Life Cycle Climate Performance

Key takeaways

Life Cycle Climate Performance belongs to earth science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Life Cycle Climate Performance to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Life Cycle Climate Performance from memory before moving on to harder problems.

Reference excerpt

Life Cycle Climate Performance (LCCP) is an evolving method to evaluate the carbon footprint and global warming impact of heating, ventilation, air conditioning (AC), refrigeration systems, and potentially other applications such as thermal insulating foam. It is calculated as the sum of direct, indirect, and embodied greenhouse gas (GHG) emissions generated over the lifetime of the system "from cradle to grave," i.e. from manufacture to disposal. Direct emissions include all climate forcing effects from the release of refrigerants into the atmosphere, including annual leakage and losses during service and disposal of the unit. Indirect emissions include the climate forcing effects of GHG emissions from the electricity powering the equipment. The embodied emissions include the climate forcing effects of the manufacturing processes, transport, and installation for the refrigerant, materials, and equipment, and for recycle or other disposal of the product at end of its useful life. LCCP is more inclusive than previous metrics such as Total Equivalent Warming Impact (TEWI), which considers direct and indirect GHG emissions but overlooks embodied emissions, and Life Cycle Warming Impact (LCWI), which considers direct, indirect and refrigerant manufacturing emissions but overlooks appliance manufacturing, materials, transport installation and recycle. Enhanced and Localized Life Cycle Climate Performance (EL-LCCP) is the latest and most comprehensive carbon metric and takes into account: 1) real-world operating conditions, including the actual hour-by-hour carbon intensity of electricity generation, transmission, and distribution, which is degraded by high ambient temperature; 2) specific conditions of AC condensers located within urban heat islands and in locations with poor air circulation (mounted to close to buildings, clustered and stacked), as well of refrigerators and refrigerated display cases located against walls, inside cabinets, and other locations that compromise energy efficiency; 3) local climate conditions, such as higher ambient temperature at the location of the equipment than at the weather monitoring stations, which typically are located away from human influence. TEWI was developed by experts at Oak Ridge National Laboratory under contract from Allied Signal (now Honeywell) and was a step forward as a complement and enhancement of previous metrics like coefficient of performance (COP) and Seasonal Energy Efficiency Ratio (SEER), which consider energy use but not global warming potential (GWP) and emissions of refrigerants.

Development LCCP was developed in 1999 by an expert working for the United States Environmental Protection Agency and serving on the Montreal Protocol Technology and Economic Assessment Panel (TEAP), who noticed that TEWI ignored the substantial emissions of unwanted hydrofluorocarbon (HFC)-23 byproducts of hydrochlorofluorocarbon (HCFC)-22 production. The byproduct emissions increased the climate forcing GWP of ozone-depleting HCFC-22 by up to 20%, depending on the efficiency of the chemical manufacturing process. At the time, all fluorocarbon manufacturers merely discharged the hazardous HFC-23 chemical waste to the atmosphere. In 2005, a joint committee of the United Nations Intergovernmental Panel on Climate Change (IPCC) and the TEAP endorsed the LCCP metric for use in evaluating low carbon refrigeration and AC equipment.

Calculation The equations to calculate LCCP for mobile and stationary equipment are similar, with the exception that the calculation for mobile equipment includes the energy consumption necessary to transport the weight of the AC in the vehicle, whether in operation or not.

L C C P = D i r e c t E m i s s i o n s + I n d i r e c t E m i s s i o n s + E m b o d i e d E m i s s i o n s {\displaystyle LCCP=DirectEmissions+IndirectEmissions+EmbodiedEmissions}

D i r e c t E m i s s i o n s = C ∗ ( L ∗ A L R + E O L ) ∗ ( G W P + A d p . G W P ) {\displaystyle DirectEmissions=C*(L*ALR+EOL)*(GWP+Adp.GWP)}

I n d i r e c t E m i s s i o n s = L ∗ A E C ∗ E M + Σ ( m ∗ M M ) {\displaystyle IndirectEmissions=L*AEC*EM+\Sigma (m*MM)}

E m b o d i e d E m i s s i o n s = Σ ( m r ∗ R M ) + C ∗ ( 1 + L ∗ A L R ) ∗ R F M + C ∗ ( 1 − E O L ) ∗ R F D {\displaystyle EmbodiedEmissions=\Sigma (mr*RM)+C*(1+L*ALR)*RFM+C*(1-EOL)*RFD}

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Life Cycle Climate Performance

Start with the simplest possible case. Write down what Life Cycle Climate Performance claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In earth science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Life Cycle Climate Performance before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Life Cycle Climate Performance ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Life Cycle Climate Performance

In research: Life Cycle Climate Performance appears in earth science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Life Cycle Climate Performance in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Life Cycle Climate Performance is common in secondary-school and first-year university syllabi. It links to neighbouring topics Heating, ventilation, and air conditioning, so understanding it makes those chapters shorter.
In everyday life: Look for Life Cycle Climate Performance outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

How to study Life Cycle Climate Performance in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Life Cycle Climate Performance means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Life Cycle Climate Performance out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Life Cycle Climate Performance in simple terms?

Life Cycle Climate Performance (LCCP) is an evolving method to evaluate the carbon footprint and global warming impact of heating, ventilation, air conditioning (AC), refrigeration systems, and potentially other applications such as thermal insulating foam. It is calculated as the sum of direct, in…

Why does Life Cycle Climate Performance matter?

Because it connects several earth science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Life Cycle Climate Performance?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Life Cycle Climate Performance.