As a contractor I have experienced a very unique situation where work performed in a home is inspected by a 3rd party inspector, but the contractor cannot be on the premises. Besides Energy Upgrade…Continue
"Maybe I need to simplify further.
Do outdoor reset's save money?
ABSOLUTELY, PARTICULARLY WITH MOD/CON'S
BECAUSE IT ALLOWS HEATING WITH COLDER WATER
If you optimize the reset, what happens to recovery?
THE MORE YOU…"
"I figured Chris might come in on my side:
"The elephant in the room we are not looking at: The building shell and how good it is. How do we normalize the data based on that? Whatever, nothing against set backs - if you…"
"I'm with you on this one PJ (for once!). All else being equal (or equally bad), setback has the potential to save more than downsizing source equipment, although if the AC is grossly oversized, say, 200% or more, who knows. It's true that…"
"Does the oversizing study assume replacing the ductwork when a system is oversized or is the 5 ton system trying to push through 3 tons of ductwork? Did the system in the study have a TXV or orifice as the expansion device. TXV systems are a smaller…"
"On the cooling side:
1: It takes 10 minutes of run time for pressures to stabilize in most air conditioner systems.
2: Rated efficiency doesn't happen until pressures stabilize
3: Oversized systems rarely run longer than 10 minutes at a time,…"
"I've found setback thermostats to be VERY effective when combined with Time of use Electricity rates. In the summer our rate is 4.5 cents per KWH except for 2-7pm weekdays. 2-7pm weekdays the rate goes to 23 cents. Having the thermostat set for…"
"For people in the Bay Area, Nest is giving a technical seminar at our Lab on December 9. These are open to the public, but you need to contact the Coordinator (see link) to get a gate pass. Not sure if there will be a dial-in number; ask…"
"How about it auditors? Does anyone have any data showing changes in electical consumption from one year to the next by using a thermostat setback with electric heat? It would be helpful in this conversation and…"
"Power Factor devices do not work from an ROI perspective in homes because of the billing structure of many utility companies for residential dwellings. These devices are better suited for commercial applications."
The EEBC was formed in 2007 to provide a voice to the businesses involved in the manufacturing, distribution & installation of energy efficiency technologies. The EEBC's primary focus is to increase the business potential of the industry.See More
"a slightly more polite answer gets a reply to your questions:
TK> For me, 5% of total consumption (not just heat) would mean less than $50 a year. Do you think it would be fair to say this savings is so small as to be a rounding error?…"
"Jon - Yes that might be very useful! We would also want to know insulation and air leakage levels, and we would want to define what is statistically significant.
(Finally someone who can think outside the box! A questioning…"
Thanks for the data on setbacks. Very useful.
Seems like the data we need that might convince you is if we take combustion out of the equation. What if we showed that setbacks worked in homes heated only by electric…"
"True proof of savings is logging temperatures" ? really -- I thought true proof of savings is measuring energy use before and after in large scale studies. Isn't it energy savings we are after -- it seems like measuring…"
"Nonsense is doing weatherization work then claiming setback thermostats and "thermodynamics" are the cause of savings.
Nonsense is installing a setback thermostat with no tracking or monitoring, and claiming the thermostat and…"
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