Parameters & Datapoints in DEXCell EM

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This article includes the following sections:

  1. Parameters
  2. Datapoints
 

 1. Parameters

This section explains all the available DEXCell Energy Manager Parameters and how the Degree Days can be calculated in DEXCell.

1.1 DEXCell Energy Manager Parameters

Here you can find an updated spreadsheet with all accepted parameters by DEXCell Energy Manager. If you need to use a parameter that is not on this page, contact us to include it.

DEXCell EM parameters spreadsheet

1.2 Degree Days

DEXCell Energy Manager automatically calculates both Heating and Cooling Degree Days. This feature is free of charge, you only need to have a temperature meter in your location (physical or virtual). 

DEXCell EM will offer you three different parameters according to degree days: Cooling Degree Day parameter, Heating Degree day parameter and the sum of both.

In order to have Degree Days in DEXCell EM, either with the weather virtual station or with your own outdoor temperature sensor, the key is to have your location properly configured, so please make sure you:

      1. Have correctly set the Winter/Summer reference temperature in the location
      2. And also have set the "Outdoor temp" Reference Meter in the location.

By doing both actions you will enable the calculation of degree days and a new device "degree days" will appear in the configured location (remember that degree days are calculated once per day, usually at night or early morning, so there might be a delay of a day before you can use the new device).

 

1.2.1 Calculation Methods 

DEXCell EM allows the calculation of Day Degrees using two different methods:

  1. UK Met Office: Standard of the UK Met Office. It is the method that has traditionally been used in DEXCell EM.
  2. COSTIC: Standard of the Scientific and Technical Committee of the Climatic Industries of France, also called the Method of Energy Professionals.

The two calculation methods are detailed below. 

 

1.2.2 Heating degree days (HDD)

  • Once an "Outdoor temperature" is configured on the Location data page, the software will automatically calculate the "heating degree days" each day. The reference temperature has to be configured in the Location data page.
  • Degree Days calculation will be done each morning at 8:00h. In the case of changing the "Outdoor Temperature", you should wait until the next morning in order to get the first calculations or to recalculate the parameter.
  • Tbase for HDD is the winter reference temperature defined for the location.
  • Tmax is the daily maximum temperature from the outdoor temperature reference device.
  • Tmin is the daily minimum temperature from the outdoor temperature reference device.
  • The formulas used differ for each method.

 

UK Met Office

 

COSTIC

 

 

The result of the calculation for the COSTIC method is rounded to the closest integer, being 0,5 rounded to 1. 

 

1.2.3 Cooling degree days (CDD)

  • Once an "Outdoor temperature" is configured on the Location data page, the software will calculate automatically each day the "cooling degree days". The reference temperature has to be configured in the Location data page.
  • Degree Days calculation will be done each morning at 8:00h. In the case of changing the "Outdoor Temperature", you should wait until the next morning in order to get the first calculations or to recalculate the parameter.
  • Tbase for CDD is the summer reference temperature defined for the location.
  • Tmax is the daily maximum temperature from the outdoor temperature reference device.
  • Tmin is the daily minimum temperature from the outdoor temperature reference device.
  • The formulas used differ for each method.

 

UK Met Office

 

COSTIC

 

The result of the calculation for the COSTIC method is rounded to the closest integer, being 0,5 rounded to 1. 

 

2. Datapoints

This section includes the following subsections:

  1. Billable Datapoints
  2. Know how many meters/datapoints (billable points) has my account

2.1 Billable Datapoints

Here you have some questions and answers regarding the datapoints which are billable in DEXCell Energy Manager:

1) First, what is a paid Datapoint?

Any Datapoint with data stored, typically values every 15min, 30min or 1h, but as well every day or month. Typically are related to energy consumption values, weather, or external raw data to calculate KPIs (like units produced) using Excel files or the API.

2) Virtual Datapoints are billable? 

  • Groups (not billable): are not stored in the database, they are not charged.
  • Calculated Datapoints (not billable): these datapoints can be visualized or help triggering alarms, the values are stored daily/weekly/monthly but are not charged.
  • Derived Datapoints (not billable): to create variation parameters from only one Datapoint, for example for gas when converting from pulses to m3 or kWh. These Datapoints are not charged.
  • Heating and cooling degree days (not billable): these Datapoints are not charged.
  • New Datapoints created from the following Apps (billable): Virtual devices App, ForecastingApp, Carbon Emission AppManual Readings App (if you create a new device)


3) And what about meteo Datapoints and HDD/CDD?

DEXMA understands the need for some of the energy efficiency project to compare facility consumption according to the external temperature. In order to avoid hardware installation, DEXMA offers the integration with WeatherBit service where, just configuring the location postcode, DEXCell provides a list of the closest weather stations available. DEXCell gets data from these weather stations every 15 minutes, for both temperature and humidity. These are charged datapoints.

The meteo Datapoint can be shared within one Account of DEXCell Energy Manager without additional cost, but the “same” meteo used in different Accounts has a cost and is considered a paid Datapoint. In this last case, DEXCell Energy Manager replicates the storage of each meteo for future changes in historical values or architecture upgrades.

DEXMA doesn’t charge for HDD/CDD datapoints, we store daily values.

4) I need to create static or semi-constant Datapoints. Are they billable? 
Static Datapoints like surface or construction year of the building are parameters that rarely change over a month neither accumulate historical values, for this reason this kind of parameters won’t be charged.

The semi-constant attributes (Datapoints) to calculate KPIs are neither charged.

5) Historical data upload
Historical data introduced into any existing datapoint won’t be charged. If these historical data is introduced to a different device, in that case it will be charged.

If you want to know which meters/datapoints are billable in your account, check the following subsection

2.2 Know how many meters/datapoints (billable points) has my account

If you want to know how many datapoints or meters we are monitoring, follow these steps: 

  1. Access with a SuperAdmin user to your account
  2. Go to Account Management > Accounts

3. Under the Accounts menu, you will see the details of all your accounts including the license, creation date, expiration date... In this menu is where you will be able to find how many datapoints or meters you have contracted and are currently in use. Just click on the number you can find on the Meters/Datapoints column.

 
4. Then, we can see how many datapoints/meters are in use and which ones are billable, divided per gateway.
 

If we want to activate or deactivate some meters or datapoints, we have to acces our account > go to Settings > Gateways > Edit gateway > Devices

Here we can accept and reject devices or select which datapoints are we going to need. For further information, click on the following link

 

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