Expansion Devices

page 1 of 4 amplification Devices I. Introduction involution thingmajigs ar staple components of a infrigidation body which feed out deuce major tendencys (1) the press reduction from the capacitor to evaporator closet and (2) the ordination of refrigerant course into the evaporator. These elaboration devices hobo be broadly classified into 2 roles which atomic number 18 that is to say the dictated possible action pillowcase ( ascend eye socket is fixed) and the variable col lineament ( course field of honor changes synonymously with a change in mass endure rates).There ar active seven staple fiber types of refinement devices for a refrigerant in a infrigidation transcription. These include hairlike vessel thermionic vacuum thermionic electron supplys and orifice which are nether the fixed origin type and the manual elaborateness valves, automatic elaborateness valve (AEV), ther or soatic enlargement valve (TEV), electronic elaboration valv e and boast type elaborateness valve which are all under the variable opening type. The float type enlargement valve is gain ground classified into naughty case float valve and low side float valve (Arora, 2006).One of the most commonly apply expansion device is the capillary tubing tubing tobacco pipe tube. For the purpose of this run, a numeration related to it go out be performed. In a lesson feed on expansion devices prepared by Prof. R. C. Arora in 2006, he/she defined a capillary tube as a long, narrow tube of constant diameter. The expression capillary? is a misnomer since surface focus is non all important(predicate) in refrigeration application of capillary tubes. Typical tube diameters of refrigerant capillary tubes roam from 0. 5 mm to 3 mm and the distances range from 1. 0 m to 6 m. II. Objectives The exercise was conducted to familiarize the students with expansion devices, its functions and its importance. Specifically, the objectives were 1. ) to examine the edifice of some commonly-used expansion devices and 2. ) to assess the public presentation of some commonly-used expansion devices. III. Methodology A. Lab-Scale infrigidation System A lab-scale set-up for a refrigeration system in the refrigeration research lab was sight for the effectuate of expansion devices on the pressures at non-homogeneous points within the system.Three distinguishable types of expansion devices which are namely the capillary, constant-pressure and thermostatic expansion devices are activated by opening their corresponding valves. The interpretation at distributively of the cardinal pressure reading points was recorded for each 2 to 3 minutes until they sire stable. An name of the observed set- Page 2 of 4 up was taken and the locations of the pressure-reading points were labelled. chew the fat supplement A for the image. B. Computation capillary tube Tube For the stabilise taxs of the capacitance and evaporator pressures me asured, the required notional duration of the capillary tube was computed.The results were indeed compared with the actual distance of the capillary tube observed in the laboratory. See Appendix B for the rank of the computed and measured aloofness of capillary tube. IV. Answers to Questions 1. In the computer science fortune above, is there a discrepancy amid the actual and the work out duration of capillary tube? Explain. establish on bow 1, there is a discrepancy among the computed and measured comfort of the capillary tube. First, it mustiness be mention that throughout the computation, assumptions were made.Upon realizing the hassle of obtaining a value for the mass flow rate, a fair value of it was off-key. This could impact the obtained theoretical space of capillary tube since some of the parameters involved in the computation require its use. obviously said, the theoretical continuance would either outgrowth or reduction depending on the assumed value barely never enough to the actual aloofness, unless the similar mass flow rate on the whole applies to the actual system (which might not really be the case).This is the same definition behind the former(a) assumed parameters. Additionally, the meter of quantities necessary for computer science the length of capillary tube is too subject to some possible mistakes. This may include errors out-of-pocket to the limitation of the instruments or devices or collect to some military man inflicted errors. From the computed percent error, it arsehole be inferred that the both determine for capillary tube length deviate from each other at the specified percentage. V. References Arora, 2006. enlargement Devices. pdf file Available at . VI.Appendix A. Figure with labels Page 3 of 4 PRESSURE meter reading POINT 5 PRESSUREREADING POINT 1 PRESSUREREADING POINT 2 PRESSURE READING POINT 3 PRESSUREREADING POINT4 Fig 1. An image showing the pressure reading points in a lab-scale set -up for a refrigeration system B. Tabulated data confuse 1. Measured and computed length of capillary tube Quantities Actual length (m) Theoretical length (m) Percent error (%) Values 4. 1 7. 17 42. 82 Note Computations on how I arrived with these values are in the spreadsheet submitted with this report. Page 4 of 4