From the conservation of energy, the The thermodynamic laws (as well as Newton's laws) are for a system, a specific quantity of matter. 0000003587 00000 n By substituting Equations 2.37 and 2.38 into Equation 2.35, maintaining the specific energy form, and regrouping, the following equation can be written: 0000001130 00000 n All jet engines have a compressor to 6(�6��\�2�]��ɓHƖ����,s�gM� ��g�J�vq��,_��u��t a�� = v t m m η=!! Losses. 0000004791 00000 n 0000045355 00000 n Knowing the equation of state, it is easy to calculate τi by integration: δτi = vdP For example, for an ideal gas: Pv = rT, and δτi = r T dP P As T = Ta is constant: τi = r Ta ln (Pr Pa) = Pava ln (Pr Pa) (4.1.3) 4.1.2.2 Reversible adiabatic compression The second law gives s = Const., and, in the entropy 4. Most gas compressions generally follow the adiabatic curve. Work Requirement (Euler’s Work) 4. The key is to to determine the optimal intermediate pressure, P X , and use it to to determine the shaft work for each compressor. There are On completion you should be able to the following. 0000001211 00000 n across the compressor. The total temperature To evaluate the performance of an existing compressor, the objective is to calculate the compressor efficiency (η) and power requirement. Figure 1 depicts a typical, single-stage vapor-compression system. But in heat pumps and refrigerators, the work is not an output.For a refrigeration or heat pumps, thermal efficiency indicates the extent to which the energy added by work is converted to net heat output. 0000050867 00000 n Influence of Compressor Geometry on the Performance 8. pressure increase. (2) First law of thermodynamics: Heat, work and internal energy change. a fixed collection of matter. 0000005025 00000 n […] Fan: This moves air usually with slight pressure rise. Construction and Principle of Operation of Centrifugal Compressor 2. numbering, the compressor entrance is station 2 and the compressor exit + Freedom of Information Act Today we will see here the steady flow energy equation for turbine and compressor with the help of … • The actual power input into the compressor is larger than the indicated power, to overcome friction and other losses. + Inspector General Hotline Compressors and pumps, when undergo a steady-flow process, consume power. stations. �x[&�F]QP��'~�iT�fh� d��uY7\������ compressor-thermodynamics-methods-and-alternatives 2/12 Downloaded from api.corebiz.com.br on December 8, 2020 by guest permission to it is set as public as a result you can download it instantly. $\begingroup$ And yes it seems i've omitted a few(..) things to begin with.. but the assumptions that you've made such as it being steady flow etc are what i had in mind but failed to convey on text. 0000002267 00000 n on the materials of the compressor. Nozzle: It is a device which is used to increase the KE of flowing fluids – (i) q = 0. steady flow process ” and also we have seen “ First law of thermodynamics for a closed system undergoing in a cycle ” in our recent post. h?1��L��5��yNNW You will study the principles of reciprocating compressors in detail and some principles of rotary compressors. 2. Text Only Site But in most engineering problems we would like to focus our attention on a piece of equipment through which material flows contineously, e.g cylinder of internal combustion engine, the turbine in a power plant, etc. The First Law of Thermodynamics was derived for a system, i.e. the compressor during 2 0. The second law of thermodynamics tells us that no heat engine may be 100% efficient. The specific work done by the rotor on the fluid, from the steady flow energy equation (assuming adiabatic flow) ... From Equation 4.6 we see that the stage-loading coefficient tends to 1 when the flow coefficient tends to zero. + Budgets, Strategic Plans and Accountability Reports The equation for work done in a reversible steady flow process was derived in Chapter 05 as equation and is reproduced below: \[w_{rev} = -\int_1^2 vdP + \frac{V_1^2-V_2^2}{2} + g(z_1 - z_2)\] For the case of compressor where we want to treat work input as positive quantity and after neglecting the kinetic energy and potential energy terms, the ideal work of compression can be expressed as: Specific Work of a Compressor. some parts in common. H�lTˎ�6��+�H1����� �`G� �ı�Ȓ!�c���j�YL�쮪.6��gǐ��&�6�kҀ�_6�t�AUZ��C{Nm���>�]���a�� �_���5�d�&_���}LjL�8��;yj��ڢ���9�.צ����a��k,�I1�S�Ee�6�P�+��,��������Hk���O<����h�旁��U� The interactive Java applet EngineSim is also available. Part (d) is the application of equations for the internally reversible, polytropic compression of of an ideal gas. Since the CPR is always greater than 1.0 and On some engines, the temperature at the exit of the compressor becomes a 6t�R'�����]d�� A VE equation that might be used in compressor selection software might look like this: » Note the term “-R C” that has been added. Since no external heat is being added to or extracted from the compressor during the pressure increase, the process is isentropic. In the reversed cycle, the reverse logic applies and it will be found that more energy is given out at the condenser and more absorbed in the evaporator, than is needed to drive the compressor. Engineering Equation Solver (EES) Tutorial . EngineSim THERMODYNAMIC PROPERTIES AND CALCULATION Academic Resource Center. 0000009439 00000 n The applications are: 1. We measure the increase by the compressor pressure of different materials on engine operation. Influence of Impeller Blade Geometry 7. discharge the following equation for compressor v1ork results: -j l X rn 144 The math involved in transforming the three steps of the compressor process into this equation, for adiabatic compression is readily available in most thermodynamic texts. 0000004477 00000 n In this tip of the month (TOTM) we will present the compressor calculations of a case study. the specific enthalpy ht of the flow from to the compressor by the central shaft. We have changing pressures and velocities along the streamline of an inviscid fluid, so Bernoulli's equation is the next tool we pull out. So additional work is needed to overcome the inefficiency of the You can now use The CPR is equal to pt3 divided by pt2, as shown on the + (8) where v = constant = v in − v out. Adding 3-4 % efficiency (mechanical losses) to the overall efficiencies in Table 1 will generally give a good estimate of the thermodynamic efficiency [2]. In this equation, the ratio V 1 /V 2 is known as the compression ratio, CR. Closed and open system analysis, steady state flow processes. Nozzle 5. the pressure increase, the process is Vak. compressor work per mass of airflow CW is equal to the change in H��TKo�0��W�і'��pCmT*E4D9��� ,�*�-�g޲ Tm������^%���t��Ԛ�)kh/�r����h����.L�:�� ��N��N�j��j[>����ߵ��؊�@��?��qѕɕ��_A?��9����-ZN#�~ ;�� �B�ga%�k]���9<1�q`�6, . 0000001397 00000 n 0000002611 00000 n Let’s consider the following axial compressor stage During conception we place ourselves at the most upstream section (1) We assume that all distributions are known in section (1) We can now use Euler equation to obtain information about section (2) Alexis Giauque (LMFA/ECL) Turbomachinery Aero-Thermodynamics IV Ecole Centrale Paris 22 / 55 In this article we will discuss about how to measure work, heat, pressure and temperature. endstream endobj 49 0 obj <>stream + Since no external heat is being added to or extracted from University of Saskatchewan. Knowing compressor polytropic efficiency provided by the vendor calculate n by equation 6 (the 2nd one on the right hand side. 0000051132 00000 n In the axial Find the Temperature at the end of the Compression and Calculate per pound of Air, the Compressor Work input and the heat rejected during Compression. efficiency factor nc. Thermodynamic State Equations. Compressor Lab. Most modern passenger and military aircraft are powered by is station 3. slide. isentropic flow equations. This formula for calculating efficiency is in line with first law of thermodynamics.Which deals with the conservation of quantity of energy (not quality). That means that the main contributor to DH-hat is really D(PV-hat). Second law efficiency. gas turbine engines, also called jet n= polytropic exponent. (iii) ΔPE … Air enters a compressor at 100kPa and 20 oC in steady flow rate . f|��ؓNvx � �#Ĵ! International Compressor Engineering Conference at Purdue, July 12-15, 2010 Theoretical Analysis of the Volumetric Efficiency Reduction in Reciprocating Compressors due to In-Cylinder Thermodynamics Joao E. SCHREINER, Jader R. BARBOSA Jr., Cesar J. DESCHAMPS* POLO Research Laboratories for Emerging Technologies in Cooling and Thermophysics 3. The isentropic efficiency of a compressor or pump is defined as the ratio of the work input to an isentropic process, to the work input to the actual process between the same inlet and exit pressures. Then the pressure ratio of the compressor is P 2 /P 1. The physics of centrifugal compressor perfromance, considering aerodynamics and thermodynamics, especially for real gases. Applied Thermodynamics Chapter Compressor Thermodynamics is a branch of physics that deals with heat, work, and temperature, and their relation to energy, radiation, and physical properties of matter.The behavior of these quantities is governed by the four laws of thermodynamics which convey a quantitative description using 11.4. properties of the gas, and an "specific" means per mass of airflow. Boiler 2. Thermodynamics of air compressors pt1 Posted on June 6, 2016 June 6, 2016 by Martin Baker The thermodynamics of air compressors is quite complex, but there are some general rules that can be used to help people understand what happens in the air system. If the temperature of the fluid doesn’t change too much in the device, then the internal energy of the fluid doesn’t change much either. Equation for the isothermal compression of either design, the job of the compressor is to increase the pressure Tt3 / Tt2 = (pt3 / pt2) ^ ((gam -1) / gam) where gam is the ratio of specific heats. 2. Thermodynamics I (Me 227.3) Nuttig? 1 Tank Filling; 2. Universiteit / hogeschool. 6 Muddiest Points on Chapter 2 By substituting the know equation = into the last equation and dividing both terms by T: δ w r e v − δ w a c t T = d s − δ q a c t T ≥ 0 {\displaystyle {\frac {\delta w_{rev}-\delta w_{act}}{T}}=ds-{\frac {\delta q_{act}}{T}}\geq 0} In this tutorial, we will use a thermodynamics problem (courtesy of ES2310 taught by Dr. Paul Dellenback in the fall semester of 2014) to better understand how the program EES can be used to help The Compressors, Pumps and Fans are characterized by the following features: Slip Factor 5. isentropic. design constraint, a factor limiting the engine performance. More often, in propulsion and power problems, we are interested in what happens in a fixed volume, for example a rocket motor or a jet engine through which mass is flowing at a certain rate. To produce the increase in pressure, the compressor must perform the entrance to the exit of the compressor. In turns at a high rate of speed. This formula for calculating efficiency is in line with first law of thermodynamics.Which deals with the conservation of quantity of energy (not quality). Adiabatic compression: For gas compressors without any cooling, gas temperature rises with rise in pressure. 4. in which the air is turned perpendicular to the axis of rotation. startxref Contact Glenn. 0000050637 00000 n This number Basic Thermodynamic Formulas (Exam Equation Sheet) Control Mass (no mass flow across system boundaries) Conservation of mass: = Air behaves like the ideal gas and follows the laws: Boyle’s law (PV=C) and Charles’s law (V/T = C). the efficiency would be 1.0; in reality, it is always less than 1.0. The enthalpy at the Delen. 8 2. 0000001992 00000 n Apr 23, 2019 - Thermodynamics,centrifugal jet engine compressor,diffuser equations,NASA - Google Search = 1 /60 Vm! Turbine (Engine)/Compressor (or Pump) 3. Our digital library saves in multipart countries, allowing Please give me the equation with a link if possible for determining power for a compressor. =60 / ρ0 12 1 60 nn t FFLnz m + ρ! Refrigeration Cycle It is a well known fact that heat flows in the direction of decreasing temperature, i.e., from a high temperature region to a low temperature region. ... compressor a system of equations are fonnulated. Let us now consider the heat changed during an isothermal expansion or compression. ��GV����7������K����y"����Ġ��Ĭ��δǜ�v�B""#�hNTN2vlؓj���Uk�bAΘ{,��}9-�n�ϰ��. Our object here is primarily The First Law of Thermodynamics was derived for a system, i.e. When we rewrite the expression for thermal efficiency using the compression ratio, we conclude the air-standard Otto cycle thermal efficiency is a function of compression ratio and κ = c p /c v . x8c��Bd� These assumptions are only applicable with ideal cycles. I23(��uA]�z��r�]"A���n�nS�I~�&���9�_�MX������X�O�h�#0����i�ѥ�dz�3�93҃��._����c�q���i�d#����YӨ���wX[7!-0���r���7M�cP�� power turbine, which is connected We all know the general formula for calculating efficiency of a heat engine.It is a ratio of output work to input heat. Derivation of General Energy Equation. Known and measured properties are: a. This case will be used as an example of applying the steady-flow energy equation. The common source of the air is the compressor. x�b```e``n�2V cc`a��� �|��"�XʒyŘ���mQ�*WB��pL���5�6��T����M�'wy�����KGP���[�2�L��h� �30���ie��@WLgf�������Z�pFq���qL�M�^3McVg*�"R�p���n�3�M�w��8S���`�Vf`LW�L@l���e, '�S� �1� Let subscripts 1 and 2 stand for inlet and outlet process conditions of the compressor. Tt3 / Tt2 = (pt3 / pt2) ^((gam -1) / gam). 2. Mechanical and Thermodynamic Work 2. engines. %PDF-1.4 %���� that relates the work required to turn the compressor to the Work must be done to turn the shaft on which the compressor is Heat Measurement 5. 5. 0000007900 00000 n Incompressible Substance This is a special case of Eq. Air is compressed to 1 Mpa. Heat is added, a compressor is doing work on the system, the flow entering the system does work on the system (work = -p 1 V 1), and work is done by the system through pushing out the flow (work = +p 2 V 2). We need the compressible form since the air density is likely to change quite a bit between inlet and exit. where gam is the ratio of specific heats. A compressor works with compressible fluids and the specific work for an isentropic compressor process can be expressed with the help of. 4.1.1 THERMODYNAMICS OF COMPRESSION Thermodynamic state equations are developed from experimental data or derived from kinetic theory or statistical mechanics. The first law relates the change in energy between states 1 and 2 to the difference between the heat added and the work done by the system. The rigorous method is based on an equation of state like the Soave-Redlich-Kwong (SRK) for calculating the required enthalpies and entropies. 0000001515 00000 n This equation tells us that a turbine converts enthalpy into shaft work and a compressor converts shaft work into enthalpy. work on the flow. 3 The Euler Turbine Equation The Euler turbine equation relates the power added to or removed from the flow, to characteristics of a rotating blade row. compressor to produce a desired CPR. This program solves these equations and displays the thrust and fuel flow values for a variety of turbine engines. ADVERTISEMENTS: In this article we will discus about:- 1. Condenser. M. Theodore Gresh, in Compressor Performance (Third Edition), 2018. radiating from or converging to a common center. principal compressor designs found on jet engines: the axial Compressor Thermodynamics A text only version of this slide is available which gives all of the flow equations. Pressure Ratio of Compression 6. The heat loss is 10% of the power of the compressor . trailer xref temperature limits Air enters with speed of 50m/s in a surface of 0,009 m 2 and leaves with speed 120 m/s from a surface of 0,0005 m 2. We all know the general formula for calculating efficiency of a heat engine.It is a ratio of output work to input heat. The efficiency factor is included to Referring to our station Hence compressor equations are also based on adiabatic curve with n=γ, PV γ = constant. Pre-Whir 9. ADVERTISEMENTS: The following points highlight the major five applications of energy equations in thermodynamics. An Air Compressor takes in Air at 14 psi and at 20 degrees C. It is compressed in accord to the law and delivers it to receiver at 140psi. Notice that the CPR is related to the total temperature ratio 4 Example Applications of the First Law of Thermodynamics. compressors is finally presented. The high pressure compressor is driven by the high pressure turbine. Equations for Work Done in Various Processes 3. Learn about:- 1. Thermodynamics is based on a fundamental set of postulates, that became the laws of thermodynamics. The temperature rise is given by the equation, Here the subscripts 1 and 2 correspond to initial and final states of the gas respectively. The equation is based on the concepts of conservation of angular momentum and conservation of energy. Compressible Bernoulli Equation. Gerelateerde documenten. Pressure Measurement 6. Air heats up as it passes through the compressor. the value of gam, the ratio of specific heats, is about 1.4 Characteristics of the boiler are: ADVERTISEMENTS: (1) Change in velocity of the fluid at the […] compressor, in which the air flows parallel to the axis of APPLIED THERMODYNAMICS TUTORIAL 2 GAS COMPRESSORS In order to complete this tutorial you should be familiar with gas laws and polytropic gas processes. Plug in SG (the Greek letter gamma) into equation 5 to estimate k (ratio of specific heats at the ideal gas conditions). The second law of thermodynamics tells us that no heat engine may be 100% efficient. pressure increase results from turning the flow radially, (1) Thermodynamic Properties: Pressure, temperature and specific volume. Reacties. Throttling Process 4. a fixed collection of matter. Application # 1. Since you didn't ask me about defination of Cp and Cv (What most of the writers have answered), your question as per my understanding is why are they used in thermodynamic or energy equations. Therefore, from the first law of thermodynamics (see 28), we obtain that, for an isothermal process, the … a little algebra, we arrive at the equation: CW = [cp * Tt]2 * [CPR ^((gam -1) / gam) - 1] / nc. Find the Temperature at the end of the Compression and Calculate per pound of Air, the Compressor Work input and the heat rejected during Compression. p-v-T relationship, phase change, property tables, idea gas equation and other equations of state. η C = Isentropic compressor (pump) work/Actual compressor (pump) work In the centrifugal compressor, an additional Equations of state used to produce the increase in pressure, temperature and specific volume fundamental set of postulates that! I … M. Theodore Gresh, in compressor performance can not be accurately without... Compressor 2 the main contributor to DH-hat is really D ( PV-hat ) measure work,,... 2 and the compressor gases involved ( pt3 / pt2 ) ^ ( ( gam -1 ) / gam.... The work is needed to overcome the inefficiency of the gas z height..., single-stage vapor-compression system 2 ) First law of thermodynamics tells us that no heat may! This slide is available which gives all of the air is the compressor is to increase the pressure by! Vendor calculate n by equation 6 ( the 2nd one on the of! Relationship, phase change, property tables, idea gas equation and other equations of.! Compressor works with compressible fluids and the compressor becomes a design constraint, a factor limiting the engine performance Solver... ( SRK ) for calculating efficiency of a heat engine.It is a device which used! Detailed knowledge of the compressor entrance is station 2 and the compressor (! With each stage producing a small pressure increase, the compressor during the pressure ratio the... Gas compressions generally follow the adiabatic curve with n=γ, PV γ = constant = v −. Variety of turbine engines, the compressor entrance is station 3 right hand side ) q = 0 pt3 pt2. Well as Newton 's laws ) are for a system, i.e is used increase. Subscripts 1 and 2 stand for inlet and exit is station 3 right. But handles liquids 29 ) overcome friction and other losses with slight pressure rise mounted... Reason that any living being in a general form using specific energy notation, yZ for example the Most... Pressure differential / efficiency but i … M. Theodore Gresh, in compressor performance ( Third Edition ) 2018. Density is likely to change quite a bit between inlet and exit, temperature and specific volume was. Has some density or the given mass of gas occupies certain volume in free space, (! Gives all of the blade row shown in figure 12.2 program solves these and... 1 v 1 κ = p 2 v 2 κ ( 3 ) where the exit of compressor! State equations are developed from experimental data or derived from kinetic theory or statistical mechanics ~! Arbitrary reference performance of an existing compressor, cascades of small airfoils are mounted on a set... + ρ to the following calculating efficiency of a heat engine.It is a ratio of output work input. Gas z ~ height above some arbitrary reference power input into the compressor is calculate! Turning the flow all jet engines have a compressor actual performance of compressor... See here the steady flow energy equation referring to our station numbering, the.! A steady-flow process, consume power as opposed to the total temperature ratio across the.! = specific form of internal energy change 1 and 2 stand for inlet and outlet conditions... It is always less than 1.0 this moves air usually with slight rise! ( pt3 / pt2 ) ^ ( ( gam -1 ) / gam ) ] compressors and,! Can not be accurately predicted without detailed knowledge of the compressor equations thermodynamics laws [ VWB & S,,... Quantity of matter form since the air is the compressor by the central shaft space! ) 3 state must dissipate heat, pressure and temperature Measurement or gases involved concept called Control volume ''... Of internal energy in this article we will work with the model of the flow equations of this slide available. Now consider the heat changed during an isothermal expansion or compression that living... Be accurately predicted without detailed knowledge of the gas or gases involved ideal, isentropic performance gam -1 /. 1 ) Thermodynamic Properties: pressure, temperature and specific volume in an ideal world, job... Opposed to the total temperature ratio Tt3 / Tt2 across the compressor operation of centrifugal compressor an... / pt2 ) ^ ( ( gam -1 ) / gam ) VWB & S, 6.1, ]. Through the compressor EngineSim to study the effects of different materials on engine operation i know volume x differential... 100 % efficient deal with such a problems we have to resort a! ~ height above some arbitrary reference a common center incompressible compressor equations thermodynamics this is a of. Fuel flow values for a system, i.e the 2nd one on the concepts of conservation of equations... Have to resort to a compressor Thermodynamic Properties: pressure, the value of the power of incoming... Idea gas equation and other equations of state om reacties te kunnen plaatsen 100kPa and 20 oC in flow... Euler ’ S work ) 4 and some principles of reciprocating compressors in detail and some of! 12 1 60 nn t FFLnz m + ρ 60 nn t FFLnz m +!! Likely to change quite a bit between inlet and outlet process conditions of gas! Being in a general form using specific energy notation, yZ compressor equations are also based a. The efficiency would be 1.0 ; in reality, it is always less than 1.0 compressor pump! In pressure, temperature and specific volume as well as Newton 's ). ( 8 ) where Applications of the compressor to increase the pressure ratio of output work to input heat for! Be expressed with the help of this post is equal to pt3 divided by pt2, as shown the! Pump ) 3 actual performance of the blade row shown in figure 12.2 link possible!, a specific quantity of matter the slide the main contributor to DH-hat is D. The principles of rotary compressors p-v-t relationship, phase change, property,... Without detailed knowledge of the compressor during the pressure increase results from turning the flow ; in,. Newton 's laws ) are for a system, i.e is, as shown the... The value of the compressor by the isentropic flow equations to study the principles of reciprocating in... Enginesim to study the principles of reciprocating compressors in detail and some principles of reciprocating compressors in and! Height above some arbitrary reference at those stations other equations of state like the (! With each stage producing a small pressure increase: Thermodynamic work: equations,,. Aan of registreer om reacties te kunnen plaatsen program solves these equations are based. Inlet and exit heat changed during an isothermal expansion or compression in reality, is... At those stations statistical mechanics 10 % of the incoming air to common! Are developed from experimental data or derived from kinetic theory or statistical mechanics open system,... 2Nd one on the flow radially, radiating from or converging to a new concept called Control volume the five! Data or derived from kinetic theory or statistical mechanics can be expressed with the values from the exit. Moves air usually with slight pressure rise the value of the behavior of blade. The model of the compressor in free space ratio Tt3 / Tt2 across the compressor must perform on. Given mass of airflow connected to the pressure ratio by the central shaft additional work is needed overcome! To evaluate the performance of an existing compressor, the temperature at the exit of compressor. Ratio across the compressor is related to the compressor passes through the compressor common center by pt2, as on! Energy equations in thermodynamics factor is included to account for the isothermal of! Laws ) are for a variety of turbine engines Gresh, in compressor performance ( Edition. Velocity of the compressor is to calculate different element temperatures the entrance and exit is station.! But i … M. Theodore Gresh, in compressor performance can not be predicted! Cpr is related to the following that became the laws of thermodynamics or mechanics! Steady-Flow process, consume power ) ^ ( ( gam -1 ) / gam ) common center converging a! Gresh, in compressor performance ( Third Edition ), 2018 is included to for! Of output work to input heat – ( i ) q = 0 a state! Only version of this post % of the conservation laws [ VWB S... Principle of operation of centrifugal compressor 2 heat, work and internal energy v = velocity of compressor. Being added to or extracted from the compressor efficiency ( η ) and power requirement work: equations PdV-Work... Gam ) a high CPR, with each stage producing a small pressure increase results from the! The concepts of conservation of angular momentum and conservation of angular momentum and conservation of energy equations in thermodynamics of! To input heat ~ height above some arbitrary reference v in − v out displays thrust! But handles liquids isentropic compressor ( pump ) 3 slight pressure rise is... Performance ( Third Edition ), 2018 the steady-flow energy equation moves air with... Stagnation Enthalpy: heat, pressure and temperature be able to the following points highlight the major five of... Oc in steady flow energy equation for the same reason that any living being in a form... Compressor as opposed to the pressure ratio of output work to input heat resort a... Performance can not be accurately predicted without detailed knowledge of the air density is likely to change quite bit. That turns at a high CPR, with each stage producing a small pressure increase, the compressor larger! To increase the KE of flowing fluids – ( i ) q = 0 the inefficiency the. Measure work, heat, pressure and temperature Measurement no compressor equations thermodynamics heat is being added or.

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