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Pressure Drop Adjustments

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Water Pressure Drop Adjustment Calculations - ref: 550/590 appendix G

Evaporator Piping

Press Drop
Correction (ft)

Upstream Pipe, Water Temperature (F)


Flow Tube Inside Diameter at Static Pressure Measurement Location (inches)
Contraction or Enlargement Section (if included - allowed for unit connections > 4")
Elbow Section (if included - allowed for unit connections > 4")

54
13.25
included
included

Flow Rate (gpm)


Length (of straight pipe)
Upstream Dia (in)
ID (inch) =>

5000
14
13.25
13.25

(inches)
15.25
Dwnstrm Dia (in)
r/d or mitre=> 2 x 45 mitre

0.031
0.074
0.886

Downstream Pipe, Water Temperature (F)


Inside Diameter at Static Pressure Measurement Location (inches)
Contraction or Enlargement Section (if included - allowed for unit connections > 4")
Elbow Section (if included - allowed for unit connections > 4")

44
13.25
included
included

Length (of straight pipe)


Upstream Dia (in)
ID (inch) =>

14
15.25
13.25

(inches)
Dwnstrm Dia (in)
13.25
r/d or mitre=> 2 x 45 mitre

0.032
0.093
0.897

* Maximum Pressure Drop correction for the Evaporator (ft H2O) =

Condenser Piping

2.013

Press Drop
Correction (ft)

Upstream Pipe, Water Temperature (F)


Inside Diameter at Static Pressure Measurement Location (inches)
Contraction or Enlargement Section (if included - allowed for unit connections > 4")
Elbow Section (if included - allowed for unit connections > 4")

85
13.25
included
included

Flow Rate (gpm)


Length (of straight pipe)
Upstream Dia (in)
ID (inch) =>

6000
14
13.25
13.25

(inches)
Dwnstrm Dia (in)
15.25
r/d or mitre=> 2 x 45 mitre

0.043
0.107
1.229

Downstream Pipe, Water Temperature (F)


Inside Diameter at Static Pressure Measurement Location (inches)
Contraction or Enlargement Section (if included - allowed for unit connections > 4")
Elbow Section (if included - allowed for unit connections > 4")

95
13.25
included
included

Length (of straight pipe)


Upstream Dia (in)
ID (inch) =>

14
15.25
13.25

(inches)
Dwnstrm Dia (in)
13.25
r/d or mitre=> 2 x 45 mitre

0.043
0.134
1.222

* Maximum Pressure Drop correction for the Condenser (ft H2O) =

2.778

* Note: The pressure drop adjustment is limited to 10% of the pressure drop reading
Notes:
1) Length (of straight pipe) - the straight pipe length of the flow tube section between the static pressure taps and the unit connection. Do not include any lengths associated with an elbow or
expansion/contraction section.
2) r/d or mitre - The worksheet calculates an adjustment for various 90 degree elbow fittings. r/d = is the turn radius of the elbow divided by the inside diameter. Mitre type elbows are
allowed for mitres <= 45 degrees.

Water Pressure Drop Adjustment Calculations - ref: 551/591 appendix G


Press Drop
Correction
(kPa)

Evaporator Piping
Upstream Pipe, Water Temperature (C)
Flow Tube Inside Diameter at Static Pressure Measurement Location (mm)
Contraction or Enlargement Section (if included - allowed for unit connections > 100mm)
Elbow Section (if included - allowed for unit connections > 100mm)

12
200
included
included

Flow Rate (l/s)


Length (of straight pipe)
Upstream Dia (mm)
ID (mm) =>

60
800
200
200

(mm)
250
Dwnstrm Dia (mm)
r/d or mitre=> 2 x 45 mitre

0.120
0.202
0.901

Downstream Pipe, Water Temperature (C)


Inside Diameter at Static Pressure Measurement Location (mm)
Contraction or Enlargement Section (if included - allowed for unit connections > 100mm)
Elbow Section (if included - allowed for unit connections > 100mm)

7
200
included
included

Length (of straight pipe)


Upstream Dia (mm)
ID (mm) =>

800
250
200

(mm)
200
Dwnstrm Dia (mm)
r/d or mitre=> 2 x 45 mitre

0.122
0.173
0.916

* Maximum Pressure Drop correction for the Evaporator (kPa) =

Condenser Piping

2.433

Press Drop
Correction (ft)

Upstream Pipe, Water Temperature (C)


Inside Diameter at Static Pressure Measurement Location (mm)
Contraction or Enlargement Section (if included - allowed for unit connections > 100mm)
Elbow Section (if included - allowed for unit connections > 100mm)

30
200
included
included

Flow Rate (l/s)


Length (of straight pipe)
Upstream Dia (mm)
ID (mm) =>

70
800
200
200

(mm)
Dwnstrm Dia (mm)
250
r/d or mitre=> 2 x 45 mitre

0.155
0.275
1.162

Downstream Pipe, Water Temperature (F)


Inside Diameter at Static Pressure Measurement Location (mm)
Contraction or Enlargement Section (if included - allowed for unit connections > 100mm)
Elbow Section (if included - allowed for unit connections > 100mm)

35
200
included
included

Length (of straight pipe)


Upstream Dia (mm)
ID (mm) =>

800
250
200

(mm)
Dwnstrm Dia (mm)
200
r/d or mitre=> 2 x 45 mitre

0.154
0.235
1.153

* Maximum Pressure Drop correction for the Condenser (kPa) =

3.133

* Note: The pressure drop adjustment is limited to 10% of the pressure drop reading
Notes:
1) Length (of straight pipe) - the straight pipe length of the flow tube section between the static pressure taps and the unit connection. Do not include any lengths associated with an elbow or
expansion/contraction section.
2) r/d or mitre - The worksheet calculates an adjustment for various 90 degree elbow fittings. r/d = is the turn radius of the elbow divided by the inside diameter. Mitre type elbows are allowed for
mitres <= 45 degrees.

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