Building performance
Energy management systems, baseload, savings measurement, equipment performance and condition monitoring.
Energy data means little until it is related to the work done: cooling delivered, air compressed, hours occupied.
Start with the equipment performance boundaries guide, then use the COP, pump and compressed-air calculators.
Learning path
10 guides · about 113 minutes
- Intelligent energy management systems (IEMS) How to select an IEMS: measurement boundaries, local and cloud architecture, baselines, data quality, control responsibilities and acceptance tests. 17 min
- Finding and valuing overnight baseload How to measure the electricity a site uses out of hours, separate must-run loads from waste, value the avoidable part and verify a change. 11 min
- Measuring energy savings against a baseline How to measure energy savings from a retrofit: adjusted baselines, regression models, savings uncertainty, the four IPMVP options and the data to collect before the change. 12 min
- ISO 50001 energy management and the data it needs What ISO 50001:2018 requires of an energy management system: the energy review, significant energy uses, EnPIs and baselines, the data collection plan, and the metering that supports them. 12 min
- EU Directive 2023/1791 on energy efficiency What the recast Energy Efficiency Directive (EU) 2023/1791 requires of enterprises: energy management systems above 85 TJ, audits above 10 TJ, action plans and the key dates. 9 min
- ESOS compliance and the metering behind it ESOS phase 4: who qualifies, the dates, the 95% rule, estimates, penalties, and a worked example of submetering the areas of significant energy consumption. 9 min
- SEAI EXEED grants and the metering they need SEAI EXEED grant rates for 2026, the retention that measured savings release, a worked heat pump example and the metering to fit before the works start. 10 min
- Equipment performance monitoring boundaries Define the input, useful output, operating state and time boundary for pumps, compressors, boilers, chillers and heat pumps before you calculate a performance figure. 9 min
- Condition monitoring from electrical data What energy-monitoring data can tell you about motors, pumps, fans and compressors, how to build a baseline, and when you need vibration or thermal measurement instead. 10 min
- Environmental monitoring with IoT sensors Place temperature, humidity and CO₂ sensors where they answer the question, and know their response time, drift and missing data. 14 min
Calculators
All calculators- Heat meter check Estimate heat output from flow and temperature difference to check a heat meter reading.
- Compressed air specific power Calculate compressed air specific power: electrical input per unit of delivered air flow.
- Pump affinity laws Estimate how flow, head and power change when a centrifugal pump's speed changes.
- Chiller COP Calculate chiller COP, kW/ton and EER from cooling output and electrical input.
- Heat pump COP Calculate a heat pump's instantaneous COP or measured-period performance factor from heat delivered and electricity used.
- Generator fuel consumption Calculate generator fuel use per hour and per kWh, and the average load over a run.
- IP rating Decode an IP code: the solids and water numerals, the optional letters and what the rating leaves out.
- Gas m³ to kWh Convert gas meter readings or volume to kWh using the calorific value and correction factor.
- Energy unit converter Convert kWh, MJ, Btu, therms and toe, or kW, Btu/h, tons and hp, with every unit at once.
- Carbon emissions calculator Convert kWh of electricity or gas to CO₂e with dated, sourced factors or your own.
- Energy monitoring payback calculator Estimate the payback of an energy monitoring system from spend, expected saving and hardware cost.
- Dew point and humidity Find dew point from temperature and relative humidity, or the reverse, with absolute humidity.
EpiSensor products
Devices for this topic
Measuring the performance of a plant item?
Tell System Builder which equipment you want to monitor. It lists the inputs and outputs to measure and the hardware for each.