Source: https://guthlabs.ai/docs/instruments/diesel-cycle-efficiency-calculator/

instrument / verified-clean

# Diesel Cycle Efficiency Calculator

The current ledger marks this instrument verified clean within the source-bound verification corpus.

Status: **VERIFIED_CLEAN**Lifecycle: **verified-clean**

## Inspectable records

[01**Overview**Purpose and lifecycle](<https://guthlabs.ai/docs/instruments/diesel-cycle-efficiency-calculator/>)[02**Mechanism**Method and assumptions](<https://guthlabs.ai/docs/instruments/diesel-cycle-efficiency-calculator/mechanism/>)[03**Implementation**Binding and validation](<https://guthlabs.ai/docs/instruments/diesel-cycle-efficiency-calculator/implementation/>)[04**Qualification**Evidence and errata](<https://guthlabs.ai/docs/instruments/diesel-cycle-efficiency-calculator/qualification/>)

## Ledger state

The current ledger marks this instrument verified clean within the source-bound verification corpus.

**Area**: Thermodynamics, Fluids & Aero

**Tranche**: tranche-3

**Evidence ID**: t3-012

**Ledger rows**: 1

No ledger note is attached.

## Review findings

The efficiency formula is correct for the ideal, air-standard Diesel cycle with constant γ. The specification fails because it promises net work without defining or supplying the information needed to calculate it. The gamma default table is also underspecified: identify the working fluid, temperature basis, and default-selection rule.

### Formula and scope findings

- The thermal-efficiency formula is the standard air-standard ideal Diesel-cycle formula: η = 1 − [1/r^(γ−1)]·[(rc^γ−1)/(γ(rc−1))], provided r > 1, rc > 1, and γ > 1.

- The declared output 'net work' has no formula and cannot be computed from only r, rc, and γ; heat input, mass or working-fluid amount, and a thermodynamic state or energy scale are required.

- At rc = 1, the written expression contains 0/0 and is undefined; the limiting value must be explicitly implemented as η = 1 − 1/r^(γ−1).

### Unit assumptions

- r and rc are dimensionless ratios, entered as numeric values such as r = 18 rather than '18:1'.

- γ = cp/cv is dimensionless and must be appropriate to the assumed working fluid and temperature range; γ = 1.4 is the usual constant-air approximation.

- η is dimensionless and should be reported as a fraction or percentage with the display convention stated.

- Net work requires an energy basis such as J per cycle or J/kg; no such basis is specified.

## Boundary hardening

**BREAK_CLAIMED** · SELF_FLAGGED

The specification does not define net work because heat input, mass, and normalization are missing. It also permits singular or nonphysical inputs unless it explicitly rejects rc=1, rc<1, and r<=1; rc=1 produces a direct 0/0 evaluation.

## Errata and corrections

No applied erratum is attached to this unique-name record.

## Inspectable example

4 review vectors are recorded. One source-bound sample is shown below.

````
{
  "inputs": {
    "r": 16,
    "rc": 2,
    "gamma": 1.4
  },
  "expected_outputs": {
    "eta": 0.613805,
    "net_work": null
  },
  "working": "r^(γ−1) = 16^0.4 ≈ 3.031433, so 1/r^(γ−1) ≈ 0.329877. rc^γ = 2^1.4 ≈ 2.639016. [rc^γ−1]/[γ(rc−1)] = (2.639016−1)/(1.4×1) = 1.639016/1.4 ≈ 1.170726. η = 1 − (0.329877×1.170726) = 1 − 0.386195 ≈ 0.613805. Net work cannot be computed from the supplied inputs."
}
````

## Related workflows

[Engine Cycle Comparatorcompression](<https://guthlabs.ai/docs/instrument-workflows/engine-cycles/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json · VERIFIED_CLEAN`

- `evidence-tranche3/tranche3-results.json`

- `BOUNDARY_HAZARD_CATALOG.json`