Heating, ventilation, aircondition, refrigeration testo. Nptel courses from iit kharagpur view engineering video lectures, course materials by top faculty from iit kharagpur. A publication of the lubrication engineers technical department leaders in lubricants number 48 refrigeration systems cold is a relative term which specifically refers to a reduced temperature condition within a confined space. Purpose of air conditioning and definition of terms. Refrigeration and air conditioning is used to cool products or a building environment. Up next mod01 lec27 cryocoolers ideal stirling cycle duration. Stirling cryocooler and gmrefrigerators, this cryocooler can be made without moving parts in the low. Mar 06, 2015 pinnacle career institute online hvac training refrigeration systems the four major components. Describe various air cycle refrigeration systems section 9. Heating, ventilation, aircondition, refrigeration measuring instruments from testo are used by customers all over the world for widely differing applications. The efficiency and refrigeration power are compared with those of other refrigeration cycles.
Thermometers are used to calibrate the controls of refrigeration. A mechanical refrigeration system produces this condition by piping a volatile. A publication of the lubrication engineers technical department. Heat transfer nptel online videos, courses iit video lectures. Similarly, during pressurisation elements of gas entering the tube via the regenerator i. Lecture 17 vapour absorption refrigeration systems contd. If playback doesnt begin shortly, try restarting your device.
Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses. A model of an airconditioning condenser and evaporator with. Arora from iit kharagpur made available by nptel elearning initiative. Learn for free, pay a small fee for exam and get a certificate. The pulse tube refrigerator ptr or pulse tube cryocooler is a developing technology that emerged largely in the early 1980s with a series of other innovations in the broader field of thermoacoustics. Refrigeration and airconditioning nptel online videos. Energyplus can model refrigerated case equipment consisting of a compressor rack, multiple refrigerated cases and walkin coolers, secondary loop equipment, and optional heat reclaim air and water heating coils. The recent developments in this field will be described. Unit 3 refrigeration equipment refrigeration equipment. Refrigeration and air conditioning free online course video tutorial by iit kharagpur.
Nptel online videos, courses iit video lectures well organized. Introduction a computational model was developed for airconditioning condensers and eva porn tur with either inlube enhancement or installed smooth tube. Refrigeration costs advanced refrigeration systems. Download refrigeration and air conditioning by arora, ramesh. In this contribution the thermodynamics and hydrodynamics of pulse tube refrigeration will be explained.
The refrigeration or air conditioning system r transfers heat from a cooler. A schematic of a typical basic refrigeration system is shown below. Fundamentals of mechanical refrigeration systems course content introduction mechanical refrigeration is a thermodynamic process of removing heat from a lower temperature heat source or substance and transferring it to a higher temperature heat sink. A harmonic analysis with phasors is described which gives reasonable results for the refrigeration power yet is simple enough to make clear the processes which give rise to the refrigeration. Download free sample and get upto 48% off on mrprental. The nature of these liquids causes them to rise or fall uniformly in the hollow tube with each degree in temperature change. Digital manifolds provide highprecision temperature and pressure measurements, determine subcooling and superheating, but also enable reliable evacuation of the system through accurate vacuum measurement. Nimai mukhopadhyay and someshwar chowdhury 9 studied theoretical modeling of solarassisted cascade refrigeration low cost solar cooling system. However, our real strength has for years been with hvacr technicians. Refrigeration engineering lecture notes slideshare.
The partial vacuum in the vessel causes some of the. Technical assessment of refrigeration technologies the assessment of refrigeration tech nologies involved the evaluation of two fundamental criteria common to all refrig eration and airconditioning applications. The series pulse tube configuration described earlier in this paper was the first multistage assembly built to improve the base temperature of the pulse tube refrigerator. This can be explained very easily with the help of the ts diagram fig. Refrigeration and air conditioning online course video. Alternative technologies for refrigeration and air. The two most common thermometer scales are the fahrenheit and the celsius. Refrigerant includes co 2 refrigeration parts refrigeration labor year to date 2010. Knowing the temperature difference across the coils, the amperage, and the airflow all give the technician vital information. Nptel, online courses and certification, learn for free. Refrigeration cpsw calculation metric low leak rates and low refrigerant use refrigeration costs include cpsw. Todays modern pulse tube coolers incorporate these improvements. Which is basically a large heat exchanger, by rejecting heat to a cooling.
Nptel provides elearning through online web and video courses various streams. Ieicos computerized refrigeration cycle test rig is. Oil analysis as a diagnostic tool for industrial refrigeration syste picture 1. Steam is passed through a vacuum ejector of high efficiency to exhaust a separate, closed vessel which forms part of a cooling water circuit. Electrical pulse width modulation for power electronic converters playlist. It is important to attach and remove a gauge manifold. In recent years, there has been a rapid development in these cryocoolers, especially in the field of pulse tube cooling. Apr 27, 2016 carnot refrigeration system with dry compression it can be seen from the above expression that the cop of a carnot refrigeration system increases as the evaporator temperature increases and condenser temperature decreases. The danfoss ak2sc255 communicates with the existing eci io via the upgrade kit. Refrigeration is the process of removing heat from an area or a substance and is usually done by an artificial means of lowering the temperature, such as the use of ice or mechanical refrigeration. Heat transfer nptel online videos, courses iit video.
Slide bearing seizure on screw compressor due to lack of oil viscosity. New refrigeration system based on magnetics more economical. Click on any video lecture link to view and download that video. Comfort conditions and air conditioning factors which affect it. Mechanical refrigeration and airconditioning youtube. A model of an airconditioning condenser and evaporator with emphasis on in tube enhanceinenl k. An exotic metal alloy may be the key to a new quieter, more economical class of home and commercial refrigeration systems based on magnetics rather than conventional gas compression and expansion. Iit kharagpur nptel courses video courses and lectures by.
Smart material, adaptive structures and intelligent mechanical systems iitk. Autoplay when autoplay is enabled, a suggested video will automatically play next. Electrical engineering pulse width modulation for power electronic converters. Pal mechanical engineering department iowa state university ames, iowa 1. The advent of digital technology means huge quality improvements when it comes to the adjustment of refrigeration systems or heat pumps. Cylinder and piston mechanism and pv diagram of a reciprocating compressor where d is the bore or diameter and l is the stroke, i. Both power generation and refrigeration are usually accomplished by a system that. Buy refrigeration and air conditioning by arora, ramesh chandra pdf online. Mechanical refrigeration is defined as a mechanical system or apparatus so designed and. Average refrigeration cost is 49% of chain average.
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