Ideally suited to those with a little or no knowledge of the subject. Orc decreases the annual operating cost for the total site by reducing the electricity demand from the site. Both a steadystate and a transient simulation will be considered. The presentation will give you idea about the vapor compression refrigeration system. Refrigeration system nptel refrigerator refrigeration. Vapor compression refrigeration cycle objective determining the coefficient of performance of a vapour compression refrigeration cycle. Vapour compression refrigeration is the primary method to provide mechanical cooling. Vapor compression refrigeration cycle versus absorption. Figure 2 shows the key state points for a vapor compression cycle utilizing an idealized liquidsuction heat exchanger on a pressure enthalpy diagram. For a closed cycle of refrigeration employing the condensable refrigerant vapour, the following processes are required.
Two stage compression system with flash intercooler youtube. Ravi kumar department of mechanical and industrial engineering indian initiation of technology, rookee hello i welcome you all in this course on refrigeration and airconditioning. The working fluid is a refrigerant that suits the high and low temperature reservoirs temperatures. Mechanism and working of a vapour compression refrigeration system with pv and ts diagram mecholic no comments. New opportunities for solar adsorption refrigeration. It is also used in domestic and commercial refrigerators, largescale warehouses for chilled or frozen storage of foods and meats. Vapourcompression refrigeration or vaporcompression refrigeration system vcrs, in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for airconditioning of buildings and automobiles. This case study demonstrates the modeling of a vapour compression refrigeration system using r22 as refrigerant. Nptel nptel online certification course refrigeration and airconditioning lecture08 vapour compression cycle2 with prof. Mechanical engineering refrigeration and air conditioning nptel. Both power generation and refrigeration are usually accomplished by a system that. These are the evaporator, condenser, compressor and the expansion valve. So this is about is one way of the vapour compression refrigeration system and as we shall see later we use a compressor here for producing the required fraction. System description a one stage vapor compression refrigeration system is considered as numerical exemplification of the proposed study.
In this type of refrigerator, refrigerant undergoes phase changes. A vapour compression refrigeration system is an improved type of air refrigeration system in which a suitable working substance, termed as refrigerant, is used. Lecture 03 air refrigeration cycle lecture 04 aircraft refrigeration. Apparatus figure 1 shows the experimental setup in details. Two stage compression system with flash intercooler professor kartik. Analytical method for solving vapour compression example duration.
In the vapour absorption system, an absorber, a pump, a generator and a pressurereducing valve replace the compressor. Multistage vapour compression refrigeration example1 two stage compression system with water intercooler uses r4a as shown in figure1. Which is basically a large heat exchanger, by rejecting heat to a cooling. Interactive computer routines have been composed, in basic language, in order to permit the prediction of the performances of simple, multievaporator multistage compressor vapourcompression refrigerators when employing refrigerant r11, r12, r22 or r502. A minimum of two adsorbers are required to obtain a continuous cooling effect. Multistage vapour compression refrigeration systems nptel. System description the layout of the system is shown in figure 1. Multistage system of cooling is widely used there, where ultralow temperatures are required, but can not be produced economically through the use of a singlestage system.
Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The other components of the system are condenser, receiver, expansion value and evaporator as in the vapour compression system. The simple vapour absorption system, as shown in fig. It condenses and evaporates at temperatures and pressures close to the atmospheric conditions. This is because the compression ratio is too high to reach the temperatures necessary for evaporates and condenses the steam. The above figure shows simple vapour compression refrigeration system. The refrigeration capacity is 8 tr and the compression is. The basic adsorption refrigeration cycle is an intermittent system and the cooling output is not continuous. Layout of the r22 vapourcompression refrigeration system. Sorption refrigeration adsorption systems description of technology sorption refrigeration technologies such as absorption andor adsorption are thermally driven systems, in which the conventional mechanical compressor of the common vapour compression cycle is replaced by a thermal compressor and a sorbent. Design and simulation of a vapor compression refrigeration cycle for a micro refrigerator submitted by seyfettin yildiz in partial fulfillment of the requirements for the degree of master of science in mechanical engineering department, middle east technical university by, prof. The vaporcompression refrigeration cycle can also be used to liquefy gases after some modifications. There are innumerable applications of such systems and they are. Multistage vapour compression refrigeration systems departmen of mechanical engineerin lecture17 multistage vapour compression refrigeration systems 1.
Design of two stage vapour compression refrigeration. Welcome back in the last lecture, i introduced multi stage vapour. Lecture 10 vapour compression refrigeration systems. Refrigerant 22 is a hydro chlorofluorocarbon hcfcs group refrigerant, having ozone depletion potential of 0. The vapor compression refrigeration cycle is nearly 200 years old, but it does not seem ready to leave the scene any time soon. Lecture 10 vapour compression refrigeration systems nptelhrd. Design of two stage vapour compression refrigeration system with water intercooler 1pravin d. The course consists of different refrigeration cycles and understanding of psychrometry and psychrometric processes used for. It is used for all industrial purposes from a small domestic refrigerator to a big air conditioning plant. The standard vapour compression refrigeration system section 10. Page 5 of practical vapour compression refrigeration cycle in practice the reverse carnot cycle is adjusted to the vapour compression refrigeration cycle shown below in figure 3. Simple vapour compression refrigeration system with. Describe various air cycle refrigeration systems section 9.
Strong solution of ammonia is formed in the absorber, dissolving fairly dry ammonia vapour in cold water. Let us see the comparison of the vapor absorption cycle and vapor compression cycle. Vapourcompression units are the most widely used refrigeration systems. Lecture 10 vapour compression refrigeration systems duration. The vapor compression refrigeration cycle, step by step. Key components in the refrigeration system are a compressor, a condenser, an evaporator and an expansion valve. Vtunptelnmeict project progress report the project on. Understand the concept of vapour compression refrigeration system and other cooling. All vapor compression systems consist of the following four basic components alongwith the interconnecting piping. However the major savings comes from reduction in the electricity demand for an existing. This course provides a simple understanding of refrigeration and airconditioning fundamentals. Vapourcompression refrigeration system the primary objective of the simulation is to determine the steadystate performance of the system given the design of all the components together with appropriate boundary conditions.
Magnetic refrigeration is an emerging, environmentfriendly technology based on a magnetic solid that acts as a refrigerant by magnetocaloric effect. Typical vapor compression systems can be represented as shown in figure. Vapour compression refrigeration cycle video lectures. If you continue browsing the site, you agree to the use of cookies on this website. To study the analysis of simple vapour compression cycle and explain the types of vapour compression cycle with ts and ph diagram. The vapour compression cycle which is used in vapour compression refrigeration system is nowadays used for all purpose refrigeration.
To study various controls used in refrigeration and airconditioning system. Lecture vapour compression refrigeration systemscontd. In this article we will discuss about simple vapour compression refrigeration system. The refrigerants, usually, used for this purpose are. Another way of improving the performance of a vaporcompression refrigeration system is by using multistage compression with regenerative cooling. Lecture 12 vapour compression refrigeration systemscontd. The evaporating temperature is 25 oc and condensing temperature 47 oc. Multistage vapour compression refrigeration system eco. Refrigeration and airconditioning nptel online videos. Vapour compression refrigeration cycle the vapor compression refrigeration cycle is nearly 200 years old, but it does not seem ready to leave the scene any time soon. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses. The vapour absorption system uses heat energy, instead of mechanical energy as in vapour compression systems, in order to change the conditions of the refrigerant required for the operation of the refrigeration cycle. Absorption refrigeration only reduces the demand of cold utility.
In this paper, attention is directed towards the nearroomtemperature range. International journal of students research in technology. Joshi 1 department of mechanical engineering, walchand college of engineering, sangli 416415, maharashtra, india abstract refrigeration is the process of reducing and maintaining the temperature of a space or material below the. Typical vapor compression systems can be represented as shown in figure 5. Everything you need to know about refrigeration two types of absorption air conditioners are as follows double stage vapour absorption refrigeration machine short notes on vapour compression refrigeration cycle here is your free essay. Refrigeration system performance using liquidsuction heat. Absorption refrigeration an overview sciencedirect topics. The liquidsuction heat exchanger effects the performance of a refrigeration system by influencing both the high and low pressure sides of a system. The reference cycle for magnetic refrigeration is amr active magnetic regenerative refrigeration. Introduction a single stage vapour compression refrigeration system has one low side pressure evaporator pressure and one high side pressure condenser pressure. First let us see the advantages of absorption refrigeration system and then we shall see the disadvantages of absorption refrigeration. Vapourcompression refrigeration systems sciencedirect.
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