Steam Jet Refrigeration System

1967 Words Jul 3rd, 2012 8 Pages
A
Seminar Report
On
Working Principal of Steam jet refrigeration system
Submitted by
Amit Prakash
Roll No-1126004

Department of Mechanical Engineering
National Institute of Technology, Patna
Patna-800005, Bihar (India)

Candidate Declaration

This is to certify that seminar report entitled Working principle of Steam jet refrigeration system has been prepared by me under the supervision of Dr. Amarnath Sinha Professor
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Flashing a portion of the water in the tank reduces the liquid temperature. Figure 3.66 presents a schematic arrangement of a steam jet refrigeration system for water cooling. In the system shown, high-pressure steam expands while flowing through the nozzle 1. The expansion causes a drop in pressure and an enormous increase in velocity. Steam flows through the ejector (or sometimes called an eductor or venturi) and creates a low pressure zone in the branch nozzle of the ejector. The low pressure nozzle is connected to a chamber filled with water.As the pressure continues to reduce in the water filled chamber the water begins to boil. This provides the cooling action.
The velocity is gradually reduced in the diffuser but the pressure of the steam at the condenser 4 is increased 5-10 times more than that at the entrance of the diffuser (e.g. from 0.01 bar to 0.07 bar).This pressure value corresponds to the condensing temperature of 40°C. This means that the mixture of high-pressure steam and the flash vapor may be liquefied in the condenser. The latent heat of condensation is transferred to the condenser water, which may be at 25 °C. The condensate 5 is pumped back to the boiler, from which it may again be vaporized at a high pressure. The evaporation of a relatively small amount of water in the flash tank (or flash cooler) reduces the temperature of the main body
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