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

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 & Air-conditioning Technologies 3 (GCAT), a joint research program of EEE and ERI@N, NTU 4 GCAT established in 1999 with target to achieve energy & environmental benefits through R&D World class R&D capabilities for energy efficient products 5 development 6 Several related international patents

Fundamentals of TBs  Air Thermosiphon Effects  Air Entrainment (Nozzle)  Coandă Effect  Displacement Ventilation

Internal Cooling Load Cooling load profile of a typical room

ATB-C PTB-C PTB-W TB Products (p (patented) ATB-W

3100 PTB – W 3000 2900 2800 2700 2600 2500 2400 2300 2200 2100 2000 Qa (W/m) 1900 1800 1700 1600 1500 1400 1300 1200 1100 1000 900 800 700 600 500 400 300 200 100 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2m 2.5m 3m 3.5m 4m ΔTc (˚C) L600 PTB Code Length L (mm) Height H (mm) Width W (mm) Outlet width A (mm) Dry weight (Kg) 1200 300 75 PS200 200 18 PN350 1200 350 300 100 22 PL510 1200 510 300 150 26 PE600 1200 600 300 150 30

3100 PTB-C 3000 2900 2800 2700 2600 2500 2400 2300 2200 2100 2000 1900 1800 Qw (W/m) 1700 1600 1500 1400 1300 1200 1100 1000 Disadvantages: 900 800 700 • 600 Low capacity, high cost 500 400 • Not flexible to match the cooling load 300 200 100 • 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Space required for fall duct 600*1200 510*1200 350*1200 200*1200 ΔTc (˚C) PTB-C510 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

ATB-W Configuration - Nozzle L 4000 3900 3800 3700 3600 3500 3400 3300 3200 3100 3000 Qa (W/m) 2900 2800 2700 2600 2500 2400 2300 2200 2100 Many factors 2000 1900 affect performance 1800 1700 1600 1500 1400 Total cooling is 1300 1200 1100 primary air + 1000 900 secondary air 800 700 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 cooling 2m 2.5m 3m 3.5m 4m ΔTc (˚C) ATB-W610 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

ATB-C Configuration - Nozzle L 4700 4600 4500 4400 4300 4200 4100 4000 3900 3800 3700 3600 3500 3400 Qw (W/m) 3300 3200 3100 3000 2900 2800 2700 2600 2500 2400 2300 2200 2100 2000 1900 1800 1700 1600 1500 1400 1300 1200 1100 1000 900 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 610*1200 450*1200 300*1200 ΔT c (˚C) TMTB-C610 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

8000 DMTB 7900 7800 7700 7600 7500 7400 7300 7200 7100 7000 6900 6800 6700 6600 6500 6400 6300 6200 6100 6000 5900 5800 5700 5600 5500 5400 5300 5200 5100 5000 4900 4800 4700 4600 4500 DMTB – add fan inside or outside PTB 4400 4300 4200 4100 4000 3900 3800 fan off PTB fan on DMTB fan energy <10w 3700 3600 3500 3400 3300 3200 3100 DMTB: Fan performs three functions: 3000 2900 2800 2700 2600 2500 1) initialize or speed up formation of airflow circulation in startup phase; 2400 2300 2200 2100 2000 2) provide better match load variation through control of air flow rate; 1900 1800 1700 1600 1500 3) push air through coil and drop to floor level for heating applications 1400 1300 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2m 2.5m 3m 3.5m 4m  Full fall duct becomes unnecessary Model Length (L/mm) Width (W/mm) Height (H/mm) Weight (kg) L510 Fan=150L/S PS200 1200 300 200 18 PN350 1200 300 350 22 PL510 1200 300 510 26 PE600 1200 300 510 30

Configuration – Fan 150 ( air flow = 150 L/S) 8500 TMTB 8400 8300 8200 8100 8000 7900 7800  Fan on vent off 7700 7600 7500 7400 7300 7200  fan off 7100 7000 6900 6800 6700  fan on 6600 6500 6400 6300 6200 Q w (W/m) (dominant) 6100 6000 5900 5800 5700 5600 5500 5400 5300 5200 5100 5000 4900 4800 4700 4600 4500 4400 4300 4200 4100 4000 3900 3800 Tri-mode PDV Features 3700 3600 3500 3400 3300 1. (ATB) Ventilation air to enhance PTB performance 3200 3100 3000 2900 2800 2700 2. Fan to provide better match load variation through control of the air flow rate 2600 2500 2400 2300 2200 3. Push air through coil and drop to the floor level for heating applications 2100 2000 1900 1800 1700 1600 1500  Full fall duct becomes unnecessary 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2m 2.5m 3m 3.5m 4m ΔT c (˚C) Code Length L (mm) Height H (mm) Width W (mm) Outlet width A (mm) Dry weight (Kg) AL610 AS300 1200 300 300 75 18 AN450 1200 450 300 100 24 AL610 1200 610 300 150 32

 Must be tightly sealed: air can only enter from heat exchanger and primary Installation 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 Basic installation Ceiling mounted without fall duct integrated with furniture integrated with partition wall

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

NTU Tutorial Rooms, TMTB  12 tutorial rooms  Total over 600 m 2  Cost savings  Energy savings  Good air quality

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

System Integration for Energy efficiency Heat Pump Chilled water 7 °C  Products V-11 Electric Three-way Expansion valve valve • T5,RH5 Air Treatment System (DOAS, patented) Vair T4,RH4 T2,RH2 T3,RH3 T1,RH1 -Liquid Desiccant Air-Conditioning System EC fan -Dual Cycle Air-conditioning System Primary Heat Evaporator Condenser Compressor exchanger • Intelligent Air Distribution System (patented) Fan Cooling Coil Strong Solution Buffer Packing Control Demister Valve Cooling Air Filter Coil Working Solution Tank Pump

Thank you !