A two-stage cascade refrigeration system uses refrigerant-134a as the working fluid and operates between 1.2 MPa and 200 kPa. Each stage operates on an ideal vapour compression refrigeration cycle. Heat rejection from the bottoming cycle to the topping cycle takes place in an adiabatic heat exchanger where it is assumed that both streams enter at 600 kPa. The mass flow rate of the refrigerant through the bottoming cycle is 0.15 kg/s. (a) Draw a labelled schematic of the system and a T-s diagram to describe the cycle (b) Determine the mass flow rate of refrigerant through the topping cycle (c) Determine the rate of heat removal from the refrigerated space (d) Determine the total power input to the compressors (e) Determine the coefficient of performance of the cascade refrigeration system

A two-stage cascade refrigeration system uses refrigerant-134a as the working fluid and operates between 1.2 MPa and 200 kPa. Each stage operates on an ideal vapour compression refrigeration cycle. Heat rejection from the bottoming cycle to the topping cycle takes place in an adiabatic heat exchanger where it is assumed that both streams enter at 600 kPa. The mass flow rate of the refrigerant through the bottoming cycle is 0.15 kg/s. (a) Draw a labelled schematic of the system and a T-s diagram to describe the cycle (b) Determine the mass flow rate of refrigerant through the topping cycle (c) Determine the rate of heat removal from the refrigerated space (d) Determine the total power input to the compressors (e) Determine the coefficient of performance of the cascade refrigeration system

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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7. Clarify the most important characteristics of an ideal refrigerant
PART A ONLY ( USE IMAGE BELOW) In a standard ideal refrigeration cycle (Fig. 1), the refrigerant 134a enters adiabatically isolated expansion valve as a saturated liquid at a pressure P1 = 1 MPa and leaves the device at a pressure P2 = 100kPa. Then the refrigerant enters the evaporator, where it changes into the saturated vapor. Subsequently, the vapor is compressed in an isentropic compressor to the pressure 1MPa and condensed in the condenser back to the initial saturated-liquid state. PART A - Determine the heat qL absorbed by the refrigerant in the evaporator and the compressor work win (per 1 kg of the refrigerant).
ervi n.k2603@sadiq.edu.iq SwMO Aslacel Asiacell jjs 0701 The name and photo associated with your Google account will be recorded when you upload files and submit this form. Your email is not part of 070E your response. Required Untitled Question * Q1: Refrigerant-134a is the working fluid in an ideal compression refrigeration cycle. The refrigerant leaves the evaporator -20°C and has a condenser pressure of 0.9 MPa. The mass flow rate is 3 kg/min. Find COP, COPR Carnot for same Tma and Tmin , and the tons of refrigeration. 1 Add file Untitled Question * Q2: A simple VCRC using R-134a operates with a condensing temperature of 30°c and an evaporating temperature of -20°c .The system produces 50 kw of refrigeration. Determine the : a) Thermodynamic property values at the four main state points of the cycle, b) COP, c) Rate of refrigerant flow. 1 Add file Submit Clear form This form was created inside of tmam Ja'afar Al-Sadia وأثق السلأمي 11:41p äc lull 22.04.02
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For the NH3/H2O cycle the following relationship give the solution flow rate per unit refrigeration rate: WFS_A * X - WFS_G(X-1) = 1 where WFS_A = mass fraction of NH3 in solution form the absorber WFS_G = mass fraction of NH3 in solution from the generator X-1 =mass of solution from the generator per unit mass of refrigerant flow For large systems, a reasonable pressure drop between the evaporator and absorber is 1.5 psi Consider a large NH3/H2O plant operating per the schematic below: Known/given: i. Refrigeration load = 500 tons ii. Evaporator temperature (state point 10) = 41.1 F iii. Evaporator pressure (state point 10) = 75 psia iv. Absorber pressure (state point 11) = 73.5 psia (per rule of thumb above regarding pressure drop between the evaporator and absorber) v. Strong aqua solution temperature (state point 3) = 105 F vi. Condenser temperature (state point 8) = 100 F vii. Condenser and tower pressure (state point 7) = 211.9 psia viii. Concentration split, WFS_G - WFS_A =6%…
With reference to the Vapour Compression Refrigeration Cycle which is used as the basis for the Refrigeration systems predominantly used in the Refrigeration and Air Conditioning Industry. 1) Describe and explain the 'Theory of Operation' of the basic refrigeration cycle. (Your description should include the function of each component that is part of the cycle) 2) State and discuss at least 3 Applications where refrigeration systems are used.
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Please only answer question 4 Parts C and D
For the NH3/H2O cycle the following relationship give the solution flow rate per unit refrigeration rate: WFS_A * X - WFS_G(X-1) = 1 whereWFS_A = mass fraction of NH3 in solution form the absorberWFS_G = mass fraction of NH3 in solution from the generator X-1 =mass of solution from the generator per unit mass of refrigerant flowFor large systems, a reasonable pressure drop between the evaporator and absorber is 1.5 psiConsider a large NH3/H2O plant operating per the schematic below: Known/given:i. Refrigeration load = 500 tonsii. Evaporator temperature (state point 10) = 41.1 Fiii. Evaporator pressure (state point 10) = 75 psiaiv. Absorber pressure (state point 11) = 73.5 psia (per rule of thumb above regarding pressure drop between the evaporator and absorber)v. Strong aqua solution temperature (state point 3) = 105 Fvi. Condenser temperature (state point 8) = 100 Fvii. Condenser and tower pressure (state point 7) = 211.9 psiaviii. Concentration split, WFS_G - WFS_A =6% by weight…
Fourth task:During a visit to a factory, I came across a compressor and a compressed air networkUsed to operate a number of compressed air systems. The following notes were collected:• The compressor is relatively old.• The compressor room was very hot.• The compressor room was relatively close to the compressed air systems• The pressure at the outlet of the compressor was 8 bar.• The pressure in the pneumatic systems reached 7.5 bar.• Compressor on/off cycles every 40-55 seconds.Prepare a short, high-level recommendation note about actions that can be taken immediately, and measurements you might plan to assess potential energy savings opportunities.