Refrigeration Basics Manual
Basic Refrigeration Cycle Principles of Refrigeration • Liquids absorb heat when changed from liquid to gas • Gases give off heat when changed from gas to liquid. For an air conditioning system to operate with economy, the refrigerant must be used repeatedly.
For this reason, all air conditioners use the same cycle of compression, condensation, expansion, and evaporation in a closed circuit. The same refrigerant is used to move the heat from one area, to cool this area, and to expel this heat in another area. • The refrigerant comes into the compressor as a low-pressure gas, it is compressed and then moves out of the compressor as a high-pressure gas.
The Danfoss product range for the refrigeration and air conditioning industry Danfoss Refrigeration & Air Conditioning is a worldwide manufacturer with a leading position in industrial, commercial and. - an introduction to the basics REFRIGERATION & Lecture. Different types respond to temperature, pressure, humidity, liquid levels, other controls, manual intervention and other things. Refrigeration Basics III Preview. Ammonia Refrigeration Basics is available in online maintenance training and course manual formats. TPC Training Systems is authorized by IACET to offer 0.5 CEUs for this program. Review a full course list for Refrigeration Technician. The information in this manual is meant for entry-level personnel to the commercial refrigeration industry to improve their understanding of the fundamentals of basic refrigeration principles.
• The gas then flows to the condenser. Here the gas condenses to a liquid, and gives off its heat to the outside air. • The liquid then moves to the expansion valve under high pressure. This valve restricts the flow of the fluid, and lowers its pressure as it leaves the expansion valve. • The low-pressure liquid then moves to the evaporator, where heat from the inside air is absorbed and changes it from a liquid to a gas. • As a hot low-pressure gas, the refrigerant moves to the compressor where the entire cycle is repeated.
Note that the four-part cycle is divided at the center into a high side and a low side This refers to the pressures of the refrigerant in each side of the system.
Lesson 1 - Ammonia Characteristics Topics: Ammonia sources, uses, and chemical characteristics; Environmental, hazardous material concerns; Temperature-pressure relationships; Materials compatibility; MSDS criteria; Safety Learning Objectives: – Name common uses of ammonia and describe benefits of ammonia refrigerant in terms of ozone depletion and global warming potentials (ODP and GWP). – Describe the properties of ammonia and explain how they affect the use of ammonia as a refrigerant. – Discuss the toxicity and flammability of ammonia and its classification as a hazardous material. 77c Drill And 107c Drill Haybuster Manual. – Discuss important features of ammonia saturation curves, reactions with metals, and MSDS criteria. – Name two standards governing ammonia refrigeration systems and describe the four main ammonia safety concerns, steps for their prevention, and first aid treatment in the event of exposure. Lesson 2 - Single-Stage Ammonia Systems Topics: Positive-displacement systems; Refrigeration loads; Primary, secondary refrigeration system components; Components in parallel; Superheat; Single-stage pressure-enthalpy diagram Learning Objectives: – Briefly compare absorption and mechanical compression systems, compare dynamic and positive-displacement compressors, and name those generally used in industrial ammonia refrigeration systems. – Explain how a positive-displacement compressor increases the ammonia vapor pressure.
– Define British thermal unit (Btu), specific heat, sensible heat, latent heat, and tons of refrigeration. Welding Rotator Manual. – Name four primary components in single-stage ammonia refrigeration systems and describe their functions. – Describe the functions of the oil separator, high-pressure liquid receiver, king valve, and suction accumulator in single-stage ammonia refrigeration systems. – Define superheat, enthalpy, and entropy and explain how they are used on the pressure-enthalpy (P-H) diagram.