FAQ

Predecessor software to MarketManager used bin weather data to calculate energy usage before 1993. This data is no longer used in this way in MarketManager for Windows.

MarketManager utilizes 8 typical days per month (Sunday/Holiday, Monday, Tuesday, ..., Saturday, Peak Day). In the Calendar data form, if you click on "1-6" you will see (and can assign ) the number of Mondays, Tuesdays, etc that apply to each month of the year. The library has preconfigured CALENDAR items for this purpose.

There still is bin data attached to the weather item, though, representing 30 year averaged weather. This is used for two purposes. One is to find the average temperature per month; the other is to find the highest temperature bin in summer and lowest temperature bin in winter to be used in each month’s peak day.

MarketManager constructs peak and average day weather profiles using 30 year averaged bin weather data, mean daily ranges (found in ASHRAE Fundamentals 1989 page 24.4) and % Daily Range (from Table 2, ASHRAE Fundamentals 1989, page 26.5) which is presented below:

Both peak and typical day profiles have the same DB range around a midpoint. For a typical day, the midpoint is the monthly average temperature from the bin data. For summer peak, the midpoint is equal to the highest temp bin minus half the daily range. For winter peak, the midpoint is equal to the lowest temp bin plus half the daily range.

The Summer Peak Temperature profile is calculated using:

The Winter Peak Temperature profile is calculated using:

The Average Day Temperature profile is calculated using:

Actually, this equation works for typical day and summer and winter peak day profiles. (The other equations are easier to grasp.)

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