|

VAPOR ABSORPTION REFRIGERATION QUESTIONS ANSWERS

VAPOR ABSORPTION REFRIGERATION  QUESTIONS ANSWERS   Vapor absorption system can operate without the use of electricity. The heat energy operates the system. Obtain heat  by burning of fuel or wood & solar energy. Use of solar energy makes it eco-friendly. It resembles very much with a vapor compression system. It uses different means of compression….

REFRIGERATION LAWS CLASS NOTES FOR MECHANICAL ENGINEERING

REFRIGERATION LAWS CLASS NOTES FOR MECHANICAL ENGINEERING Evaporator abstracts heat from the products/space to be cooled. Compressor adds energy to raise its temperature and pressure. This enabled the refrigerant to lose heat in the condenser equal to the sum of cooling effect and work input. High pressure helps the refrigerant to re-circulate. Re-circulation causes the cooling…

|

MATERIALS OF CONSTRUCTION AT CRYOGENIC TEMPERATURES

  MATERIALS OF CONSTRUCTION AT CRYOGENIC TEMPERATURES   All materials do not work satisfactorily at cryogenic temperatures. Properties undergo a tremendous change from room temperature down to cryogenic temperatures. Mechanical, electrical, thermal, and magnetic properties are most affected. At cryogenic temperatures, properties of concern include permeability, thermal conductivity, specific heat, linear thermal expansion, thermal expansion coefficient,…

|

MAGNETIC COOLING CLASS NOTES FOR ENGINEERING

Para MAGNETIC COOLING CLASS NOTES FOR ENGINEERING    Achieve cryogenic temperatures by magnetic cooling. It is achievable by demagnetization of a para magnetic salt. Magnetic cooling gives a temperature up to 0.001 K.   Magnetic Cooling Very Low temperatures of the order of 0.001 K are obtainable with magnetic cooling. Demagnetization of a para magnetic salt…

|

SENSIBLE HEAT FACTOR (SHF) CLASS NOTES FOR ENGINEERING

  SENSIBLE HEAT FACTOR (SHF) CLASS NOTES FOR ENGINEERING Sensible means due to temperature difference. Consider both sensible and latent heat loads in air conditioning.  Remove these in the same ratio in which added. Suitable sensible heat factor makes air conditioning enjoyable. There are many types of sensible heat factors. (a) ROOM SENSIBLE HEAT FACTOR…

|

COOLING LOAD CALCULATIONS CLASS NOTES FOR MECHANICAL ENGINEERING

COOLING LOAD CALCULATIONS CLASS NOTES FOR MECHANICAL ENGINEERING Cooling load calculations help to find the cooling capacity of a refrigeration plant for a certain application (cinema-library ). These cooling loads consist of sensible and latent heat loads. Sensible heat loads are due to temperature difference. Latent heat loads are due moisture difference. Some of cooling…

|

AIR CONDITIONER TYPES CLASS NOTES FOR ENGINEERING

AIR CONDITIONER TYPES  CLASS NOTES FOR ENGINEERING The air conditioning is an integral part of any home, office, restaurant, cinema and industry. Making the right selection is crucial. Comfort & energy consumption are interrelated. Different cooling requirements use different types of refrigeration units. Each has its own advantages and disadvantages. Domestic applications use window and…

| |

VAPOR COMPRESSION REFRIGERATION EQUIPMENTS

VAPOR COMPRESSION REFRIGERATION EQUIPMENTS  Equipments of vapor compression systems include compressors, condensers, evaporators & expansion valves. These also include piping and various controls. COMPRESSORS (i)  Reciprocating compressors: used with (a) lower boiling temperature (much below 00C) refrigerants (ii)  low specific volume at – 150C, (c) (pcond – –pevap) > 3.5 atm (  R-22, NH3, etc.)….

| |

SOLDERS & CLAENING AGENTS IN REFRIGERATION

  SOLDERS & CLAENING AGENTS IN REFRIGERATION Solders are used to connect copper tubes. Flux used make the soldering easy and defect less. Lead and paper gaskets are used to reduce the leakage of refrigerants. Petrol,  carbon tetra- chloride and dilute hydro-caloric acid are used for various cleaning purposes in refrigeration.  Solders used in Refrigeration and…

|

OPEN & HERMETICALLY SEALED UNITS

  https://www.mesubjects.net/wp-admin/post.php?post=5067&action=edit      Refrigeration equipment-2 https://www.mesubjects.net/wp-admin/post.php?post=5065&action=edit      Refrigeration equipment-1 https://www.mesubjects.net/wp-admin/post.php?post=4198&action=edit      MCQ Vapor Compression Refrigeration https://www.mesubjects.net/wp-admin/post.php?post=4194&action=edit       MCQ non-conventional refrigeration OPEN & HERMETICALLY SEALED UNITS Open units are used in large cooling requirements. In this, motor & compressor is connected by a belt drive. RPM of compressor & motor are different. Hermetically units are used in small cooling requirements….