specific recommendations regarding potential improvements, all without requiring the (expensive) “boots on the ground” of a traditional energy audit. This idea has been getting a lot of attention over the past few years as the increasing availability of 15-minute electric interval data has met with the “big data” revolution. In this post, I’m going to take a quick walk through various analysis techniques, moving from coarser to finer granularity.
Back in 2015 I wrote a blog post about ASHRAE Guideline 36 - High Performance Sequences of Operation for HVAC Systems. I referenced a spec my team at Cx Associates wrote for a BAS controls upgrade. Now in 2017, that spec, and the sequences contained therein, have been made into a fully functional BAS controlling 14 air handlers (AHUs), over 90 variable air volume boxes, and the central plant that serves them. Our firm artfully adapted the sequences to meet the needs of the building owner and the function of the building (healthcare) without sacrificing the high degree of complexity which yields the energy savings building automation systems have been promising for decades. After working on this project from specs to implementation, I can confidently say that Guideline 36 can deliver a reduction in energy consumption and improved comfort. The cost (excluding the norms of engineering labor, BAS reprogramming, and commissioning) is primarily paid through raising all ships. Let me explain.
Early this year, Cx Associates and the Vermont Green Businesses Network (VGBN) were awarded the Burlington 2030 District Director contract. Cities and towns that become an established 2030 District commit to the Architecture 2030 Challenge, which requires all new buildings, developments, and major renovations to be carbon-neutral by 2030. Cx Associates and VGBN, as the Burlington 2030 District Director, are tasked with developing a roadmap for the newly established Burlington District and assisting it to become self-sufficient.
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?
Topics: Energy Efficiency
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.
Previous blog posts from my colleagues and I contain a detailed explanation of functional performance testing (FPT), an overview of how functional performance tests are created, and specific examples of how conducting FPT contributes to better building performance and energy savings. In this post I would like to expand upon the previous post “Functional Performance Testing Done Right: Details Matter.”