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Industrial Systems
Published in Scott Dunning, Larry S. Katz, Energy Calculations & Problem Solving Sourcebook, 2020
Reciprocating Compressor (or piston compressor) — Positive-displacement compressor increases pressure of the gas by reducing volume— Uses a piston within a cylinder as the compressing and displacing element— Single-stage and two-stage (higher pressures) reciprocating compressors are available— Typically 1 to 50 HP
Refrigeration
Published in Irving Granet, Jorge Luis Alvarado, Maurice Bluestein, Thermodynamics and Heat Power, 2020
Irving Granet, Jorge Luis Alvarado, Maurice Bluestein
The heart of any refrigeration system is the compressor. While the types of compressors used are similar to those used for air or other gases, the positive-displacement reciprocating compressor is the unit most widely used in industrial vapor-compression refrigeration installations. Centrifugal and gear-type positive-displacement compressors are also used. The gear-type compressor shows good volumetric efficiencies, but the centrifugal compressors are usually inefficient in smaller sizes and are used when the size of a reciprocating unit would be excessively large. A discussion of compressors and an analysis of the reciprocating compressor are given in Section 10.5.
Case Studies of Parametric Accelerated Life Testing
Published in Seong-woo Woo, Design of Mechanical Systems Based on Statistics, 2021
A reciprocating compressor is a positive-displacement machine that uses a piston to compress a gas and deliver it at high pressure through a slider-crank mechanism. A refrigerator system, which operates using the basic principles of thermodynamics, consists of a compressor, a condenser, a capillary tube, and an evaporator. The vapor compression refrigeration cycle receives work from the compressor and transfers heat from the evaporator to the condenser. The main function of the refrigerator is to provide cold air from the evaporator to the freezer and refrigerator compartments. Consequently, it keeps the stored food fresh.
Performance improvement in opposed Piston Linear Compressor for household refrigerator by reducing clearance volume
Published in International Journal of Ambient Energy, 2022
Suneeta Phadkule, Virendra Bhojwani, Sohel Inamdar
In the refrigeration and air-conditioning system, a slider crank mechanism of reciprocating compressor, which is used to convert rotary motion into reciprocating motion, increases friction and wear and also creates noise. To overcome the drawback of friction and wear, an Opposed Piston Linear Compressors (OPLCs), which is a positive displacement compressor, is used. An OPLC can be the best alternative to the reciprocating compressors used in household refrigerators, as the use of this linear compressor will reduce the consumption of electricity. So the objective of this research is to design and develop oil-free OPLC by using flexure springs and test its performance for the household refrigerator. This arrangement has two opposed pistons, directly linked to highly efficient linear motors, supported by flexural springs. This offers a noiseless and oil-less operation of the compressor with minimal friction losses, as shown in Figure 1.
Performance evaluation of a laboratory-scale cooling system as a household refrigerator with phase change materials
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2022
The test setup built in a previous study (Kiran-Yildirim et al. 2021) and its schematic diagram are represented in Figure 1. The setup mainly included a compressor, an evaporator, a condenser, an expansion valve, and a cabinet with an inner volume of 72 liters. The cabinet has internal dimensions of 0.435 × 0.390 x 0.425 m. A fan was integrated on the cabinet sidewall to provide the homogeneity of the cabinet air temperature. The evaporator was placed in the cabinet backside wall. Free convection heat exchangers were used as an evaporator and a condenser. The compressor was a hermetic reciprocating compressor. A data logger unit recorded the refrigerant temperatures measured by the temperature sensors, with ± 0.5% accuracy, at the inlet and outlet of the evaporator, the compressor, and the condenser. The mass flow rate of the refrigerant circulating through the system was recorded. R404A was circulated in the system as a refrigerant. The accuracy of the mass flow meter is ± 0.5-digit. Simultaneously, the thermostatic controller measured the cabinet air temperature with ± 1.0-digit accuracy. The network analyzer device recorded the power consumption with ± 1.0-digit accuracy.
Resonance analysis of opposed piston linear compressor for refrigerator application
Published in International Journal of Ambient Energy, 2019
Suneeta Phadkule, Sohel Inamdar, Asif Inamdar, Amit Jomde, Virendra Bhojwani
The modern linear compressor technology offers various advantages over a reciprocating compressor. This is the most popular among recent compression technologies. It uses a spring–mass arrangement (the piston mounted on a mechanical spring system) driven by a linear motor. An opposed piston linear compressor uses a linear motor for reciprocation of the piston, hence directly reducing the frictional losses involved in the reciprocating compressor. Since, the motor forces are in the direction of motion of the piston, side forces are zero. Hence, it leads to a silent operation. This arrangement reduces frictional losses and other mechanical losses, increasing the efficiency. The progress in the fields of cryogenics, refrigeration and air conditioning has kept increasing demands for the development of the compressors with higher efficiencies.