MCQUAY DIGITAL SCROLL SYSTEM

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# MCQUAY DIGITAL SCROLL SYSTEM - PowerPoint PPT Presentation

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

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Presentation Transcript
MCQUAY DIGITAL SCROLL SYSTEM

Unit & Piping Selection

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

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

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

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

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

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.

Unit & Piping Selection

Refrigerant Copper Pipe Specification : MDS-B

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

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

Unit & Piping Selection

Selection of branch joint / distributors for MDS

Unit & Piping Selection

MDS-Y1~Y4 dimensional drawing

Unit & Piping Selection

MDS-Y6 dimensional drawing

Unit & Piping Selection

MDS-Y7 dimensional drawing

Unit & Piping Selection

MDS-C1 dimensional drawing

Unit & Piping Selection

MDS-C2~C3 dimensional drawing

Unit & Piping Selection

Caution

Refnet Joint

Unit & Piping Selection

Connection Type of Refnet Joint/Distributors

Allow

Distributor

Unit & Piping Selection

Connection Type of Refnet Joint/Distributor

Allow

Refnet Joint

Distributor

Unit & Piping Selection

Connection Type of Refnet Joint/Distributors

Allow

Refnet Joint

Distributor

Unit & Piping Selection

Connection Type of Refnet Joint/Distributors

Not Allow

Unit & Piping Selection

Cooling Capacity Correction Factor

Unit & Piping Selection

Heating Capacity Correction Factor

Unit & Piping Selection

Cooling Capacity Correction Factor

Cooling cap. factor

Unit & Piping Selection

Heating Capacity Correction Factor

Unit & Piping Selection

Refrigerant Pipe Specification : MDS-A

Unit & Piping Selection

Refrigerant Pipe Specification : MDS-B

E

A

B

F

C

D

Unit & Piping Selection

Example

Building Type: Bungalow

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

Unit & Piping Selection

Indoor Requirement

Unit & Piping Selection

Example

• Total Indoor capacity is 26.55 kW

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

Comply to selection criteria

Unit & Piping Selection

Example

Selected Outdoor : MDS100B

Cooling Capacity : 28.0kW

Unit & Piping Selection

Example

• Selected Outdoor and Indoor Model

Unit & Piping Selection

Example

Outdoor Capacity factor

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

1.08

Unit & Piping Selection

Example

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

97%

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

E

A

B

F

C

D

Unit & Piping Selection

Example

Building Type: Bungalow

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

Unit & Piping Selection

Refrigerant Pipe Specification : MDS-B

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

Unit & Piping Selection

Refrigerant Pipe Specification : MDS-B

Point A

A-B-C : 12.59 kW

A-D-E : 13.96 kW

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

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

Unit & Piping Selection

Refrigerant Pipe Specification : MDS-B

Point B

B-C : 5.56 kW

B-MCCD25C : 7.03kW

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

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

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

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

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

Unit & Piping Selection

Example

Using liquid tube length to calculate required 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）

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)

Unit & Piping Selection

Example

Total Piping Length

12.7mm – 1m 9.52mm – 29m 6.35mm – 11m

= ∑ 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

Unit & Piping Selection

Electronic Expansion Valve

EXV Box

Unit & Piping Selection

Electronic Expansion Valve

3 units

1 unit

2 units