How do you calculate energy consumption using degree days?
The simplest way to normalize energy-consumption figures is to calculate the kWh per degree day for each kWh energy-consumption figure in question. Simply divide each kWh figure by the number of degree days in the period over which that energy was used.
How is a degree day calculated?
Degree days are the difference between the daily temperature mean, (high temperature plus low temperature divided by two) and 65°F. If the temperature mean is above 65°F, we subtract 65 from the mean and the result is Cooling Degree Days.
How do you calculate heating cost of degree days?
For each period over which the outside air temperature was constant, you multiply the degrees below the base temperature by the number of days that the temperature was constant for (usually a small fraction of a day), and then you sum all the values together to get the total heating degree days for the longer period …
How do you calculate energy baseline?
The current year’s energy use using the energy intensity of the baseline year is called the ‘business-as-usual energy use in the current year. ‘ The overall change in energy intensity is calculated by comparing the actual energy use in the current year to the ‘business-as-usual energy use in the current year.
How do you calculate degree hours?
It is known that degree-hour values are calculated simply by summing up the differences between the hourly dry-bulb temperatures and a standard reference temperature (base temperature). Instead of hourly outdoor temperature, daily average outdoor temperature is used in degree-day calculations.
How do you calculate CDD and HDD?
For HDD they subtract the average temperature from the base temperature (taking zero if the average temperature is greater than the base temperature on that day). For CDD they subtract the base temperature from the average temperature (taking zero if the base temperature is greater than the average temperature).
How is degree day freezing calculated?
Calculate the average temperature of the day by adding low temperature and high temperature and dividing by 2. Use degrees Fahrenheit. Now subtract that average from 32 degrees, the temperature at which water freezes. You have now just calculated what they call “freezing degree days.”
How many cooling degree days do you have with a high of 95 F and a low of 65 F?
8 cooling degree days
A cooling degree day is every degree that the mean temperature is above 65 degrees during a day. So, if the high temperature for the day is 95, and the minimum is 51, the average temperature for the day is 73. That would be 8 cooling degree days (73-65).
How do you calculate energy load for a building?
Calculating Load
- Add together the wattage capacity of all general lighting branch circuits.
- Add in the wattage rating of all plug-in outlet circuits.
- Add in the wattage rating of all permanent appliances (ranges, dryers, water heaters, etc.)
- Subtract 10,000.
- Multiply this number by .
- Add 10,000.
How do you calculate the number of degrees per day?
Degree days are determined by comparing the average temperature of the day to a standard, 65-degree baseline. There are two ways of making this calculation: During the summer, cooling degree days are calculated by taking the day’s average temperature and subtracting…
How do you calculate expected energy consumption from degree days?
With the regression equation you can calculate the baseline, or expected, energy consumption from the degree days. So, each time you obtain a new figure for the degree days (typically each week or month), you can plug it into the regression equation to get the expected energy consumption.
How do you calculate kWh per degree of day?
Simply divide each kWh figure by the number of degree days in the period over which that energy was used. In theory, dividing by the degree days factors out the effect of outside air temperature, so you can compare the resulting kWh-per-degree-day figures fairly.
What do the heating degree-day figures mean?
Heating degree-day figures come with a ” base temperature “, and provide a measure of how much (in degrees), and for how long (in days), the outside temperature was below that base temperature. In the UK, the most readily available heating degree days come with a base temperature of 15.5°C; in the US, it’s 65°F.