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Cooling Unit and Piping Selection for Apartment Building

This guide outlines the selection process for cooling units and piping in residential apartment buildings with specific parameters for performance and efficiency. It illustrates the calculations required based on ambient and indoor temperatures, piping lengths, and configurations to ensure optimal system operation. Important criteria such as matching indoor and outdoor capacities, calculating capacity factors based on length and height differences, and refrigerant specifications are included. The example provided demonstrates a practical application of these guidelines.

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Cooling Unit and Piping Selection for Apartment Building

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  1. Unit & Piping Selection

  2. E A B F C D Unit & Piping Selection Example Building Type: Apartment

  3. 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：10m • Outdoor Unit located below indoors

  4. Unit & Piping Selection Example • Total Indoor capacity is 9.5 hp

  5. Unit & Piping Selection Example Selection Criteria • Indoor cap. should be 50% ~ 120% of the outdoor cap. • When all the indoor units run at the same time, the indoor unit should not be larger than the outdoor • We recommend that the outdoor cap. equals to the indoor cap or a little larger than the indoor unit Selected Outdoor : MDS100B Nominal Cooling Capacity : 28.0kW Comply to selection criteria

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

  7. Unit & Piping Selection Example Other factors to consider: • 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

  8. Unit & Piping Selection Cooling cap. factor

  9. Wet bulb of the ambient temp °C Heating cap. factor Dry bulb of the indoor temp °C Unit & Piping Selection

  10. Unit & Piping Selection Cooling cap. factor

  11. Unit & Piping Selection Heating cap. factor

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

  13. Unit & Piping Selection Example • Piping length & height factor • Piping length：40m • Height between I/O：10m • Outdoor Unit located below indoors 96%

  14. Unit & Piping Selection Example Total Capacity = Outdoor Capacity X Outdoor Capacity Factor X Piping length & height Factor = 28.0 kW X 1.08 X 96% = 29.0 kW

  15. Unit & Piping Selection Example Actual indoor cap =Outdoor Capacity X Nominal indoor Capacity / Total Indoor Capacity X Piping Length & Height Factor WM10G = 29.0 kW X 10/95 X 0.96 = 2.93 kW WM20G = 29.0 kW X 20/95 X 0.96 = 5.86 kW CK20A = 29.0 kW X 20/95 X 0.96 = 5.86 kW CC25C = 29.0 kW X 25/95 X 0.96 = 7.32 kW Base on the requirement, the selected model is sufficient.

  16. Unit & Piping Selection Connection Type of Branch Joint/Branch Header

  17. Unit & Piping Selection Connection Type of Branch Joint/Branch Header

  18. Unit & Piping Selection Connection Type of Branch Joint/Branch Header

  19. Unit & Piping Selection Connection Type of Branch Joint/Branch Header Mistake

  20. Model Branch joint (2 branch) MDS-Y1 MDS-Y2 MDS-Y3 MDS-Y4 MDS-Y5 Branch header (4 branch) MDS-C1 MDS-C2 MDS-C3 Unit & Piping Selection Selection of branch joint / header for MDS

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

  22. Unit & Piping Selection MDS-Y5 dimensional drawing

  23. Unit & Piping Selection MDS-C1 dimensional drawing

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

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

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

  27. Unit & Piping Selection Example • Selection pipe diameter MDS100B C A B WM10G WM10G CC25C 2.93kW 2.93kW 7.32kW D E WM10G CK20A WM20G 2.93kW 5.86kW 5.86kW

  28. Unit & Piping Selection Example Calculate the downstream capacity Point A A-B-C : 13.20kW A-D-E : 14.70kW Point B B-C : 5.86kW D-E : 8.79kW Main pipe diameter : ø 12.7mm / ø 28.6mm MDS100B C A B WM10G WM10G CC25C 2.93kW 2.93kW 7.32kW D E WM10G CK20A WM20G 2.93kW 5.86kW 5.86kW

  29. Specification Unit & Piping Selection Example

  30. Unit & Piping Selection Example B-C diameter : ø 9.52mm / ø15.88mm A-B diameter : ø 9.52mm / ø 19.05mm MDS100B C A B WM10G WM10G CC25C D E WM10G CK20A WM20G A-D diameter : ø 9.52mm / ø 19.05mm D-E diameter : ø 9.52mm / ø15.88mm

  31. 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 WM10G WM10G CC25C D E WM10G CK20A WM20G A-D diameter : ø 9.52mm / ø 19.05mm D-E diameter : ø 9.52mm / ø15.88mm

  32. Unit & Piping Selection Example • Selection of branch • Select the branch of point A • A (liquid) : MDS-Y2 • A (gas) : MDS-Y1 • Select the branch of other points • B (liquid) : MDS-Y3 C (liquid) : MDS-Y2 • B (gas) : MDS-Y4 C (gas) : MDS-Y2 • D (liquid) : MDS-Y2 E (liquid) : MDS-Y2 • D (gas) : MDS-Y4 E (gas) : MDS-Y4

  33. 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）

  34. Unit & Piping Selection Example 1m (12.70mm) 5m (9.52mm) 5m (9.52mm) 2m (6.35mm) MDS100B C A B WM10G WM10G CC25C 1m (9.52mm) 1m (6.35mm) 2m (6.35mm) 15m (9.52mm) D E WM10G CK20A WM20G 5m (6.35mm) 3m (9.52mm) 1m (6.35mm)

  35. Unit & Piping Selection Example Additional charge amount G : Formula: G = ∑ Li* Gi = (120 x 1) + (80 x 29) + (50 x 11) = 2990 g

  36. Unit & Piping Selection MDS unit selection software McQuay MDS unit selection software

  37. Unit & Piping Selection MDS control & monitoring software

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