Exploring Synergistic GHG Emissions Mitigation Potential and Costs of Room Air Conditioners
These videos have been matched automatically. Contact us if they are not relevant.
These videos have been matched automatically. Contact us if they are not relevant.
View abstract on PubMed
Summary
This summary is machine-generated.This study shows that improving room air conditioning (RAC) refrigerant and energy efficiency can significantly cut global greenhouse gas (GHG) emissions. Implementing accelerated refrigerant transition and energy efficiency (ATE) measures offers substantial emission reductions and avoids global temperature rise.
Area Of Science
- Environmental Science
- Climate Change Mitigation
- Energy Efficiency
Background
- The global room air conditioning (RAC) sector is a significant contributor to greenhouse gas (GHG) emissions, encompassing both direct refrigerant leakage and indirect electricity consumption.
- China's dominance in global RAC manufacturing (80%) makes its policies crucial for climate mitigation efforts.
- Existing refrigerant and energy efficiency levels in 2021 are projected to result in substantial annual emissions under a Business-as-Usual (BAU) scenario.
Purpose Of The Study
- To evaluate the potential for synergistic reduction of direct and indirect GHG emissions from the global RAC sector.
- To compare three emission reduction scenarios: Business-as-Usual (BAU), Kigali Amendment compliant (KAE), and Accelerated Refrigerant Transition and Energy efficiency (ATE).
- To assess the cost-effectiveness of emission abatement measures and their impact on global surface temperature.
Main Methods
- Scenario analysis comparing BAU, KAE (10% energy efficiency improvement by 2025), and ATE (accelerated transition and efficiency).
- Cost assessment of refrigerant and efficiency measures for different export market groups based on Kigali Amendment classifications.
- Estimation of cumulative GHG emission reductions and avoided surface temperature rises for each scenario.
Main Results
- The BAU scenario predicts approximately 1 Gt CO2-eq average annual global RAC emissions from 2022-2060.
- KAE and ATE scenarios project cumulative emission reductions of 12.2 and 17.2 Gt CO2-eq, respectively, from China's RAC manufacturing.
- Both KAE and ATE present cost-effective abatement, with negative costs in key export markets and low average global costs, avoiding significant surface temperature rises.
Conclusions
- Accelerated refrigerant transition and energy efficiency improvements in the RAC sector offer substantial GHG emission reductions and contribute to climate change mitigation.
- Cost-effective abatement opportunities exist, particularly in export markets classified under A5II and A5I.
- International collaboration between China and importing nations is essential to enhance energy efficiency in traded RACs and achieve sustainable mitigation goals aligned with the Kigali Amendment.
These videos have been matched automatically. Contact us if they are not relevant.
These videos have been matched automatically. Contact us if they are not relevant.
Related Concept Videos
There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other experimentally determined enthalpy changes. Some reactions are difficult, if not impossible, to investigate and make accurate measurements for experimentally. And even when a reaction is not hard to perform or measure, it is convenient to be able to determine the heat involved in a reaction without having to perform an experiment.
This type of calculation...
Refrigerators or heat pumps are heat engines operating in a reverse direction. For a refrigerator, the focus is on removing heat from a specific area, whereas, for a heat pump, the focus is on dumping heat into one particular area. A refrigerator (or heat pump) absorbs heat Qc from the cold reservoir at Kelvin temperature Tc and discards heat Qh to the hot reservoir at Kelvin temperature Th, while work W is done on the engine’s working substance.
A household refrigerator removes heat from...
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
Past Periods of Warming and Cooling
In...
The free energy change for a process taking place with reactants and products present under nonstandard conditions (pressures other than 1 bar; concentrations other than 1 M) is related to the standard free energy change according to this equation:
where R is the gas constant (8.314 J/K·mol), T is the absolute temperature in kelvin, and Q is the reaction quotient. This equation may be used to predict the spontaneity of a process under any given set of conditions.
Reaction Quotient...
Air entrainment in concrete significantly enhances the material's durability, especially in environments subjected to freeze-thaw cycles. Introducing small air bubbles into the concrete mix acts as internal voids that accommodate the expansion of water when it freezes, thereby alleviating internal stress and preventing structural cracks. This function is crucial in climates with significant freezing and thawing, as it protects the concrete from repeated stresses that could lead to premature...
Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...