A vapour compression refrigeration cycle operates ween the condensation temperature of 20°C and porator temperature of –10°C with carbon dioxide efrigerant Temperature after isentronic

b. A refrigerating system using Freon-12 has an evaporator saturation temperature of - 25°C and a condenser saturation temperature of 35°C. The vapor is dry saturated at entry to the compressor and has a temperature of 65°C after compression to the condenser pressure. There is no undercooling of the liquid in the condenser. i. Calculate the input power required by the compressor per kW of refrigeration. ii. Calculate the COPRef of the refrigerating system. ii. Show the operating cycle of the refrigerating system on a T-s diagram.

4. Ammonia enters the compressor of a refrigeration plant and is compressed from 190.2kPa, 98% dry to 972.2kPa with 50K of superheat. The refrigerant leaves the condenser as a liquid at 24°C and circulates with a mass flowrate of 5kg/min. Calculate: (a). compressor power (b). heat rejected in the condenser per minute (c). coefficient of performance (d). condition at entry to evaporator (e). plant capacity if enthalpy of fusion is 333kJ/kg Ans: 17.442kW, 6543kJ/min, 5.2522, 0.1536, 23.769tonne/day

2. A Refrigeration system using R-22 has a capacity of 320 kW of refrigeration. The evaporating temperature is -10°C and the condensing temperature is 40°C. Calculate the dryness fraction in the mixture before the evaporator. A. 0.287 B. 0.315 C. 0.245 D. 0.227

Question 2 of 4 - / 25 An office building requires a heat transfer rate of 30 kW to maintain theinsidetemperature at 21°Cwhen theoutsidetemperature is O°C. Avapor-compression heat pump with Refrigerant 134a astheworkingfluid isto beused to provide the necessary heating. The compressoroperates adiabatically with an isentropic efficiency of 82%. Determine appropriate evaporator and condenser pressures of a cyclefor this purpose assuming ATcond = ATevap = 10°C, as shown in the T-sdiagram. The refrigerantexitstheevaporator assaturated vapor and exitsthecondenser as saturated liquid at the respective pressures. AT cond Outside air 21°C 0°C Inside air ATent Condenser Evaporator Expansion valve Compressor Step 1 Determinethe mass flow rate of refrigerant, in kg/s. m = kg/s Attempts: unlimited Submit Answer Save for Later Using multiple attempts will impact your score. 5% score reduction after attempt 2 Step 2 The partsof thisquestion must becompleted in order. This partwill be availablewhen…

A. Describe the four processes, which occur in the vapor-compression-refrigeration cycle that youtested.B. How did you figure out the enthalpy at the various entry / exit stages? (I know you lookedat the chart or table provided! I understand that you may have used interpolation.) I want you toexplain briefly how you determined, what principle(s) you used to determine the enthalpy at thevarious points.Sketch a p-h diagram. On this sketch of the p-h diagram you must sketch and show SOME constanttemperature lines, constant pressure lines, constant enthalpy lines, constant entropy lines, quality factorand other significant features of the p-h diagram to show your understanding of the p-h diagram. Labelx & y axis, indicate the units, indicate the critical point. Label various regions,

I need the workings ASP the answers are there  questionn 4 4.  A boiler produces 6 tonnes/hour of steam at a pressure of 1.8 MPa and a temperature of 250ºC.Feedwater enters at a temperature of 39ºC. At exit from the economizer part of the boiler thetemperature is 72ºC. At exit from the evaporator part of the boiler the steam is 90 % dry.Energy is supplied by 650 kg of coal per hour, which has a calorific value of36 MJ/kg. The A/F ratio is 25 : 1. The temperature of the flue gas at entry to the economizerpart of the boiler is 430ºC. The average specific heat at constant pressure of the flue gas inthe economizer is 1045 J/kg.K.4.1 Calculate the efficiency of the boiler.      [70.5 %] this one is the answer 4.2 Draw up an energy balance, on a kJ/kg coal basis, with percentages of the total energysupplied.            [economizer 3.6 %, evaporator 59 %, superheater 8 %,other 29.4 %]

give answer all questions with explanation.

A reversible refrigerator operates using a Carnot refrigeration cycle. It operates usingr-134a between 140 and 400 kPa. The refrigerant exits the compressor (and enters the condenser) assaturated vapor. It also leaves the condenser as saturated liquid.a. Sketch the P-v and T-s diagram of this cycle. Define the coordinate properties of each state oneach graph.b. Evaluate the specific heat and specific work properties of each (in kJ/kg). Indicate the sense.c. Evaluate the coefficient of performance using the specific heats and works from the previousitem. Did it match with the COPR obtained if you used the operating temperatures?   Solve for states first. Then, show the solution to each of the above required in order.

The air outside is 40 C and 60% r.h. I want torun an air conditioner to cool it to 15 C. The deliver rate should be 1000 m^3/min. What is Q and the rate at which water condenses (if any)?