Vapcyc center for environmental energy engineering umd, ceee. Vapor compression cooling for high performance applications. System description the layout of the system is shown in figure 1. Recent developments in simulation techniques for vapour. Basic fourcomponent cycle with and without suction line. Jan 08, 2016 vapor compression refrigeration system is the modern principle of refrigeration which relies on motor driven compressor. 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. A heat pump uses a vapour compression cycle with refrigerant 12.
Vaporcompression refrigeration cycle interactive simulation. Vapor compression refrigeration or vapor compression refrigeration system vcrs, in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely. The operating conditions of the refrigeration plant play very important role on the performance of the refrigeration system. For a closed cycle of refrigeration employing the condensable refrigerant vapour, the following processes are required. In the past, refrigeration equipment designers have based their work mainly on their.
The cycle depicted in figure 1 offers several advantages for electronic cooling applications. The compressor is driven by a heat engine with a thermal efficiency of 40%. It consists of 4 essential parts namely compressor, condenser, expansion. The condensers job is to cool the refrigerant so that it turns from a gas into a liquid, or condenses. This is my first time to study refrigeration cycle so that ive not got much experience. Ding and zhang, 2001 for a basic cycle that uses capillary tube as the. The refrigerant is let into and measured by a flow control device, and eventually released to the compressor. Simulation of a simple vapourcompression refrigeration system.
The cycle works between temperatures and representing the condenser and evaporator temperatures, respectively. It is an excellent tool to analyze the causes underlying anomalous performance. Boukhanouf, for simple systemlevel performance analysis. Both a steadystate and a transient simulation will be considered. What is the working principle of vapour absorption. In particular, it is possible to find in a relatively crude manner the solar panel area required for a certain refrigeration effect given the relevant system temperatures. It is also used in domestic and commercial refrigerators, largescale warehouses for.
This is the part of the refrigeration system that is doing the actual cooling. Oct 27, 2009 the refrigerant is not allowed to leave the system but is circulated again and again, alternately condensing and evaporating. Vapor compression refrigeration cycle ts diagram below is a possible cyclepad design of a refrigeration cycle. Refrigeration is a accomplished by various methods, such as the vapour compression system, absorption system, steam jet refrigeration cycle. Vapor compression refrigeration system basic, working. An ideal simulation tool should be numerically efficient. Feb 10, 2017 the presentation will give you idea about the vapor compression refrigeration system. Vapcyc is an advanced vapor compression cycle simulation and optimization tool. It consists of the necessary parts which are described below. However, the compression is never isentropic and hence in actual compression process 45 the. Steady state modeling of advanced vapor compression systems.
Engineering thermodynamics and heat transfer experiment 2. This blog post will explain how this vapor compression refrigeration cycle works and how it can be applied, or you can watch the video explanation, here. Effect of condenser fouling on performance of vapor. Other systems employed are gas refrigeration, vapor absorption refrigeration, and vortex refrigeration. It can be used whenever a refrigeration or airconditioning requirement occurs. The vapour compression cycle which is used in vapour compression refrigeration system is nowadays used for all purpose refrigeration. Vaporcompression 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. Among these the vapour compression refrigeration systems are predominant.
The refrigeration system is an enclosed gas tight system of tubes and equipments as shown below. The heat pump cycle uses an ideal cycle with an evaporator at 5oc and a condenser. An ebook reader can be a software application for use on a computer such as microsofts free reader application, or a booksized computer this is used solely as a reading device such as nuvomedias rocket ebook. These all four components run a simple vapour compression refrigeration system.
Vapor compression refrigeration transports large quantities of heat with a small mass of circulating fluid. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. In some actual refrigeration system, an accumulator, a receiver and a filter may be included. It is used for all industrial purposes from a small domestic refrigerator to a big air conditioning plant. Gas refrigeration cycle a schematic diagram b ts diagram.
Vaporcompression refrigeration, 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. Refrigeration cycles the vapor compression refrigeration cycle is a common method for transferring heat from a low temperature to a high temperature. In simple vapour compression refrigeration system pressure ration up to specific limit can be achieved. Simple vapour compression refrigeration system consists of mainly four parts compressor, condenser, expansion valve and evaporator. In todays refrigeration and airconditioning industries, numerical simulation has been. Design of two stage vapour compression refrigeration system. In this paper, performance of the fabricated system is. For purposes of illustration, we will assume that a refrigeration system used to cool air for an office environment. Simple vapour compression refrigeration system with. Modeling, simulation and optimization of a vapor compression. The physics of vapor compression refrigeration require the system to use enough pressure to compress the gas into a liquid. Vapor compression refrigeration cycle objective determining the coefficient of performance of a vapour compression refrigeration cycle.
The refrigeration system were also used for providing cooling and humidification for summer comfort air conditioning 3. A refrigeration cycle explained involves the cooling system process of refrigerators and air conditioners. A block diagram of a vapour compression refrigeration system is shown in fig. This happens when warm outdoor air is blown across the condenser coil that is filled with hot, gaseous refrigerant. How vaporcompression cooling works electronics cooling. Refrigeration requires continuous generation of pressurized refrigerant, which on condensing and expansion give. Vapor compression system simulation can fall into one of two categories. Vapor compression refrigeration system basic, working, parts of system, advantages, and disadvantages introduction. Vapor compression refrigeration system animation hd youtube. In this article we will discuss about simple vapour compression refrigeration system. The compression process increases the temperature of refrigerant from lower limit t2. The basic refrigeration cycle explained below involves the following components and respective functions. In this experiment, dichlorofluoroethane r141b was used as the refrigerant and the mass.
Flownex was used to simulate a vapour compression refrigeration system using r22 as refrigerant. The objective of this paper is to study the effect of evaporator load on performance of vapour compression refrigeration system with hydrocarbon refrigerants at different loads in evaporator. Vapor compression systems can reject heat far from the source by separating the evaporator and condenser in a socalled split system. The above figure shows the objectives of refrigerators and heat pumps. Vapor compression refrigeration system is the modern principle of refrigeration which relies on motor driven compressor. Mechanism of simple vapour compression refrigeration system. Vapor compression refrigeration cycle engineering essay. Design of two stage vapour compression refrigeration. Refrigeration is a accomplished by various methods, such as the vapour compression system, absorption system, steam jet refrigeration cycle the vapour compression system of refrigeration cycle. Also explain ts and ph diagram with calculate refrigeration effect in system. Thermoelectric refrigeration mechanical project abstract. In the vapor compression refrigeration system, which is widely used, the external agent is a compressor.
Heat balance and energy balance of each component of the system will make the perfect energy assessment of the whole system. Refrigeration cycle animation vapor compression cycle explained. Figure 2 shows a simple vapour compression refrigeration cycle on diagram for different compression processes. The important factors, which are affecting the performance of vapour compression refrigeration system, are listed below. The refrigeration lab was conducted to gain a better understanding of the vaporcompression refrigeration cycle and to compare the ideal cycle with a real cycle. The vapour at low pressure and low temperature point 2 enters to compressor where it is compressed reversible adiabatically isentropically. The vapor compression refrigeration cycle is nearly 200 years old, but it does not seem ready to leave the scene any time soon. Because its function is to absorb heat into the refrigeration system from where you dont want it, the evaporator is placed in the area to be cooled. Refrigeration cycle animation vapor compression cycle.
The purpose of a refrigerator is the removal of heat, called the cooling load, from a lowtemperature medium. Dedicated subcooling is to use a separate refrigeration system with the main system. Refrigeration system the conventional vapour compression refrigeration system consists of four major components namely compressor, condenser, expansion device and evaporator. Ts diagram for a vapour compression refrigeration cycle when the refrigerant leaves the evaporator as a saturated vapour b superheated vapour. Vapor compression refrigeration cycle hindi lecture. Simple vapour compression system mechanical engineering.
May 21, 2019 it works on the principal that compressing a liquid which is basically incompressible is much more economical than compressing a gas. Vapor compression refrigeration cycle matlab simulink. Layout of the r22 vapourcompression refrigeration system. For an air conditioning system to operate with economy, the refrigerant must be used repeatedly. In the vapour absorption system, an absorber, a pump, a generator and a pressurereducing valve replace the compressor. Currently it can simulate performance of the system with r4a refrigerant but can be modified to use other refrigerants. Key components in the refrigeration system are a compressor, a condenser, an evaporator and an expansion valve. May 08, 2017 in this video, i have explained about simple vapour compression refrigeration system. For simulation i will suggest you to opt trnsys tool. Apr 27, 2018 vapour compression cycle consists of phase change from gas to liquid in condenser and the compressor pumps liquid phased refrigerant. Since jacob perkins ice machine built in 1834, vapor compression refrigeration cycle vcrc has been in service of human beings.
The system is designed and tested for various operating conditions using hot water as heat source. The process of refrigeration can be easily described in ph diagram. The function of compressor is to suck the refrigerant gas from low pressure side and to compress it to discharge pressure so that condensation of gas can be done either by water or air at ordinary room temperature. There are no appreciable pressure drops as the refrigerant flows through the condenser and evaporator. This amounts to 40% of the energy supplied in the fuel. The ts diagram for a vapor compression refrigeration cycle is shown below. What is the best software package to model and simulate the. What are the differences between the vapour compression. How can i design a vapor compression refrigeration cycle. Single and multiobjective genetic algorithms are builtinto the program.
The pressurized solution gets heated up sensibly as it flows through the solution heat exchanger by extracting heat from hot solution coming from generator state 4. The substance which works in a heat pump to extract from a cold body and to deliver it to a hot body is called refrigerant. It is also used in domestic and commercial refrigerators, largescale warehouses for chilled or frozen storage of foods and meats. Compression refrigeration cycles take advantage of the fact that highly compressed fluids at a certain temperature tend to get colder when they are allowed to expand. On the air side, three control volumes are defined as follows. The simplest gas refrigeration cycle is the reversed brayton cycle. The vapor compression cycle explained is the most common type of system used in. Making it more efficient as compression work per unit of mass flow is low. Vapour compression refrigeration or vapor compression 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. 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.
Ammonia refrigeration fundamentals graphic products. For this reason, all air conditioners use the same cycle of. Any water in the system would freeze and obstruct piping, so ammonia refrigeration systems must use anhydrous ammonia without water or other impurities. Apparatus figure 1 shows the experimental setup in details. Automatic controls for industrial refrigeration systems. Describes how to use an interactive simulation that demonstrates a refrigeration cycle on a temperatureentropy diagram and a. 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. Jul 21, 2017 the first working vapor compression refrigeration system was built in 1834 by another american who was living in the uk, jacob jenkins. Apr 23, 2020 in any refrigeration process, heat is transferred from one region to another with the aid of an external agent. Vapor compression refrigeration simulation and tutorial asee peer. While some people have viewed this method as environmentally harmful and inefficient, the cycle is still applicable in the industrial sphere. The vapor compression refrigeration cycle, step by step. Liquidsuction subcooler is using a heat exchanger, the heat exchange of the liquid line output condenser to suction compressor inlet. Mathematical model of a vapour absorption refrigeration unit system designers in the design of the most fundamental components.
In this way all these processes go on continuously and as long as the compressor runs, the system produces cooling around the evaporator. In this video explain how to solve numerical problem of simple vapour compression cycle. The vapor compression cycle explained is the most common type of system used in refrigeration and air conditioning. Vapor compression refrigeration or vapor compression refrigeration system vcrs, in which the refrigerant. Sep 10, 2016 after compression, the refrigerant moves to the next component in the refrigeration cycle.
The compressor is referred as the heart of the vapour compression refrigeration system. This app simulates performance of vapor compression cycle. Simple vapour compression refrigeration system, refrigeration. This case study demonstrates the modeling of a vapour compression refrigeration system using r22 as refrigerant. For modelling refrigerationac unit and components performance energy. If you continue browsing the site, you agree to the use of cookies on this website. For a decade, due to the tendency of miniaturization in technology, an effort to produce this. The basic vapor compression cycle has already reached its limits. It uses lumped capacitance models of heat exchangers and correlation based model for the compressor. The first subsystem is the refrigerant cycle system, including at least a compressor, a condenser, a throttling device and an evaporator. The refrigerant as a mixture of liquid and vapour corresponding to state point 1 enters the compressor where isentropic compression takes place.
853 1060 1301 1447 394 641 1039 269 282 597 681 1167 1400 1469 612 1476 926 1373 1453 1057 104 494 1207 377 578 129 202 194 1228 514 895 815 285 382 1174 1416