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Steam Jet Refrigeration

The document discusses steam-jet refrigeration systems. It explains how steam is used to reduce the pressure and temperature in an evaporator to chill water for cooling applications. It provides examples of using steam jet refrigeration for air conditioning and chemical plants. Sample problems are also included to calculate refrigeration capacities, quantities of vapor and water, and other values.

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elaizaagudo17
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218 views2 pages

Steam Jet Refrigeration

The document discusses steam-jet refrigeration systems. It explains how steam is used to reduce the pressure and temperature in an evaporator to chill water for cooling applications. It provides examples of using steam jet refrigeration for air conditioning and chemical plants. Sample problems are also included to calculate refrigeration capacities, quantities of vapor and water, and other values.

Uploaded by

elaizaagudo17
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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A steam-jet pump maintains a temperature of 5°C in the

STEAM-JET evaporator. The cooled water leaves at the same


REFRIGERATION temperature and warms to 10°C as it does its
refrigeration. Make-up water is available at 21°C. There
are required 1.27 kg of nozzle steam per kg of vapor
removed from the evaporator. For a 175-kW plant,
compute the volume of vapor handled, quantity of steam

STEAM JET REFRIGERATION is a type of water


evaporative refrigeration wherein water is used as the
refrigerant. The principal operation is based on the fact
that water will boil or vaporize rapidly, at a relatively needed, and the quantity of chilled water.
low temperature, if the pressure on the surface is
reduced sufficiently.

 EJECTOR
- sucks of draws water from the surface of the water in
the evaporator of flash chamber, causing the pressure in
the evaporator to drop.
- reduces pressure in the evaporator to a point at which
the water will vaporize at the desired temperature.
- in vaporizing, it absorbs heat and cools the remainder
of the water in the evaporator. SAMPLE PROBLEM 2
- steam pressure at the ejector nozzle should be about A vacuum refrigeration system consists of a large
1030 kPa. insulated flash chamber kept at low pressure by a steam
ejector which pums vapor to a condenser. Condensate is
The evaporation of the water in the evaporator, reduces removed by a condensate to an air vent. Warm return
the temperature of the water in the evaporator. This cold. water enters the flash chamber at 13°C: chilled water
4°C to 21°C, is circulated by means of pumps, to the comes out the flash chamber has a quality of 0.97 and
area to be cooled. the temperature in the condenser is 32°C. For 350-kW of
refrigeration.
Steam jet systems are used extensively in air A) How much chilled water at 5°C does this system
conditioning, and for cooling of water in certain provide?
chemical plants for gas absorption. The cooling B) How much make-up water is needed?
temperatures provided by the steam-jet mechanism are C) How much vapor must the steam ejector remove
usually 4°C and 21°C. Temperature below 4°C are from the flash chamber?
impractical due to danger of freezing.
ADDITIONAL PROBLEMS
1) There are 3.06 m3/s of vapor from the water
evaporator of a vacuum refrigeration system; the warm
water enters the evaporator at 18°C and chilled water
leaves at 10°C; make-up water enters at 29°C.
Determine the refrigerating capacity.

2) In a steam jet refrigeration system, the evaporator is


maintained at 6°C. The chilled water leaves at the same
temperature and warms to 11°C as it absorbs the load.
Make-up water in available at 25°C. For a capacity of 50
tons, determine:
A) The quantity of chilled water required
B) Volume of vapor removed
SAMPLE PROBLEM 1

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