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Ducted Units Training 2010

Ducted Units Training 2010. Special acknowledgment and thanks to Holyoake Air Management Solutions for their assistance and product support during the development of this training course. Jason Roberts. Training Manager. Welcome Ducted Systems for the home. What are we going to show you.

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Ducted Units Training 2010

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  1. Ducted Units Training 2010 Special acknowledgment and thanks to Holyoake Air Management Solutions for their assistance and product support during the development of this training course.

  2. Jason Roberts Training Manager

  3. WelcomeDucted Systems for the home. • What are we going to show you. • How to select ducted units for the home • How to size ductwork – (using the duct sizing disc) • How to understand airflow and its relationship to capacity. • Recommendations for ducting installation. • What are we going to give you. • Computer Software • Manual • Duct Sizing Disc

  4. SOME INTERESTING FACTS!

  5. DUCTEDSALES STATS – MEASURED INDUSTRYUNIT NUMBERS

  6. DUCTEDUNIT TYPES – MEASURED INDUSTRYSALES NUMBERS

  7. ESTIMATED INSTALL VALUESMEASURED INDUSTRY - 2009 $32,859,000,00

  8. Ducted Unit SelectionWhat do we need to calculate? Total Heating / Cooling capacity required Airflow required for each room Duct work size to accommodate this airflow Static pressure of the ductwork Outlet diffuser size Return duct Size Return grille size Ducted units can never be selected on kW capacity information only

  9. Free SoftwareDuct-Calc • Calculates the size of the Fujitsu heat pump unit. • Calculates system design Pascal rating • Calculates airflow required • Calculates the additional capacity from fresh air. • Calculates correct size supply diffuser and quantity required for each area. • Built in airflow capacity calculator • Built in commissioning tool for calculating airflow through room outlets. • System Drawings • Plus much more…

  10. Airflow delivered to one target area. • Single room cooling / heating. • Capacity is adjusted by compressor output • (Inverters) • On view • Airflow delivered to many areas • Smaller awkward areas can be conditioned. • Whole house ventilation possible- improving health. • Delivered cooling / heating capacity dependent on airflow • which is affected by many factors Wall Mounted v Ducted System

  11. AirflowMeasurements VOLUME VELOCITY SPEED OF AIR AMOUNT OF AIR • m3/sec (metres cube / second) • m3/min (metres cube / minute) • m3/hr (metres cube / hour) • cfm (cubic feet / minute) • l/sec (litres / second) m/sec (metres / second) Duct Area x Velocity = Volume (Calculation to determine airflow) Software helps here!

  12. Larger ducts allow more air volume to pass through at a lower velocity… this increases the capacity of cooling / heating and the systems efficiency. FundamentalsCapacity V Airflow Small ducts will reduce the cooling / heating capacity delivered Its’ Quieter Too! INCORRECT SELECTED DUCT SIZE (TOO SMALL) = REDUCED AIR VOLUME / INCREASED PRESSURE DROP = INCREASED VELOCITY / NOISE = LESS EFFICIENT

  13. Airflow / Capacity • As we know ducted systems deliver heating and cooling to a room via the amount of airflow delivered. • We therefore calculate how much airflow we need to deliver the correct amount of heating or cooling. This required airflow is affected by:- Duct Size Duct Length Number of duct bends Supply Air Diffusers Return Air Grilles This is referred to as the system pascal rating

  14. Pa Pascal – (Measure of Pressure) • Reduction in duct size = Increase Pascal rating • Increase Length of duct = Increase Pascal rating • Bends = Increase Pascal rating. • Diffusers / Grilles = Increase Pascal rating. • The ducted unit must be selected to overcome the Pascal rating • and provide enough air volume for heating and cooling. Software will help! 1 x 90 deg bend = approx 3metre of straight duct.

  15. FundamentalsAir Diffusers Supply air diffusers also add restriction to the overall system Pa. This is taken into account during selection. Ensure correct size of supply air diffusers are selected. This is calculated using selection charts referring to Pa. Duct-Calc does this for you!

  16. In PracticeCalculate total system Pascal Longest length of supply duct (2 Pascal per metre) Plus Longest length of return duct (2 Pascal per metre) Plus Number of bends in longest run Plus Type of diffuser (size) on longest run = PASCAL RATING OF THE SYSTEM

  17. Ducted UnitsModel Range LOW - MED STATIC HIGH STATIC BULK HEAD • 0 – 90 PA • 5kW CAPACITY • SUITABLE FOR LIMITED DUCT RUNS ONLY • FLOOR / CEILING MOUNT • 30– 150 PA • 7 – 12kW CAPACITY • CEILING MOUNT ONLY • 30– 200PA (250PA- 45&54) • 8 – 14.5kW CAPACITY • CEILING MOUNT ONLY

  18. Install Parts - Components • Supply Diffusers • Return Grille – New styles to hide filter. • Flexible Ductwork • Commissioning Dampers • Duct Ties • Duct Supports • Duct Tape

  19. Example of Flexible Duct • All ducts should be pulled straight and supported with wide straps – (never wire or string) at regular intervals • When attaching to diffusers keep duct supported.

  20. Airflow can easily become restricted if flexible pipe is allowed to sag. A good solution is a support clip like the one above provided by Flexaboot.com.

  21. Capacity Correction

  22. AIRLFLOW – ART30/36 HIGH STATIC (05-19) INCREASE STATIC = LOWER AIRFLOW

  23. Capacity Correction • Every system’s performance is calculated at the following conditions. • High Fan Speed – At a reference Pa. ie ART36 2500m3/hr (694L/sec @100pa) • 7.5 metre Pipe Run • Cooling • Indoor 27oC DB / 19oC WB Outdoor Temp : 35oC • Heating • Indoor 20oC DB • Outdoor Temp : 7oCDB / 6oC WB Corrections made for operation in New Zealand will affect these performance figures

  24. ART45 - CAPACITY COOLING HEATING

  25. FREE - Fujitsu Duct-Calc Program

  26. 3400 1400 10 Metres Lounge Dining 1400 1200 Bedroom Study Playroom 1000 12 Metres

  27. Desk O O Wardrobe P O P Wardrobe Position of supply diffuser The diffuser in the correct position will not blow directly on anyone or bounce off walls. Its also far enough away from the door to prevent short cycle.

  28. 177 L/sec 3400 1400 73 L/sec 10 Metres Lounge Dining 1400 73 L/sec 1200 63 L/sec Bedroom Study Playroom 1000 52 L/sec 12 Metres

  29. 177 L/sec 73 L/sec 10 Metres Lounge Dining 73 L/sec Bedroom 63 L/sec Study Playroom 52 L/sec 12 Metres

  30. 177 L/sec 73 L/sec 10 Metres Lounge Dining 73 L/sec 63 L/sec Bedroom Study Playroom 52 L/sec 12 Metres

  31. 177 L/sec 73 L/sec 10 Metres Lounge Dining 73 L/sec 63 L/sec Bedroom Study Playroom 52 L/sec 12 Metres

  32. 177 L/sec 73 L/sec 10 Metres Lounge Dining 73 L/sec 63 L/sec Bedroom Study Playroom 52 L/sec 12 Metres

  33. 10 Metres Lounge Dining Bedroom Study Playroom 12 Metres

  34. 10 Metres Lounge Dining Bedroom Study Playroom 12 Metres

  35. Selecting Diffusers 200 = UPTO 100 L/sec 250 = UPTO 150 L/sec 2 x 200 = UPTO 200 L/sec 2 x 250 = UPTO 300 L/sec DuctCalc program does this for you!

  36. Ducted SystemsSelection / Application CUSTOMER BIT BEFORE YOU PROCEED • What will the installed system consist of – component parts including remote control. • Show the customer the discharge grilles – Efficiency is the driver! • Show the customer the return grille size • Access for installation.

  37. Ducted SystemsSelection / Application YOUR BIT • Is there room for the indoor unit – Is there loft space. • What is the access to the roof space. • Location of diffusers and return air grille in relation to the indoor unit. • Position of the ductwork. Can the runs be kept fairly straight with few right angles. • Can the discharge dampers be accessed for commissioning after installation. • Location of outdoor unit. • How far from the indoor • Noise isolation from buildings • Is the customer fully aware and in agreement to having the diffusers installed in the best position or a compromise!

  38. Ductwork Sizing & Layout • Ductwork size must be selected to reduce airflow restriction to a minimum. • All bends and pipe sagging must be kept to a minimum. • Airflow to each supply diffuser preferably adjustable. • Return air is as important as the supply. The return grille must be correctly sized and positioned.

  39. Your Duct Sizing Disc

  40. EXERCISE 1 ROOM 1 73 ROOM 2 78 ROOM 3 188 339 l/sec

  41. EXERCISE 1 - ANSWER 300mm ROOM 1 200mm 73 200mm ROOM 2 250mm 78 ROOM 3 188

  42. 150mm EXERCISE 2 Customer complains of noisy system. Use the Duct-Sizer to diagnose the problem. 8.0 m/sec Velocity reading = 8.0m/sec What is the Air Volume = If applying the correct velocity of 4.5 m/sec what should the maximum air volume be = What duct size is correct for the actual air volume measured.

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