Steam jet refrigeration system

                                           Steam jet refrigeration system

This system uses the principle of boiling the water below 100 C. If the pressure on the surface of the water is reduced below atmospheric pressure, water can be made boil at low temperatures. Water boils at 6 WIG the pressure on the surface is 5 cm of Hg and at 10 when the pressure is 6.5 cms of Hg. The very low pressure or high vacuum on the surface of the water can be maintained by throttling the steam through jets or nozzles. The general arrangement of the system is shown in the Fig.6.8  Consider a flash chamber contains 100 kg of water. If suddenly I kg of water is removed by boiling, as pressure is reduced due to throttling of steam through nozzles. Approximately 2385 kJ of heat will be removed from the water, which is equivalent to heat of evaporation of water. The fall in temperature of the remaining water will be

Evaporating one more kg of water reduces the remaining water temperature by 5.7 C
further. Thus by continuing this process, the remaining water can be made to freeze. Water is the
refrigerant used in the steam jet refrigeration system. As water freezes at
O C, then either refrigeration has to be stopped or some device is required to pump the
ice.

★ABOUT THE BOOK:
The respected text delivers a comprehensive introduction to the principles and practice of refrigeration. Clear and straightforward, it is designed for students (NVQ/vocational level) and professional HVAC engineers, including those on short or CPD courses. Inexperienced readers are provided with a comprehensive introduction to the fundamentals of the technology. With its concise style yet broad sweep the book covers most of the applications professionals will encounter, enabling them to understand, specify, commission, use and maintain these systems. Many readers will appreciate the clarity with which the book covers the subject without swamping them with detailed technical or product specific information. New material in this edition includes the latest developments in refrigerants and lubricants, together with updated information on compressors, heat exchanges, liquid chillers, electronic expansion valves, controls and cold storage.

★ABOUT THE BOOK:

“A Textbook of Refrigeration and Air Conditioning” is an aptly written textbooks for the students of Mechanical Engineering while also a must-read for anyone with an interest in the subject.
For 30 years, topics such as Air Refrigeration Cycles and Systems, Vapour Compression Refrigeration Systems (Simple and Compound), Refrigerants (incl. Compressors), Psychrometry and Applications of Refrigeration and Air Conditioning have been included and updated for students to conceptualise the subject in a complete manner. The chapters consist of various exercises, examples, and multiple illustrations that aid in understanding the subject better.

Key Features:

• Every concept has been treated individually and then linked within the chapter to provide not only information but also insight.
• Close to 800 examples, figures, tables and pictorial depictions aid to the concepts explained.
• More than 500 chapter-end (objective and subjective) and exercise questions add to the practice of the students.

Table of Content :

• Introduction
• Air Refrigeration Cycles
• Air Refrigeration Systems
• Simple Vapour Compression Refrigeration Systems
• Compound Vapour Compression Refrigeration Systems
• Multiple Evaporator and Compressor Systems
• Vapour Absorption Refrigeration Systems
• Refrigerants
• Refrigerant Compressors
• Condensers
• Evaporators
• Expansion Devices
• Food Preservation
• Low Temperature Refrigeration (Cryogenics)
• Steam Jet Refrigeration System
• Psychrometry
• Comfort Conditions
• Air Conditioning Systems
• Cooling Load Estimation
• Ducts
• Fans
• Applications of Refrigeration and Air Conditioning

★ABOUT THE BOOK:

Review of Thermodynamics heat transfer reversed carnot cycle gas cycle Refrigeration simple vapour compression Refrigeration system properties of common refrigerants Compound vapour compression system multiple evaporator ; compressor system refrigerants compressors condenser expansion devices evaporator matching components in vapour compression system installation vapour compression Refrigeration system multiple
Unit installation Absorption Refrigeration steam jet Refrigeration cascade Refrigeration systems ; low temperature Refrigeration thermal insulation Psychrometry building survey ; heat load estimate applied Psychrometry (advanced) human comfort evaporative air Conditioning moisture transfer pressure losses and duct sizing ventilation systems air-conditioning systems ; applications all air-systems
fans food preservation indoor air quality refrigerant tables ; charts.