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- Evaporative cooling PLEASE DO NOT USE PSYCHROMETRIC CHART. THANK YOU In the diagram below inlet air is drawn over a pool of liquid water in a steady-state, steady-flow isobaric process. Evaporation on the pool resultsin saturated air at the exit. The pool of liquid water is assumed to be at the same temperature as the exitair. Discharge fans at the exit provide a volumetric flow rate of 800,000 ft3/min. In the diagram above inlet air is drawn over a pool of liquid water in a steady-state, steady-flow isobaric process. Evaporation on the pool resultsin saturated air at the exit. The pool of liquid water is assumed to be at the same temperature as the exitair. Discharge fans at the exit provide a volumetric flow rate of 800,000 ft^3/min. Problem #1: Assume that the exit temperature is T2 = 90 °F. For this model of the system and from thedata provided determine:a) The mass flow rate dry air through the system (lbm/sec).b) The rate of heat that is output from the R-134a condenser Qout…What is the ideal mass flow rate for a refrigeration and cryogenic plant for oxygen production? Show solution if necessary and reference.Condenser 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
- PLEASE DO NOT USE PSYCHROMETRIC CHART. THANK YOU In the diagram below inlet air is drawn over a pool of liquid water in a steady-state, steady-flow isobaric process. Evaporation on the pool resultsin saturated air at the exit. The pool of liquid water is assumed to be at the same temperature as the exitair. Discharge fans at the exit provide a volumetric flow rate of 800,000 ft3/min. Problem #2: Assume that the R134a chiller is turned off such that Qout = 0, but the evaporative coolersystem continues to operate. Determine:a) The exit temperature, T2 (°F)b) The mass flow rate dry air through the system (lbm/sec).c) The rate of liquid water resupply required for continuous operation (lbm/hour).QUESTION 12 Determine the type of steam, given: Pressure: 60kPa Interal Energy: 360 kl/kg Saturated Liquid O Saturated Vapor O Superheated Vapor O Wet Vapor3.) 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
- 2. Explain how to increase the coefficient of performance of a single stage vapour compression system. Illustrate your analysis through charts (P-h and T-s diagrams)104#1. an ideal gas with R=0.062 BTU/lbm-degree R and Cv=0.158 BTU/lbm-degree R undergoes athree process cycle in a cklose system. from the initial state of 20 psia and 570degree R, the gas is compressed at coinstant pressure to 1/5 of its initial volume, process 1-2; it is then heated isochrocally to state 3, process 2-3; and finally, it expands polytopically with index n=1.5 back to its initial state, process 3-1. determine the pressure, specific volumes and temperatures at cardinal points around the cycle and the cycle thermal efficiency.E 01 Image Word 1/1 Using PV & TS Diagrams derive the formulae of a. Temperature, Pressure & Volume c. Change of Enthalpy e. Change of Entropy g. Work steady-flow of the following processes; 1. Isopiestic, 2. Isochoric, 3. Isothermal, 4. Adiabatic, 5.General Polytropic b. Heat addedrejected d. Change of Internal Energy f. Work non-flow Tap to view in full-screen OCR Rotate Markup Extract Text Signature Note
- Exercise We consider an ideal Diesel Cycle whose compression ration The heat transfer to the motor fluid from 18 = Vmin At the start of and the temperature is 15°C~ We the neglect which is assimilated Compression the air pressure Ft to the Narvation of composition of the contents in moles of a perfect = 1.80 MJ.xg diatomic gas (Ideal gos) of mass Determine the pressures Pa as well as the temperatures T2, T3, Tp. WEEng Nmin is 1.00 bar Express temper T₁, T₂, T3, Ty and d. Numerical Application (M = 29 g mul~) Comment on 1-2 reversible adiabatic compression (isentropic) 2 +3 fuel Injection and Combustion 34 reversible adiabatic expansion (isen tropic) Cooling of perfect l' deal) gases. Isochoric erature of this cycle as a function of Imax M = 2.M Please answer the above question step-wise, showing explanations, Including diagrams where nee Decessary. Thanks in adland 3 PA 3 Y 21 Vmin JA Imax PV(17 blanks) Calculate the efficiency of the Carnot Engine for ideal gas. Consider the figure below for a complete cycle of Carnot engine, where the cycle goes from ad->ab->bc->cd Carnot cycle Он TH Tc - V 02016 Pearson Education, Inc. processes: processes and segment ab & cd are the Where segments ad & bc are the and the volumes involved are Va, Vb, Vc, Vd, and the two temperatures TC and4. What is the function of evaporator in simple vapour compression system?