(8) A refrigerant 12 refrigeration system requires a loada of 54 kW at an evaporator pressure of 270 kPa and a condenser pressure of 1009 kPa. The refrigerant is subcooled 10 degrees before entering the expansion valve and vapor is superheated 14 degrees before entering the compressor. A twin-cylinder compressor with stroke equal to 1.25 times the bore is to be used at a speed of 27 r/s. The volumetric efficiency is 84 per cent. Determine (a) the quantity of cooling water in the condenser for an 11-degree increase in temperature, (b) the bore and stroke, and (c) the compressor power. Ans. (a) 1.40 kg/s, (b) 8.58 x 10.73 cm, (c) 10.5 kW

(8) A refrigerant 12 refrigeration system requires a loada of 54 kW at an evaporator pressure of 270 kPa and a condenser pressure of 1009 kPa. The refrigerant is subcooled 10 degrees before entering the expansion valve and vapor is superheated 14 degrees before entering the compressor. A twin-cylinder compressor with stroke equal to 1.25 times the bore is to be used at a speed of 27 r/s. The volumetric efficiency is 84 per cent. Determine (a) the quantity of cooling water in the condenser for an 11-degree increase in temperature, (b) the bore and stroke, and (c) the compressor power. Ans. (a) 1.40 kg/s, (b) 8.58 x 10.73 cm, (c) 10.5 kW

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

A machinist was tasked to insert an aluminum piston into a steel cylinder. The inside diameters of the cylinder and of the piston are 0.500 m and 0.4998 m, respectively, at 25OC. To what temperature must they be heated to obtain a perfect fit?
Q2 (a) A sliding door rail as shown in Figure 2.1, is to be produced using steel as the raw material. If direct extrusion is to be used, at what temperature range (degree Celsius) and extrusion pressure range (MPa) the process should be carried out? Figure 2.1 A sliding door rail
How can you tell if a metal part is forged or cast. Describe the properties you would have investigated.
An aluminum oxide cutting tool will be produced. Would you produce it by casting? If you don't agree, please explain your reasoning and suggest a production method.
Explain what is the effective-slenderness ratio?
"Your boss requests a recommendation on which process to use to make fillet welds on stainless steel rail tank cars with this material. Your heart beating fast, you respond. " A: Use HYPERFILL®. The cooling rate is acceptable for this material and productivity gains are important given the large size of the product. B: "Use HYPERFILL®, for the same reasons as (A), BUT we need to change materials to a low carbon stainless steel (e.g. 304L) or we will get corrosion failure in the HAZ." C: "Use GMAW-P. For this material, this heat input is best. " D: "Use GMAW-P, for the same reasons as (C), but we need to change materials to a low carbon stainless steel (e.g. 304L) or we will get corrosion failure in the FZ."
Coupling will be used in the drive mechanism of the roles used in the Continuous Casting plant. The moment to be transmitted is high, the transmission distance is about 1500 mm, and there are fluctuations in the bending direction. Which type of coupling is best suited to absorb these fluctuations? Explain broadly the features of this coupling. Draw it schematically and explain the working principle.
Suggest three alternative materials that could be used to produce the desired wrench? Construct a comparison table to explain the advantages and disadvantages of each one? Cite appropriate references. Which of your alternative would you recommend to your supervisor?
Which of these factors causes more porosity to form toward the interior of a casting rather than toward the outside? (a) Gasses are less soluble in the solid metal than the liquid, so solidified areas push dissolved gasses toward the interior. (b) Casting under a vacuum causes gasses near the liquid metal surface to be drawn out of the liquid during solidification. (c) The feeding structures of the mold are designed to force entrapped air into the center of the casting. (d) Draft on the mold wall forces air bubbles toward the interior of the solidifying metal. (e) None of the above Non-eutectic alloys (most commercial alloys) solidify over a temperature range. Which of the following statements explains how this affects the casting process. (a) Solidified non-eutectic alloys are especially difficult to remove from metal dies (b) Non-eutectic alloys have significantly less fluidity than pure metals or eutectic alloys. (c) Non-eutectic alloys solidify starting from the outside of the…
Describe the die casting process in detail. Use neat sketches for clarity. Differentiate clearly between hot-chamber die casting and cold-chamber die casting processes. What is the difference between true centrifugal and semi-centrifugal casting? Describe the centrifugal casting process in detail. Use neat sketches to elaborate your description.
Use brief sentences, sketches or calculations to answer the following questions:
requirement : a good understandable handwriting and answer in step by step procedure with good arrangement