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Yap BT email:yapbt@oyl.my

Yap BT email:yapbt@oyl.com.my. Virtual Room Simulator (VRSIM). Outline. Introduction to VRSIM - What is CFD - What is VRSIM - VRSIM Application - Problem Analyzed by VRSIM Case Solved by VRSIM - CASE 1: Air Throw Distance Estimation

james-blankenship
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Yap BT email:yapbt@oyl.my

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  1. Yap BT email:yapbt@oyl.com.my Virtual Room Simulator (VRSIM)

  2. Outline • Introduction to VRSIM • - What is CFD • - What is VRSIM • - VRSIM Application • - Problem Analyzed by VRSIM • Case Solved by VRSIM • - CASE 1: Air Throw Distance Estimation • - CASE 2: Unit Failure Analysis

  3. What is CFD? CFD (computational fluid dynamics) is a branch of fluid mechanics that uses numerical methods and algorithms to solve and analyze problems that involve fluid flows

  4. What is VRSIM? • OYL customized in-house CFD software for HVAC problem • To enable the result generate in short time by person who is not CFD expert. • Two version available: • VRSIM 2 - Simple block shape / Cartesian mesh, IAQ • VRSIM 3 - Complex shape / Tetrahedral / triangle mesh

  5. Problem Analyzed by VRSIM • Air Throw Distance & Air Flow Path • Temperature Distribution • Cooling time analysis • IAQ (Draught Risk, Draft Temperature, Predicted • Percentage Dissatisfied, Predicted Mean Vote) • Unit Failure Analysis

  6. CASE 1 Air Throw Distance

  7. CASE 1: Air Throw Distance Estimation Domain Layout Unit height = 3.0 m 4.0 m 8.0 m 8.0 m

  8. CASE 1: Air throw Distance Estimation WM15G ≈ 5.4 m

  9. CASE 1: Air Throw Distance Estimation • Compare with Experimental Data: Terminal velocity = 0.3 m/s Terminal velocity = 0.2 m/s

  10. CASE 2 Unit Failure Analysis

  11. CASE 2: Unit Failure Analysis Problem statement: 1) Outdoor unit is place close to each other/stack up to save space 2) Louver/wall to cover the outdoor unit from being see by the people, and often in limited space QUESTION: Will units fail due to short circuit/overheating? IF YES, WHO TO BLAME? (Both side will point finger to each other, for sure)

  12. CASE 2: Unit Failure Analysis • Instead of design failure or manufacturing fault, in most cases it is cause by layout design problem (blocking flow, lack of fresh air, etc) • To prove the short circuit happen, VRSIM can be one of the quick and low cost solution.

  13. CASE 2: Unit Failure Analysis Side Photo: BANNER WALL UNIT

  14. CASE 2: Unit Failure Analysis • Simulation domain: ATMOSPHERE SIDE GAP BANNER BUILDING WALL WALL UNIT (SL15C) FLOOR BOTTOM GAP

  15. CASE 2: Unit Failure Analysis 0.10 m BANNER 1.4 m 0.15 m 0.60 m 0.10 m • Assumption: • The grill effect is negligible when compare with banner. • The opposite side of the “WALL” is open (as no information is provided) • The gap around the banner is only approximated. • Ambient temperature is 35˚C. 0.15 m BANNER

  16. CASE 2: Unit Failure Analysis Result: Temperature Contour Side View

  17. CASE 2: Unit Failure Analysis Temperature vs Time Plot at specific point

  18. CASE 2: Unit Failure Analysis • Simulation Conclusion: • The outdoor unit is subjected to high temperature operating condition in long run. • Unit will not fail instantaneously as operating temperature still below maximum allowed (46˚C) • However, the life span of the compressor will definitely reduced due to continuous high temperature condition (40 – 42˚C)

  19. THANK YOU

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