Heat Recovery Effectiveness Calculator
Audit actual paired inlet/outlet heat-recovery sides and closure before reporting cold-side effectiveness; unequal energy sides retained. Caller independently establishes units, regime, calibration and applicability; this does not establish design-code compliance, authenticity, operational safety, treatment efficacy or a validated forecast.
Description
Heat-recovery effectiveness compares recovered heat with a capacity-limited inlet driving potential.
Heat-recovery effectiveness compares recovered heat with a capacity-limited inlet driving potential.1
Hot-side and cold-side balances can differ, so closure should be reviewed separately. Use this tool to calculate heat Recovery Effectiveness from the supplied measurements and assumptions.
When to use Heat Recovery Effectiveness Calculator
Use this tool to calculate heat Recovery Effectiveness from the supplied measurements and assumptions. Establish the SI units or caller unit basis, load signs, measurement interval, model conditions and independently chosen coefficients or references.
How to use Heat Recovery Effectiveness Calculator and understand its results
- Establish the SI units or caller unit basis, load signs, measurement interval, model conditions and independently chosen coefficients or references.
- Enter observedHotInletK, observedHotOutletK, observedColdInletK, observedColdOutletK, callerHotCapacityWK, callerColdCapacityWK, using the field meanings and rules below, then run the tool.
- Read hotRecoveredWatts, coldRecoveredWatts, signedEnergyClosureWatts, coldSideRecoveryEffectiveness. Interpret the fields using their units, signs and evidence conventions below.
- If input validation fails, correct the reported field and run again. Before applying the result, check reference scope, model assumptions and any missing evidence or placeholder values.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedHotInletK | Observed hot inlet k | number | Required |
| observedHotOutletK | Observed hot outlet k | number | Required |
| observedColdInletK | Observed cold inlet k | number | Required |
| observedColdOutletK | Observed cold outlet k | number | Required |
| callerHotCapacityWK | Caller hot capacity w k | number | Required |
| callerColdCapacityWK | Caller cold capacity w k | number | Required |
Enter positive hot/cold inlet/outlet absolute temperatures in K and positive capacity rates in W/K. Require hot inlet−cold inlet>0. Calculate hot and cold recovered watts, hot−cold closure and coldRecovered/(minCapacity×inletDifference). Outlet-derived recovered powers may be signed and effectiveness is not clamped to [0,1]; no exchanger model is fitted.
hotW=Ch×(ThIn−ThOut); coldW=Cc×(TcOut−TcIn); effectiveness=coldW/(min(Ch,Cc)×(ThIn−TcIn)) Use the exact units, boundary rules, ordering and missing-evidence conventions above.
| Output field | Meaning | Value type |
|---|---|---|
| hotRecoveredWatts | Hot Recovered Watts; follow the units, sign, ordering and evidence convention stated above | number |
| coldRecoveredWatts | Cold Recovered Watts; follow the units, sign, ordering and evidence convention stated above | number |
| signedEnergyClosureWatts | Signed Energy Closure Watts; follow the units, sign, ordering and evidence convention stated above | number |
| coldSideRecoveryEffectiveness | Cold Side Recovery Effectiveness; follow the units, sign, ordering and evidence convention stated above | number |
{
"input": {
"observedHotInletK": 320,
"observedHotOutletK": 300,
"observedColdInletK": 280,
"observedColdOutletK": 300,
"callerHotCapacityWK": 2,
"callerColdCapacityWK": 1
},
"output": {
"hotRecoveredWatts": 40,
"coldRecoveredWatts": 20,
"signedEnergyClosureWatts": 20,
"coldSideRecoveryEffectiveness": 0.5
}
}Limitations and assumptions
Hot-side and cold-side balances can differ, so closure should be reviewed separately. Interpretation depends on the units, sampling scope and exact model described above.
All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse evidence arrays fail validation; the specific bounds and alignment requirements are stated above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful result reporting false, no matches or missing evidence.
Alternative or Complementary methods
Use NTU Heat Exchanger Sizing Calculator for this related task: Counterflow NTU sizing relates target effectiveness and heat-capacity ratio to transfer area.
Use Chiller Part-Load Calculator when its separate inputs and assumptions fit the question: Chiller performance over intervals can be summarized by cooling energy divided by electrical energy.
References
-
Heat Recovery Effectiveness Calculator — tool.io
Similar or alternative tools
- NTU Heat Exchanger Sizing Calculator
Counterflow NTU sizing relates target effectiveness and heat-capacity ratio to transfer area.
- Chiller Part-Load Calculator
Chiller performance over intervals can be summarized by cooling energy divided by electrical energy.