Q2: Two stage vapour compression refrigeration system with water intercooler uses R-22 as shown in figure 2 below. The evaporating temperature is -40 °C and condensing temperature 40 °C. The refrigeration capacity is 10 TR and the compression is adiabatic reversible process. The refrigerant leaves the water intercooler at 10 °C. Draw the cycle on p-h diagram and determine:- 1- The refrigerant mass flow rate. 2- Work done of each compressor. **3- Condenser heat load. >4- Coefficient of performance. 63034

Q2: Two stage vapour compression refrigeration system with water intercooler uses R-22 as shown in figure 2 below. The evaporating temperature is -40 °C and condensing temperature 40 °C. The refrigeration capacity is 10 TR and the compression is adiabatic reversible process. The refrigerant leaves the water intercooler at 10 °C. Draw the cycle on p-h diagram and determine:- 1- The refrigerant mass flow rate. 2- Work done of each compressor. **3- Condenser heat load. >4- Coefficient of performance. 63034

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter22: Condensers

Section: Chapter Questions

Problem 8RQ: Four methods for controlling head pressure in an air-cooled condenser are ______, ______, _______,...

See similar textbooks

Similar questions

Condensers in these refrigerators are all_______cooled.
In a 14 TR ammonia refrigeration plant, the condensing temperature is 250C and evaporating temperature -100C. The refrigerant ammonia is sub-cooled by 5 OC before passing through the throttle valve. The vapor leaving the evaporator is 0.97 dry. Find: 1. Coefficient of performance: and 2. Power required.
Example 2: Refrigerant R-134a enter the compressor of a has a refrigerantor a superheared vapor at 0.14MPa and -10°C at arate of 0.05kg/sec and leave at 0.8Mp and 50°C.The refrigerant cooled in the condenser to 26°C and 0.72Mpa is throttled to 0.15MPa.Disregradingany heat transfere and pressure drop in the connecting line between the components. Determine: a) The rate of heat removed from the refrigerated space b) The power input to the compressor. c) Isentropic eff of the compressor d) COP of the refrigerantor.
In a 14 TR ammonia refrigeration plant, the condensing temperature is 250C and evaporating temperature -100C. The refrigerant ammonia is sub-cooled by 5 0C before passing through the throttle valve. The vapor leaving the evaporator is 0.97 dry. Find: 1. Coefficient of performance: and 2. Power required. Use refrigerant table for properties of ammonia at 250C and -100C.
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.
100 ton of vapor compression refrigeration system using R-134a the vapor entering the evaporator at 2 bar and entering the condenser at 10 bar, the pressure drops in suction valve and discharge valve equal to 0.25 bar and 1.0 bar respectively. assume the refrigerant leaving the evaporator and condenser at saturated line find: (1) Refrigeration Effect (2) Power required in compressor (3) Actual COP of the cycle (4) Ideal COP of the cycle
In a R-134a based refrigeration system the cycle operates in the temperature range of 40°c and - 20°c. Find COP of the system if the vapor is dry and saturated .hile entering the compressor. Assume mass flow rate of refrigerant is 1 kg/s.
5. A vapour compression refrigeration plant using R12 has saturation temperatures in the evaporator and condenser of -20°C and 35°C respectively. The R12 leaving the condenser is undercooled by 5°C and leaving the evaporator it is superheated by 15°C. The R12 circulates at 10kg/m. Calculate: (a). the dryness fraction of the R12 at the evaporator inlet (b). the cooling load in kW (c). the rate of work done on the R12 in the compressor (d). the plant capacity
In a system one evaporator is to provide 180 kW of refrigeration at -30C and another evaporator is to provide 200 kW at 5C. the condenser temperature is 40C. The system uses 2 – stage compression with intercooling and is arranged as in figure. Calculate the power required by the compressors.
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.
3.5 An ammonia refrigeration system operates between saturated suction temperature of -20°C, and saturated discharge temperature of +40°C. Com- pare the COP of the cycle using wet compression with that of the cycle using dry compression. Assume that the vapour leaving the compressor is saturated in the case of wet compression, and the vapour entering the compressor is saturated in the case of dry compression. The refrigerant leaves the condenser as saturated liquid.
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…