CASE88 · Buildings · Integrated cooling / Weather-adaptive guide
Coordinating cooling start and water/air setpoints with forecast weather
A 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.
01 · CASE ANALYSIS
Treat cooling as one operating strategy
The guide uses hourly outdoor temperature and relative humidity to calculate enthalpy and a cooling-demand index. It recommends precooling start, CHWST, AHU supply-air temperature and tower leaving-water temperature.
The modeled occupied-start target is 08:30. Chillers, AHUs, towers and condenser-water pumps interact, so individual setpoints should not be optimized in isolation.
02 · CASE ANALYSIS
Retain the historical-weather results
The model reads 8,760 hourly Seoul weather observations for 2023. Across 153 summer days, average optimal precooling was 0.95 h/day and mean recommended chilled-water supply temperature was 8.80°C.
Source electricity totals were 531,289 kWh for the existing strategy and 489,695 kWh for the proposed strategy, a difference of 41,594 kWh or 7.83%.
| Item | Value |
|---|---|
| Weather observations | 8,760 hours; 2023 Seoul |
| Summer days | 153 |
| Mean precooling | 0.95 h/day |
| Mean recommended CHWST | 8.80°C |
| Existing / proposed modeled electricity | 531,289 / 489,695 kWh |
| Modeled difference | 41,594 kWh; 7.83% |
03 · CASE ANALYSIS
State the incomplete energy boundary
Those electricity totals are model calculations, not metered site data. Some precooling-period consumption and auxiliary electricity are not fully included.
The difference therefore cannot be stated as complete net plant savings or verified energy reduction. It is source-model potential under its assumptions.
04 · CASE ANALYSIS
Calibrate and measure the integrated plant
Calibrate weather/setpoint rules against indoor service, operating hours, chiller part-load performance and actual plant measurements. Confirm humidity and rack/zone thermal requirements where applicable.
Include all start-period and occupied-period energy, pump/fan/tower responses and weather/load adjustments in field M&V. Verified saving is adjusted-baseline energy minus actual energy at the same boundary.
| Output / boundary | Required check |
|---|---|
| Precooling start | 08:30 indoor target and full start-period energy |
| CHW / supply-air temperatures | Cooling service and part-load performance |
| Condenser-water temperature | Chiller plus tower/pump response |
| M&V energy boundary | All included equipment; adjusted baseline and actual |
Source-value comparison
Source figures · English edition
Figures correspond to those published in the Korean case. English titles, axes and legends are provided; published values and evidence boundaries are retained. Open a figure at full size to inspect small labels.
Original already-English monthly electricity-model comparison. The CASE88 model incompletely represents some precooling and auxiliary electricity; do not claim complete net savings.
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Original already-English monthly suggested chilled-water, supply-air and condenser-water temperatures. Model recommendations require building-specific calibration.
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Original already-English precooling scatter. Its data marks are preserved and remain historical simulation outputs.
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