Vapor Compression Refrigeration System A refrigerating machine using R-12 as refrigerant operates between the pressures 2.5 bar and 9.0 bar. The compression is isentropic and there is not under cooling in the condenser. The vapour is dry and saturated condition at the beginning of the compression. Estimate the theoretical COP. If the actual COP is 0.65 of theoretical COP, calculate the net cooling produced per hour. The refrigerant flow is 5 Kg/min. The properties of refrigerant are : Pressure Satu. temp. (Bar) 9.0 Enthalpy (kJ/kg) Liquid 70.55 Entropy (kJ/kg K) Vapour (°C) Vapour 36 201.8 0.6836 2.5 -7 29.62 Take specific heat of superheated vapour at 9 bar as 0.64 kJ/kg K. 184.5 0.7001 Compressor pressure = 9 bar Evaporator pressure = 2.5 bar COND COND 2' 36°C 36°C COMP EVAPO EVAPO -7°C -7°C h4 Professor Dr. Mohammad Zoynal ABEDIN Dept. of ME, DUET, Gazipur MCE 4391 Department of EEE IUT, Board Bazar, Gazipur Basic Mechanical Engineering EXPN COMP 2.

An electric hot water heater consumes 3.1 kilowatts of electricity and converts it to heat. How long will it take the water heater to heat a 67 gallon tank of water from 10 degrees Celsius to 50 degrees Celsius? (1 kilogram of water is 0.37 gallons, 1 Calorie = 4200 J).  It may be helpful to refer back to the weekly handout for guidance on this problem. Your final answer should be in minutes (rounded to the nearest 10 minutes).

(Thermodynamics) Plz solve the question and show the steps

You need to find out the maximum NPV of a hypothetical iron ore open pit as shown below. The iron ore grade is 72% and recovery is 90%. The market price of iron ore is $100/ton. The ore and waste block size are 30 by 30 by 30 m3 and annul production of six blocks (mining + stripping) is there. The mining cost is $35/ton and the stripping cost is $25/ton. The density for the ore and waste is 4.5 ton/m3 and 2.5 ton/m3 respectively. Assuming initial investment $50 million the interest rate is 5% per year.

1. The development of thermodynamics since the 17th century, which was pioneered by the invention of the steam engine in England, and was followed by thermodynamic scientists such as Willian Rankine, Rudolph Clausius, and Lord Kelvin in the 19th century. explain what the findings or theories of the 3 inventors are! Please answer fast max 25-30.minutes thank u

Hello. Can you please help answer the question shown in the photo? It is a 3-part question which I have attempted many times. I was able to calculate the correct answer for part 2, but part 1 and part 3 still says I am incorrect. Please show how to properly solve the problem. The topic is heat transfer. Thank you.