In the present paper the authors refer about the preliminary analysis, the design and the characteristics of a new experimental test rig which has been proposed for understanding and measuring the connections between mass flow rate and heat input in a conventional two phase loop thermosyphon. The mass flow rate measurement is in particular a critical element a natural circulation loop. The experimental apparatus consists of an evaporator 80 mm long about, a vertical glass tube (riser), a horizontal condenser, a copper downcomer and some chambers which allow portions of the loop to be temporally disconnected and the mass flow rate integrally measured. Measurements of pressures, temperatures and mass flow rate are placed in different part of the loop. The level of the fluid in the test loop can be varied as well as the heat input: the heat flux can be varied in the range between 0 and 1000 W. The operating fluids are water and other refrigerants. In order to study the effect of loop dimensions and quantity of the fluid contained in the loop, the diameter of the rising tube can be varied from 5 mm to 20 mm, the vertical distance between the evaporator and condenser can be varied up to 1500 mm. Particular attention is paid on the mass flow rate measurement, that is obtained with different direct and indirect methods.
An Experimental Device for Thermal and Fluid Dynamic Analysis of Small Dimensions Two-Phase Loops
FILIPPESCHI, SAURO;FRANCO, ALESSANDRO
2011-01-01
Abstract
In the present paper the authors refer about the preliminary analysis, the design and the characteristics of a new experimental test rig which has been proposed for understanding and measuring the connections between mass flow rate and heat input in a conventional two phase loop thermosyphon. The mass flow rate measurement is in particular a critical element a natural circulation loop. The experimental apparatus consists of an evaporator 80 mm long about, a vertical glass tube (riser), a horizontal condenser, a copper downcomer and some chambers which allow portions of the loop to be temporally disconnected and the mass flow rate integrally measured. Measurements of pressures, temperatures and mass flow rate are placed in different part of the loop. The level of the fluid in the test loop can be varied as well as the heat input: the heat flux can be varied in the range between 0 and 1000 W. The operating fluids are water and other refrigerants. In order to study the effect of loop dimensions and quantity of the fluid contained in the loop, the diameter of the rising tube can be varied from 5 mm to 20 mm, the vertical distance between the evaporator and condenser can be varied up to 1500 mm. Particular attention is paid on the mass flow rate measurement, that is obtained with different direct and indirect methods.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
