Heat Pump Pipe Sizing – OMNIE Underfloor Heating, Heat Pumps & Ventilation
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Heat Pump Pipe Sizing
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Heat Pump Pipe Sizing

TX HP 06

Heat pump pipes need to be larger than boiler pipes because the flow rate is higher for a given output. This will lead to a greater pressure loss through the pipework and fittings.

Table 1 for copper pipework and glycol

 

Table 1 shows the typical capacities of heat pumps and recommended pipe sizes. If the maximum pipe run is exceeded either find a shorter route or increase to the next pipe size. If using plastic pipe of any description consider the larger size since plastic pipe and the fittings have a greater friction factor. The table above assumes an air source heat pump with a 30% mixture of propylene glycol for frost protection down to -13 degC. A ground source system will be just water so the flow rate is slightly less and lower pressure loss therefore possibly smaller pipes (see table 2).

 

 

 

Capacity (kW)Flow rate m3/hPipe size mmPressure Drop Pa/MMax Pipe length M
512240022
71.42828032
1022840022
122.42854015
142.83526033
163.23532028
183.63542020
2043548017
244.84227034
285.64236024
326.54246018

Table 2 Copper pipework and inhibited water

 

Calculate the total pressure loss through the system then check it against the available free pressure from the heat pump circulation pump. The free pressure must be greater than the system pressure loss.

Example 1:

  • 12 kW ground source, pipe length 12m
  • 12 x 420 Palm= 50 40 Pa

Example 2:

  • 20 kW air source, pipe length 20m
  • max = 17m
  • Increase pipe size to 42mm or reduce pipe length

 

(1 Bar = 100K Pa = 10m (water used))

 

CapacityFlow rate m3/hPipe size mmPressure Drop Pa/MMax Pipe length M
50.862232029
71.202256016
101.712831030
122.062842022
142.402856016
163.743525038
183.093531030
203.433537025
244.114221046
284.804227035
325.494234027
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