Your home: Calculate potential savings with the Home Heating Index
Miles per gallon
This is about using a gallon-miles method to calculate home heating performance and potential household energy savings. I will introduce the home heating index formula so that you can assess your energy performance and energy savings potential. By using this formula, you will learn how much energy you can save and the cost-effectiveness of these energy-saving measures.
I compare it to the number of miles per gallon of a computing vehicle. If you carry a small calculator in your car to calculate miles per gallon, raise your hand. The calculator I used was one of the first solar calculators to enter the market. There is no backup battery, and if I want to know how many miles per gallon my car adds to the last can of gasoline, I have to wait until the day is full.
In addition to assessing your riding performance, I also believe that most people are interested in assessing their home energy performance. Your home is 1 ton, four-wheel drive, lift with oversized tires, or is your home coming to the US on board? Of course, the difference between house performance and car performance lies in a very important way that your house can't see the spin out of the parking lot trying to impress the girl.
Houses must look good, but in terms of performance, the less energy you use, the better. I heard that someone replaced their car engine with a bigger, more powerful model and then boasted all the fuel it consumed, but I didn't hear anyone opening doors and windows at home and boasting their high electricity bills.
Similar to the number of miles per gallon in a car, home fuel consumption can be measured to determine the benefits of installing energy-saving measures. When we talk about a family instead of using miles per gallon, let's use what the housing industry uses, let's call it the home heating index. The heating index provides a way to compare houses of different sizes and climates and to determine the cost-effectiveness of energy efficiency measures.
Household energy use
In the heating climate where the heating degree is several days [using a lot of furnaces] and the heating and cooling degree [using a lot of air conditioners], the calculation is called the home heating index. Then, in a similar manner, when the number of days of cooling exceeds the number of days of heating, it is called the home cooling index.
Today, I will show the home heating index. It turns out that the heating index is more favorable and more accurate than the cooling index. Other than that, the outside is very cold, and time is concerned with heating. [In addition to people far south, I will report the household refrigeration index again.]
So, before you continue to climb the attic, explore the floor, investigate equipment efficiency, and everything else that happens during the energy audit, you should come up with your favorite solar calculator and calculate the home heating index. With the Home Heating Index, you can usually guess correctly if there is insulation in the attic space, and if so, should you add more.
Calculate the home heating index:
The home heating index is calculated using Btu, square feet of living space and heating days. This calculation can be done when the home heating system is electricity, gas, propane, wood, oil or candles.
The home heating index for wood-heated homes is more complicated because Btu is calculated for each rope of each species. I think after getting a new calculator, I will burn the wood for a while.
Let us use the electric heating to calculate the home heating index of the family. This will include electric stoves, space and wall heaters, heat pumps, radiant ceiling heat or floor heat. For this calculation, we will assume that this home has an electric water heater.
Step 1: Data for electricity bills
Electricity bill energy consumption
Pick up your electricity bill and check your home kWh in October. In my example home, the house used 1,640 kWh that month. Now look at the bar chart and select the month with the least amount of electrical usage. This is the month with the least amount of heating and cooling demand, estimated to be the kWh used this month. In my example home, in September, about 680 kWh was used. This number represents electricity for water heating, cooking, lights, etc. - everything except heating and air conditioning.
Subtract 680 from 1,640 - a difference of 960 kWh. This is the energy used for heating in October.
Step 2: Find the square feet of heating in your home.
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My example is a two-story home. There are 920 square feet on the first floor and 800 square feet on the second floor. The total area = 1,720.
It may be necessary to take out the old tape measure, remembering that the square foot is the length multiplied by the width.
Measure your home
Step 3: Determine the number of days of heating in your location in October.
Go to http://www.degreedays.net.
Enter your zip code in the box labeled "Weather Station ID" and click on "Station Search". A box will drop down and select the nearest weather station to your home.
For Degree Day Type, select "Heating", for Temperature Units, select "Celsius" or "Fahrenheit".
Keep the base temperature at 65 degrees and continue, and check the appropriate box to include "near base temperature."
For the segmentation selection, select "Monthly" and for the coverage period, select "Last twelve months".
You can now click on "Generate a Degree Day".
At the top of the screen, a new box will appear with a dotted wheel rotation indicating that the heating days are being calculated. Wait until the wheel stops and the box says "Your degree is ready" and then click "Download Now".
Open the downloaded chart and select the number of degree days in October. For my sample family, the degree day is 344.
Step 4: Convert kWh to Btu.
This equation uses Btu, so we need to convert kWh to Btu. The chart below will allow us to convert. If you use natural gas or propane, the conversion number will also be given.
1. One kWh of electricity is equivalent to 3,412 Btu.
The heat of a natural gas is equal to 100,000 Btu
One gallon of propane is approximately equal to 91,450 Btu'
My example home uses 960 kWh of heating time to convert to: 960 times 3,412 equivalents of 3,275,520 Btu.
Step 5: Insert the data into the Home Heating Index equation.
Length x width
To use the data we collect to determine the home heating index, the first thing we have to do is multiply the square feet by the number of days of heating. Again, for my sample home, I will add 1,720 square feet and a heating rate of 344 days. They are multiplied, equivalent to 591,680.
Now we need to divide Btu into 591,680. This would be 3,275,520 Btu divided by 591,680 to provide a home heating index of 5.53. To evaluate the home heating index of 5.53, we used the following chart to make a fossil fuel heating house and slightly lower the chart of the electric heating house.
The home heating index is between 0 and 2; Airtight, super insulated, 90+ heating efficiency, heat recovery ventilator, small window area and high window r value.
Between 2 and 4; Good insulation, low air leakage, efficient heating system, super-centage US flagged or Canadian R-2000.
Between 4 and 8; Better than ordinary households, good insulation performance. A relatively low amount of air leakage is superior to the average heating efficiency.
Between 8 and 13 years old; Average insulation, average air leak and average heating efficiency.
13 to 18 years old; It is worse than ordinary households, with poor insulation, large air leakage, and poor average heating efficiency.
Between 18 and 22 years old; Older houses have poor insulation, large air leaks, and low efficiency in the heating system.
[John Krigger's residential energy residential heating index chart]
By using the chart, we can see that my home heating index is 5.53, not an efficient home rather than energy consumption. It is better than the average family and can benefit from additional insulation, additional air sealing, and benefits from a more efficient heating system. We can also seek additional energy savings through more efficient appliances and efficient lighting.
By using the Household Energy Index score, we can see that some additional weathering improvements can reduce energy consumption and are cost effective. If a home has a score of 1.5, then weathering retrofits may not be cost effective. However, if the house score is 15, then the house can benefit from energy-saving measures, whether it is weathered or efficient appliances, these transformations will certainly be cost-effective.
Unfortunately, the home heating index is more difficult to calculate than the number of miles per gallon. However, its meaning is more important. You may not be able to increase the number of miles per gallon of your favorite car, but this is also the case in your home, and you have a great opportunity to increase energy efficiency and save a lot of money. You can use it to buy gasoline for your car.
Thank you for coming, I hope to see you soon, but I will not leave you a bright light...
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