Continuing Professional Development (CPD) Saving Energy and the Environment with the latest developments in Heat Pipe Technology CIBSE Approved
CONTENTS What is a Heat Pipe Heat Pipes for Energy Recovery Comparison with alternative systems Heat Pipes for Cooling and Dehumidification The benefits of using Water as a Working Fluid Conclusions Questions and discussion
What is a Heat Pipe?
What is a Heat Pipe? Transferred heat Applied Heat
Applications Computer Cooling
Working Fluid Refrigerant R134A Operating temperature - 50 C to + 60 C New SPC Water Technology Operating temperature 0 C to + 160 C Increased efficiency Completely eco friendly
Applications Heat Pipes for Energy Recovery
Application Pre-Cool 43 C Intake 33 C 33 C 23 C Extract
Double deck AHU with energy recovery heat pipe
Horizontal Heat Pipes
Alternatives Run around Coils Can be used where ducts are some distance apart. No cross contamination. Summer and winter usage. Pumps and associated power and maintenance requirement. Typical effectiveness 40 45%
Alternatives Crossflow plate heat exchanger No cross contamination No moving parts Difficulties with moisture collection and cleaning Bulky, particularly with larger air volumes Typical effectiveness 50 55%
Alternatives Thermal wheels Cross contamination of airflows Energy and maintenance for motors belts and sealing bushes Typical effectiveness 70 75% (But requires high latent load) High pressure drops > 200 Pa Specific Fan Power calcs Price
Heat Pipes for Energy Recovery Advantages :- High efficiency (R134A 55-60%, Water 60 65%) No Moving parts No direct energy requirement Low Air Pressure drop Zero cross contamination Easy condensation drainage Compact Virtually maintenance free Easy to clean
IT RACK IT RACK Applications Data Centres :- Free ambient cooling FAN HEAT PIPE OUTSIDE AIR FAN
Applications Heat pipes for Cooling / Dehumidification
Heat Pipes For Cooling \ Dehumidification ASHRAE Recommended Safety margin Health Problems Mildew Growth 0 10 20 30 40 50 60 70 80 90 100 % Relative Humidity
Heat Pipes For Cooling \ Dehumidification
Heat Pipes For Cooling \ Dehumidification Traditional System Warm humid air, 33 C Saturated air, 18 C Condensation
Heat Pipes For Cooling \ Dehumidification Using Reheat Warm humid air, 33 C 12 C Comfortable air, 18-22 C Condensation Reheat Coil
Heat Pipes For Cooling \ Dehumidification
Adding a Heat Pipe The heat pipe improves the efficiency of the system by pre-cooling and reheating the air 18 C 33 C 27 C 12 C
Heat Pipe Dehumidification wrapped around cooling coil Plan view of cooling coil. Heat Pipe pre-cool Airflow Cooling Coil Heat Pipe re-heat Airflow 33/26 C 27/24.5 C 12/11.8 C 18/14.1 C
Heat Pipes For Cooling \ Dehumidification
Heat Pipes For Cooling \ Dehumidification
Heat Pipes For Cooling \ Dehumidification
Large Horseshoe Heatpipe
Heat Pipes For Cooling / Dehumidification
Energy Recovery Software
Energy Recovery Software
Dehumidification Software
Projects Shopping Centre - Dubai
Projects Royal mirage Hotel - Dubai
Projects - UK British Museum - London Royal Victoria hospital N. Ireland
Projects One Peking Rd Hong Kong
Projects Ocean Park- Hong Kong
Improving IAQ and Energy Saving by using energy efficient Water Heat Pipes D E H U M I D I F I C AT I O N AND ENERGY RECOVERY R E F R I G E R A N T F R E E FOR GREENER BUILDINGS
Water Heat Pipes Why should we want to use water as a working fluid?
Water Heat Pipes Proven 18% improved effectiveness over refrigerant Greenest working fluid available GWP of Water = 0, R134a = 1430, R410a = 2088 Safe in any environment More cost effective
Water Heat Pipes How do we know water is better?
Sample Test Result Sample Comparative Test Result for 2 row test piece using R134a and Water Air Velocity (m/s) 2.3 2.5 Working Fluid R134a Water R134a Water (T 1 - T 2 ) 6.2 7.7 5.2 6.8 (T 4 - T 3 ) 6.1 7.3 5.6 6.6 Effectiveness (%) 19.9 23.62 19.5 22.77 % Increase 18.69% 16.77% The comparative results obtained show percentage effectiveness improvements of between 16% and 18%. SPC patented method of manufacture utilising water rather than refrigerant
Water Heat Pipes Why do we get better results using water as a working fluid?
Water as Working Fluid? High Latent Heat Latent heat is the amount of energy absorbed as a given mass of the fluid changes phase from liquid to vapour. Higher latent heat gives better heat transporting capacity of the working fluid The latent heat of water is approximately 14 times that of R134a, accordingly there is 14 times less mass transfer required to transfer the same heat between the ends of the heat pipe.
Water as Working Fluid? High thermal conductivity Better heat transfer for a given temperature differential Reduction in temperature gradient High efficiency
Water Heat Pipes How do we get water to boil at below 100 degrees Celsius? I.E Everest?
Water as a Working Fluid Boiling Temperature of water at sea level 100 C Boiling temperature of water on Everest 68 C
Water Phase Change
Water Heat Pipes Internal heat pipe pressure changes with temperature At 20 o C Saturation Vapour Pressure for Water = 0.02Bar R134a = 6 Bar, R410a = 15 bar At 45 o C SVP for water=0.1 bar, R134a = 12 bar, R410a=28 bar
Water Heat Pipes What are benefits of using water?
Benefits of WHP Better performance results in:- Reduction in number of rows/fpi required Reduction in size/cost Reduced air side pressure drop Lower internal working pressure
Benefits of WHP Green and Eco-Friendly Water is harmless to the environment Reduction of carbon footprint in manufacturing heat pipes Water has zero Global Warming Potential (GWP) & Ozone Depletion Potential (ODP) Gain more points in LEED & BREEAM Certification
Conclusions Heat Pipes are: Very Efficient conductors of heat Can dramatically increase the amount of moisture removed in humid climates Allow energy recovery with zero cross contamination Reduce running costs, fast pay-back
Now Available on www.spcoils.co.uk/bim Heat Pipes MINIB Trench Heaters Belgravia Fan\Natural Convectors Coil Heat Exchangers Created by BIM Technologies (BIMStore) who are part of the Space Group Created in AutoDesk Revit 2013 by a certified AutoDesk engineer COBie UK 2012, BS1192 and AEC(uk) compliant Links for product information Ductwork, Pipework & Electrical connectors available for MEP projects
Thank You Any Questions?