Working volume · return flow · time
Hydraulic reservoir dwell time
Inputs
User-entered liquid working volume; tank geometry, fluid level, and total vessel capacity are not derived.
User-entered steady flow used only for literal volume-over-flow dwell arithmetic.
User-entered time reference for a literal equivalent-volume comparison; it is not a requirement or recommendation.
Results
Literal reservoir dwell timet
5
Literal volume at declared dwell-time reference
120
Literal dwell-time / reference ratio
1.25
1Declared return or pump flowQ
30
tdwell = Vworking/Qreturn; Vref = Qreturn·tref; ratio = tdwell/tref
A first-pass number, not a code check, certification, or approval. Read the method and its limits below. What this is and is not.
Nearby: Hydrostatic pressure · Flow continuity · Pipe mean velocity · Bernoulli equation
Method
Formula, when it applies, and when it does not
Convert working reservoir volume and return flow into dwell time and a user-reference-volume comparison without sizing a reservoir or evaluating thermal performance.
tdwell = Vworking/Qreturn; Vref = Qreturn·tref; ratio = tdwell/tref
When
- Declared pump or return flow
- Steady volume-over-flow dwell relation
- User-entered dwell-time reference
Don’t
- This divides only a declared working reservoir volume by a declared steady flow, then compares that result to a user-entered reference time. It does not select a reservoir, apply a rule-of-thumb, estimate cooling, aeration, contamination, geometry, fluid level, heat rejection, flow distribution, capacity, safety, suitability, or approval.