HVAC Product Update (DCBL Fan Coil Unit)
HVAC Product Update (DCBL Fan Coil Unit)
HVAC Product Update (DCBL Fan Coil Unit)
- No tags were found...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Energy Solutions on Airside Systems<strong>DCBL</strong> VAV Stepless <strong>Fan</strong> <strong>Coil</strong> <strong>Unit</strong>sDate : 9 th May, 2012
Airside SystemsVariable Air Volume Systems, constant temperature• Equipment– Air handling units/ VAV boxes• Control method– Frequency inverters/ air valves• Advantages– Better space temperature and humidity control– Quiet operation• Applications– Multi-zone systems3Energy Solutions on Airside Systems
Airside SystemsCombined systemsvariable-speed drivesupplyfancoolingcoilOASAthermostatRAspace4Energy Solutions on Airside Systems
Airside EquipmentMethodologyAC Motor w/ VFDDC Brushless MotorNo brusher, maintenance is easierStrengthWeaknessModulating styleMotor assembly is easierSave fan energy at low frequencyLow power factor, inefficient current isrelative higher, cause high temp. riseShort life cycleBigger sizeCompact size, weight is lowerHigher efficiency, low temp. riseReliability is higherModulation controlComplex system, cost is higher5Energy Solutions on Airside Systems
Airside EquipmentVAV Stepless <strong>Fan</strong> <strong>Coil</strong> <strong>Unit</strong>s• Airflow range: 200 ~ 1400 cfm• Applications: Offices, hotels,luxury apartments• Features & benefits:– DC brushless motor, highefficiency– Non-stage variable speed– Quiet operation– Comfortable, constanttemperature & humiditycontrol– PI control, fast response tothe load change6Energy Solutions on Airside Systems
Energy SavingEnergy Conversion EfficiencyEnergy Conversion EfficiencyDC motor saving 50~60%40%30%80%AC MotorDC Motor7Energy Solutions on Airside Systems
Energy SavingSame RPMLess WattSize 08 & 06PSC vs. <strong>DCBL</strong> VAV FCU(HFCF06 normal static)Speed (RPM)Hi (940)Med. (750)Low (640)A-Low (340)8Energy Solutions on Airside SystemsPSC (P in )81.2 W69.9 W56.7 W---<strong>DCBL</strong> (P in )58 W25.8 W16.7 W> 16.7 WSaving (%)-28.6 %-63.1 %-70.5 %< -70.5%
Quiet Operations• Acoustic design for different type of spacesSpace typeResidencesHotels, motelsOffice buildingsApartmentsIndividual rooms or suitesMeeting/banquetCorridors, lobbies, service/support areasExecutive/private officesConference roomsTeleconference roomsOpen-plan officesCorridors and public lobbiesRecommended NC25 to 3525 to 3525 to 3535 to 4525 to 3525 to 3525 (max)30 to 4040 to 459Energy Solutions on Airside Systems
Acoustic ResultsAt Medium speed70Sound Pressure, dB6050403020100AC FCU NC35 to 45<strong>DCBL</strong> < NC2063 125 250 500 1000 2000 4000 8000Frequency, HzNC45NC40NC35NC30NC25NC20NC1510Energy Solutions on Airside Systems
Constant Temperature ControlTypical FCU versus <strong>DCBL</strong> VAV FCUTypical fan coil / RPMSet point<strong>DCBL</strong> / RPMRM temp. w/<strong>DCBL</strong>RM temp w/ typ. FCU11Energy Solutions on Airside Systems
Test Results – Room Temp.Typical FCU with on/off valve controlSlight fluctuation in DB temperature12Energy Solutions on Airside Systems
Test Results – Room Temp.VAV FCU with on/off valve controlStable temperature13Energy Solutions on Airside Systems
Test Results - RHTypical FCU with on/off valve controlRH% fluctuates (68-78%)14Energy Solutions on Airside Systems
Test Results - RHVAV FCU with on/off valve controlStable RH% (70%)15Energy Solutions on Airside Systems
Better Humidity ControlPart-load space conditionsCV system =23.9°C, 66% RHVAV system =23.9°C, 58% RHCADBmixed airhumidity ratio12.8°C15.6°C23.9°C16 Energy Solutions on Airside Systemsdry-bulb temperature
Control LogicFast response to load changeReturn air temperature sensor locationStabilize the room temp. within ±0.5 o Cin ‘Auto” mode17Energy Solutions on Airside Systems
Control LogicProportional, Integration (P-I) Logic for Modulation• DC Motor RPM = (Kp x ∆T) + (Ki x ∫ ∆Tdt)PI 比 例 積 分 控 制馬 達 轉 速溫 差 大溫 差 中溫 差 小時 間18Energy Solutions on Airside Systems
Pilot Project from EMSDTrade & Industrial Department Tower19Energy Solutions on Airside Systems
ResultsSaving ~ 35%20Energy Solutions on Airside Systems
Building Energy CodeComply or not?6.7.5 The requirement in clauses 6.7.1and 6.7.2 should not be applicable to(a)A system with system fan motorpower less than 5 kW; or21Energy Solutions on Airside Systems
Building Energy CodeComply or not?̌̌̌̌̌̌̌22Energy Solutions on Airside Systems
Job ReferenceProject Client/ Consultant/ Contractor Qty YearGrand Hyatt Hotel Grand Hyatt 20 200439 Island Road Liu Chong Hing 28 2005Amber Garden Landrich 5 2005American Club American Club 33 2005Grand Hyatt Hotel Grand Hyatt 1 2005Knowles Building, HKU HKU 4 2005Luk Kwok Hotel Luk Kwok Hotel 2 2005Lanson Place USI Property 6 2006Chong Hing Bank Building Liu Chong Hing 33 200610 Cooper Road, Jardine’s Lookout Arnlee 5 2006Trade & Industrial Department Tower EMSD 23 2006The Repulse Bay The Repulse Bay > 50 2007Printing Division EMSD 15 2008<strong>Unit</strong>ed Centre 18 2008Warwick House, Taikoo Place Swire 3 2008Kwai Chung Hospital EMSD 25 2010On Lai Street, Shatin Hotel Nan Fung 604 201123Energy Solutions on Airside Systems> 875 qty
Questions & Answers24Energy Solutions on Airside Systems
Change language