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High
~ 50%
Permitted
Pressure
Look up heat pump pressure
Permitted Pressure
drop (kPa) = Php
Use appropriate "Active
Element" graph to compute
active element (kPa) = Pac
Use appropriate hydraulic
sizing graph(s) to compute
pipes (kPa) = Ph
1.15 *(Php+Ph+Pac)
pressure drop in header
Change no of active elements and lengths or change pipe diameter(s) or change
Use
higher efficiency
Initial estimate of allowed
pressure drop for complete ground loop circuit (kPa)
Check pump electric input
power< 2.5% of heat pump
thermal output H
Heat pump thermal output H
From ground loop sizing: Number
of (parallel) active elements = N Total Pipe length of EACH active element = L (metres)
Look up Heat pump Groundside flow rate F (litres/sec)
Select proposed active element pipe outer diameter and pipe type
Select appropriate Active Element chart for of i antifreeze and freeze rotection level
Read pr
Select required freeze protection level T (°C)
Select antifreeze
Look up Heat pump
Groundside flow rate F (litres/sec)
Select proposed header pipe outer diameter and
pipe type
Decide of no pairs of header pipes NH
Length of header run LH (metres)
Go to pump manufacturer's pump selection.
Check pump electric input power < 2.5% of heat pump thermal output H
Select required freeze protection level T (C)
Select antifreeze
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□ □
elements □ Pipe Type
□ D
□
Sub total Php + Pac+Ph = ---- >
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GSHP Hydraulics WorkSheet
Project Name
Antifreeze
Type
Freeze protection □ C
Make/
Model
Thermal
output BO/W35
Heat Pump Information
Ground flow
rate F (1/s)
H (Watts)
Pr essu r e Drop Php
(kPa)
Active Element Information
PipeODmm No. of
Element flow rate (1/s)
Pr essu r e Drop Pac
(kPa)
Pipe OD mm □ Header information
No. of pairs
headers
pair
(kPa)
□ □
Make/
Model
Pump Selection
Speed setting
Electrical input at duty point of
F 1/ s, TPD pressure □ □ %of H
Pr essu r e Drop Ph
D
Pipe Type Header flow rate (1/s) per
x 1 .15 for fittings etc = ----------> TPD
□
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