Performance Analysis of loop Thermosyphon System

Mechanical Engineering

Thermosyphon is a method of passive heat exchange, which circulates a fluid without the necessity of a mechanical pump. In modern era, number of the instruments generates more amount of heat such as computer devices, electronic equipment. Close loop two phase thermosyphon system working under gravity with condenser on the top and evaporator at the bottom. It does not require any pump to flow of working fluid from evaporator to condenser. This type of device is known as Close loop two phase thermosyphon. Thermo syphoning is used for circulation of liquids and volatile gases in heating and cooling applications such as heat pumps, water heaters, boilers and furnaces. For the proper working of CLTPT, it is necessary to design system. Optimally filled thermosyphon is recommended with small amount of working fluid to prevent breakdown of liquid film. Working fluid used as Methanol has high merit number. This system consists of an evaporator, condenser, capillary tube, non-return valve, pressure gauge. An evaporator is the heat exchanger device in which liquid absorbs its latent heat of vaporization from heating source and gets vaporized and discharged through the condenser through the vertical riser tubes. Condenser is used to condense fluid from vapor state to liquid state. After rejecting heat, liquid fluid flows under gravity to evaporator inlet. This cycle continued till maintains the required temperature in system. The readings were taken for every one hour time interval, the variation of temperature within the range of ±10C for the 40% and 50% filling ratio. Therefore, working experimental setup is giving satisfactory performance for repeatability test. Forced convection is effective than natural convection for 40% and 50% filling ratio. For various filling condition, Optimum filling ratio in case of natural convection and forced convection is 40%.

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