Room sat.liquid 50C Condenser Compressor stage 2 Valve R-134a 2 sat. vapor -200 Moing chamber Flash chamber Sat. liquid -20 c -w, Compressor stage 1 * valve Evaporator sat. vapor 40C Cold space
Q: PROBLEM 1: A 20-ton vapor compression refrigeration system is to evaporate R-12 at -20°C and to…
A: Solution: Given Data: Q=20 tons×3.52=70.4 kW N=10000 rpm×160=166.67 rpsc=0.05
Q: Choose the valid statement about ideal vapor compression refrigeration cycle Select one: O a. Heat…
A:
Q: Water cooled condenser is used for large capacity plant. O True False
A: Water cooled condensers are basically Heat exchangers which are used to remove heat from working…
Q: What are some ways to increase the COP of the vapour compression cycle?
A: Given Vapour compression cycle To find Methods to improve the COP
Q: Steam is supplied to a two-stage turbine at 48 bar and 400 °C. It expands in the first turbine until…
A: It is required to determine specific enthalpy at state 1
Q: an ammonia system supplies chilled brine for a 10 ton load at 0F, a 2 ton load at 20F, and 4 ton…
A:
Q: A two stage compressor using NH, is to operate with 54.74 kPa evaporative pressure, 384.26 kPa…
A: Two stage compression with water intercooler and flash intercooler It consist two compressors one is…
Q: PROBLEM 1 : An ammonia vapor refrigeration cycle operates at an evaporator temperature of -16 °C and…
A: Answer: The COP of the heat pump : (a) for an ideal saturation cycle: 5.4435. (b) for wet…
Q: PROBLEM 1 : A 50-ton vapor compression refrigeration system is to evaporate R-12 at -20°C and to…
A: “Since you have posted a question with multiple subparts, we will solve first three sub parts for…
Q: Avapor-compression heat pump has a heating capacity of 500 kl/min and uses Refrigerant 134a asthe…
A: Given data Heating capacity of heat pump= 500 kJ/min = 8.33333 kJ/sThe following are the various…
Q: Consider three ideal vapor compression cycles with three evaporators and one condenser. Connect the…
A: Option a is correct.
Q: Steam is supplied to a two-stage turbine at 48 bar and 400 °C. It expands in the first turbine until…
A: Given data as Pressure at the inlet to the 1st stage turbine (P1)=48 bar The temperature at the…
Q: What are the advantages and limitations of surface condensers over jet condensers?
A: The answer is
Q: EFFICIENCY DETERME THE MAXIMUM THERMAL OF D STEAM POIVERPLANT OPERATING ON THE SIMPLE RANKINE CreLE…
A: Given: A steam power plant working on a simple Rankine cycle. The condenser pressure is, P3=0.2…
Q: In a two stage compression with intercooling and flash gas removal design, the evaporator pressure…
A: The intermediate pressure: Pintermediate = 500 kPa
Q: The type of condenser that has the lowest operating head pressure is the ___________ cooled…
A: Given data : Lowest operating head pressure.
Q: A cascade refrigeration system serves a 75 ton evaporator at 119.4 KPa. The system uses direct…
A:
Q: on the
A: given: 8(Explain abou the heat transfer mechanism on the ljungstrom air preheater related into…
Q: A vapour compression refrigeration cycle operates ween the condensation temperature of 20°C and…
A:
Q: er. Data on the individual compone 30,600 W/K 26,500 W/K evaрorator condenser rofrigerntion canngity…
A: data provided D =240 mm k =0.6 w/m-kqgv= 24000 w/m3 it is isolated by Dr =440 mm k =6 w/m-kn =25…
Q: A cascade refrigeration system serves a 75 ton evaporator at 119.4 KPa. The system uses direct…
A:
Q: sat.liquid 50C Condenser Compressor stage 2 Valve R-134a 2 sat. vapor -20C Flash 3 Moing chamber…
A: Given Data and Initial Calculation :-
Q: A refrigerant 22 vapor compression system includes a liquid-to-suction heat exchanger in the system.…
A:
Q: I. Draw the h-s & T-s diagram of the system below CONSIDERING "WORK IN" AS PROCESS 1-2. 2 BOILER…
A:
Q: (a) Identify the effectiveness of a regenerator and demonstrate why the enthalpy value before the…
A: Solution:
Q: Systen capacities 20 TR, 30 TR and 10 TR with individual expansion valves and individual…
A:
Q: A) What are the requirements for a good boiler B) What are the requirements for an efficient steam…
A: Given questions: A) What are the requirements for a good boiler B) What are the requirements for an…
Q: A cascade refrigeration system serves a 75 ton evaporator at 119.4 KPa. The system uses direct…
A:
Q: oper vapor compression refrigeration cycle. The evaporator and condenser pressures are 200 kPa and…
A:
Q: QUESTION 2 Condenser Diagram 2E shows an ideal cascade vapour-compression refrigeration cycle using…
A: Given: m1˙=11160 kg/hour=3.1 kg/sP1=100 kPaP2=P3=280 kPaP6=P7=900 kPa To find 1. Coefficient of…
Q: Steam is supplied to a two-stage turbine at 48 bar and 400 °C. It expands in the first turbine until…
A:
Q: The type of condenser in which the steam and cooling water flow from top to bottom and mix is called…
A: Condenser is a mechanical device that exchanges heat and condenses the vapour into a liquid state by…
Q: Steam is supplied to a two-stage turbine at 48 bar and 400 °C. It expands in the first turbine until…
A: It is required to determine pressure at state 5
Q: Draw the schematic and p-h diagram for the problem below: A two-stage cascade refrigeration system…
A: According to the information we have a two-stage cascade refrigeration system that uses ammonia as…
Q: 3) What are the requirements for an efficient steam condenser 71
A:
Q: on 12 simple saturation cycle operates at temperatures of 35°C and 15°C for the condenser and…
A: enthalpy at 1h1=hg1@-15°C =345.855 kj/kgs1=sg1@-15°c =1.56685 kj/kg k
Q: QUESTION 54 An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its…
A:
Q: Condenser Compressor stage 2 Q2- Find the coefficient of performance for the fallowing cycle and…
A: Using R-134aAT -40°C saturated Pevap=51.25 kPah8=hg=225.86kJ/kgs8=sg=0.96866 kJ/kgKPoint 9 lies on…
Q: Discuss the advantages of using multi-stage refrigeration cycle
A: Given; A multi stage refrigeration cycle is a system with two or more low side pressure where low…
Q: PROBLEM : IN A CERTAIN REFGN. SYS. FOR LOW TEMP. APPLICATION, A TWO - STAGE OPERATION IS DESIRABLE…
A:
Q: QUESTION 7 What pumps take their suction from the Condenser Hotwell and drive condensed turbine…
A: The pump which drives water from hotweel to feedwater system.
Q: A 50-ton vapor compression refrigeration system is to evaporate R-12 at -20°C and to condense it at…
A: Vapour-compression refrigeration or fume pressure refrigeration framework (VCRS),[1] in which the…
Q: Steam is supplied to a two-stage turbine at 48 bar and 400 °C. It expands in the first turbine until…
A:
Q: Beiler Py000 P "punpin' Pumpl Turbine Condenser Figure 2 (b) Determine the themal efficiency of the…
A: given; at turbine inlet pressure P2=P3=6000KPa and temperature T=6000csuperheated…
Q: Steam is supplied to a two-stage turbine at 48 bar and 400 °C. It expands in the first turbine until…
A: It is required to determine specific enthalpy at state 3
Step by step
Solved in 2 steps with 2 images
- Exampie Air conditioning unit uses Freon R-22 for conditioned office at 25 C. The evaporating temperature is 17 C and the condensing temperature is 47 C. The compressor is reciprocating and single acting with number of cylinders of 4, volumetric efficiency of 0.9, number of revolution is 900 rpm cylinder dimensions of L/D is 1.25. If the compressor power is 3 kW and mechanical efficiency of 0.9, estimate the followings: the refrigerant mass flow rate in kg/min, refrigeration capacity in TR, cylinder dimensions, condenser heat load, coefficient of performance and relative efficiency. andQ4//A// Prove for the condenser: + %3D Cpw (Twz-Tw1) when the temperature of cooling water outlet and inlet is equal to saturation temperature of steam and the condensate leaving the condenser respectively; also, the inlet of condenser is dry steam with unity latent heat. m, TwiCondenser 30 c „Flash Chamber Pi Evaporator OC & 50 kW For a 2-stage ammonia compression system, determine: 1. Draw the PH diagram showing the condenser, evaporator, & compressor discharge temps, intercooler pressure, all enthalpies & compressor suction specific volumes, m/kg 2. Compute the intercooler pressure in Bars & equivalent Ti in °C 3. Compressor discharge temps T: & T4 4. Mass of refrigerants m:, ms & m: in kg/sec 5. Compressor power Wi, W & total W- in kW & HP 6. Compressors PD with equal volumetric efficiency 80%; m/s 7. Condenser capacity, kW 8. Using a single stage compression, calculate & compare the power of the compressor/s in kW & HP
- (b) Determine the cooling load (q₁), heat rejection (q) and actual compressor work input (w) per unit mass in kJ/kg. . C. (c) Calculate the coefficient of performance (COP) of this actual refrigeration cycle and compare it with the COP of a reversed Carnot cycle for refrigeration if used under the same inside and outside amblent temperatures.Chete The cycle astarts with state A with velume V3 to state B with Vi- Then at Gd of Comptesion, fuel sfrayed on chol iGnital o deulting in ch C3obabic exponsion to state C with velume Va flbuwel by dliabatic exbonsion back to Velume V3(sHt DJ- Thens finely exheset exbelled o Cole bonding to on isochoric deduction of presuse chich Comfleter diesel cycle with warking sube tance Coair). abliabatic com resion of ac't from is d eycle ohol takes dio back to A state- d). Doelw dizel cyck? on exbdesron So heat absotbel by aix chen fuel is ianitel . Q2, whn exhaut is expellel in tem of tede? Give ais ohd Get expelled C). Find batio of T initial ond Teinal fat adiabete Compteion ond exbonsion ?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…
- What should be the percent increase of COPof a standard vapor compression refrigerationsystem when expansion of R-12 is isentropicinstead of isenthalpic process? Evaporator andcondenser temperature limits are -10°C and30°C respectively.A steam condenser receives 10 kg per second of steam with an enthalpy of 2570 KJ/kg. Steam condenses into liquid and leaves with an enthalpy of 160 KJ/kg, if cooling water passes through the condenser with temperature increases from 13oC to 24oC. Calculate the cooling water flow rate in kg/sec. pls dont skip anything show all solution including conversion of units3.) An ammonia compressor operates at evaporator pressure of 316.02 kPa and a condenser pressure of 1557 kPa. A twin-cylinder compressor with bore to stroke ratio of 0.85 is to used at 1200 rpm. The actual volumetric efficiency is 92% and compression and mechanical efficiency is 78% and 80% respectively. For a cooling capacity of 25 TR, (a) the sketch the p-h diagram labeling the evaporating and condensing temperature and pressures (b) define the all properties of ammonia taken from saturation table. Determine (c) the quantity of cooling water in the condenser in kg/min if the increase in temperature is 8°C, (d) the bore and stroke expressed in cm and (e) the size of the driving motor in hp. Given: h2 = h at 1557 kPa and s2 = s1 1695 kJ/kg
- 8.3 A four-effect evaporator is being considered for concentratinga fruit juice that has no appreciable boiling-point elevation.Steam is available at 143.27 kPa, and the boiling point ofthe product in the fourth effect is 45°C. The overall heat-transfer coeffi cients are 3000 W/(m 2 °C) in the fi rst effect,2500W/(m2 °C) in the second effect, 2100W/(m2°C) in thethird effect, and 1800W/(m2°C) in the fourth effect. Calculatethe boiling-point temperatures of the product in the fi rst,second, and third effects. Assume the heating areas in all theeffects are equal to 50m2 each. The mass fl ow rate of steam tothe fi rst effect is 2400kg/h, the feed rate to the fi rst effect of 5%total solids fl uid is 15,000kg/h, the concentrated product fromthe fi rst effect leaves at 6.25% total solids, and the concentrationof product leaving the second effect is 8.82% total solids. Make it in the form of a spreadsheet for solving the example problem no. 8.2 and 8.3Homework-2 Compute the themal e fficiency of an ideal Ran kine cycle for which the steam leavea the boiler as Saturated Vapor at 30 bars. The turbine-outlet Conditions is Be1 bar. Determine the mass floo rate of the steam in kg/hr, net Power output of the cycle is 50000 Sehematic ond given data are: 1f the kw. The TI= 5002 P 3०bars %3D 9in (saturated) vapour 30 bars 2 PR =0-1 bar 4 Pa=30 bas o-1 bar +4 Tout 3 (Saturated liquid) Wp ( Simple Ideal Power cycle) (T.S. diagram e)A manufacturing company is intending to use its water cooled condenser for itsproposed cold storage room. The name plate of the condenser gives the followingspecifications:refrigerant ammoniacondenser water inlet 30 OCcondenser water outlet 40 OCcondensing temperature 35 OCrefrigerant flow 3.84 kg/mincirculating water flow 120 kg/minIf the company decided to purchase a new compressor and evaporator, find the tonnageof the system and the temperature in the evaporator, (b) what is the COP? (c) find thetheoretical hp required.