CAPRI Cables Private Limited Manufacturers of HEAT PIPE
CAPRI Cables Private Limited Manufacturers of: HEAT PIPE based Thermal Devices 1
The Company. . . § Has a full fledged manufacturing set-up to produce 130, 000 Nos. of Heat pipes per annum. and is Located in the outskirts of Hyderabad. § Project started in 2004. Commercialization achieved in 2007. § Infrastructure expansion underway - to be completed by Dec’ 11. § From a turnover of 4 Cr in the previous financial year, the company is set to achieve a turnover of 9 Cr in the current financial year. 2
Products. . . § CAPRI has developed and manufactures following products based on Heat pipe technology: 1. Heat pipe based heat sinks (forced & natural cooled) in 10 W to 5 k. W capacity. 2. Heat pipe stacks for heat recovery and de-humidification. 3. Heat pipe based heat exchangers as Panel & Cabinet coolers 3
What is a Heat Pipe ? n A heat pipe is an extremely efficient conductor of heat. It comprises two basic components : 1) - A sealed container 2) - A working fluid n By using the latent capacity of the fluid the heat pipe can transfer large amounts of heat, very quickly. 4
Basic principle of operation A simple heat pipe comprises a hollow tube partly filled with a working fluid Using the latent capacity of the fluid, we can transfer large amounts of heat very rapidly from a hot point to a cold point on the tube wall. Heat out Heat in 5
Basic principle of operation. . . 6
Summary of characteristics n n n Heat is transferred by latent means giving a heat transfer rate of around 1000 times that of a solid copper rod Vaporisation and condensation take place at the same temperature allowing high heat transfer at low temperature differences Heat pipes without wicks (Thermosyphons) rely on gravity to return the condensed liquid. 7
Heat Pipe Heatsinks Applying the principle of heat pipes to heat sinks, a far superior dissipation of heat can be achieved. CAPRI manufactures following Heat Pipe based heatsinks. • Natural Convection – in range of 10 W to 4. 5 k. W and, • Forced Convection – in range of 100 W to 5 k. W. 4 k. W FC Heat sink for Railway locomotives 1 k. W FC Heat sink for BHEL 8
Characteristics of Heat pipe heatsinks Comparison of conventional sinks with Heatpipe heatsinks n n n n High thermal conductance - higher wattage removed. Capability to control thermal flux. 20 to 40% reduction in weight and volume. Very long life (>10 -20 years). Cost comparable to conventional extruded heat sinks. No maintenance – No moving parts. No restriction on orientation of heat sink. 9
Heat pipes & Heat recovery For heat transfer between supply & Exhaust air Best suitable when high volumes of air is involved and when there is large temp difference between exhaust & supply air Heat pipe stack is inserted in duct in either horizontal or vertical orientation in a counter flowing air stream 10
Heat pipes & Heat recovery. . . n Requires no energy to run n No maintenance n No cross contamination n Can be sized to suit the ductwork or AHU n Small footprint n Easy condensation removal n Significant Energy Savings. 11
Dehumidifying with coils Generally the air is overcooled 11°C Warm humid air, 28°C Drier, overcooled Comfortable air, 11°C 16°C Condensation 12
Adding a Heat Pipe The heat pipe improves the efficiency of the system. 16°C 28°C 23°C 11°C 13
Heat Pipe In Practice o 28 / 20 C 23 / 18. 3 o. C o 11 / 10. 8 o. C 16 / 12. 9 C Airflow 14
Summary n n n Requires no energy to run, “driven” by the cooling coil Nett energy savings of around 33% compared to standard cooling and reheat Lower cooling load = smaller chiller/compressor Simple to specify Easy installation Controlled by the cooling coil. 15
Enclosure cooling n n n The Heat Pipe transfers unwanted heat generated within the enclosure to the outside environment. The Heat Pipe is mounted such that warm internal air is circulated over one side and cooler outside air is blown over the other side Cools without the ingress of external air and its associated contaminants. 16
Cooling an electrical enclosure Enclosure Heat Pipe Q Equipment generating unwanted heat 17
Cooling an electrical enclosure & cabinet CAPRI Panel coolers are available as: n n n Slide-in type – for smaller heat loads – up to 500 W Clamp-on type – for medium heat loads – up to 1 k. W Air-to-Air Heat exchangers for high heat loads – up to 5 k. W 18
Conclusion n n Heat Pipes are extremely efficient heat transfer devices. Does not require external energy for operation other than the energy it transfers. A typical, optimised, heat pipe system can be manufactured for required heat loads. Heat pipe heatsinks, as compared to extruded heatsinks, can provide unmatched characteristics in Thermal resistance, weight and volume for a comparable cost. 19
Conclusion n By installing across supply and exhaust ducts we can recover energy that would otherwise be lost to atmosphere. Typical efficiencies - 50 to 60 % n By wrapping The Heat Pipe around a cooling coil we can bypass a certain amount of heat so saving on the cooling load and giving the same amount of free reheat. Nett energy savings - around 33 % n Enclosure cooling is possible without any ingress of external contaminants and without any active cooling. 20
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