A dataset of measured energy consumption, solar production and building air leakage for a zero energy commercial building

The primary and secondary data that accompanies this data descriptor is provided at Open science framework Respiratory (OSF)15. The dataset is organized into five categories: (1) measured energy consumption, (2) measured energy production, (3) measured air leaks in buildings, (4) meteorological documents and (5) architectural and technical documents (AE). All data is provided in .xlsx format, except EnergyPlus weather files and AE documents. Table 2 characterizes the primary data records for the study.

Table 2 Presentation of the primary data output.

To assist users of this dataset, the authors provide AE ​​documents, publicly available weather data, and the EnergyPlus (.EPW) weather file for the case study building site. These data are considered secondary data because they were not measured directly by the authors. Table 3 provides an overview of the secondary data for the data measurement period.

Table 3 Overview of secondary data.

Energy consumption

Circuit-level energy consumption data (demand over time – kWh) was measured from June 18, 2014 to December 13, 2016. The data is organized into four data sets showing the energy consumption for the whole building and three end use categories: lighting, socket and process loads (PPL), HVAC energy consumption and hot water. Each dataset contains hourly circuit-level data and aggregated data for the total consumption of the entire building at hourly, daily and monthly resolutions presented in separate tabs. In addition to the total energy consumption for the entire building and the three end uses, the energy consumption for the first floor versus the second floor, interior lighting versus exterior lighting and HVAC relative to hot water are provided in the end-use data sets in the tabs for hourly, daily and monthly aggregated data.

The monthly energy consumption of the entire building varies from 985 kWh to 2,482 kWh over the measurement period (with a monthly average of 1,499 kWh). The average daily energy consumption over the entire measurement period is 49.4 kWh per day. Higher energy consumption for HVAC, hot water and interior lighting is observed during colder months with longer nighttime hours. Seasonal variations in HVAC energy consumption are greater than 1,000 kWh, while interior lighting is approximately 100 kWh. No significant seasonal or monthly variation was observed for exterior lighting. However, there is an increase in energy consumption for outdoor lighting from December 2014 due to a change in the control system which resulted in some lights being constantly turned on during the day. The monthly energy consumption for the PPLs was less than 300 kWh per month with a fluctuation of 100 kWh between the different months of July 2014 to October 2015. No major outliers were found in the datasets. A few outliers in PPLs have been observed, possibly due to human-construction interactions. Data for Energy Recovery Ventilation (ERV) systems is included in the dataset, but it should be noted that the ERV was unplugged by the owner within the first month of operation due to related issues. to indoor humidity.

Energy production

Energy production data for the period May 15, 2014 to December 31, 2020 is provided in a single .xlsx file. The data is organized into daily and monthly resolutions presented in separate tabs. Although the data was measured at hourly intervals, the hourly resolution of the data is not included in this dataset because the data export function on the solar PV user interface only exports the measured data. at daily intervals. Daily data was aggregated into monthly data in Excel and examined for missing data. The years 2015, 2016 and 2017 have missing data for two to eight months in the year due to accidental system shutdowns. Overall, 66 months have complete data for all days of the month. Missing data was displayed in gray cells on the daily and monthly data tabs. Monthly averages over the entire 7-year period and a 3-year period with complete data for all months of the year (2018 to 2020) are also provided in the monthly data tab. The minimum, maximum and average values ​​for daily energy production are provided in the Daily Data tab.

The annual average energy production is 1,218 kWh for years with no missing data (2018 to 2020). More than 1,000 kWh of energy are produced in a month from March to October. However, greater energy production was observed from April to August, with July having the highest energy production on average over the 7 years of measurement data. The highest monthly energy production was recorded with 2,213 kWh in May 2015. Figure 3 shows the variations in daily energy production from August 2014 to May 2015.

3

Example of daily energy production data. Lighter shades represent higher energy production.

Building air leak

Building air leakage data is provided in a single .xlsx file. USACE protocol and ASTM E779 require the depressurization and pressurization test report. Results are tab separated in the file. Each test (eg, tab) reports three columns of data: (1) test point, (2) mean induced chamber pressure (+/− 75 Pa), and 3) corrected total fan flow rate (CFM).

Meteorological data

An EnergyPlus (.EPW) weather file for Charlottesville, VA is provided for building energy simulation applications16. Measured weather data for Charlottesville, VA provided by the Weather Underground website17 from June 2014 to December 2016 is also available in the respiratory OSF. Daily and monthly weather data resolutions are provided in two separate subfolders in the respiratory system. Weather data includes temperature, dew point, humidity, wind speed, pressure, and precipitation. Daily weather data in the .xlsx file is provided in separate tabs for each month of the energy consumption measurement period. The average for each month is shown in the last row of the tab for that month. Monthly weather data includes heating degree days (HDD) and cooling degree days (CDD) and is provided in both SI and IP unit systems. The baseline temperature was 18 ° C (65 ° F) for both HDDs and CDD. To aid in the study of the correlation between solar radiation and solar energy production, solar radiation data is provided by the National Oceanic and Atmospheric Administration (NOAA) website.18 for Charlottesville, VA for the energy production measurement period (2014 to 2020) in hourly, daily and monthly resolutions.

AE documents

Design documents are provided with permission of the design team in a single .pdf file. Architectural floor plans, elevations, sections, and details provide context for the enclosure’s mass and thermal performance. Appendices and notes accompany the mechanical, electrical and plumbing plans to scale. The corresponding author verified the field conditions against the plans during the initial commissioning process of the project. Finally, a schematic plan of the solar photovoltaic system was developed by the research team and included in the AE document folder.

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