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MCQUAY DIGITAL SCROLL SYSTEM. Unit & Piping Selection. Sample of Installation. Unit & Piping Selection. Main Factors to consider during Piping Selection Location of equipment Indoor Unit Outdoor Unit Refnet & Distributor Joint.

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mcquay digital scroll system
MCQUAY DIGITAL SCROLL SYSTEM

Unit & Piping Selection

slide3

Unit & Piping Selection

Main Factors to consider during Piping Selection

  • Location of equipment
    • Indoor Unit
    • Outdoor Unit
    • Refnet & Distributor Joint

These item will influence the piping layout and length of the design

slide4

Unit & Piping Selection

Some other factors to consider during Piping Selection

  • Equivalent Piping Length
  • Type of Joint for branches
  • Outdoor capacity factor
  • Piping length & height factor
  • Refrigerant Pipe Specification
slide5

Equivalent Piping Calculation

Equivalent length is the converted length and includes parts such as elbow, which has pressure losses in the pipe. The formula is as follow:

Equivalent length

= Real length of tubing + No. of elbow × Equivalent length of each elbow + No. of oil trap ×Equivalent length of each oil trap

slide7

Important Factor to Consider

Example:

Outdoor Model : MDS100BR

Pipe Diameter : 28.6 mm

Main Pipe : 80m

Branch Length: 20m

Elbows: 10 units

Oil traps: 3 units

Equivalent Length

= Real length of tubing + No. of elbow × Equivalent length of each elbow + No. of oil trap ×Equivalent length of each oil trap

= (80 + 20) + (10 X 0.5) + (3 X 3.7) = 116.1 m

slide8

Important Criteria

Criteria 1

When the equivalent length is over 90% of the maximal real length the diameter of the main tubing (from the outdoor unit to the first branch joint) should be one size bigger than normal.

Criteria 2

After expanded the gas pipe to a larger diameter, the equivalent length need to be recalculate. The formula is as follow:

Expanded Equivalent Length = Equivalent length of main piping X 0.5 + equivalent length of the branch

slide9

Important Factor to Consider

Example:

Maximum allow actual length for 10Hp is 125m

Calculated Equivalent Length is 116.1m

Ratio of Equivalent Length over Maximum allow Actual Length= 92.88%

Equivalent length is over 90% of the maximal real length the diameter of the main tubing.

Hence the gas Pipe of MDS100BR need to change.

slide10

Unit & Piping Selection

Refrigerant Copper Pipe Specification : MDS-B

slide11

Important Factor to Consider

Example:

Hence the gas Pipe of MDS100BR need to change from 28.6 mm to 34.9 mm

After expanded the gas pipe to a larger diameter, the equivalent length need to be recalculate.

Expanded Equivalent Length

= Equivalent length of main piping X 0.5 + equivalent length of the branch

Main Pipe : 80m

Branch Length: 20m

Elbows: 10 units

Oil traps: 3 units

Equivalent Length

= Real length of tubing + No. of elbow × Equivalent length of each elbow + No. of oil trap ×Equivalent length of each oil trap

= (80 + 20) + (10 X 0.5) + (3 X 3.7) = 116.1 m

Expanded Equivalent Length = [80 + (10 X 0.5) + (3 X 3.7)] X 0.5 + 20

Expanded Equivalent Length = 68.05 m

slide12

Unit & Piping Selection

  • Type of Joint for branches
    • Influence the piping layout design
  • Outdoor capacity factor
    • Influence by the design ambient temperature and indoor temperature
  • Piping length & height factor
    • Influence by the location of outdoor and the total piping length
  • Refrigerant Pipe Specification
    • Use to determine the branches diameter
slide13

Unit & Piping Selection

Selection of branch joint / distributors for MDS

slide14

Unit & Piping Selection

MDS-Y1~Y4 dimensional drawing

slide15

Unit & Piping Selection

MDS-Y6 dimensional drawing

slide16

Unit & Piping Selection

MDS-Y7 dimensional drawing

slide17

Unit & Piping Selection

MDS-C1 dimensional drawing

slide18

Unit & Piping Selection

MDS-C2~C3 dimensional drawing

slide19

Unit & Piping Selection

Caution

Using Distribution Header may lead to imbalance refrigerant flow.

slide20

Refnet Joint

Unit & Piping Selection

Connection Type of Refnet Joint/Distributors

Allow

slide21

Distributor

Unit & Piping Selection

Connection Type of Refnet Joint/Distributor

Allow

slide22

Refnet Joint

Distributor

Unit & Piping Selection

Connection Type of Refnet Joint/Distributors

Allow

slide23

Refnet Joint

Distributor

Unit & Piping Selection

Connection Type of Refnet Joint/Distributors

Not Allow

slide24

Unit & Piping Selection

Cooling Capacity Correction Factor

slide25

Unit & Piping Selection

Heating Capacity Correction Factor

slide26

Unit & Piping Selection

Cooling Capacity Correction Factor

Cooling cap. factor

slide27

Unit & Piping Selection

Heating Capacity Correction Factor

slide28

Unit & Piping Selection

Refrigerant Pipe Specification : MDS-A

slide29

Unit & Piping Selection

Refrigerant Pipe Specification : MDS-B

slide30

E

A

B

F

C

D

Unit & Piping Selection

Example

Building Type: Bungalow

slide31

Unit & Piping Selection

Example

Requirement

  • Cooling only model
  • Ambient temperature : 35.0 °C
  • Indoor temperature : 22.0 °C
  • Other Information
  • Piping length:40m
  • Height between I/O:4m
  • Outdoor Unit located below indoors
slide32

Unit & Piping Selection

Indoor Requirement

slide33

Unit & Piping Selection

Example

  • Total Indoor capacity is 26.55 kW
slide34

Unit & Piping Selection

Example

Selection Criteria

  • Indoor cap. should between 50% ~ 120% of the outdoor cap.
  • We recommend that the outdoor capacity equals to the indoor capacity or a little larger than the indoor capacity
slide35

Comply to selection criteria

Unit & Piping Selection

Example

Selected Outdoor : MDS100B

Cooling Capacity : 28.0kW

slide36

Unit & Piping Selection

Example

  • Selected Outdoor and Indoor Model
slide37

Unit & Piping Selection

Example

Outdoor Capacity factor

  • Cooling only model
  • Ambient temperature : 35.0 °C
  • Indoor temperature : 22.0 °C

1.08

slide38

Unit & Piping Selection

Example

  • Piping length & height factor
  • Piping length:40m
  • Height between I/O:4m
  • Outdoor Unit located below indoors

97%

slide39

Unit & Piping Selection

Example

Total Capacity

= Outdoor Capacity X Outdoor Capacity Factor

X Piping length & height Factor

= 28.0 kW X 1.08 X 97%

= 29.3 kW

slide40

E

A

B

F

C

D

Unit & Piping Selection

Example

Building Type: Bungalow

slide41

Unit & Piping Selection

Example

  • Selection pipe diameter

MDS100B

C

A

B

MWMD 010G

MWMD 010G

MCCD 025C

2.78 kW

2.78 kW

7.03 kW

D

E

MWMD 010G

MCKD 020A

MWMD 020G

2.78 kW

5.59 kW

5.59 kW

slide42

Unit & Piping Selection

Refrigerant Pipe Specification : MDS-B

slide43

Unit & Piping Selection

Example

Calculate the downstream capacity

Point A

A-B-C : 12.59 kW

A-D-E : 13.96 kW

Point B

B-C : 5.59 kW

D-E : 8.37 kW

Main pipe diameter :

ø 12.7mm / ø 28.6mm

MDS100B

A

C

B

MWMD 10G

MWMD 10G

MCCD 25C

2.78 kW

2.78 kW

7.03 kW

D

E

MWMD 10G

MCKD 20A

MWMD 20G

2.78 kW

5.59 kW

5.59 kW

slide44

Unit & Piping Selection

Refrigerant Pipe Specification : MDS-B

Point A

A-B-C : 12.59 kW

A-D-E : 13.96 kW

slide45

Unit & Piping Selection

Example

Main pipe diameter :

ø 12.7mm / ø 28.6mm

A-B diameter :

ø 9.52mm / ø 19.05mm

MDS100B

C

A

B

MWMD 10G

MWMD 10G

MCCD 25C

2.78 kW

2.78 kW

7.03 kW

D

E

MWMD 10G

MCKD 20A

MWMD 20G

A-D diameter :

ø 9.52mm /

ø 19.05mm

2.78 kW

5.59 kW

5.59 kW

slide46

Unit & Piping Selection

Example

Point B

B-C : 5.56 kW

B-MCCD25C : 7.03kW

MDS100B

C

A

B

MWMD 10G

MWMD 10G

MCCD 25C

2.78 kW

2.78 kW

7.03 kW

D

E

MWMD 10G

MCKD 20A

MWMD 20G

2.78 kW

5.59 kW

5.59 kW

slide47

Unit & Piping Selection

Refrigerant Pipe Specification : MDS-B

Point B

B-C : 5.56 kW

B-MCCD25C : 7.03kW

slide48

Unit & Piping Selection

Example

All unit in mm

Main pipe diameter :

ø 12.7 / ø 28.6

B-C:

ø 9.52 / ø15.88

B-MCCD25C:

ø 9.52 / ø15.88

MDS100B

C

A

B

MWMD 10G

MWMD 10G

MCCD 25C

A-B:

ø 9.52

/ ø 19.05

2.78 kW

2.78 kW

7.03 kW

D

E

MWMD 10G

MCKD 20A

MWMD 20G

A-D:

ø 9.52

/ ø 19.05

2.78 kW

5.59 kW

5.59 kW

slide50

Unit & Piping Selection

Example

Main pipe diameter :

ø 12.7mm / ø 28.6mm

A-B diameter :

ø 9.52mm / ø 19.05mm

B-C diameter :

ø 9.52mm / ø15.88mm

MDS100B

C

A

B

MWMD 10G

MWMD 10G

MCCD 25C

D

E

MWMD 10G

MCKD 20A

MWMD 20G

A-D diameter :

ø 9.52mm / ø 19.05mm

D-E diameter :

ø 9.52mm / ø15.88mm

slide51

Unit & Piping Selection

Example

All unit in mm

  • Selection of branch

A-B diameter :

ø 9.52 / ø 19.05

Main pipe diameter :

ø 12.7 / ø 28.6

A

Select the refnet joint of point A

A (liquid) : MDS-Y2

A (gas) : MDS-Y1

A-D diameter :

ø 9.52 / ø 19.05

slide52

Unit & Piping Selection

Example

Main pipe diameter :

ø 12.7 / ø 28.6

B-C:

ø 9.52 /

ø15.88

MDS100B

A

C

B

MWMD 10G

MWMD 10G

MCCD 25C

A-B:

ø 9.52 /

ø 19.05

D

E

MWMD 10G

MCKD 20A

MWMD 20G

A-D:

ø 9.52 /

ø 19.05

D-E:

ø 9.52 /

ø15.88

All unit in mm

slide53

Unit & Piping Selection

Example

  • Selection of branch

Select the refnet joint of point

A (liquid): MDS-Y2 A (gas) : MDS-Y1

B (liquid): MDS-Y3 B (gas) : MDS-Y4

C (liquid): MDS-Y2 C (gas) : MDS-Y2

D (liquid): MDS-Y2 D (gas) : MDS-Y4

E (liquid): MDS-Y2 E (gas) : MDS-Y4

slide54

Unit & Piping Selection

Example

Using liquid tube length to calculate required refrigerant

→ Add in refrigerant

Formula:

G = ∑ Li* Gi

G : Refrigerant charge amount

Li : The each section of liquid tube length in all (m)

Gi : Charge amount per length(g/m)

slide55

Unit & Piping Selection

Example

Total Piping Length

12.7mm – 1m

9.52mm – 29m

6.35mm – 11m

1m (12.70mm)

5m (9.52mm)

5m (9.52mm)

2m (6.35mm)

MDS100B

C

A

B

MWMD 10G

MWMD 10G

MCCD 25C

1m (9.52mm)

1m (6.35mm)

2m (6.35mm)

15m (9.52mm)

D

E

5m (6.35mm)

MCKD 20A

MWMD 20G

MWMD 10G

3m (9.52mm)

1m (6.35mm)

slide56

Unit & Piping Selection

Example

Total Piping Length

12.7mm – 1m 9.52mm – 29m 6.35mm – 11m

Additional charge amount :

= ∑ Li* Gi

= (Piping Length for 15.88mm X Refrigerant Charge Amount)

+ (Piping Length for 12.7mm X Refrigerant Charge Amount)

+ (Piping Length for 9.52mm X Refrigerant Charge Amount)

+ (Piping Length for 6.35mm X Refrigerant Charge Amount)

= (0 X 180) + (1 x 120) + (29 x 80) + (11 x 50)

= 2990 g

slide57

Unit & Piping Selection

Electronic Expansion Valve

EXV Box

slide58

Unit & Piping Selection

Electronic Expansion Valve

3 units

1 unit

2 units