ENERGY SAVING · ENGLISH CASE LIBRARY
All 88 English cases cover operating diagnosis, baselines, field comparisons and simulation. Each case states what the evidence supports.
The Korean library contains 88 cases: CASE01–82 are linked to the current Korean book; CASE83–88 are website extensions. This English edition contains all 88 cases. Browse the full Korean library ↗
88 English cases
CASE01 · Manufacturing
PotentialProduction-weight baselines explain electricity use in SHAFT heat treatment and tempering. Comparable 432 kg batches reveal opportunities to reduce operating variability and excessive processing time.
CASE02 · Manufacturing
PotentialCompare E5 RETAINING PLATE batches at the same weight and use separate weighted least squares baselines for ACF#3 and two tempering furnaces. The initial scenario targets excessive consumption without treating the estimate as verified savings.
CASE03 · Manufacturing
PotentialDaily casting data show substantial variation in operating time, yield and electricity intensity. A proportional scenario evaluates increasing good-product yield while holding melting energy constant.
CASE04 · Manufacturing
PotentialSeparate gas baselines for two melting furnaces and an electricity baseline for casting machine #8 evaluate the effect of higher daily throughput and larger batches under comparable process conditions.
CASE05 · Manufacturing
PotentialA regression baseline links former electricity consumption to downtime and production weight. The analysis evaluates lower idle time and larger production lots as a route to improved energy intensity.
CASE06 · Manufacturing
Field diagnosisIndividual equipment metering separates production machines from cooling, HVAC and compressed-air loads. One-minute profiles identify priorities after a large year-on-year increase in factory electricity use.
CASE07 · Manufacturing
SimulationHistorical glass-sintering data were normalized by the main sintering profiles. Reassigning production to better-performing furnaces was simulated while keeping loading and process conditions comparable.
CASE08 · Manufacturing
Annualized estimateAHU operating data revealed overlapping chilled-water and steam valve operation. Seasonal changes were applied first to general-purpose AHUs, while cleanroom systems were treated separately to protect production conditions.
CASE09 · Manufacturing
Operating guideHourly operating records support efficient-unit priority, monthly staging and chilled-water setpoints for 5°C and 12°C systems. Pump conditions are standardized so that equipment performance can be compared fairly.
CASE10 · Manufacturing
PotentialAnnual cooling-plant records reveal equipment efficiency differences, surplus operating capacity and low chilled-water temperature differences. A combined scenario estimates savings across chillers and auxiliaries.
CASE11 · Manufacturing
Reported field resultA two-year semiconductor/display program first applied utility improvements at a demonstration plant and then expanded real-time performance diagnosis and operating guidance across six factories.
CASE12 · Manufacturing
PotentialSeasonal and one-minute records connect COP, staging, AHU filter pressure and compressor unloading. The report estimates utility savings while keeping production-equipment electricity outside the improvement boundary.
CASE13 · Manufacturing
PotentialSeasonal comparisons of low-/high-temperature cooling and compressed dry air use best-performing operation as a benchmark. Staging and bypass analysis identifies a multi-site utility improvement portfolio.
CASE14 · Manufacturing
PotentialA proposal examines relationships among utility demand, supply, staging, setpoints and equipment performance after common operating improvements have already been implemented.
CASE15 · Manufacturing
PotentialAnnual CDA and cooling records support a staged proposal: an initial compressor improvement followed by additional utility optimization. Sensor consistency is a prerequisite for credible performance comparisons.
CASE16 · Manufacturing
PotentialPower, airflow, pressure, IGV/BOV behavior and process-level demand are analyzed together. A small UPI improvement represents a meaningful cost opportunity in a large compressed-air system.
CASE17 · Manufacturing
PotentialA one-week field campaign compares system power, airflow, pressure and required units. The proposal uses UPI and supply-demand balance to define operating scenarios for a large turbo-compressor system.
CASE18 · Manufacturing
PotentialLow- and high-pressure compressor systems were benchmarked using specific electricity consumption, unit staging, pressure and BOV/IGV behavior. Additional savings opportunities were identified even though baseline performance was already better than the peer average.
CASE19 · Manufacturing
Field diagnosisRepresentative seasonal records compare cooling, compressed air and steam. Equipment efficiency differences are evaluated alongside abnormal flow measurements before savings priorities are assigned.
CASE20 · Manufacturing
TargetCharge-level electricity is matched with operating logs to evaluate preheating, melting, waiting and tapping. A first-stage operating target is defined without mixing raw and filtered observation averages.
CASE21 · Manufacturing
PotentialA forty-compressor proposal combines gas demand, equipment intensity, load and operating conditions to support efficient-unit selection and required-unit staging across an oxygen-production utility.
CASE22 · Manufacturing
Field diagnosisSeasonal blower data separate equipment differences from weather effects. Pressure margins, duct losses and unusual IGV readings are investigated while avoiding an unsupported filter-efficiency claim.
CASE23 · Manufacturing
PotentialTwo fumers differ in feed mix and energy intensity. A proposal combines slag/feed redistribution with real-time flue-gas O₂/CO feedback to reduce excessive fuel and oxygen input.
CASE24 · Manufacturing
TargetLimited monthly electricity records, low chilled-water ΔT and compressor unloading evidence support a utility optimization target. A monthly factor adjusts expected utility use to production-equipment electricity.
CASE25 · Manufacturing
PotentialA graphite and battery-materials factory uses short-interval power, flow and pressure measurements to evaluate large base-load compressors and smaller demand-following units. The proposal combines essential metering with real-time operating guidance.
CASE26 · Water & wastewater
Field comparisonFive-minute and monthly operating data were used to compare wastewater throughput and electricity before and after inlet-pump replacement. Flow-normalized performance improved while the reported treatment capacity remained broadly comparable.
CASE27 · Water & wastewater
PotentialSeasonal ten-minute data across intake, treated-water transmission and booster systems support efficient pump selection, demand-based staging and reservoir scheduling.
CASE28 · Power generation
PotentialGeneration-normalized auxiliary indicators identify differences between feedwater, condensate and seawater pumps and forced/induced-draft fans. The proposal connects benchmarking to dispatch and setpoint guidance.
CASE29 · Buildings
PotentialAn existing commercial-building audit for a historical LEED-EB submission combines walk-through engineering, BEMS validation, weather analysis and equipment diagnosis with economics and an implementation plan.
CASE30 · Buildings
Engineering frameworkCondition assessment and a DOE-2.1E baseline model support retrofit alternatives for the envelope, lighting, HVAC and plant. Life-cycle cost links initial investment to annual energy cost.
CASE31 · Buildings
PotentialMulti-year utility records, weather relationships and on-site measurements connect actual operating losses to controls, equipment improvements and a monthly savings-settlement method.
CASE32 · Buildings
Measured-data diagnosisA twelve-month metered series is reorganized by month, day type and hour to investigate night loads, winter HVAC and peak-demand priorities. Estimated end uses remain distinct from measured whole-building electricity.
CASE33 · Buildings
Engineering frameworkAn end-use hierarchy links building demand and supply to equipment, management variables and operating guidance, turning consumption displays into a repeatable diagnostic process.
CASE34 · Buildings
TargetA BPOS proposal connects existing BEMS data, design-load review, measurement checks and real-time operating guidance for a supertall mixed-use building. Seasonal optimization is designed as a continuing process.
CASE35 · Buildings
SimulationA historical ASHRAE 90.1-2004 Appendix G comparison models the proposed mixed-use design against four rotated baseline buildings. District-heat absorption cooling improves cost performance while increasing site energy.
CASE36 · Buildings
SimulationAn 8,760-hour model translates envelope, internal gains, schedules and HVAC/plant assumptions into design-stage energy demand, primary energy and emissions by facility and season.
CASE37 · Renewable energy
SimulationWeather data and solar geometry construct horizontal and tilted-surface radiation over 8,760 hours. Tilt, azimuth and available surfaces are compared before downstream PV generation and economic modeling.
CASE38 · Data centers
Pilot result & potentialCenter and floor-level PUE is traced to cooling operation and equipment condition. A measured fan pilot is kept separate from the estimated benefits of larger rollout and free-cooling investment.
CASE39 · Data centers
TargetA multi-center performance-improvement proposal integrates facility, IT and cooling electricity with operating data. It connects PUE to cooling-system causes and recurring optimization actions.
CASE40 · District heating
Baseline-based M&VHeating degree days (HDD) and historical heat-meter data establish an adjusted baseline for a residential district-heating system. Smart supply-temperature control is evaluated against that baseline and cross-checked with household heating consumption.
CASE41 · District heating
TargetSupply- and demand-side heat, temperature and flow data identify temperature margins and network-loss patterns. The proposed operating strategy preserves terminal service while adjusting temperature and pump dispatch to demand.
CASE42 · Manufacturing
Reported field resultFive-minute utility data link production-service output to energy input, dispatch and active-unit counts. A single-factory program expands to six factories at two production sites.
CASE43 · Manufacturing
PotentialChillers, air handling and compressed air are diagnosed as an integrated utility portfolio. Service-specific KPIs and short-interval events reveal operating questions that monthly consumption cannot explain.
CASE44 · Manufacturing
Measured-data diagnosisLow- and high-temperature chillers and CDA compressors are compared with consistent KPI boundaries. Performance differences guide investigation of load, staging, pumps and bypass control.
CASE45 · Manufacturing
PotentialDemand, supply, temperature, pressure, flow, valves and unit dispatch are examined together to find small recurring imbalances after conventional optimization has already been applied.
CASE46 · Data centers
Pilot result & potentialA multi-center program links weekly analysis and operator action to PUE, cooling states and measurement quality. Pilot EC-fan results, rollout estimates and ongoing tower tests remain separate.
CASE47 · Data centers
TargetAn IPOS proposal integrates center, floor and cooling-equipment data. PUE is decomposed into cooling electricity per IT load and equipment COP, with investigation and action checklists at each level.
CASE48 · Buildings
SimulationA design-stage DOE-2.1E model divides a vertical mixed-use development by facility and operating schedule. Demand, final energy, primary energy and historical rating expectations are interpreted separately.
CASE49 · Buildings
SimulationSingle-variable model runs compare envelope, thermal mass, lighting, HVAC and plant choices under consistent assumptions. Results reveal both favorable and unfavorable annual energy-cost changes.
CASE50 · Buildings
SimulationThe same building model isolates three fenestration changes. Their annual energy-cost impacts are interpreted with thermal transfer, solar gain and daylighting kept distinct.
CASE51 · Buildings
SimulationA real design-modeling project compares a mixed-use proposed building with four rotated historical ASHRAE baselines. The cost result is separated from site-energy use and certification claims.
CASE52 · Manufacturing
Field analysis / Test & AdjustTen-second power, airflow, pressure and operating-state records distinguish useful air production from unloaded running. Stepwise dispatch tests seek efficient base/trim combinations while preserving production pressure.
CASE53 · Manufacturing
Field data / Test & AdjustA manufacturing chiller-system case examines whether raising the chilled-water leaving-temperature setpoint can improve system efficiency while satisfying process, HVAC and dehumidification requirements.
CASE54 · Manufacturing
PotentialCommon-header and critical end-use pressure measurements support integrated sequencing and staged pressure tests. The target is adequate process service with minimum system energy.
CASE55 · Manufacturing
PotentialActual chilled-water demand and pump operating points are checked against original sizing. Control changes, impeller adjustment and pump replacement are compared at the required service level.
CASE56 · Manufacturing
Field test resultActual operating units are changed while cooling output and power are measured. Specific energy distinguishes efficiency improvement from changes in the amount of cooling delivered.
CASE57 · Manufacturing
Test planHistorical demand, valve, ΔT and staging data motivate a temperature-level and load-sharing test. The plan checks OAC and process conditions before deciding how many chillers and pumps should run.
CASE58 · Manufacturing
PotentialPer-pump flow above design motivates staged adjustment. Pump power is evaluated together with chiller performance and tower fan electricity to locate an efficient system operating point.
CASE59 · Manufacturing
Field diagnosisUnit-level specific energy identifies persistently inefficient candidates. Matched pressure and load comparisons precede mechanical inspection, maintenance and remeasurement.
CASE60 · Manufacturing
Field test / Null resultAn oil-fouling hypothesis is tested through actual additive application and before/after operating analysis. The completion report records no demonstrated benefit, providing no basis to assign savings or proceed from an assumed claim.
CASE61 · Manufacturing
Optimization planDemand peaks are traced upstream to production activity, storage and control behavior. The plan first changes the demand profile, then reassesses required online capacity.
CASE62 · Manufacturing
Field test resultMeasured chiller intensity is compared at inlet temperatures from 20 to 22.5°C. Seasonal tower settings follow the test while plant-level energy balances remain distinct from the chiller-only minimum.
CASE63 · Manufacturing
Reported field resultA 13°C section had its most efficient chiller at the lowest load. Chilled-water pump discharge valves redistributed cooling output, and the result was evaluated at the combined system boundary.
CASE64 · Manufacturing
Program-level resultHistorical excess online capacity led to staged operation changes within a real-time utility-efficiency program. The reported 27% intensity improvement reflects combined program activities, not one stopped chiller alone.
CASE65 · Manufacturing
Field test resultTwo equal-capacity boilers are compared through actual changeover operation. Fuel intensity, steam load and supply conditions support efficient priority selection while the annual benefit retains its historical calculation basis.
CASE66 · Manufacturing
Field analysis / Test planField analysis identifies increasing specific fuel consumption below a source load range. Tests compare a single larger boiler with two smaller units while dispatch criteria remain tied to steam service.
CASE67 · Manufacturing
Field diagnosisField correlations connect gas-per-steam intensity to flue-gas temperature and oxygen. They guide inspection and combustion tests while preserving the distinction between observed association and confirmed cause.
CASE68 · Manufacturing
Data quality / M&V readinessAbnormal steam-flow values compromise the denominator of gas-per-steam intensity. The case prioritizes calibration and physical consistency before quantitative savings evaluation.
CASE69 · Manufacturing
Field diagnosisThe source treats steam pressure as part of boiler operating diagnosis. A service-led review of critical users, network losses and load patterns supports a staged pressure test without inventing a completed savings result.
CASE70 · Data centers
Field diagnosis / ProposalA site-to-room PUE comparison triggers an equipment-level investigation. Fans operating without an active cooling call are examined before any change to the cooling sequence.
CASE71 · Data centers
Field diagnosis / ProposalA multi-site cooling diagnosis evaluates electronically commutated fans as a retrofit option. Fan selection, control integration and operating economics are treated together.
CASE72 · Data centers
Field diagnosis / ProposalClimate, humidity, air quality and cooling architecture determine whether free cooling is useful. The diagnosis compares direct-air, indirect-air and water-side options at the system boundary.
CASE73 · Data centers
Field diagnosis / ProposalCooling-tower leaving-water temperature is reviewed as a controllable plant variable. Lower water temperature can reduce chiller lift while increasing tower fan energy.
CASE74 · Data centers
Platform proposal / PotentialA 2017 IPOS proposal connects metering, common KPI definitions, equipment diagnosis and measurement and verification. Its numerical targets remain proposal-stage expectations.
CASE75 · Power plants
Field benchmark / ProposalA by-product-gas power plant compares auxiliary electricity relative to generation. Unit-level differences identify where pump and fan investigation should begin.
CASE76 · Power plants
Field equipment / DiagnosisA large parallel-pump inventory is analyzed with seven generating units. Pump dispatch is evaluated against feedwater requirements, condenser performance and total auxiliary electricity.
CASE77 · Data centers
Field diagnosis / ProposalA 2017 consulting scope treats support facilities as a separate load group. Inventory and consumption patterns identify persistent demand that main cooling KPIs may overlook.
CASE78 · Manufacturing
Field analysis / DiagnosisSemiconductor/display utility data compare individual pumps and running states. Electricity, delivered flow and hydraulic duty are combined to identify a weaker operating choice.
CASE79 · Data centers
Field diagnosis / ProposalSeasonal load and running-count data identify staging questions in data-center cooling. An operator guide flags possible excess operation for verification before a pump is stopped.
CASE80 · Data centers
Field diagnosis / ProposalA data-center operating guide compares active chillers with the estimated number needed for cooling load. Count differences prompt an operating review rather than an automatic savings claim.
CASE81 · Data centers
Field diagnosis / In progressTower performance and instrument consistency are examined separately from setpoint optimization. A poor apparent approach first triggers checks of load, weather, water distribution and fan state.
CASE82 · Data centers
Field analysis / Cost potentialSite electricity and billing records identify a possible mismatch between contract demand and actual peak. The proposed contract change represents cost potential, not a reduction in electricity use.
CASE83 · Manufacturing
Field M&V / Valid subsetTwo anonymized automotive-parts extrusion lines are compared using production-normalized intensity and a multivariable baseline. Regression savings apply only to the observations accepted by the source validity rule.
CASE84 · Manufacturing
Field test / Partial M&VThree anonymized tests distinguish matched-condition electricity reduction from production-normalized intensity improvement. The comparison screens repeatable operating opportunities without claiming annual savings.
CASE85 · Buildings
Simulation / Runtime potentialA historical-weather model replaces stepped minimum-temperature schedules with an HDD-based daily runtime guide. The result is an operating-hour potential, not a measured fuel saving.
CASE86 · Buildings
Simulation / Operating guideA minute-step thermal model searches for the latest heating or cooling start that meets the 08:30 indoor-temperature target. Historical-weather results describe recommended pre-start hours.
CASE87 · District heating
SimulationA historical-weather simulation compares conventional outdoor-air reset with an hourly demand-aware supply-temperature guide. The outputs describe setpoint differences and improvement potential, not measured heat savings.
CASE88 · Buildings
Simulation / Energy potentialA commercial-building model recommends precooling start, chilled-water, supply-air and condenser-water temperatures together. Historical-weather energy differences are kept distinct from measured plant savings.
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