MDS Selection

Contents Introduction Selection Consideration Selection Process Software Demonstration

Introduction

Sample of Installation

Selection Consideration

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

Restriction of Piping Length

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 Factor to Consider Criteria 1 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). 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 more than 90% of the maximal real length. 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 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

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

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

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

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

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

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

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

Selection Process

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

Unit & Piping Selection Example Requirement Cooling only model Ambient temperature : 40.0 °C Indoor temperature : 21.0 °C Other Information Piping length：70m Height between I/O：4m Outdoor Unit located below indoors

Unit & Piping Selection Indoor Requirement

Unit & Piping Selection Example Total Indoor capacity is 32.3 kW

Unit & Piping Selection Example Selection Criteria Total Indoor capacity must be range between 50% ~ 120% of the outdoor capacity. We recommend that the outdoor capacity equals to the total indoor capacity or a little larger than the indoor capacity

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

Unit & Piping Selection Example Selected Outdoor and Indoor Model

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

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

Unit & Piping Selection Example Total Capacity = Outdoor Capacity X Outdoor Capacity Factor X Piping length & height Factor = 32.5 kW X 1.03 X 94% = 31.47 kW Comply to requirement

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

Unit & Piping Selection Example Selection pipe diameter MDS120B A B C WMD 20G CCD 25C WMD 10G 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

Unit & Piping Selection Refrigerant Pipe Specification : MDS-B

Unit & Piping Selection Example Downstream capacity Point A A-B-C : 14.9 kW A-D-E : 17.4 kW Point B B-C : 8.4 kW D-E : 8.4 kW Main pipe diameter : ø 15.88mm / ø 28.6mm MDS120B A B C WMD 20G CCD 25C WMD 10G 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

Unit & Piping Selection Refrigerant Pipe Specification : MDS-B Point A A-B-C : 14.9 kW A-D-E : 17.4 kW

Unit & Piping Selection Example Main pipe diameter : ø 15.88mm / ø 28.60mm A-B diameter : ø 9.52mm / ø 19.05mm MDS120B A B C WMD 20G CCD 25C WMD 10G 5.6 kW 2.8 kW 6.5 kW D E CKD 30A WMD 10G A-D diameter : ø 12.70mm / ø 22.23mm WMD 20G 2.8 kW 9.0 kW 5.6 kW

Unit & Piping Selection Example Point B B-C : 8.4 kW B-CCD25C : 6.5 kW MDS120B A B C WMD 20G CCD 25C WMD 10G 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

Unit & Piping Selection Refrigerant Pipe Specification : MDS-B Point B B-C : 8.4 kW B-CCD25C : 6.5 kW (follow indoor pipe size)

Unit & Piping Selection Example A-B: ø 9.52 / ø 19.05 B-C: ø 9.52 / ø15.88 B-CCD25C: ø 9.52 / ø15.88 MDS120B A B C WMD 20G CCD 25C WMD 10G 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

Unit & Piping Selection Example

Unit & Piping Selection Example Main Pipe: ø 15.88 / ø 28.6 A-B: ø 9.52 / ø19.05 B-C: ø 9.52 / ø15.88 MDS120B A B C WMD 20G CCD 25C WMD 10G 5.6 kW 2.8 kW 6.5 kW D E CKD 30A WMD 20G 5.6 kW WMD 10G 2.8 kW 9.0 kW A-D: ø12.7 / ø22.23 D-E: ø9.52 / ø15.88

Unit & Piping Selection Example All unit in mm Selection of branch A-B diameter : ø 9.52 / ø 19.05 Main Pipe diameter : ø 15.88 / ø 28.60 A Select the refnet joint of point A A (liquid) : MDS-Y2 A (gas) : MDS-Y1 A-D diameter : ø 12.70 / ø 22.23

Unit & Piping Selection Example Main Pipe: ø 15.88 / ø 28.6 A-B: ø 9.52 / ø19.05 B-C: ø 9.52 / ø15.88 MDS120B A B C WMD 20G CCD 25C WMD 10G 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 A-D: ø12.7 / ø22.23 D-E: ø9.52 / ø15.88

Unit & Piping Selection Example MDS120B A B C WMD 20G CCD 25C WMD 10G 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

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）

Unit & Piping Selection Total Piping Length 15.88mm – 10m 12.7mm – 25m 9.52mm – 21m 6.35mm – 14m Example ø 15.88 (10m) ø 9.52 (5m) ø 9.52 (2m) ø 9.52 (4m) ø 6.35 (2m) MDS120B ø 6.35 (5m) A B C WMD 20G CCD 25C WMD 10G 5.6 kW 2.8 kW ø 12.7 (25m) 6.5 kW ø 6.35 (2m) D E ø 6.35 (5m) ø 9.52 (5m) CKD 30A WMD 20G WMD 10G ø 9.52 (5m) 9.0 kW 5.6 kW 2.8 kW

Unit & Piping Selection Example Total Piping Length 15.88mm – 10m 12.7mm – 25m 9.52mm – 21m 6.35mm – 14m 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) = (10 X 180) + (25 x 120) + (21 x 80) + (14 x 50) = 7180 g Liquid tube diameter (mm) 6.35 9.52 12.7 15.88 Refrigerant charge amount (g/m) 50 80 120 180

Unit & Piping Selection Electronic Expansion Valve EXV Box

Unit & Piping Selection Electronic Expansion Valve 2 units 2 units 1 unit 1 unit

Software Demonstration

Unit & Piping Selection

The End