2387‚ Page 1 Control of an Electronic Expansion Valve Using an Adaptive PID Controller Antônio A. T. Maia*‚ Marconi A. Silva‚ Ricardo N. N. Koury‚ Luiz Machado‚ Alexandre C. Eduardo Federal University of Minas Gerais‚ Mechanical Engineering Department‚ Belo Horizonte‚ Minas Gerais‚ Brazil Phone: + (55 31) 3409 6667‚ Fax: + (55 31) 3443 3783‚ e-mail: aamaia@ufmg.br ABSTRACT In many refrigeration systems‚ electronic expansion devices have been used to replace the conventional expansion devices
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introduction of the new proposed light weight compressor. This course of action must remain within the production capacity restrictions the company faces. Alternatives Status Quo: The company will continue to produce the standard compressor to satisfy the requirements for the automatic paint system and the demand that currently exists for this product. Introduce Light Weight Compressor: The company will introduce the new light weight compressor to replace the standard unit in the automatic
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................ ................................ ................................ .... 11 FIRST STAGE COMPRESSOR ABSTRACT This experiment is done to analyse the variation of performance with pressure for a two stage reciprocating air compressor. The objective of this experiment is to investigate the effect of delivery pressure on the performance of a reciprocating air compressor. The
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CATAWBA INDUSTRIAL COMPANY 1. Is the company correct in its practice of not manufacturing standard model compressors on Sundays because of the accounting loss incurred on each unit? As per the cost structure given in the case‚ Selling costs‚ Sales and Administration costs‚ Depreciation and other manufacturing overheads have been considered to be variable costs‚ i.e. per unit costs and hence have been accounted for in the calculation of profit and loss. As such‚ this methodology is resulting
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Is the company correct in its decision of not manufacturing standard model compressors on Sundays? Why? Show your calculations. Decision making should be based on change of RELEVANT items ONLY. The company’s calculation is WRONG‚ as it takes into concern of irrelevant fixed cost. By double-counting depreciation‚ other Mfg. overheads‚ SG&A in Sunday’s cost; it distorts the P&L sheet. To correctly show cost structure for decision making‚ there are two different approaches‚ yet each should reach
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different kinds of mechanical devices used to transport fluids‚ namely‚ pumps‚ fans‚ blowers and compressors. Though liquids particularly can be transported by operators carrying buckets‚ the usual mode of transport of fluids is through pipelines with pumps‚ compressors‚ fans and blowers. Generally‚ the word “pump” designates a machine or device for moving an incompressible liquid while fans‚ blowers and compressors are devices for moving gas (usually air). PUMPS There are three common types of pumps:
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June 28‚ 1994 Catawba Industrial Company op yo Marge McPhee‚ general manager of the compressor manufacturing department of Catawba Industrial Company‚ quickly spotted the reports that she had been waiting for in the pile of mail that had accumulated during her trip to a West Coast industrial equipment trade show. A sales forecast and a cost tabulation for a proposed new‚ light-weight compressor provided her with the information she needed to ascertain whether or not to introduce it‚ what
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Project – “Stereo Audio Compressor” Starting speech Audio compressors that use a light source to control a Light Dependent Resistor (LDR) are not new‚ and indeed there are many classic optical compressor designs. The design goal of the SOC-1.1 was to further enhance the attributes of optical compression to provide the user with alot more functionality as well as improve the compressor response to real world audio signals. We have carefully examined the characteristics of the LDR and developed
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........... 5 Compressor Theory ................................................................................................................................... 6 I. II. III. I. II. I. II. I. II. III. I. II. III. Compressor Pressure (expansion) Ratio [equation 1] .................................................................. 6 Compressor Power ........................................................................................................................ 6 Compressor Thermal Efficiency
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.. 100‚000 20‚000 Compressor parts fabrication.......... 120‚000 5‚000 Compressor assembly and test........ 180‚000 45‚000 Total $480‚000 80‚000 Normally‚ the air conditioners are produced in batch sizes of 20 at a time. A production batch of 20 units requires the following number of hours in each department: MaxiFlow Alaska Radiator parts fabrication........... 28 16 Radiator assembly‚ weld‚ and test....... 30 74 Compressor parts fabrication......... 32 8 Compressor assembly and test..
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