Energy performance of the refrigeration systems
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Added on 2021-05-30
Energy performance of the refrigeration systems
Added on 2021-05-30
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1Energy performance of the refrigeration systemRefrigeration system
2Energy performance of the refrigeration systemContentsExecutive summary.....................................................................................................................................3Introduction.................................................................................................................................................4Methodology...............................................................................................................................................6p-h diagram.................................................................................................................................................6schematic diagram of standard vapour compression system..................................................................6Performance curve......................................................................................................................................7Calculate and plot other characteristics (efficiencies).................................................................................8Thermal Power........................................................................................................................................8Thermal power dissipation for 1st condenser of 300C..........................................................................8Thermal power dissipation for 2nd condenser of 350C.........................................................................9Thermal power dissipation for 3rd condenser of 400C........................................................................10Graphical presentation of the Thermal power dissipation against evaporation temperature..............11Energy Efficiency Ratio -EER.....................................................................................................................12Energy efficiency ratio for 1st condenser of 300C.............................................................12Energy efficiency ratio for 2nd condenser of 350C............................................................14Energy efficiency ratio for 3rd condenser of 400C............................................................17Calculation of Carnot COP for the three types of condensers.........................................20COP for the first condenser with condensing temperature of 300C..........................20COP for the first condenser with condensing temperature of 350C..........................22COP for the first condenser with condensing temperature of 450C..........................23Graphical presentation of COP against Tc (0C)......................................................................25Discuss the performance characteristics of the system and their implications with respect to system design and optimal operation....................................................................................................................26References.................................................................................................................................................28
3Energy performance of the refrigeration systemExecutive summary The commercial reciprocating chiller is an advance electronic equipment that uses its ability to removes heat from liquid using vapor-compression technology, which is the method by which a commercial reciprocating chiller's compressor evaporates heat from the refrigerant, and since they contain the reciprocating compressors it uses pistons to compress the refrigerant and the liquid, which causes heat evaporation in the piston chamber, all this will facilitate a reduction in the temperature of liquids for industrial applications. Above all commercial reciprocating chillers utilize four main components; that is a compressor, an evaporator, a condenser and a metering device. In addition, it operates with a closed-loop system, this means that the coolant will have to remain in the chiller and it will be recycled across many uses. The importance of this closed-loop commercial reciprocating chillers is that, itcontains a separate tank that filters and cleans the coolant before returning it to the main storage area for re-use.In summary, commercial reciprocating chillers uses a chemical refrigerant to absorb heat and remove it from the liquid being chilled. With Freon refrigerants being the most used.
4Energy performance of the refrigeration systemIntroduction Majorly restriction has been injected by the Standard thermodynamics on the thermodynamic measures and all this is grounded on reversible assumptions, which will mean either a zero rate of operation or infinite system size. The extension of thermodynamic analysis in order to include the finite time constraints was facilitated by the finite time thermodynamic, which derives a moreaccurate restriction on the performance. This method of finite time thermodynamic has been usedmajorly in several thermodynamic systems. Previously the heat engines were used extensively, with maximum power efficiency production expression that is derived from two heat reservoirs at temperaturesandunder the limitation of Newtonian heat transfer which is given by expression; ȠCA = 1- √TcThThe invention of reciprocating chillers lead to analysis and its characteristics was compared to experimental data. The heat leakage and friction on the performance in line with engines were totally addressed and the features were described using either power degradation or power coefficient of performance coordinates.Numerous objective functions have been proposed. Where combination of both maximization of power with maximization of losses (entropy production)Extensive merit has been observed through ecological coefficient of performance which is defined as the ratio of the cooling load to the rate of availability loss (or entropy generation rate).The present study of the finite-time analysis of refrigeration or heat pump systems, has an inclusion of friction, solid, and fluid, with an aim of increasing the importance of source of dissipation. The characteristics are shown in graph of the cooling rate (r) versus coefficient of performance (ω) coordinates, from this observation a comparison is drawn to the characteristics of real refrigeration or heat pump devices, which later results to a proposal an estimation of temperatures of the working fluid of the hot and cold side.
5Energy performance of the refrigeration system024681012024681012Coefficient of performance (ω)coolingrate(r)Fig 1; cooling rate versus coefficient of performance.The presentation of the finite heat transfer rate is the sole source of heat losses [the dashes curved]The four limiting types of operation includes;i.Open circuit in which both (r) and (ω) vanishes in the limit of slow operation ii.Short circuit in which both (r) and (ω) vanishes but the limit of fast operation iii.Maximum (r) iv.Maximum both (ω)
6Energy performance of the refrigeration systemMethodology p-h diagram 0501001502002503003500246810121416Chart TitleEnthalpy kJ/kgpressure(bars)schematic diagram of standard vapour compression system
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