A cold store maintains storage air temperature of minus 23°C in an ambient temperature of 27"C. The plant has evaporating and condensing temperature of minus 30°C and 40°C and consumes 2kW of power. Assuming the refrigeration plant possess a Carnot efficiency of 50%, what is the cooling load of the store.

A cold store maintains storage air temperature of minus 23°C in an ambient temperature of 27"C. The plant has evaporating and condensing temperature of minus 30°C and 40°C and consumes 2kW of power. Assuming the refrigeration plant possess a Carnot efficiency of 50%, what is the cooling load of the store.

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

Chapter44: Geothermal Heat Pumps

Section: Chapter Questions

Problem 13RQ: If 14 gpm of water is flowing through an open-loop heat pump with a temperature difference of 7F,...

See similar textbooks

Similar questions

The function of the pressure tank in an open-loop, geo-thermal heat pump well system is to prevent the well pump from _____.
A R22 refrigeration system is used to operate between 45degC and -30degC. The total cooling capacity is 350 kW. a. What is the ideal COP of the system? b. What is the heat rejected by the system? c. What is the total power consumed by the system? There are several steps made to improve the performance of the system. What happens to the COP, heat rejected and power consumed by the system when: d. For the same evaporator and condenser pressure, the temperature at the entrance of the compressor is -20degC, and the inlet to the expansion valve is subcooled by 5degC. Due to the wide temperature gap, it is decided to use a two-stage refrigeration system using flash gas removal and optimal intercooling operation in a flash chamber. What happens to the COP, heat rejected and power consumed by the system when: e. Having a low pressure and high-pressure compression. f. Two evaporators and two compressors, with the lower temperature evaporator having a cooling capacity of 225 kW. Notes: The…
6. An auditorium is to be maintained at a temperature of 26°C & 50% RH, Air is to be supplied at a temperature not lower than 15°C. The sensible heat gain is llokw and the latent heat gain is 37.5 kw, Take venti- lating air as 25% by weight of the air from the room, and is at 35°C & 60% RH. Determine the refrigeration capacity in TR
Refrigerant 134a is used in a cooling system operating according to the ideal cooling cycle with vapor compression for cooling the cold storage in the milk processing plant. The flow rate of the refrigerant is 0.10 kg/s. The condenser and evaporator pressures are 1000 kPa and 600 kPa, respectively. a) Calculate the cooling capacity as (kW). b) Calculate the volumetric flow rate of the refrigerant at the compressor inlet. c) Calculate the efficiency coefficient of the cooling system.
A performance test of an ice plant gave the following data: Capacity: 20 tons of ice/day Refrigerant: Ammonia Condenser pressure: 1391.5 kPa Evaporator pressure: 208.26 kPa Raw water temperature: 32OC Harvest temperature: -7OC Block of ice: 300 lb/block The compressor is twin-cylinder, single acting, D/L = 1.25, 450 rpm, mechanical efficiency is 80%. Additional heat load due to infiltration and conduction is 20%. Determine: a) Number of cans needed b) Product cooling load c) Refrigerating capacity in tons of refrigeration d) Amount of refrigerant flow e) Size of motor to drive the compressor f) Bore diameter and length of stroke
A power plant was analysed based on Carnot cycle, the evaporator supplie 442 kJ of heat per cycle at 512°C and condenser cooling fluid was maintained at 36°C. (a).Determine the amount of heat rejected in the condenser? Provide answer to no decimal place and insert the unit symbol in kilo.... 1 °C is 273K in this question if required.
An air conditioning system is designed under the following conditions Outdoor conditions; 30°C dbt, 75% RH Required indoor conditions; 22°C dbt, 70% RH Amount of free air circulated; 3.33 m/sec Coil dew point temperature; 14°C The required condition is achieved first by cooling and dehumi dification and then by heating. Estimate (1) Capacity of cooling coil intons and its efficiency. (ii) Capacity of heating coil in kW. ii) Amount of water vapour removed kg/sec.
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. and
01. A refrigerant 22 system having a refrigerating capacity of 55 kW operates with an evaporating temperature of 5°C and rejects heat to water cooled condenser. The compressor is hermetically sealed. The condenser has a U value of 450 W/m².K and a heat-transfer area of 18 m? and receives a flow rate of cooling water of 3.2 kg/s at a temperature of 30°C. What is the condensing temperature?
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.
QUESTION 4 A manufacturer conducted an experiment for an evaporator capacity 500 kW cooling and designed for high COP of 2 when using lithium bromide plus water in an absorption refrigeration system. The evaporator operates 20 C, condenser 40 C & absorber 45 C supplying 1.4 kg/s of water plus lithium bromide solution to the generator. For a condenser size of 650 kW, determine: Ethalphy of the refrigerant entering the Evaporator in kJ/kg Answer in two decimal places QUESTION 5 A manufacturer conducted an experiment for an evaporator capacity 500 kW cooling and designed for high COP of 2 when using lithium bromide plus water in an absorption refrigeration system. The evaporator operates 20 C, condenser 40 C & absorber 45 C supplying 1.4 kg/s of water plus lithium bromide solution to the generator. For a condenser size of 650 kW, determine: Ethalphy of the refrigerant leaving the Evaporator in kJ/kg Answer in one decimal place(s)
QUESTION 4 A manufacturer conducted an experiment for an evaporator capacity 500 kW cooling and designed for high COP of 2 when using lithium bromide plus water in an absorption refrigeration system. The evaporator operates 20 C, condenser 40 C & absorber 45 C supplying 1.4 kg/s of water plus lithium bromide solution to the generator. For a condenser size of 650 kW, determine: Ethalphy of the refrigerant entering the Evaporator in kJ/kg Answer in two decimal places