In case you missed last week’s post, you’ll need to go back and review the setup for this week’s demonstration of code challenges and mistakes. To summarize, I have an installed ENERGY STAR-qualifying 95% AFUE (efficient) boiler with a brazed plate heat exchanger, hot water reset control, and a variable firing rate that ranges from 20% to 100%. That firing range is even better than code requirements. The system is a duded-out energy code breaker in theory. Let’s look at what went wrong in order. I have a Nest cam in the backyard and a Nest thermostat for the boiler.…
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Over the last forty years, computers have become orders of magnitude more powerful while they have become much easier to use. When I was in college, mainframe IBM computers owned all the muscle of computations. I was terrified of coding and wanted nothing to do with that. Thankfully, graphical interfaces emerged to make it easy. I even conquered graduate school with Engineering Equation Solver (“do it with EES” as its creator, Professor Sandy Klein, used to say). Energy codes went completely the opposite direction, from a simple document from the IBM mainframe era (1989) to a behemoth that would break…
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Two weeks ago, in Natural Gas Savings – Traps and H Vacs we looked at some basic natural-gas-saving measures. The post was wildly popular, and I had a good time, so let’s do it again! We compared some aspects of natural gas end-uses and waste that compare to compressed air. For example, we looked at steam traps versus compressed air leaks. Similarly, there are a lot of things that can be done with steam supply sources v compressed air sources, both including controls and other things. Minerals Tap water typically has a lot of dissolved minerals, including calcium, magnesium, and…
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