Energy mass balanceCostingOther

Variable-speed rotary screw air compressor

Oil-injected variable-speed screw compressor on an industrial site, against a fixed-speed load/unload machine of the same FAD: free air delivery from the rated motor power (DOE / Lot 31 efficiency curves), specific power and energy at part load, recoverable heat, VSD saving, and the cost of compressed air per 1,000 Nm3 in constant EUR 2025.

Open Jack

Founder · OpenJack

Add to project

CurrencyEUR 2025
Battery limitinstalled
79 documented assumptions
Updated2 Nov 2026

Mass and energy balance

What the asset draws and delivers for the case and load you choose.

Reference case

Operating hours44.5 %

Hours a year the compressor runs (loaded or modulating). Default 3,900 h, the Lot 31 value for a 120 l/s VSD (Task 7 Table 2-11).

Flows

Annual quantities at the current usage. Band width: share of energy in; non-energy flows are not to scale.

Rated motor power

Nameplate power of the main drive motor. The FAD follows from it through the DOE efficiency curve and a 92 % motor efficiency. Default 37 kW, a common mid-size screw package. Catalogue machines sit inside the range (Atlas Copco GA22 VSD 22 kW; BOGE S-4 37 to 75 kW). The efficiency curve is extrapolated below about 5 kW (7.5 l/s), and the Lot 31 prices above 960 l/s (about 330 kW at 8 bar(g)).

Free air delivery at full load: — m3/min
Maximum air flow, normal: — Nm3/h
Full-load input power: — kW
Installed CAPEX: — EUR

CAPEX

Specific cost at this size, what backs it, and how it behaves with scale.

Specific CAPEX at this size

—

Reference size 47.1 kW

Fit on Lot 31 tables

CAPEX basis

Model value: Lot 31 price scaled with motor power. Customized: your own installed EUR/kW, used as is at every size; it is then no longer sourced by this calculator.

Specific installed CAPEX by rated motor power

Ex-factory
Installed· this figure
Fully financed

CAPEX at the battery limit—

Working capital, contingencyproject level

Included

Equipment
Installation, civil works and engineering

Not included

Working capital
Contingency

Added at project level

Working capital layer, from the project settings
Contingency, from the project settings

Project figures

Values passed to project mode when this asset is added to a project.

Variable-speed rotary screw air compressorConcept sketch, not to scale · drag to rotate

Electricity in: —
Compressed air (normal m3) outMain product: —
Recoverable low-grade heat (warm air or water up to 70 C) out: —
CAPEX to the battery limit: —
Fixed O&M: —
Variable O&M, excluding feedstocks: 0 EUR/year
Asset lifetime: 13 years

Cost of compressed air

A standalone indicator for a quick read. Project mode recomputes it for the whole system.

—

Capital cost component—
Maintenance component—
Air filter component—
Electricity component—

Linked to the balance above

Operating hours44.5 %

Hours a year the compressor runs (loaded or modulating). Default 3,900 h, the Lot 31 value for a 120 l/s VSD (Task 7 Table 2-11).

Discharge pressure

Working pressure at the package outlet. Sets the isentropic reference power: 4.73 kW/(m3/min) at 7 bar(g), 5.10 at 8, 6.57 at 13. Default 8 bar(g).

Average load

Average air demand as a percent of the VSD's maximum FAD. Default 70 %, the 25/50/25 % weighting of the DOE and Lot 31 test points (100/70/40 % flow). The slider stops at 30 %: below the 19 % minimum flow of the measured part-load line the VSD runs load/unload and the calculator refuses the case.

Electricity price

Default 0.18 EUR/kWh, Eurostat non-household H1 2026, band 500-2000 MWh, excluding VAT and recoverable taxes.

Gas price for the heat credit

Values the recovered heat as gas not burned in an 85 % efficient heater. Default 0.0616 EUR/kWh, Eurostat non-household H1 2026, band 10 000-100 000 GJ. Only the net variant of the cost uses it.

Real discount rate

Real rate: every cost is in constant EUR 2025. Default 4 %, the Lot 31 / MEErP life-cycle cost rate.

Economic lifetime

Years over which the CAPEX is annualised. Default 13 years, the Lot 31 product life for 120 l/s (10 to 15 years by class; DOE: 12.5 years). Maintenance stays spread over the 13-year product life.

Cost of compressed air by operating hours

Benchmarks

This model's figures against published references and reference cases.

Specific energy, kWh/Nm3

0.1 BEKO factsheet

0.12 BEKO factsheet

Full-load specific power, kW/(m3/min)

5.65 DOE Sourcebook 2016

6.71 DOE Sourcebook 2016

Cost of compressed air, EUR/1000 Nm3

6 BEKO factsheet

100 BEKO factsheet

Reference cases at this size and usage

All results

Every model output at the current settings, grouped, with the sensitivity charts.

54 outputs · 6 groups · 14 also shown above, dimmed

Cost of air

Cost of compressed air: ComputingEUR/1000 Nm3
Capital cost component: ComputingEUR/1000 Nm3
Maintenance component: ComputingEUR/1000 Nm3
Air filter component: ComputingEUR/1000 Nm3
Electricity component: ComputingEUR/1000 Nm3
Electricity share of the cost of air: Computing%
Cost of air net of heat credit: ComputingEUR/1000 Nm3
Heat credit: ComputingEUR/1000 Nm3
Cost of air, fixed-speed reference: ComputingEUR/1000 Nm3

Air and energy

Free air delivery at full load: Computingm3/min
Free air delivery at full load (l/s): Computingl/s
Maximum air flow, normal: ComputingNm3/h
Average air flow, normal: ComputingNm3/h
Annual compressed air delivered: ComputingNm3/year
Equivalent full-load hours: Computingh/year
Operating time share: Computing%
Full-load input power: ComputingkW
Average input power: ComputingkW
Annual electricity: ComputingMWh/year

Efficiency

Full-load specific power: ComputingkW/(m3/min)
Part-load specific power: ComputingkW/(m3/min)
Specific energy: ComputingkWh/Nm3
VSD part-load penalty: Computingratio
Isentropic reference power: ComputingkW/(m3/min)
Package isentropic efficiency (VSD, full load): Computingratio
Measured efficiency, Atlas Copco GA45VSD: Computingratio
DOE curve at the GA45VSD flow: Computingratio

VSD against fixed speed

VSD annual electricity saving: ComputingEUR/year
VSD electricity saving: ComputingMWh/year
VSD energy saving: Computing%
VSD extra CAPEX: ComputingEUR
VSD net annual benefit: ComputingEUR/year
Specific energy, fixed-speed reference: ComputingkWh/Nm3
Full-load specific power, fixed-speed reference: ComputingkW/(m3/min)
Package isentropic efficiency (fixed speed): Computingratio
Installed CAPEX, fixed-speed reference: ComputingEUR

Heat recovery

Recoverable heat per Nm3: ComputingkWh/Nm3
Recoverable heat: ComputingMWh/year
Recoverable heat rate: ComputingkW
Recoverable fraction of input power: Computing%
Unrecovered heat and losses: ComputingMWh/year
Heat credit: ComputingEUR/year

CAPEX and annual costs

Installed CAPEX: ComputingEUR
Specific installed CAPEX: ComputingEUR/kW
Purchase price per kW, EUR 2014: ComputingEUR/kW
Purchase price: ComputingEUR
Installation: ComputingEUR
List price: ComputingEUR
Capital recovery factor: Computing1/year
Annualised CAPEX: ComputingEUR/year
Maintenance: ComputingEUR/year
Air filters: ComputingEUR/year
Electricity cost: ComputingEUR/year
Total annual cost: ComputingEUR/year

Sensitivities

6 charts

Cost of air components vs operating hours

Specific energy vs average load: VSD against fixed speed

VSD saving vs average load

Specific power and specific CAPEX vs rated power

Specific energy and recoverable heat vs discharge pressure

Cost of air vs electricity price

Sources

79 documented assumptions · 9 sources

About

Calculator context

Sizes and costs an oil-injected rotary screw compressor package with a variable-speed drive (VSD), from the air intake to the package outlet at 7 to 13 bar(g). The dryer, receiver, network and its leaks stay outside. The size input is the rated motor power. The free air delivery (FAD, at 20 C and 1 bar(a)) follows from it: the package input power at full load is the rated power over a 92 % motor efficiency (DOE Sourcebook). The isentropic reference power of the DOE test method (10 CFR 431 Appendix A, p1 = 100 kPa, K = 1.400) is divided by the package isentropic efficiency of the DOE NOPR 2016 regression curve, which DOE transcribed from the EU Lot 31 database and which rises with flow. Because the efficiency depends on the flow it sets, the FAD is solved by Newton's method. At the defaults (37 kW, 8 bar(g)) this gives about 5.5 m3/min and 7.3 kW/(m3/min). The derivation reproduces the BOGE S-4 75 kW at -11 % on FAD. The FAD is converted to normal m3 (0 C, 1 atm) with a factor of 0.9196.

Three reference cases set the efficiency and the heat recovery: the DOE / Lot 31 curve with an air-cooled package, the same curve water-cooled, and the curve shifted by +1.7 % to pass through the measured Atlas Copco GA45VSD CAGI sheet (0.736 against 0.724 on the curve at 134 l/s). Part load follows a straight line, P/P_full = 0.07 + 0.93 x load, fitted on the six points of that sheet (residuals below 1.4 % of full power). The VSD weighted efficiency of the DOE curve is turned into a full-load value with the ratio 0.96 derived from the same line. Below 19 % of maximum flow, the lowest measured point, the VSD would cycle load/unload: the calculator refuses an average load under that, and the slider stops at 30 %.

The fixed-speed reference has the same FAD, sits on the DOE fixed-speed curve and draws 25 % of its full-load power unloaded (DOE: 15 to 35 %). DOE warns that this straight load/unload line underestimates real blowdown losses, so the VSD saving shown is conservative. At high load on small machines the VSD comes out worse, as DOE says it does near full output. That result is not clamped, and no payback is computed over a saving that can be negative. About 86.5 % of the input power ends up in the coolant (DOE: 80 to 93 %), and 85 % of it is recoverable on an air-cooled package (80 to 90 %) or 55 % on a water-cooled one (50 to 60 %). The result is low-grade heat (warm air or water up to 70 C) that can feed a heat pump or preheat boiler water, but cannot make steam.

The CAPEX is the Lot 31 end-customer purchase price of a 120 l/s VSD, EUR 13,462 in 2014 (which already includes the 45 % average discount on list price). This model maps 120 l/s at 8 bar(g) to 47.1 kW, and the price is scaled with motor power at exponent 0.91. The exponent is a log-log fit through that anchor on the Lot 31 price tables: it runs 21 % below the tables at 7.5 l/s and 19 % below at 960 l/s. Installation is 2.5 % of list. Everything is indexed to 2025 with the euro-area HICP (x 1.290). The result is about 390 EUR/kW installed at 37 kW, or 290 EUR 2014/kW on a purchase basis, inside Lot 31's 200 to 400 EUR/kW. Maintenance is 64 % of the list price over the 13-year product life, and filters cost 1.81 EUR 2014 per m3/h a year. The fixed-speed CAPEX is the VSD CAPEX over 1.298, the Lot 31 VS/FS ratio at 120 l/s. A customized installed EUR/kW replaces the model price at every size. Above 960 l/s (about 330 kW at 8 bar) the prices are extrapolated, and the efficiency curve is extrapolated below 7.5 l/s (about 5 kW).

The cost of air is annualised CAPEX at a real rate (4 %, Lot 31 / MEErP), plus maintenance, filters and electricity, over the normal m3 delivered. At the defaults (70 % load, 3,900 h, 0.18 EUR/kWh, Eurostat H1 2026) it comes to about 29 EUR/1000 Nm3, 85 % of which is electricity, at 0.137 kWh/Nm3 and 113 MWh a year. About 83 MWh of heat a year is recoverable. BEKO cites European Commission findings of 6 to 100 EUR per 1,000 m3, and 0.10 to 0.12 kWh/m3 for well laid-out stations. The heat credit, valued as gas not burned in an 85 % efficient heater, is reported as a separate net variant. Chain the electricity inlet to the site supply, and the recoverable heat (manual alignment) to a heat consumer such as an industrial heat pump.

Model

152 variables — inputs, calculations and outputs, with their dependencies.

152 variables shown of 152

Value	Unit	Depends on
1	—	—
37	kW	—
8	bar(g)	—
70	%	—
3900	h/year	—
0.18	EUR/kWh	—
0.0616	EUR/kWh	—
4	%	—
13	years	—
0	—	—
394	EUR/kW	—

Variable	Formula	Unit	Depends on
	`if((<=0)+(<=0)+(</*)+(>)+(<=0)+(>)+(<0)+(<0)+(<0)+(<)+(<=0)+(<)+(>)>0,1,0)`	—
	`+*`	kPa
	`/`	—
	`*`	l/s
	`/(-)(((+*)/)^((-)/)-)/`	kW/(m3/min)
	`if(==,/,)`	ratio
	`/*/`	l/s
	`ln(*)`	—
	`-(-ln()-ln((^++)/))/max(-(+)/(^+*+),)`	—
	`-(-ln()-ln((^++)/))/max(-(+)/(^+*+),)`	—
	`-(-ln()-ln((^++)/))/max(-(+)/(^+*+),)`	—
	`*`	m3/h
	`(/)*((+)/(+))`	ratio
	`*/`	kW
	`*`	ratio
	`(+*(-))`	kW
	`**`	MWh/year
	`(+)/`	%
	`if(==,(+)/,(+)/)`	%
	`/`	ratio
	`+*/`	ratio
	`/`	EUR2014/kW
	`clamp((/)^(-),,)*`	EUR/kW
	`/`	ratio
	`**///`	EUR/year

Variable	Formula	Unit	Depends on
	`/(-)(^((-)/)-)/`	kW/(m3/min)
	`/`	kW
	`/(/(*))`	ratio
	`(ln()^+ln()+)/`	ratio
	`(^++)/*`	ratio
	`*/`	m3/min
	`*/`	l/s
	`*`	Nm3/h
	`/`	kW/(m3/min)
	`ln()^+ln()+`	ratio
	`/`	kW/(m3/min)
	`*`	Nm3/h
	`*`	h/year
	`/*`	%
	`(+(-)*)/`	ratio
	`(+(-))`	kW
	`*`	kW/(m3/min)
	`/max(,)`	kWh/Nm3
	`/max(,)`	kWh/Nm3
	`**`	MWh/year
	`-`	MWh/year
	`/max(,)*`	%
	`**`	EUR/year
	`**`	%
	`**`	kW
	`**`	MWh/year
	`**`	kWh/Nm3
	`-`	MWh/year
	`**/`	EUR/year
	`if(>=,,)`	EUR/kW
	`*`	EUR
	`/`	EUR
	`-`	EUR
	`/`	EUR
	`//`	EUR/kW
	`*/`	EUR
	`-`	EUR
	`if(<,/,((+)^)/max((+*)^-,))`	1/year
	`*`	EUR/year
	`**/`	EUR/year
	`**`	EUR/year
	`**`	EUR/year
	`+++`	EUR/year
	`*`	Nm3/year
	`/max(,)*`	EUR/1000 Nm3
	`/max(,)*`	EUR/1000 Nm3
	`/max(,)*`	EUR/1000 Nm3
	`/max(,)*`	EUR/1000 Nm3
	`+++`	EUR/1000 Nm3
	`/max(,)*`	%
	`/max(,)*`	EUR/1000 Nm3
	`-`	EUR/1000 Nm3
	`(+++)/max(,)`	EUR/1000 Nm3
	`-*-(-)`	EUR/year

Assumptions

79 assumptions used in the calculations

Protects divisions against a zero denominator.
Market range Not applicable (numerical parameter).
0
Numerical guard.
Unit value used in fractions and in the CAPEX basis switch.
Market range Exact.
1
Arithmetic.
Takes the midpoint of a published range, and the derivative of the efficiency curve.
Market range Exact.
2
Arithmetic.
Percent scale, and the 100 acfm basis of the CAGI specific power.
Market range Exact.
100
Arithmetic.
Converts percent inputs to fractions.
Market range Exact.
0.011/%
Unit conversion.
Caps operating hours and gives the operating time share.
Market range 8760 (8784 in a leap year).
8760h/year
Calendar convention.
Converts MWh to kWh.
Market range Exact.
1000kWh/MWh
Unit conversion.
Converts kWh to MWh.
Market range Exact.
0.001MWh/kWh
Unit conversion.
Expresses costs per 1,000 Nm3.
Market range Exact.
1000Nm3/(1000 Nm3)
Unit convention.
Converts the reference temperatures to kelvin.
Market range Exact.
273.15K
Unit conversion.
Converts the discharge gauge pressure to kPa.
Market range Exact.
100kPa/bar
Unit conversion.
Turns kPa x m3/min (kJ/min) into kW, and m3/min into l/s.
Market range Exact.
60s/min
Unit conversion.
Converts m3/min to m3/h.
Market range Exact.
60min/h
Unit conversion.
Converts m3/min to l/s, the flow unit of the DOE and Lot 31 curves.
Market range Exact.
1000l/m3
Unit conversion.
Converts the 125 psig test pressure of the GA45VSD CAGI sheet.
Market range Exact to 7 digits.
6.894757kPa/psi
Unit conversion.
Converts the CAGI sheet flows to m3/min.
Market range Exact to 6 digits.
0.028317(m3/min)/acfm
Unit conversion.
Converts the GA45VSD flow (acfm) to the l/s of the DOE curve.
Market range 0.4719 exact.
0.472(l/s)/acfm
DOE NOPR 2016
Exponent of the isentropic reference power.
Market range 1.40 for dry air near ambient.
1.4
DOE test procedure
Inlet pressure of the isentropic reference; the discharge pressure is this plus the gauge pressure.
Market range Fixed by the test method.
100kPa
DOE test procedure
FAD reference temperature, used to convert FAD to normal m3.
Market range ISO 1217 reference.
20C
Atlas Copco wiki
FAD reference pressure.
Market range ISO 1217 reference.
1bar(a)
Atlas Copco wiki
Normal-m3 reference temperature.
Market range DIN 1343 normal state.
0C
Atlas Copco wiki
Normal-m3 reference pressure. With the three other reference values it gives a FAD-to-Nm3 factor of 0.9196.
Market range 1.013 to 1.01325 bar(a).
1.01325bar(a)
Atlas Copco wiki
Fixed-speed efficiency curve, ln(Q)^2 coefficient.
Market range Regression on the Lot 31 / CAGI database; individual products scatter around it.
-0.00928
DOE NOPR 2016 Table I.1
Fixed-speed efficiency curve, ln(Q) coefficient.
Market range Regression on the Lot 31 / CAGI database; individual products scatter around it.
0.139
DOE NOPR 2016 Table I.1
Fixed-speed efficiency curve, constant coefficient.
Market range Regression on the Lot 31 / CAGI database; individual products scatter around it.
0.271
DOE NOPR 2016 Table I.1
Variable-speed weighted efficiency curve, ln(Q)^2 coefficient.
Market range Regression on the Lot 31 / CAGI database.
-0.0155
DOE NOPR 2016 Table I.1
Variable-speed weighted efficiency curve, ln(Q) coefficient.
Market range Regression on the Lot 31 / CAGI database.
0.216
DOE NOPR 2016 Table I.1
Variable-speed weighted efficiency curve, constant coefficient.
Market range Regression on the Lot 31 / CAGI database.
0.00905
DOE NOPR 2016 Table I.1
Turns the weighted VSD efficiency of the DOE curve into a full-load efficiency.
Market range No independent range cited.
0.96ratio
Derived from CAGI data
Share of full-load power a VSD still draws at zero flow, on its part-load line.
Market range No independent range cited.
0.07ratio
Fit on CAGI sheet
Power of the fixed-speed reference while unloaded, in a straight load/unload line. DOE warns this line underestimates real load/unload power (blowdown), so the VSD saving is conservative.
Market range 15 to 35 % (DOE).
25%
DOE Sourcebook 2016
Package input power at full load = rated motor power / 0.92.
Market range No independent range cited.
0.92ratio
DOE Sourcebook 2016
Measured package specific power, used for the calibrated case.
Market range One product.
20.4kW/100 acfm
CAGI sheet
Pressure of the CAGI measurement, for its isentropic reference power.
Market range One product.
125psig
CAGI sheet
Flow at which the measured efficiency and the DOE curve are compared (134 l/s).
Market range One product.
284acfm
CAGI sheet
Lowest flow of the measured part-load line: below 19 % of maximum flow the calculator refuses the case (the machine would run load/unload).
Market range About 20 % (DOE Sourcebook).
55acfm
CAGI sheet
Reference case 1: DOE / Lot 31 curve, air-cooled heat recovery.
Market range Not applicable.
1
Selector.
Reference case 2: DOE / Lot 31 curve, water-cooled heat recovery.
Market range Not applicable.
2
Selector.
Reference case 3: DOE / Lot 31 curve calibrated on the Atlas Copco GA45VSD CAGI sheet, air-cooled.
Market range Not applicable.
3
Selector.
Starting guess of the package efficiency.
Market range Not applicable (numerical parameter).
0.7ratio
Numerical seed.
Keeps the Newton denominator positive.
Market range Not applicable (numerical parameter).
0.1ratio
Numerical guard.
Cost anchor of the scaling law.
Market range The Lot 31 affine fit over 7.5-960 l/s gives 13,894 at 120 l/s (+3 %).
13462EUR2014
Lot 31 Task 7
Fixed-speed price at the same anchor; the VS/FS ratio 1.298 prices the fixed-speed reference.
Market range VS/FS ratio from the affine fits: 1.13 at 7.5 l/s, 1.33 at 960 l/s.
10372EUR2014
Lot 31 Task 7
Reference size of the scaling law.
Market range Not applicable.
47.1kW
Derived from the Lot 31 anchor
Economy of scale of the package price with motor power.
Market range The Lot 31 prices give a local exponent of 0.33 at 7.5 l/s rising to 0.98 at 960 l/s.
0.91
Fit on Lot 31 tables
Rebuilds the list price, the basis of Lot 31's installation and maintenance costs.
Market range Discounts vary by channel; 45 % is Lot 31's average.
0.55ratio
Lot 31 Task 7
Floor of the model purchase price per kW (bites nowhere on the 5-500 kW slider: the model runs from 231 to 350).
Market range 200 to 400 EUR/kW.
200EUR2014/kW
Lot 31 Task 2
Ceiling of the model purchase price per kW (bites nowhere on the slider).
Market range 200 to 400 EUR/kW.
400EUR2014/kW
Lot 31 Task 2
Installation, as a share of list price (4.5 % of the purchase price).
Market range 2 to 3 % of list.
2.5%
Lot 31 Task 7
Life-cycle maintenance, spread over the 13-year Lot 31 product life.
Market range 60 to 70 % of list.
64%
Lot 31 Task 7
Yearly filter cost per m3/h of FAD capacity.
Market range 1 to 4 EUR/(m3/h)/yr, falling with size.
1.81EUR2014/(m3/h)/yr
Lot 31 Task 7
Physical service life of the package: spreads the life-cycle maintenance, and is the replacement life exported to project mode.
Market range 10 to 15 years (Lot 31); 12.5 years (DOE).
13years
Lot 31 Task 7
Price year of the Lot 31 costs.
Market range Official statistic.
99.81index
Eurostat
Price year of the calculator (constant EUR 2025).
Market range Official statistic.
128.75index
Eurostat
Low end of the heat available in the coolant.
Market range 80 to 93 %.
80%
DOE Sourcebook 2016
High end of the heat available in the coolant.
Market range 80 to 93 %.
93%
DOE Sourcebook 2016
Air-cooled recovery, low end.
Market range 80 to 90 %.
80%
DOE Sourcebook 2016
Air-cooled recovery, high end.
Market range 80 to 90 %.
90%
DOE Sourcebook 2016
Water-cooled recovery, low end.
Market range 50 to 60 %.
50%
DOE Sourcebook 2016
Water-cooled recovery, high end.
Market range 50 to 60 %.
60%
DOE Sourcebook 2016
Gas heater that the recovered heat displaces.
Market range No independent range cited.
0.85ratio
DOE Sourcebook 2016
Cross-check curve of the scaling law: the power law used here sits 21 % below it at 7.5 l/s, 0.2 % below at 60 l/s, 3 % below at 120 l/s (the affine fit itself is 3 % above the printed 13,462) and 19 % below at 960 l/s. Above 960 l/s (about 330 kW at 8 bar) both are extrapolations.
Market range Not applicable.
—EUR2014
Lot 31 fit
Context only: the purchase-price ratio at 120 l/s (1.298) is what the calculator uses.
Market range Not applicable.
1.5ratio
Lot 31 Task 7
Not used: the calculator refuses an average load under the 19 % minimum flow of the measured part-load line, where the VSD would cycle; the load slider stops at 30 %.
Market range 10 to 15 %.
12%
DOE Sourcebook 2016
Benchmark of the full-load specific power (at 100 psig, just under the 7-13 bar slider).
Market range 5.65 to 6.71 kW/(m3/min).
5.65kW/(m3/min)
DOE Sourcebook 2016
Benchmark of the full-load specific power.
Market range 5.65 to 6.71 kW/(m3/min).
6.71kW/(m3/min)
DOE Sourcebook 2016
Benchmark of the specific energy.
Market range 0.10 to 0.12 kWh/m3.
0.1kWh/Nm3
BEKO factsheet
Benchmark of the specific energy.
Market range 0.10 to 0.12 kWh/m3.
0.12kWh/Nm3
BEKO factsheet
Benchmark of the cost of air (low end).
Market range 6 to 100 EUR/1000 m3; 15 to 20 for efficient larger stations.
6EUR/1000 Nm3
BEKO factsheet
Benchmark of the cost of air (high end).
Market range 6 to 100 EUR/1000 m3.
100EUR/1000 Nm3
BEKO factsheet
Check of the sheet's specific power.
Market range One product.
58kW
CAGI sheet
Default of the operating hours slider.
Market range 1,100 to 6,000 h/yr.
3900h/year
Lot 31 Task 7
Default of the average load slider.
Market range Site-specific.
70%
Lot 31 Task 7
Default of the electricity price slider; an H1 2026 price taken as is against EUR 2025 costs (no deflation over half a year).
Market range Site-specific.
0.18EUR/kWh
Eurostat
Default of the gas price that values the recovered heat.
Market range Site-specific.
0.0616EUR/kWh
Eurostat
Default real discount rate: every cost is in constant EUR 2025.
Market range No independent range cited.
4%
Lot 31 / MEErP
Package boundary: oil-injected rotary screw package, motor, VSD and cooler, from air intake to discharge. The dryer, receiver, network leaks and pressure drop are outside. The FAD is derived from the rated motor power through the reference efficiency curves, not read from a product sheet; checked against the BOGE S-4 75 kW, it comes out 11 % low. The efficiency curve is extrapolated below 7.5 l/s (about 5 kW) and the CAPEX above 960 l/s (about 330 kW at 8 bar).
Market range Not applicable.
—
Method
The fixed-speed load/unload reference is sized for the same FAD as the VSD, sits on the DOE fixed-speed curve, and unloads at 25 % of its full-load power. At or near full output the VSD draws more than the fixed-speed machine (DOE): the saving goes negative at high load and is not clamped.
Market range Not applicable.
—
Method