Heating value: The heating value is the amount of heat released by burning a set quantity of the gas supplied. Usage (MJ): Your total consumption, in mega joules, for the billing period. Unit price/rate: The amount you are charged per megajoule.
What does heating value mean on my bill?
Heating value: The heating value is the amount of heat released by burning a set quantity of the gas supplied. Usage (MJ): Your total consumption, in mega joules, for the billing period. Unit price/rate: The amount you are charged per megajoule. Supply charge / service charge: A charge applied for the supply of gas to the property.
How do you calculate gas consumption on a gas bill?
When you look at your gas bill, this is how it will appear: (current reading – previous reading) x heating value x pressure correction factor = Gas used (also known as consumption) ADJUSTMENTS FOR BLENDED RENEWABLE GAS Hydrogen has a lower heating value than natural gas.
How much is the average gas bill in the US?
How much is the average gas bill? The average annual residential gas bill was $712 in 2019, according to the most recent data from the American Gas Association. That’s about $59 per month. Some people pay natural gas and electricity charges together on a ...
What does volume mean on a gas bill?
Volume: The cubic meters / cubic feet of gas you have consumed during the billing period. Correction / pressure factor: The correction factor takes into consideration changes in the volume of gas-based pressure as well as temperature. Heating value: The heating value is the amount of heat released by burning a set quantity of the gas supplied.
What is gas heating value?
The heat value of a fuel is the amount of heat released during its combustion. Also referred to as energy or calorific value, heat value is a measure of a fuel's energy density, and is expressed in energy (joules) per specified amount (e.g. kilograms).
What is heating value and pressure factor in gas bill?
The heating value is impacted by the temperature and pressure at different geographical locations. We calculate your bills with the heating value that is supplied by your local distribution company. The pressure factor, also provided by your local distribution company, is used to calculate your gas consumption.
How is heating value measured?
Higher heating value It is measured as a unit of energy per unit mass or volume of substance. The HHV is determined by bringing all the products of combustion back to the original pre-combustion temperature, and in particular condensing any vapor produced.
What is the unit of heating value?
The heating values for gaseous fuels in units of Btu/lb are calculated based on the heating values in units of Btu/scf and the corresponding fuel density values. The heating values for liquid fuels in units of Btu/lb are calculated based on heating values in unit of Btu/gal and the corresponding fuels density values.
How is gas heating measured?
Gas appliances usually detail their energy consumption in terms of megajoule-hours (MJ/h), that is, the number of MJs the appliance consumes in one hour. For example, a gas heater with an input of 25 MJ/h will consume 25 MJs in one hour.
How is my gas bill calculated?
How to work it outTake away your last reading from your current reading. This is how many units you've used.If you've got a metric meter (m3), you can ignore this step. ... Multiply this number by the calorific value. ... Multiply this number by 1.02264. ... Divide this number by 3.6. ... Multiply this number by the price-per-kWh.
Which heating value is more important?
If water is present as vapor, then the heating value is called net calorific value. In real operating situations, water in exhaust gases is present as vapor, so net calorific value is more important for energy efficiency calculations.
What does heat value indicate?
Heating value is the amount of heat obtained when fuel or some other substance of a specific unit quantity is combusted. There are two types of heating values: The lower heating value (net) is the difference between combustion and latent heat of vaporization of the water vapors formed from combustion.
What is high heating value?
Higher Heating Value: A measure of heat content based on the gross energy content of a combustible fuel. Also known as "upper heating value."
What is low heating value?
Lower heating value is a measure of the amount of heat generated from full combustion of a hydrocarbon not accounting for the heat contained in combustion products if not returned to pre-combustion temperature.
What is high heating value and low heating value?
The key difference between HHV and LHV is that HHV can be determined by bringing all the products of combustion back to the original pre-combustion temperature while allowing any produced vapour to condense. Meanwhile, LHV can be determined by subtracting the heat of vaporization of water from the higher heating value.
What is the difference between gross heating value and net heating value?
Gross calorific value of a gas is the quantity of heat liberated by the combustion of unit volume of gas. (b) Net calorific value of a gas is the gross calorific value minus the latent heat in the water produced by combustion of the hydrogen in the gas (free or combined) above atmospheric temperature.
What is gas pressure factor?
Gas Pressure Factor A factor applied to your gas usage when it is delivered at higher than normal pressure.
Why is my AGL bill so high?
It's possible that the higher bill you received is due to an estimated bill. There are a few reasons why we might need to estimate your energy usage: The distributor had trouble accessing your meter. This could be due to your meter being indoors, behind a locked gate, or guarded by a dog.
What is Supercompressibility factor of natural gas?
Estimate hp required to compress natural gas J = Supercompressibility factor—assumed 0.022 per 100 psia suction pressure.
How do you calculate pressure correction factor?
To determine corrected flowrate: find the gas for which the meter is calibrated in the left column, move to the right to the gas that is being used. Multiply the flowrate indicated on the meter by the correction factor. This will equal an approximation of the flowrate of the gas being used.
How to notify gas retailer of gas increase?
They may notify you in writing, by a letter with the bill or by a notice on the bill itself. Compare the rates on your high bill to the rates on your previous bill, or to the bill from the same time last year.
How to read a gas meter?
Metric gas meters are read from left to right, reading the black and white digits only. Take a meter read and note the time you have taken the read. Take a read at the same time the next day. Subtract the previous read from the current read and you will have the gas used in cubic meters.
What is the billing period?
Billing period: The range of dates that the bill covers (e.g. 1 January 2018 – 1 March 2018). Opening balance: The amount that was owed, or in credit, when the previous bill was issued. Payments received: The amount that has been paid towards the account since the previous bill.
How much is the average gas bill?
The average annual residential gas bill was $712 in 2019, according to the most recent data from the American Gas Association. That’s about $59 per month.
Why is my gas bill so high?
Your bill may seem expensive, regardless of whether it’s higher or lower than average. That’s because the price you pay for natural gas depends on where you live and how much you use.
How can I lower my gas bill?
Some charges on your bill, such as local taxes, are beyond your control. However, you can save money by watching your gas usage or seeking help with payments. Here are a few ways to reduce your bill:
Natural Gas Components
Heat Value of Natural Gas
- The heat value of natural gas depends on how effective the thermal energy coming from the natural gas is. The heat content of natural gas is not related to the colour of the flame in the stove, nor to its colour or price. “A megajoule per cubic meter (MJ/m³) is a decimal multiple of a derived unit of specific energy, heating value, energy content, ...
Is The Heating Value of Natural Gas Decreasing?
- As time goes on, people will start to recognize that the heating value of natural gas is decreasing. It is not because of the quality they are receiving, but because the technology and heating systems become obsolete, thus the efficiency of these technologies will decrease. Season factors also affect the “feel” of a decrease in heating value. For example, even tap water is colder in wint…
Conclusion
- The heating value depends on 1. the components of the natural gas 2. the producers’ quality 3. and even the conditions of your home heating system