This is similar to the chart above, however considering the water heater also. (6) Source: Presentation to Redwood Energy, February 2019 Space heat pumps, nevertheless, are not such a clear win. These heat pumps will run nearly continuously in the cool and reasonably filthy night hours, while a gas furnace will run infrequently.
( 7) Source: Discussion to Redwood Energy, February 2019 When you look across the entire day, there is still a sizable benefit to utilizing a heat pump for space heating. (Space heating systems that exceed the minimum of 8.2 HSPF will do somewhat much better than shown here.) Source: Presentation to Redwood Energy, February 2019 If your home is not well insulated, though, the story is different.
Instead, the best thing is to improve insulation first. Source: Discussion to Redwood Energy, February 2019 To sum up, if you intend to lower your heating emissions, a heat pump water heating unit is a clear win, as is a heat pump for space heating if your house is constructed to modern codes (i.e., is well insulated).
Reducing a house’s heat loss is a great concept not just for lowering emissions however also for much better resilience to energy outages. There are a number of factors besides emissions that enter into play when choosing electric vs gas heat. They include expense, strength to outages, home impact (e.g., air quality, sound), heating system positioning, and security.
Even when thinking about just emissions, this post overlooks not just the fugitive emissions of gas to the house however also the impact of any leaking refrigerant from the heat pump. (8) So this is not a complete photo. However I hope it provides more details about how heaters are assessed and what may make sense for your house.
Silicon Valley Clean Energy (SVCE) details can be discovered here: https://www.svcleanenergy.org/water-heating, including a link to an useful buyers guide. Palo Alto Utilities has info here: http://cityofpaloalto.org/hpwh. PCE does not presently have a reward for heat pump water heating systems. (They are running a trial, which is completely registered.) However, they do have terrific rewards for EVs.
If you are interested in finding out more about energizing your house, on Thursday October 10, from 2-7pm, the City of Palo Alto Utilities is hosting the Bay Location Electrification Expo in coordination with local partners to supply hands-on education and resources for structure specialists and location locals wishing to further decrease their carbon footprint.
Thank you to Martha Brook and to agents from the regional utilities for evaluating and providing feedback on this post. Notes and Recommendations 1. This information point originates from slide 4 of this discussion by Martha Brook at the CEC. 2. That is not the case for electrical energy. Due To The Fact That Palo Alto has so much industrial space, over 80% of our electric load is from commercial use(!) 3.
The February 2019 discussion at Redwood Energy is here. All information for the June 2018 CEC workshop can be discovered here. 4. This chart and others in this post show the actual grid mix instead of our portfolio mix, which is much cleaner. If we were to adopt a model where we use a cleaner portion of the grid, then others would need to use a dirtier part of the grid.
We want electrification to be taking place all over the state, no matter the electrical portfolio the numerous utilities maintain. Our own utilities’ zero-carbon contributions are to the grid as a whole, making it greener for everybody (thank you!). So I make the emission calculations in this post based upon the grid mix, just as I hope others are carrying out in places with a less green electrical power portfolio.
5. Some videos that describe how heat pump work can be discovered here and here. 6. This is for environment zone 3 (” CZ 3″) in a home constructed to the current code (” 2019 Sexually Transmitted Disease”), and it utilizes the 2019 emission intensity numbers revealed in the earlier chart (” 2019 GHG”). The “POLICE” or “Coefficient of Performance” of 3 is the ratio of heat output to electrical energy input (a somewhat less robust variation of UEF).
That holds true even when using the cleaner power of 2030, as revealed listed below. The heater utilized in this case satisfies but does not exceed minimum federal standards, as required for this screening. (” HSPF” or “Heating Seasonal Performance Element” is a seasonally averaged POLICE.) A more efficient heater would do better, however keep in mind that the red locations will remain red, offered the multipliers in those squares.
This slide (the right-hand side) demonstrates how big an effect leaked refrigerant has on emissions when a home is amazed. The color-coding for these charts is: lightest blue: refrigerant leak, green: plugs, dark blue: devices, yellow: lights, tan: water heating, orange: cooling, medium blue: area heating. Our climate is probably somewhere between Sacramento and Los Angeles.
Some of you might be questioning why we don’t utilize gas-powered heat pump. I need to act on that. Something to remember is that heat pumps can air-condition too, and I expect that when they are used for cooling, it makes the case for electrical more powerful.
Present Climate Information (August 2019) Global impacts, US impacts, CO2 metric, Environment control panel (2018 ) Comment Guidelines I hope that your contributions will be an important part of this blog. To keep the discussion efficient, please abide by these standards, or your remark may be moderated: – Avoid disrespectful, disparaging, snide, angry, or ad hominem remarks.
Choosing which heater to set up in your house can definitely be a bit overwhelming: there are so lots of great alternatives, how do you even begin to choose? Well, we have actually decided to help you narrow down your choices by discussing two of our preferred systems, We believe that both of these systems are quite awesome, and below, we’ve discussed the benefits of each.