Troubleshoot oil pressure problems in commercial refrigeration systems.
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HVAC Refrigeration
Refrigerators have become necessities in modern society. Most conventional refrigerators operate using a vapor compression cycle, a process which involves interaction between vapor and a ref…Full description
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Introduction
Industrial refrigeration plants operate with difference between evaporating and cond temperatures — 50° ~ 80° C Sign up to vote on this title
Opportunities: Multi-stage compression, Flas Useful Not useful intercooling, number of evaporators at d
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Introduction
A multi-pressure system is a refrigeration system has two or more low side pressures The low side pressure is the pressure of the refrig between the expansion valve and the intake of Sign up to vote on this title compressor Useful Not useful Different than the single pressure system which one low side pressure
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Removal of F lash Gas
Flash gas - the mass of vaporized refrigerant p total refrigerant which is just leaving the throttling Flash chamber/tank is that portion of the ex Sign up to vote on this title valve system where liquid-vapour Usefulmixture Not useful of ref gets accumulated before entering into the evapor You're Reading a Preview
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Removal of F lash Gas
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Removal of F lash Gas
The expansion process shown on the pressure en diagram takes place from 1 to 2 The state point as the expansion proceeds moves region of a greater fraction of vapour Sign up to vote on this title The end point of expansion, 2, could been a Useful have Not useful by interrupting the expansion at 3 and separating You're Reading a Preview
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Removal of F lash Gas •
•
Why not perform the part of expansion, separate from the vapour, continue expanding the liquid, an recompress the vapour without further expansion The equipment to achieve this separation is called Sign up to vote on this title tank Useful Not useful You're Reading a Preview
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Removal of F lash Gas
•
The expansion from 1 to 3 takes place through Sign up to vote on this title
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valve, which serves the further purpose of You're Reading a Preview
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Intercooling •
Intercooling between two stages of compression the work of compression per kg of vapour
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Intercooling
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M ulti pur pose Ref r iger ation Systems •
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Between the two given pressures, the work of
compression is proportional to the specific volum entering gas •
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Sp. Volume at 2 is greater than it is at4Notso work Useful useful for compressing fromYou're 2 to 3 is greater than in Reading a Preview
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Intercooling M ulti pur pose Ref r iger ation Systems
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Intercooling
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Intercooling
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H eat & M ass Balance Ar ound I nter coo
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H eat & M ass Balance Ar ound I nter coo
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One Evapor ator & One Compressor
With one compressor and one evaporator the flash tank may function as sh
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Two Evapor ators & One Compressor
In many situations one compressor serves two evaporators having diffe temperature requirements Following figure shows the system
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Two Evapor ators & One Compressor
A pressure reducing valve is installed after the high-temperature regulates the pressure and maintains a temperature in the airevaporator of 5 °C
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Two Compr essors And One Evaporato
Two stage compression with Intercooling and removal of flash gas is of way to serve one low-temperature evaporator The system requires less power than with a single compressor
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Two Compr essors And One Evaporato
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Two Compressors & Two Evapor ator
The system which has two evaporators ope different temperatures is common in refrigeration Example of dairy cooling milk & manufacturing Sign up evaporators to vote on this title Frozen food plant requires two at Useful Not useful temperatures Reading a Preview Evaporators at twoYou're different temperatures can
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Two Compressors & Two Evapor ator
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Pressur e Enthalpy Diagr am Solution:
Sketch the pressure-enthalpy diagram as shown
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Two Compressors & Two Evapor ator
The discharge pressure of the low-stage compressor and the suction pr high-stage compressor are the same as the pressure in the 5 °C evapor Next determine the enthalpies at the state points.
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Two Compressors & Two Evapor ator
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POWER PLANT ENGINEERING
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ICE PLANT AND COLD STORAGE
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Two Compressors & Two Evapor ator
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POWER PLANT ENGINEERING
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M ulti -Stage Systems a. Compound •
Two low compression ratios = 1 high
•
First stage compressor meets cooling load Sign up to vote on this title
•
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Second stage compressor meets load evaporator a You're Reading a Preview flash gas
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Cascade Ref r iger ati on Systems
Very low temperatures can be achieved by operating two or more vapor-co systems in series, called cascading .
Advantages: Different refrigerants, equipment, a be used for the higher and the lower systems. Al the system increases. Disadvantage: High first More Signcost; up to vote on thiscomplicated title
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Cascade Ref r iger ati on Systems
Consider a two-stage cascade refrigeration system operating between the limits of 0.8 and 0.14 MPa. Each stage operates on an ideal vapor compre with R 134a as the working fluid. Heat rejection from the lower cycle to the cycle takes place in an adiabatic counterflow heat exchanger where both s enter at about 0.32 MPa. If the mass flow rate of the refrigerant is 0.05kg/s determine Sign up to vote on this title (a) The mass flow rate of the refrigerant through theUseful lower Not useful cycle, (b) The rate of heat removal from the refrigerated space and the power inp You're Reading a Preview compressor, –
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M ulti stage Compression with F lash Cham I nter cooling (Compound System)
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M ulti stage Compression with F lash Cham I nter cooling (Compound System)
Interstage pressure is usually set so that the compression ratio at each sta the same for higher COPs. The optimum intermediate pressure is given by: Sign up to vote on this title
The optimum intermediate pressure in a two-stage refrigeration system is Useful Not useful but not equal, to that shown in above equation. The reason for the deviatio cooling process in air compressionYou're is without but in the refrigeration s Reading cost, a Preview
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POWER PLANT ENGINEERING
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M ulti stage Compression with F lash Cham I nter cooling (Compound System)
Consider a two-stage cascade refrigeration system operating between the limits of 0.8 and 0.14 MPa as before but, this time, with a flash chamber o 0.32 MPa. Determine (a) The fraction of the refrigerant that evaporates as it is throttled tothe fla Sign up to vote on this title chamber, Useful Not useful (b) The amount of heat removed from the refrigerated space and the comp You're Reading a Preview work per unit mass of refrigerant flowing through the condenser,
