DCW_WATER_BALANCE
Period water balance — makeup, blowdown and evaporation reconciled into an unaccounted loss, with persistence-confirmed leak detection.
When to use it
Use DCW_WATER_BALANCE when a cooling system's makeup and blowdown are metered and the site needs a reporting-period water balance, a water-per-MWh efficiency figure, or a leak alarm derived from the imbalance between them.
Interface
The published port signature. This is the whole of what the block exposes to your program — the implementation body is not shown here and ships with the download.
Inputs
| Port | Type | Unit |
|---|---|---|
| ENABLE | BOOL | — |
| MAKEUP_FLOW | REAL | m3/h |
| BD_FLOW | REAL | m3/h |
| USE_LOAD | BOOL | — |
| HEAT_LOAD_KW | REAL | kW |
| EVAP_L_PER_KWH | REAL | L/kWh |
| EVAP_RATE_M3H | REAL | m3/h |
| LEAK_PCT | REAL | % |
| LEAK_DLY | TIME | — |
| MIN_MU_TOTAL_M3 | REAL | m3 |
| MIN_MU_FLOW_M3H | REAL | m3/h |
| FAULT_DLY | TIME | — |
| MIN_ENERGY_MWH | REAL | MWh |
| RESET | BOOL | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| MAKEUP_TOTAL_M3 | REAL | m3 |
| BD_TOTAL_M3 | REAL | m3 |
| EVAP_TOTAL_M3 | REAL | m3 |
| EVAP_RATE_EST | REAL | m3/h |
| ENERGY_TOTAL_MWH | REAL | MWh |
| LOSS_M3 | REAL | m3 |
| LOSS_PCT | REAL | % |
| LOSS_RATE_M3H | REAL | m3/h |
| LOSS_RATE_PCT | REAL | % |
| RATE_VALID | BOOL | — |
| MU_PER_MWH_M3 | REAL | m3/MWh |
| KPI_VALID | BOOL | — |
| BALANCE_VALID | BOOL | — |
| LEAK_SUSPECT | BOOL | — |
| ALM_LEAK | BOOL | — |
| ALM_NEG_BALANCE | BOOL | — |
| ALM_NO_EVAP | BOOL | — |
| ALM_MU_METER_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 12
- Simulated scans
- 1724
- Simulator
- v0.1.0
Complete IEC 61131-3 implementation with a published test suite that runs on the vplant simulator. The counts above are that suite, executed on this build.
- Conforms to IEC 61131-3
- Conforms to IEC 61499
Download DCW_WATER_BALANCE — free
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