Top PDF A review of linear compressors for refrigeration

A review of linear compressors for refrigeration

A review of linear compressors for refrigeration

Keywords: linear compressor, household refrigeration, miniature, linear motor, resonance 1. Introduction A linear compressor does not have a crank mechanism to drive the piston and is driven directly by a linear motor, which has a higher electrical efficiency than a traditional rotary induction motor. Oil-free operation is possible, and this is a significant advantage with respect to the heat transfer performance of the condenser and the evaporator in a refrigeration system and it would allow the use of compact heat exchangers. The absence of oil widens both the choice of refrigerants and their operating temperature range. Eliminating the need for the oil return reduces constraints on pipe sizing and will lead to a reduction in pressure drop losses [1]. In a high efficiency linear machine, the piston operates resonantly in order to minimise the drive current and ohmic losses. Resonance is determined by the moving mass and by spring stiffness, which has at least two components, the mechanical springs and the ‘gas spring’ effect of the compression process: in moving magnet motors the reluctance leads to a magnetic spring effect. The potential for this technology to be scaled to small physical sizes is better than for conventional compressors [2]. The refrigeration capacity for system using linear compressors can be modulated by simply changing the excitation voltage.
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REVIEW PAPER ON REFRIGERATION SYSTEM USING MICROCHANNEL CONDENSER

REVIEW PAPER ON REFRIGERATION SYSTEM USING MICROCHANNEL CONDENSER

The literature review in carried out in order to see the present research in this area which is elaborated under the present status. Further review will be carried out for the following purpose by referring journals like International Journal Of Refrigeration, Applied Thermal Engineering, ASHRAE Journal, Renewable and Sustainable Energy Review, Journal of Industrial and Scientific Research etc.

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Experimental and Mathematical Analysis of Thermoelectric Refrigeration System: A Review

Experimental and Mathematical Analysis of Thermoelectric Refrigeration System: A Review

Abstract – The thermoelectric effect is the direct conversion of temperature differences to electric voltage and vice versa. A thermoelectric device creates voltage when there is a different temperature on each side. The term thermoelectric effect includes three separately identified effects: the Seebeck effect, Peltier effect, and Thomson effect. The main objective of the current review study to improve the efficiency and lower the manufacturing cost of thermoelectric refrigeration system. A comparative study through the literature of the various experimental and mathematical model of thermoelectric refrigeration system in which various parameters like thermal performance, thermal characteristics and coefficient of performance are discussed. Studies shows that there is a huge scope of research in this field about thermoelectric refrigeration system and heat sink design.
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Absorber Design and Performance in Vapour Absorption Refrigeration System : A Review

Absorber Design and Performance in Vapour Absorption Refrigeration System : A Review

cycle systems, and its performance directly impacts the overall size, performance, first-cost and energy supplies of these devices. In this paper a review of the main experimental, analytical results and review of different absorber designs reported in absorption refrigeration cycles is presented. It is shown that most of the experimental and analytical work found in the literature has focused on the particularly simplified case of absorption in falling film absorber and bubble mode absorber while there are only few papers on flat plate absorber or slug flow absorber. There are also work on comparison of absorber design for better performance. But there are lesser work available on the effect of heat transfer with increasing circulation rate or absorber temperature.
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VORTEX TUBE REFRIGERATION: A REVIEW

VORTEX TUBE REFRIGERATION: A REVIEW

The technology is making our environment poorly for existence, by emission of hazardous elements that causes depletion of ozone layer and affects the human comfort. A cooling is very important for both man and machine. In general vapor compression refrigeration system and vapor absorption refrigeration system are used for refrigeration purpose. Non- conventional type of cooling system means Vortex tube cooling system which is not used widely for cooling purpose. Vortex tube has many advantages over the conventional cooling system. Separating cold and hot streams by using vortex tube can be used in industrial application such as cooling equipment’s and refrigerants. The objective of the paper is to review the concept of vortex tube that used for refrigeration purpose and in future can be the best replacement over conventional refrigeration systems.
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Waste Heat Recovery Systems for Refrigeration : A Review

Waste Heat Recovery Systems for Refrigeration : A Review

During various industrial processes, as much as 20 to 50% of the energy consumed is ultimately lost via waste heat contained in streams of hot exhaust gases, exhaust steam and hot liquids, as well as through heat transfer from hot equipment surfaces. Captured and reused waste heat is a valuable approach to improve overall energy efficiency by optimizing for costly purchased fuels or electricity and for the protection of global environment from pollution and rate of global warming. The applications of waste heat energy include generating electricity, preheating combustion air, space heating, refrigeration, etc. This review paper studies how refrigeration can be achieved quantitatively as well as qualitatively in different domains by using various waste heat recovery technologies from key industrial waste heat sources. This paper also studies the huge annual energy savings and environmental benefits that can be resulted by using these waste heat recovery technologies for refrigeration.
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“A Review On Solar Adsorption Refrigeration System”

“A Review On Solar Adsorption Refrigeration System”

Abstract - The climate of the India comprises wide range of the weather across a vast geographic scale which can affect the coefficient performance of the solar adsorption refrigeration system. This paper primarily focuses on the performance and analysis of the solar adsorption system for tropical wet and dry climatic zone of India. The objective of this review is to understand the different parameters which may affect the solar adsorption refrigeration system .For that we have to consider certain factors which are relevant to the intensity of solar radiation such as local latitude, angle of inclination of the receiving surface, weather conditions etc. The system proposed consist of a glass tube having sorption bed, condenser and an evaporator. The working pair of fluid used is low grade charcoal and methanol .For the successful operation of this system the factors such as adsorbent-adsorbate pair, system design and arrangement of the subsystems have been chosen with great care.
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A Literature Review on Use of Nanofluids in Refrigeration Systems

A Literature Review on Use of Nanofluids in Refrigeration Systems

Based on the literature review it is studied that nanofluids are to be a very efficient alternative to traditional fluids. Nanorefrigerants are superior fluids containing nano-sized particles. Nanorefrigerants are used to enhance the performance of a refrigeration system. This paper presents a review of the thermophysical properties and performance of the nanorefrigerants based refrigeration system. From the above literature, taking review into consideration I am going to study the performance of refrigeration system i.e., cooling capacity and power consumption by using nanofluids into various refrigerants and its blends.
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Review on Study of Solar Powered Adsorption  Refrigeration System

Review on Study of Solar Powered Adsorption Refrigeration System

The experimental system has as main parameters mechanical simplicity, cost effectiveness and reliability rather than high levels of performance. Factors considered in the design and construction of the solar adsorption refrigeration system includes: solar irradiance, materials for construction, adsorption and desorption temperature, evaporation and condensation temperature. Figure 7 shows the cycle flow diagram for the machine. The machine will have to ensure safety in function and satisfy the accepted design standards. From the point of view of above stated objectives the solar powered Adsorption Refrigeration system with composite adsorbent is to be designed ,fabricated tested and compared with existing vapour compression system.
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Review on Simple Vapour Compression Refrigeration System

Review on Simple Vapour Compression Refrigeration System

Abstract-In present, a vapor compression refrigeration cycle is frequently used. Simple compression refrigeration is similar to reversed Carnot cycle and domestic and industrial refrigerator, air conditioning system, heat pump and water cooler designed base on vapor compression refrigeration cycle. This paper deals about simple vapor compression system, its various components and about the coefficient of performance (COP) of vapor refrigeration system.

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CO2 as a Refrigerant in Supermarket Refrigeration Systems: A Review

CO2 as a Refrigerant in Supermarket Refrigeration Systems: A Review

of new refrigeration system solutions [Lorentzen 1995, Pearson 2005] which require less refrigerant charge and less energy consumption. Nevertheless, the energy consumption of the system should be kept as low as possible and high performance. Right now the most likely replacement is another new class of fluorocarbon refrigerants called hydrofluoroolefins (HFOs) [Llopis et al. 2015, Gullo and Cortella 2016, Kandoliya and Mehta 2016, and Mota-Babiloni et al. 2017]. Their primary advantage is, their lower GWP than other refrigerants and they can be used with existing refrigeration system designs. Nowadays, the CO 2 is going to become an alternative refrigerant in the refrigeration technology as well as its use in the heat
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Review on Comparative Analysis of COP of Vapour Compression Refrigeration System

Review on Comparative Analysis of COP of Vapour Compression Refrigeration System

A vapor compression cycle that is used in most household refrigerators, freezers and cold storages. The performance of a simple vapour compression refrigeration system, used in numerous of small refrigeration applications all over the world. In this cycle a circulating refrigerant enters a compressor as low pressure vapor at or slightly above the temperature of the refrigerator interior. The vapor is compressed and exits the compressor as high-pressure superheated vapor. The refrigerant, while passing through the condenser, gives up its latent heat to the surrounding condensing medium which is normally air or water. The condenser cools the refrigerant vapor, which then liquefies. This liquid refrigerant is forced through a metering or throttling device, also known as an expansion valve (essentially a pin-hole sized constriction in the tubing) to an area of much lower pressure [12].
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REVIEW ON MAGNETIC REFRIGERATION AT ROOM TEMPERATURE USING MAGNETOCALORIC EFFECT

REVIEW ON MAGNETIC REFRIGERATION AT ROOM TEMPERATURE USING MAGNETOCALORIC EFFECT

other microorganism issues, they also found out that the growth of microbes was very slow at low temperatures, and a lot many of them could not survive at low temperature (less than 10°C), hence the requirements of refrigeration became even more imminent and it's applications for preserving eatables came further into use. The first mechanical refrigerators were made for making ice in 1860s. The use of refrigeration in cold storage, meat production, fisheries etc only became commercially viable after the 1900s when electricity generation for meeting power requirements was introduced more widely.
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Effect of different refrigerants on vapor compression refrigeration system-A review

Effect of different refrigerants on vapor compression refrigeration system-A review

A single-fluid Hydrofluorocarbon (HFC) refrigerant, R134a, is commonly preferred for domestic refrigerators. Although the ODP of R134a is having zero value and the GWP is having relatively higher value as compared with other two refrigerants. Because of this reasons there is a need of replacement of such refrigerant in domestic refrigeration system and it has been seen that the production and use of R134a will be terminated soon. Therefore, other replacements will be needed that are thermodynamically efficient as R134a. This study compares the performance of R134a and other two low GWP HFC refrigerants (R32 and R152a) in vapor compression refrigeration system. The performance parameters of the refrigerants were analysed and determined by means of theoretical cycle calculation using experimental data.
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A Review on: Magnetic Refrigeration   Emerging Technology in the Field of Refrigeration

A Review on: Magnetic Refrigeration Emerging Technology in the Field of Refrigeration

conventional gas compression/ expansion technique contributed climate change occurred negative environmental effect due to increasing energy consumption is investigated. Magnetic Refrigeration is a refrigeration type based on magneto caloric effect (MCE). It is possible to make refrigeration under 1K temperatures with the magnetic refrigeration and liquefaction of hydrogen and helium. Recently, there have been two breakthroughs in magnetic- refrigeration researches: one is that the magnetic refrigerators on near room temperature,; the other one is that to discover a new magnetic materials for room temperature applications. The new materials are manganese–iron– phosphorus and arsenic (MnFe(P,As)) alloys. Nowadays rotary and reciprocating type magnetic refrigerators are exist and studies is going on for the developments of this refrigerators.
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A REVIEW ON COMMERCIAL REFRIGERATION

A REVIEW ON COMMERCIAL REFRIGERATION

obtained in the compressor calorimeter tests for DR-7 and L40 (glide around 6K and 7.7K, respectively) are shown in Table 4 [85-88]. A summary of AHRI tests performed until 2014 can be found in the Wang and Amrane review [89]. Refrigerant manufacturers published the conclusions of their own experimentations. Dupont tested DR-7 and DR-33 in a reach-in freezer [90], the DR-7 energy consumption compared to R404A was between 3% and 8% lower for DR-7 and between 0 and 4% lower for DR-33. In display case (condensing unit), DR-33 energy consumption compared to R404A was between 3% and 4% lower at low temperature and between 8% and 12% lower at medium temperature conditions. In the case of Honeywell mixtures [91], N40 energy efficiency is higher than that of L40, being that higher than R404A. N40 cooling capacity is slightly higher than R404A but for L40, this parameter is lower. Due to the GWP limitation of 150 in Europe [13],
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A Review of Vortex Tube Refrigeration System

A Review of Vortex Tube Refrigeration System

A Review explained the working principle of vortex tube. A detailed description of the parts of vortex tube has been highlighted. Literature review is to understand the effect of various parameters like inlet pressure of air, number of nozzles, cold orifice diameter and hot end valve angle on the performance of vortex tube. Also by the literature review it is clear that there is no theory so perfect, which gives the satisfactory explanation of the vortex tube phenomenon. A detailed study has been carried out to understand the reason of the splitting of air stream. The experimental results show that the static temperature in the center of vortex tube is higher than that of the peripheral part.
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A Review on Magnetic Refrigeration at Room Temperature

A Review on Magnetic Refrigeration at Room Temperature

The four basic thermodynamic processes of the Magnetic refrigeration are most simply realized by the machines as described above. Now the magneto caloric effect was applied in two different ways giving rise to two different types of refrigerators, Linear or axial and Rotary refrigerators. Linear or axial refrigerators was described in the patent of the University Of Applied Sciences Of Western Switzerland (Kitanovskiet al., 2004), whereas second recently deposited patent idea describes a machine of a radial or rotary type of refrigerator. A first step is the magnetization of a porous solid magneto caloric structure in a magnetic field, followed by a simultaneous heating up of the material (Refer A in the figure). By a fluid flow this structure is cooled and after that it turns out of the magnetic field and shows demagnetization process (Refer B in figure). Here the magneto caloric alloy becomes cold and is heated by a fluid flow, which preferable has the opposite direction to the first flow. If the hot fluid on side is used its an heat pump application, if the cold fluid is applied then the machine is a cooler or a refrigerator. The axial machine has the advantage of constant axial fluid velocity, while the rotary machine allows the magnet assembly to be placed in the preferable positions.
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A Review on Thermoacoustic Refrigeration System

A Review on Thermoacoustic Refrigeration System

4. Frequency: As the power density in the thermoacoustic devices is a linear function of the acoustic resonance frequency an obvious choice is thus a high resonance frequency. On the other hand is inversely proportional to the square root of the frequency which again implies a stack with very small plate spacing. Making a compromise between these two effects and the fact that the driver resonance has to be matched to the resonator resonance for high efficiency of the driver, A resonance frequency of 400 Hz is used.
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“A review on vortex tube refrigeration and Applications”

“A review on vortex tube refrigeration and Applications”

Using compressed air combined with the vortex tube have shown that using this method of cooling the tool interface is effective and compares exceedingly well with traditional cooling methods. The temperature recoded during air-cooling was found to be 60°C which is 40 °C cooler than that obtained during traditional wet machining and 210 °C cooler than dry machining.vortex refrigeration method is more effective and efficient as large scale temperature drop has been seen as compared to conventional cooling method, hence better cooling rate is observed .In addition to that it also provides large tool life, reduces abrasion and deterioration of cutting tool surface. It also decreases the negative effect of coolant and lubrication which were used in past .This method is also economically feasible and eco-friendly.The introduction of dry machining is one of sollution of today’s metal cutting industry that tirelesslyendeavours to reduce machining costs and impact from chemicals in the environment.vortex tube performance characteristics and the use of vortex tubes to increase the total efficiency of power systems, especially micropowersystems.vortex tube can be use for various applictions[8] as cooling solder,cooling machine plastic,setting hot melts, cooling molded plastic ,cooling of gas samples and it also can be use in ultrasonic weld machine .
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