A plant using R134a refrigerant has a cooling capacity of 352 kW of refrigeration. It evaporates at 0 C and condenses at 35 C, with the 5 of superheat at the evaporator outlet and 5 K of sub-cooling at the condenser outlet. Assuming isentropic compression and ignoring pressure drops in the piping, the evaporator and condenser, determ the following; a) The refrigeration effect. b) The mass flow rate of refrigerant ) The compressor power d) The rate of heat.rejection at the condenser e) The COP ) The corresponding Carnot COP g) The percentage Carnot-efficiency

A plant using R134a refrigerant has a cooling capacity of 352 kW of refrigeration. It evaporates at 0 C and condenses at 35 C, with the 5 of superheat at the evaporator outlet and 5 K of sub-cooling at the condenser outlet. Assuming isentropic compression and ignoring pressure drops in the piping, the evaporator and condenser, determ the following; a) The refrigeration effect. b) The mass flow rate of refrigerant ) The compressor power d) The rate of heat.rejection at the condenser e) The COP ) The corresponding Carnot COP g) The percentage Carnot-efficiency

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

Chapter47: High-pressure, Low-pressure, And Absorption Chilled-water Systems

Section: Chapter Questions

Problem 13RQ: The subcooling temperature in a condenser can be measured by taking the difference between the A....

See similar textbooks

Similar questions

Four methods for controlling head pressure in an air-cooled condenser are ______, ______, _______, and
The most popular refrigerant used in the past for residential air-conditioning is R- ________.
Two methods used to power refrigeration compressors on a ship are _____and ____.
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 refrigerant 22 reciprocating compressor has a capacity of 5 tons with a condensing and evaporating temperature of 40 C and 10 C. The same system was used for heat pump application operating at 50 C condensing and 0 C evaporatingFIND ENTHALPIES, SPECIFIC VOLUME
Example: 100 TR refrigeration capacity of air condition plant using R134a has evaporating and condensing temperature of 0°C and 35°C respectively, the refrigerant enters with degree of super heat of 7°C. Find 1- Dryness fraction of the vapour entering the evaporato. 2- The mass flow rate of refrigerant, and 3- COP of the system
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)?
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 %]
What are chilled liquid treatment process and condenser water treatment process in refrigeration and air conditioning?
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…
1.) Determine the refrigerant name and chemical formula of R-22 2.) An ice plant produces 20 tons of ice per day at -15oC from water at 25 oC. If miscellaneous losses are 12 % of the freezing and chilling load, calculate the refrigeration capacity of the plant, in TR.
3.) 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