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Research draft

efficiency

vr.tr.efficiency · XCT.REL

Let an agent state efficiency with its output, input, boundary and method, and not confuse it with effectiveness or productivity.

Thing Registry Cross-cutting context

Research draft, second pass

A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.

written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify

Researched by: Claude

Purpose and description

Let an agent state efficiency with its output, input, boundary and method, and not confuse it with effectiveness or productivity.

The ratio of useful output to input for a process, device or organisation, expressed as a fraction or percentage, such as energy efficiency or resource-use efficiency.

What it is for: Comparing how well resources are turned into results, for design, policy and management.

It can be measure it, under a stated method; compare it, between options defined the same way; improve it, by reducing losses; label it, as in energy labels.

Distinguishing features

Output over input, a ratio

Needs a defined boundary and method

Different from effectiveness, which is about achieving goals

Some metrics invert the ratio, such as PUE

What it looks like

A percentage or ratio on a label, datasheet or report.

Physical character

range: 0-100 percent - energy conversion cannot exceed 100 percent; coefficient of performance can exceed 1

How it is recognised

Percentages such as 95 percent boiler efficiency

Ratios such as PUE for data centres

Energy labels with classes

Related models

is a kind of - output to input

ratio

is confused with - goal achievement

effectiveness

is measured by - standard classes

energy label

relates to - energy efficiency

energy

In practice

Families and kinds

energy and power efficiency

computational efficiency

resource-use efficiency, such as nitrogen or carbon use

organisational and industrial efficiency

data centre infrastructure efficiency

Standards and regulation

EU Energy Labelling Regulation 2017/1369 and ecodesign rules

ISO 50001 energy management

ISO/IEC 30134-2 PUE

Failure modes and hazards

Comparing efficiencies with different boundaries

Rebound effects that increase total use

Optimising efficiency at the expense of safety or quality

Also called

organizational effectivenesspower efficiencydata center infrastructure efficiencycomputational efficiencynitrogen-use efficiencycarbon-use efficiencyindustrial efficiencymaterial efficiencyresource efficiencymachine operator efficiencycode densityeco-efficiencyeducational efficiencyseasonal energy efficiency ratioefficiency ratioecological efficiencyspectral efficiencyorganizational efficiencyoperational efficiencyphotosynthetic efficiencyPlant efficiencyutilization factorwater efficiencyatom economycompression efficiencyEuropean seasonal energy efficiency ratioSoil Use Efficiency

Where this came from

wikidata · CC0 1.0

Source repository Registry entry point

Also registered as vr.tr.efficiency-cognition

Drafted structure

Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.

Definition Output, input, boundary.

Efficiency means nothing without its terms.

Terms

What counts as output and input.

Terms

Output and input defined.

  1. What counts as useful output and as input here? definition
  2. Where is the system boundary drawn? boundary

Metric

Percentage, ratio, inverted metric.

Metric

The metric used.

  1. Which metric is used, and is higher better? definition
  2. Which standard defines it? provenance
Measurement How it was measured.

Test conditions change results.

Method

Test procedure.

Method

Test procedure.

  1. Under which test conditions was it measured? provenance
  2. How close are those to real use? boundary

Uncertainty

Error.

Uncertainty

Measurement uncertainty.

  1. What is the uncertainty of the value? measurement
  2. Was it independently verified? provenance
Comparison Comparing options.

Comparisons need identical definitions.

Benchmarks

Typical values.

Benchmarks

Typical values.

  1. What value is typical or best in class? measurement
  2. Are they defined the same way? boundary

Labels

Energy labels.

Label class

Label class.

  1. Which label class does this product have? provenance
  2. What does it mean in annual use? measurement
Improvement Getting better.

Improvements should reduce total resource use.

Losses

Where input is lost.

Loss analysis

Main losses.

  1. Where are the largest losses? measurement
  2. Which measures reduce them? action

Rebound

Total use.

Rebound

Rebound effects.

  1. Could efficiency gains increase total use? boundary
  2. How should that be measured? measurement

What the second pass must settle

  • Should kinds of efficiency be separate entries?
  • How should boundaries be recorded for every efficiency value?
  • How should agents explain rebound effects?
Draft as JSON