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Heating Degree Day Conversions English <==> Metric By: Henry Manczyk, CPE, CEM Director of Facilities Management, Monroe County, New York Introduction Currently available scientific and professional reference and research often expresses energy measurement in only one of the English (inch, pound) or Metric (system international) systems. Researchers, consultants, students and energy professionals often need to convert information from one system to another. The following information includes equations, tables and charts which one may use to convert heating degree-day information between the English and Metric systems.
Degree Day Definition Outdoor air temperature is a major climatic variable affecting energy use. The temperature is usually discussed in terms of "degree days" - heating degree days and cooling degree days. The number of degree days in a regular 24 hour period is determined by the difference between 65°F (18.3°C) and the average of the high and low temperatures for a specific day in questions.
Adding all degree days each day represents the total degree days per year. Cooling degree days are determined in a similar manner, except that 65°F (18.3°C) is subtracted from the average. English (°F) Heating Degree Days = 65°F - [High temperature (°F) - Low Temperature (°F)]/2 Metric (°C) Heating Degree Days ... more.
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= 18.3°C - [High temperature (°C) - Low Temperature (°C)]/2 Conversion Factors 1 English Degree Day = 0.5556 Metric Degree Day 1 Metric Degree Day = 1.8 English Degree Days Example In Poland, there are 3725 heating degree days on average per year.<br><br> To determine what the degree day equivalent would be in the United States: English Degree Days = 1.8 x 3725 Metric Degree Days = 6705 degree days or Metric Degree Days = 0.5556 x 6705 English Degree Days = 3725 degree days Heating Degree Day Conversions English <==> Metric The purpose of this worksheet is to allow the user to determine what the english or metric daily heating degree day equivalents would be for known daily high and low temperatures for a given region. The user has the option of entering the high and low temperatures in english or metric units. NOTE: Enter Appropriate Values in Shaded Regions!<br><br> If English Known, Enter 0 0 If Metric Known, Enter 1 Enter appropriate Fahrenheit Values: High Temperature 55 deg F Low Temperature 35 deg F English (°F)Metric (°C) High Temperature 55.00 °F Low Temperature 35.00 °F Average of High and Low 45°F Heating Degree Days = 20 High Temperature 12.78 °F Low Temperature 1.67 °F Average of High and Low 7.22°C Heating Degree Days = 11.11 1 English Degree Day = 0.5556 Metric Degree Day 1 Metric Degree Day = 1.8 English Degree Days Heating Degree Day Conversions English Degree Days Metric Degree Days English Degree Days Metric Degree Days English Degree Days Metric Degree Days 3,000 1,667 4,700 2,611 6,350 3,528 3,050 1,694 4,750 2,639 6,400 3,556 3,100 1,722 4,800 2,667 6,450 3,583 3,150 1,750 4,850 2,694 6,500 3,611 3,200 1,778 4,900 2,722 6,550 3,639 3,250 1,806 4,950 2,750 6,600 3,667 3,300 1,833 5,000 2,778 6,650 3,694 3,350 1,861 5,050 2,806 6,700 3,722 3,400 1,889 5,100 2,833 6,750 3,750 3,450 1,917 5,150 2,861 6,800 3,778 3,500 1,944 5,200 2,889 6,850 3,806 3,550 1,972 5,250 2,917 6,900 3,833 3,600 2,000 5,300 2,944 6,950 3,861 3,650 2,028 5,350 2,972 7,000 3,889 3,700 2,056 5,400 3,000 7,050 3,917 3,750 2,083 5,450 3,028 7,100 3,944 3,800 2,111 5,500 3,056 7,150 3,972 3,850 2,139 5,550 3,083 7,200 4,000 3,900 2,167 5,600 3,111 7,250 4,028 3,950 2,194 5,650 3,139 7,300 4,056 4,000 2,222 5,700 3,167 7,350 4,083 4,050 2,250 5,750 3,194 7,400 4,111 4,100 2,278 5,800 3,222 7,450 4,139 4,150 2,306 5,850 3,250 7,500 4,167 4,200 2,333 5,900 3,278 7,550 4,194 4,250 2,361 5,950 3,306 7,600 4,222 4,300 2,389 6,000 3,333 7,650 4,250 4,350 2,417 6,050 3,361 7,700 4,278 4,400 2,444 6,100 3,389 7,750 4,306 4,450 2,472 6,150 3,417 7,800 4,333 4,500 2,500 6,200 3,444 7,850 4,361 4,550 2,528 6,250 3,472 7,900 4,389 4,600 2,556 6,300 3,500 7,950 4,417 4,650 2,583 8,000 4,444 English <==> Metric Heating Degree Day Conversions English <==> Metric 1,500 2,000 2,500 3,000 3,500 4,000 4,500 3,0003,5004,0004,5005,0005,5006,0006,5007,0007,5008,000 English Degree Days Metric Degree Days