Plumbing Hydronic Circulator Head Calculator

Reconcile actual parallel hydronic branch design losses plus independent shared primary loss, no summing parallel heads or closed-loop static elevation; not a network balance/installed pump approval.

Description

A parallel hydronic circuit requires its largest branch loss plus shared primary loss.

A parallel hydronic circuit requires its largest branch loss plus shared primary loss. Adding parallel heads would overstate the requirement.^[1]

The returned values include Design branch heads m, Required parallel hydronic circulator head m, Controlling hydronic branch ids. The How section below explains the calculation, input rules and interpretation.

When to use Plumbing Hydronic Circulator Head Calculator

Use Plumbing Hydronic Circulator Head Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. No closed-loop elevation addition, network balancing or installed-pump approval is supplied.

Prepare measured flows, pressures, temperatures or inventories with consistent units. For catalog tools, use independently verified capacities at the stated operating conditions and supply the explicit design demand.

How to use Plumbing Hydronic Circulator Head Calculator and understand its results

Prepare measured flows, pressures, temperatures or inventories with consistent units. For catalog tools, use independently verified capacities at the stated operating conditions and supply the explicit design demand.
Enter hydronicBranchIds, observedDesignBranchDistributedLossM, observedDesignBranchValveLossM, observedSharedPrimaryHeadLossM using the field table and calculation rules, then run the tool.
Read designBranchHeadsM, requiredParallelHydronicCirculatorHeadM, controllingHydronicBranchIds. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
hydronicBranchIds	Hydronic branch ids	list of string	Required
observedDesignBranchDistributedLossM	Observed design branch distributed loss m	list of number	Required
observedDesignBranchValveLossM	Observed design branch valve loss m	list of number	Required
observedSharedPrimaryHeadLossM	Observed shared primary head loss m	number	Required

Enter aligned nonempty unique nonblank branch IDs and nonnegative branch losses, plus nonnegative shared loss. Return branch heads, required circulator head and all tied controlling branch IDs.

branchHead_i=distributed_i+valve_i; required=max(branchHead)+sharedLoss

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
designBranchHeadsM	Design branch heads m	list of number
requiredParallelHydronicCirculatorHeadM	Required parallel hydronic circulator head m	number
controllingHydronicBranchIds	Controlling hydronic branch ids	list of string

json

{
  "input": {
    "hydronicBranchIds": [
      "a",
      "b"
    ],
    "observedDesignBranchDistributedLossM": [
      2,
      4
    ],
    "observedDesignBranchValveLossM": [
      1,
      2
    ],
    "observedSharedPrimaryHeadLossM": 1
  },
  "output": {
    "designBranchHeadsM": [
      3,
      6
    ],
    "requiredParallelHydronicCirculatorHeadM": 7,
    "controllingHydronicBranchIds": [
      "b"
    ]
  }
}

Limitations and assumptions

No closed-loop elevation addition, network balancing or installed-pump approval is supplied.

Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Numeric lists are limited to 10,000 entries; string lists to 128 strings of at most 128 characters each. The rules above may impose smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Plumbing Total Head Loss Calculator: Route head loss adds distributed and local segment losses within each route. Parallel route totals must be compared rather than summed together. For a complementary task, use Plumbing Pump Head Required Calculator: Required pump head combines route elevation, losses and boundary pressure and velocity-head changes. Favorable elevation or pressure retains its negative sign.

References

Plumbing Hydronic Circulator Head Calculator — tool.io

Similar or alternative tools

Plumbing Total Head Loss Calculator
Route head loss adds distributed and local segment losses within each route. Parallel route totals must be compared rather than summed together.
Plumbing Pump Head Required Calculator
Required pump head combines route elevation, losses and boundary pressure and velocity-head changes. Favorable elevation or pressure retains its negative sign.