Gross calorific value of natural gas is defined as the total quantity of energy released during the complete burn, in air, of a specific amount of natural gas.
The gas energy content is determined by their gross calorific value, meaning the quantity of heat released during the burn of a cubic meter of gas and it is expressed in kWh/m3.
The heat quantity released while burning one cubic meter of gas can vary based on the chemical composition of the natural gas, which is determined by the source of the gas.
The determined values of the natural gas gross calorific value, for each gas exit point from the national gas transport system to directly connected consumers and each gas entry point in the distribution system, are communicated to the natural gas supplier by the transport operator/natural gas distribution operator.
The calculation of the consumed energy is achieved by multiplying the consumed natural gas volume in a certain period of time with gross calorific value and with a unit price expressed in RON/kWh.
The consumed energy quantity is determined by the following formula:
E = V x PCs, where:
E represents the consumed energy quantity - Kwh
V represents the measured volume in a reference system - m³
PCs represent the gross calorific value Kwh/m³