Davis Instruments Energy EnviroMonitor User Manual
Also see for Energy EnviroMonitor: Installation manualSystem installation guide
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Contents
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Weather Conditions Measured/CalculatedEnergy EnviroMonitor Manual Page 7Heating Degree-DaysHeating degree-days provide a measure for calculating the effect of tempera-ture on the use of energy to heat a location. Essentially the opposite of coolingdegree-days, heating degree-days take into account the accumulation of coldwith passing time to calculate energy usage. One heating degree-day accumu-lates when the temperature remains one degree below the threshold for 24hours. One heating degree day also accumulates when the temperature remains24˚ below the threshold for 1 hour. The Energy EM calculates both normal heat-ing degree-days and wind chill heating degree-days. Wind chill heatingdegree-days uses apparent temperature (see “Temperature and Apparent Tem-perature” on page 7) instead of outside temperature when calculating heatingdegree-days.• “Daily” Heating Degree-Days Sum (AutoClear)• Heating Degree-Days Total for the period (Alarm: High/Low)• Average Daily Heating Degree-Days over the period• “Daily” Wind Chill Heating Degree-Days Sum (AutoClear)• Wind Chill Heating Degree-Days Total for the period (Alarm: High/Low)• Average Daily Wind Chill Heating Degree-Days over the periodTemperature and Apparent TemperatureThe Energy EM has a temperature sensor built into the console which reportsinside temperature. You may use either the external temperature sensor, stain-less steel temperature probe, or external temperature/humidity sensor (see“Optional Sensors” on page 1) to measure outside temperature. Outside tem-perature does not necessarily have to measure outside temperature, of course.It measures the air temperature wherever you have located your temperaturesensor.Temperature-humidity index (T-H index), commonly called heat stress, usesthe temperature and the relative humidity to determine how hot the air tem-perature actually “feels.” When humidity is low, the apparent temperature willbe cooler than the air temperature since perspiration can rapidly evaporate intothe air. However, when humidity is high (i.e., the air is saturated with watervapor) the apparent temperature will be higher than the air temperature.Note: The Energy EM measures T-H index only when air temperature is above 68˚ F (20˚ C) because it isa measure of heat stress which is not significant at lower temperatures. 125˚ F (52˚ C) is the high-est T-H index for which calculation factors are available. Above 125˚ F (52˚ C), the system simplyreports that T-H index is “high.” |
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