Total Equivalent Warming Impact In Offshore Logistics (TEWI)
At the design stage, this guide offers a standardised approach for determining Total Equivalent Warming Impact (TEWI) for new stationary refrigeration and air conditioning systems.
Its goal is to help facility operators, designers, and industry practitioners analyse the environmental consequences of various technological solutions for meeting their HVAC&R needs.
What is TEWI?
The total related emissions of greenhouse gas during the operation of the equipment and the disposal of the operating fluids at the end-of-life are based on the total related emissions of greenhouse gases during the operation of the equipment and the disposal of the operating fluids at the end-of-life.
TEWI considers both direct fugitive emissions as well as indirect emissions caused by the energy used to operate the device.
TEWI is expressed in kilograms of carbon dioxide equivalent.
What is LCCP?
LCCP varies from TEWI in that it includes several things that are not included in TEWI.
These are the greenhouse gas emissions associated with the embodied energy of equipment and fluids, as well as the direct fugitive emissions during their manufacturing.
Pearson discovered that fugitive emissions and embodied energy for the manufacturing of R-134a and R-404A accounted for less than 1% of the GWP value, far less than the uncertainty in an LCCP estimate for stationary equipment.
The Air Conditioning, Heating, and Refrigeration Technology Institute (AHRTI) have created a standardised approach for calculating the LCCP of stationary refrigeration and air conditioning equipment.
For further information on their model, contact AHRTI.
What is the relevance of TEWI?
The Kyoto Protocol’s need to limit greenhouse gas emissions necessitates continual careful analysis and review of energy-consuming activities.
Multiple greenhouse gases can be released as a result of a variety of activities.
TEWI is a method for calculating total relevant greenhouse gas emissions for specific applications, such as refrigeration and air conditioning in this example.
It’s worth noting that the electricity used to power stationary refrigeration and air conditioning equipment has the greatest impact on global warming.
Approximately 45,000 GWh or 21.9 percent of all energy was sent out in Australia in 2006, resulting in as much as 7% of all greenhouse gas emissions in Australia in that year, or 40 Mt of CO2-e (including mobile air conditioning and refrigeration).
What are the limitations?
The TEWI estimates are based on a variety of assumptions concerning equipment performance and usage patterns, refrigerant characteristics, and power generating efficiency.
There will be a lot of ambiguity in the numbers utilised.
The GWP values of refrigerants, in particular, are highly uncertain. It’s vital to remember that modest changes in TEWI aren’t always significant.
There are recommendations for sensitivity analysis and comparative validity, which should be kept in mind if TEWI is to be a successful design tool.
It is important to note that the TEWI comparison must be made between systems of equivalent responsibility and function in order to be meaningful.
Comparing the TEWI values of a residential refrigerator with a supermarket display cabinet, for example, serves no practical purpose.
In conclusion, we have discussed the total equivalent warming impact in offshore logistics as well as what is TEWI.
We also talked about what is LCCP as well as what is the relevance of TEWI.
Finally, we touched upon the limitations of TEWI.