Continuing last month’s topic of commissioning action lists (a.k.a. master issues logs, a.k.a. corrective action lists), I would like to focus on the items in those documents that deal with construction phase or acceptance testing “deficiencies.”
Uniform Solar Energy and Hydronics Code (USEHC) contains some requirements that may be inappropriate given certain conditions, climates, or simple designer discretion. That’s not a problem … unless your locality or state adopts USECH language as binding. Dig into the problem and note a timely opportunity to avoid having these issues set in stone for another few years.
As early as 3000 BC, civilizations began to create codes for public order and safety. The Code of Hammurabi, the old “eye for an eye” law many are familiar with, also included laws for safe building construction.
Once we distinguish voltage unbalance from voltage variation, the need to tackle the issue intelligently becomes even more clear. Learn about common causes and effects, testing for unbalanced voltages and single-phasing, and ways to correct the problem if it does manage to arise.
So many areas where a little forethought and awareness can avoid larger problems — sizing, velocity, piping and connections, double trapping, condensate return, proper pressure, blowdown tanks, and more. Read on for some good habits and why they’re worth having.
When designing or replacing a low pressure steam boiler, throw out everything you know about hydronic boilers. A steam system is closer in operation to an air conditioning unit than it is to a hydronic boiler. If you design a steam system using hydronic design methods, it will not operate properly.
Leaning on experience and data from various K-12 cities and projects, the authors pursue some less conventional design approaches. They may revolve around radiant heating and/or cooling, but depending on school size and other factors, the smart use of heat recovery, DOAS, and improved central plants could also put a project on the HVAC honor roll.
Budgets, codes, and technologies are constantly shifting and evolving. These days, even the classrooms are often portable. Staying one step ahead will depend on your knowledge of current design options and how to integrate them into the space.
What is the difference between a typical BAS scenario and one that involves building analytics? And why did one library start to see its utility costs and trouble calls start to spiral upward? As you might imagine, the answers to these questions are related …
Since the early ’80s, building automation technology (BAS) have played an integral role in engineers’ ability to aid facility owners and operators in achieving operational efficiency, dependable comfort, and lower energy costs. However, despite significant capital investments, often times the full potential of these systems is not realized, resulting in less than optimal building performance.
Whether one calls it a commissioning action list, a master issues log, a deficiency list, a corrective action list, etc., every commissioning project includes a matrix of items needing attention by someone on the project team. This table is the responsibility of the commissioning professional to create, maintain, and share with the team.
Retrieving every last bit of performance from the system while stopping short of the surge line is no small feat. Dig into sizing, tower selection, chilled water loads and stability, and condenser water management to leave no efficiency stone unturned. Read more in April issue