Geo Energy

i)

ii)

iii)

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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 = ---- >

□

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

□