Thermosiphon Beams Cai Wenjian Air T&D An engineering and - - PowerPoint PPT Presentation

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Thermosiphon Beams Cai Wenjian Air T&D An engineering and - - PowerPoint PPT Presentation

Nov 06, 2022 197 likes •390 views

Thermosiphon Beams Cai Wenjian Air T&D An engineering and consulting firm offering professional services 1 and analytical expertise to global HVAC engineering projects 2 Incorporated in March 2015 in Singapore. Spinoff from Green Cooling

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SLIDE 1

Thermosiphon Beams

Cai Wenjian

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SLIDE 2

1 2 3 4 5 6

An engineering and consulting firm offering professional services and analytical expertise to global HVAC engineering projects Incorporated in March 2015 in Singapore. Spinoff from Green Cooling & Air-conditioning Technologies (GCAT), a joint research program of EEE and ERI@N, NTU GCAT established in 1999 with target to achieve energy & environmental benefits through R&D World class R&D capabilities for energy efficient products development Several related international patents

Air T&D

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SLIDE 3

Fundamentals of TBs

  • Air Thermosiphon Effects
  • Air Entrainment (Nozzle)
  • Coandă Effect
  • Displacement Ventilation
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SLIDE 4

Cooling load profile of a typical room

Internal Cooling Load

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SLIDE 5

TB Products (p

(patented)

PTB-W ATB-W PTB-C ATB-C

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SLIDE 6

PTB –W

Code Length L (mm) Height H (mm) Width W (mm) Outlet width A (mm) Dry weight (Kg) PS200 1200 200 300 75 18 PN350 1200 350 300 100 22 PL510 1200 510 300 150 26 PE600 1200 600 300 150 30

100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 3100 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

2m 2.5m 3m 3.5m 4m

PTB Qa (W/m) ΔTc (˚C) L600

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SLIDE 7

PTB-C

ΔTc (˚C)

PTB-C510

100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 3100 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

600*1200 510*1200 350*1200 200*1200

Qw (W/m) Code Length L (mm) Height H (mm) Width W (mm) Outlet width A (mm) Dry weight (Kg) PS200 1200 200 600 150 27 PN350 1200 350 600 200 33 PL510 1200 510 600 300 39 PE600 1200 600 600 300 45

Disadvantages:

  • Low capacity, high cost
  • Not flexible to match the cooling load
  • Space required for fall duct
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SLIDE 8

ATB-W

Code Length L (mm) Height H (mm) Width W (mm) Outlet width A (mm) Dry weight (Kg) 1200L 1200 300 300 75 18 1200N 1200 450 300 100 24 1200H 1200 610 300 150 32

700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 3100 3200 3300 3400 3500 3600 3700 3800 3900 4000 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

2m 2.5m 3m 3.5m 4m

ΔTc (˚C)

Configuration - Nozzle L

ATB-W610 Many factors affect performance Total cooling is primary air + secondary air cooling

Qa (W/m)

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SLIDE 9

ATB-C

Code Length L (mm) Height H(mm) Width W (mm) Outlet width A (mm) Dry weight (Kg) 1200L 1200 300 600 150 27 1200N 1200 450 600 200 36 1200H 1200 610 600 300 48 Configuration - Nozzle L

ΔTc (˚C)

Qw (W/m)

TMTB-C610

900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 3100 3200 3300 3400 3500 3600 3700 3800 3900 4000 4100 4200 4300 4400 4500 4600 4700 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

610*1200 450*1200 300*1200

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SLIDE 10

DMTB

DMTB– add fan inside or outside PTB

fan off PTB fan on DMTB fan energy <10w

Model Length (L/mm) Width (W/mm) Height (H/mm) Weight (kg) PS200 1200 300 200 18 PN350 1200 300 350 22 PL510 1200 300 510 26 PE600 1200 300 510 30

DMTB: Fan performs three functions:

1) initialize or speed up formation of airflow circulation in startup phase; 2) provide better match load variation through control of air flow rate; 3) push air through coil and drop to floor level for heating applications

 Full fall duct becomes unnecessary

1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 3100 3200 3300 3400 3500 3600 3700 3800 3900 4000 4100 4200 4300 4400 4500 4600 4700 4800 4900 5000 5100 5200 5300 5400 5500 5600 5700 5800 5900 6000 6100 6200 6300 6400 6500 6600 6700 6800 6900 7000 7100 7200 7300 7400 7500 7600 7700 7800 7900 8000 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

2m 2.5m 3m 3.5m 4m

L510 Fan=150L/S

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SLIDE 11

TMTB

  • Fan on vent off
  • fan off
  • fan on

(dominant)

Tri-mode PDV Features

  • 1. (ATB) Ventilation air to enhance PTB performance
  • 2. Fan to provide better match load variation through control of the air flow rate
  • 3. Push air through coil and drop to the floor level for heating applications

 Full fall duct becomes unnecessary

Code Length L (mm) Height H (mm) Width W (mm) Outlet width A (mm) Dry weight (Kg) AS300 1200 300 300 75 18 AN450 1200 450 300 100 24 AL610 1200 610 300 150 32

Configuration – Fan 150 ( air flow = 150 L/S)

1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 3100 3200 3300 3400 3500 3600 3700 3800 3900 4000 4100 4200 4300 4400 4500 4600 4700 4800 4900 5000 5100 5200 5300 5400 5500 5600 5700 5800 5900 6000 6100 6200 6300 6400 6500 6600 6700 6800 6900 7000 7100 7200 7300 7400 7500 7600 7700 7800 7900 8000 8100 8200 8300 8400 8500 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

2m 2.5m 3m 3.5m 4m

ΔTc (˚C) Qw (W/m)

AL610

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SLIDE 12

Installation

Ceiling mounted without fall duct Basic installation integrated with furniture integrated with partition wall

  • Must be tightly sealed: air can only enter from heat exchanger and primary

air chamber (ATB, TMTB only), and exist from linear bar grill

  • Depth of fall duct is optimal designed, whole depth must be kept in any case
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SLIDE 13

Features

  • Energy saving:

 Need for the air recirculate to AHU plant room is eliminated

  • Better IEQ

 Better acoustics than mixed-flow systems  Better temperature gradient throughout the whole space (nature ventilation)  Higher ventilation effectiveness than mixed-flow systems (no short circuit)

  • Cost saving:

 Significant savings in terms of ceiling space  Much smaller foot print of primary air handling unit

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SLIDE 14

NTU Tutorial Rooms, TMTB

  • 12 tutorial rooms
  • Total over 600 m2
  • Cost savings
  • Energy savings
  • Good air quality
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SLIDE 15

PSA Tuas Terminal Maintenance Base Building

Provide ACMV Solution:

  • System design (including piping & ducting)
  • Supply terminal unit (more than 300 sets)
  • Installation
  • Testing and commissioning
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SLIDE 16

System Integration for Energy efficiency

  • Products
  • Air Treatment System (DOAS, patented)
  • Liquid Desiccant Air-Conditioning System
  • Dual Cycle Air-conditioning System
  • Intelligent Air Distribution System (patented)

Fan Working Solution Tank Control Valve Cooling Coil Air Filter Pump Cooling Coil Packing Strong Solution Buffer Demister

Compressor Condenser Evaporator Primary Heat exchanger Electric Expansion valve Chilled water 7 °C

V-11

T1,RH1 T5,RH5 T4,RH4 T2,RH2

Heat Pump

Vair EC fan T3,RH3 Three-way valve

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SLIDE 17

Thank you !