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MDS Selection

MDS Selection. Contents. Introduction Selection Consideration Selection Process Software Demonstration. Introduction. Sample of Installation. Selection Consideration. Unit & Piping Selection. Main Factors to consider during Piping Selection Location of equipment Indoor Unit

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MDS Selection

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  1. MDS Selection

  2. Contents • Introduction • Selection Consideration • Selection Process • Software Demonstration

  3. Introduction

  4. Sample of Installation

  5. Selection Consideration

  6. 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

  7. 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

  8. 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 Recommended to install oil trap every 8 to 10 meters (vertical piping). Common for R22 and R410A

  9. Restriction of Piping Length

  10. 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

  11. When the equivalent length is more than 90% of the maximal real length of the main tubing , the gas pipe need to be increase to one size bigger (diameter). Important Factor to Consider Criteria 1 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

  12. 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 more than 90% of the maximal real length. Hence the gas Pipe of MDS100BR need to change.

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

  14. Important Factor to Consider Example: Hence the gas Pipe of MDS100BR need to change from 28.6 mm to 39.40 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

  15. 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

  16. Unit & Piping Selection Selection of branch joint / distributors for MDS Optional Spec with insulation

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

  18. Unit & Piping Selection MDS-Y6/Y7 dimensional drawing

  19. Unit & Piping Selection MDS-C1 dimensional drawing

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

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

  22. Refnet Joint Refrigerant Pipe Work Connection Type of Refnet Joint/Distributors Allow

  23. Distributor Refrigerant Pipe Work Connection Type of Refnet Joint/Distributor Allow

  24. Refrigerant Pipe Work Connection Type of Refnet Joint/Distributors Allow Refnet Joint Distributor

  25. Refrigerant Pipe Work Connection Type of Refnet Joint/Distributors Not Allow Refnet Joint Distributor

  26. Unit & Piping Selection Cooling Capacity Correction Factor (R22 & R410A)

  27. Unit & Piping Selection Heating Capacity Correction Factor (R22 & R410A)

  28. Unit & Piping Selection Cooling Capacity Correction Factor (R22)

  29. Unit & Piping Selection Heating Capacity Correction Factor (R22)

  30. Unit & Piping Selection Cooling Capacity Correction Factor (R410A)

  31. Unit & Piping Selection Heating Capacity Correction Factor (R410A)

  32. Unit & Piping Selection Refrigerant Pipe Specification : MDS-A (R22)

  33. Unit & Piping Selection Refrigerant Pipe Specification : MDS-B (R22)

  34. Unit & Piping Selection Refrigerant Pipe Specification : R410A

  35. Unit & Piping Selection Additional Refrigerant Charge R22 R410A

  36. Selection Process

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

  38. Unit & Piping Selection Example • Requirement • Cooling only model • Ambient temperature : 40.0 °C • Indoor temperature : 22.0 °C • Other Information • Piping length：70m • Height between I/O：4m • Outdoor Unit located below indoors

  39. Unit & Piping Selection Indoor Requirement

  40. Unit & Piping Selection Example • Total Indoor capacity is 32.3 kW

  41. Unit & Piping Selection Example Example • Selection Criteria • Total Indoor capacity must be range between 50% ~ 120% of the outdoor capacity. • 50% of Outdoor Capacity < Indoor Capacity < 120% of Outdoor Capacity • Example: • Total Indoor Capacity = 12 HP • Outdoor size between 24 HP to 10 HP • We recommend that the outdoor capacity equals to the total indoor capacity or a little larger than the indoor capacity

  42. Unit & Piping Selection Example Selected Outdoor : MDS120B Cooling Capacity : 32.5kW Comply to selection criteria

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

  44. Unit & Piping Selection Example • Outdoor Capacity factor • Cooling only model • Ambient temperature : 40.0 °C • Indoor temperature : 22.0 °C 1.03

  45. Unit & Piping Selection Example • Piping length & height factor • Piping length：70m • Height between I/O：4m • Outdoor Unit located below indoors 91%

  46. Unit & Piping Selection Example • Total Capacity • = Outdoor Capacity X Outdoor Capacity Factor • X Piping length & height Factor • = 32.5 kW X 1.03 X 91% • = 30.47 kW Comply to requirement

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

  48. Unit & Piping Selection Example • Selection pipe diameter MDS120B A B C WMD 20G WMD 10G CCD 25C 5.6 kW 2.8 kW 6.5 kW E D WMD 10G CKD 30A WMD 20G 2.8 kW 9.0 kW 5.6 kW

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

  50. Unit & Piping Selection Example Downstream capacity Point A A-B-C : 14.9kW A-D-E : 17.4 kW Point BB-C : 8.4 kW D-E : 8.4 kW Main pipe diameter : ø 15.88mm / ø 28.6mm MDS120B A B C WMD 20G WMD 10G CCD 25C 5.6 kW 2.8 kW 6.5 kW D E CKD 30A WMD 10G WMD 20G 2.8 kW 9.0 kW 5.6 kW

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