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en:mervis-analytics:00-start [2019/04/15 11:17] j.siroky |
en:mervis-analytics:00-start [2019/04/15 16:55] j.siroky [CO2 concentration] |
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Mervis Analytics is a set of tools for HVAC and energy data analysis. Some of the analysis can be made directly in Mervis SCADA some are done in other tools that use Mervis SCADA as data source. | Mervis Analytics is a set of tools for HVAC and energy data analysis. Some of the analysis can be made directly in Mervis SCADA some are done in other tools that use Mervis SCADA as data source. | ||
===== Carpet charts ===== | ===== Carpet charts ===== | ||
- | The basic principle is similar to pivot tables and pivot charts. User defines columns, rows and fold function. Each cell's value then represents aggregation of all values that do belong to the particular cell (e.g. average of of all values that were measured on Mondays between 2 and 3 am). | + | Carpet chars do represent an efficient way for first visual data analysis. Beside classical carpet chart (or heatmap) we do use more sophisticated charts with aggregations. |
- | Here are examples of useful carpet chars applications. | + | Below are examples of useful carpet chars applications. |
==== Electrical heating ==== | ==== Electrical heating ==== | ||
- | Charts capture average electrical energy consumption during a week. In this case, electricity is used for heating | + | Charts capture average electrical energy consumption during a week. In this case, electricity is used for heating, as can be seen from the first chart (horizontal axis: hour in day, vertical axis: month). There is clear start and end of heating season. |
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Detailed look at weekly schedule shows that heating starts at 4 am during working days, except of Monday, when it starts at midnight, see next chart (horizontal axis: hour in day, vertical axis: day of week). There is a clear end of working hours, as expected in case of this office building. | Detailed look at weekly schedule shows that heating starts at 4 am during working days, except of Monday, when it starts at midnight, see next chart (horizontal axis: hour in day, vertical axis: day of week). There is a clear end of working hours, as expected in case of this office building. | ||
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==== CO2 concentration ==== | ==== CO2 concentration ==== | ||
- | Evaluation of CO2 by means of carpet chart can also provide quick overview. Data from IoT indoor air quality sensor are evaluated, in the next example. There is increase of CO2 concentration during opening hours. | + | Evaluation of CO2 by means of carpet chart can also provide quick overview. Data from IoT indoor air quality sensor are evaluated in the next example. There is increase of CO2 concentration during opening hours. |
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+ | ==== AHU pressure difference ==== | ||
+ | HVAC appliance operation can be investigated by means of carpet charts as well. Bellow is a carpet chart (horizontal axis: day, vertical axis: hour of day) of AHU pressure difference. It shows regular regime with some irregularities at the end of shown interval. Note that these irregularities cannot be easily found using a classical line chart. | ||
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