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MCQUAY DIGITAL SCROLL SYSTEM

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

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  1. MCQUAY DIGITAL SCROLL SYSTEM Unit & Piping Selection

  2. Sample of Installation

  3. 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

  4. 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

  5. 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

  6. Restriction of Piping Length

  7. 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

  8. 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

  9. 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.

  10. Unit & Piping Selection Refrigerant Copper Pipe Specification : MDS-B

  11. 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

  12. 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

  13. Unit & Piping Selection Selection of branch joint / distributors for MDS

  14. Unit & Piping Selection MDS-Y1~Y4 dimensional drawing

  15. Unit & Piping Selection MDS-Y6 dimensional drawing

  16. Unit & Piping Selection MDS-Y7 dimensional drawing

  17. Unit & Piping Selection MDS-C1 dimensional drawing

  18. Unit & Piping Selection MDS-C2~C3 dimensional drawing

  19. Unit & Piping Selection Caution Using Distribution Header may lead to imbalance refrigerant flow.

  20. Refnet Joint Unit & Piping Selection Connection Type of Refnet Joint/Distributors Allow

  21. Distributor Unit & Piping Selection Connection Type of Refnet Joint/Distributor Allow

  22. Refnet Joint Distributor Unit & Piping Selection Connection Type of Refnet Joint/Distributors Allow

  23. Refnet Joint Distributor Unit & Piping Selection Connection Type of Refnet Joint/Distributors Not Allow

  24. Unit & Piping Selection Cooling Capacity Correction Factor

  25. Unit & Piping Selection Heating Capacity Correction Factor

  26. Unit & Piping Selection Cooling Capacity Correction Factor Cooling cap. factor

  27. Unit & Piping Selection Heating Capacity Correction Factor

  28. Unit & Piping Selection Refrigerant Pipe Specification : MDS-A

  29. Unit & Piping Selection Refrigerant Pipe Specification : MDS-B

  30. E A B F C D Unit & Piping Selection Example Building Type: Bungalow

  31. 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

  32. Unit & Piping Selection Indoor Requirement

  33. Unit & Piping Selection Example • Total Indoor capacity is 26.55 kW

  34. 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

  35. Comply to selection criteria Unit & Piping Selection Example Selected Outdoor : MDS100B Cooling Capacity : 28.0kW

  36. Unit & Piping Selection Example • Selected Outdoor and Indoor Model

  37. Unit & Piping Selection Example Outdoor Capacity factor • Cooling only model • Ambient temperature : 35.0 °C • Indoor temperature : 22.0 °C 1.08

  38. Unit & Piping Selection Example • Piping length & height factor • Piping length：40m • Height between I/O：4m • Outdoor Unit located below indoors 97%

  39. 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

  40. E A B F C D Unit & Piping Selection Example Building Type: Bungalow

  41. 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

  42. Unit & Piping Selection Refrigerant Pipe Specification : MDS-B

  43. 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

  44. Unit & Piping Selection Refrigerant Pipe Specification : MDS-B Point A A-B-C : 12.59 kW A-D-E : 13.96 kW

  45. 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

  46. 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

  47. Unit & Piping Selection Refrigerant Pipe Specification : MDS-B Point B B-C : 5.56 kW B-MCCD25C : 7.03kW

  48. 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

  49. Unit & Piping Selection Example

  50. 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

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