ENERGY EFFICIENCY RATIO, COEFFICIENT OF PERFORMANCE & SEASONAL ENERGY EFFICIENCY RATIO

ENERGY EFFICIENCY RATIO, COEFFICIENT OF PERFORMANCE & SEASONAL ENERGY EFFICIENCY RATIO   The Energy Efficiency Ratio (EER) is the ratio of output cooling in Btu/h to energy input in watts. It is at a given single outside temperature. EER = cooling in (BTU /h)/ energy input in watts Calculate EER  at 950F outside temperature. The…

CLERANCE VOLUMETRIC EFFICIENCY

https://www.mesubjects.net/wp-admin/post.php?post=7801&action=edit     Centri and Axial compressors https://www.mesubjects.net/wp-admin/post.php?post=7773&action=edit      Recip and rotary Compressors https://www.mesubjects.net/wp-admin/post.php?post=7649&action=edit      Air compressors https://www.mesubjects.net/wp-admin/post.php?post=7344&action=edit       Fill Blanks-compressor https://www.mesubjects.net/wp-admin/post.php?post=6740&action=edit      Refri Reciprocating compressors CLERANCE VOLUMETRIC EFFICIENCY Clearance is a must in a compressor. It does not allow the piston to  strike the cylinder head. Clearance does not permit to such full amount of gas. Exhaust gases left in…

REFRIGERATION CHARTS AND TABLES CLASS NOTES

REFRIGERATION CHARTS AND TABLES CLASS NOTES     Working substance in refrigeration is vapor.  Gas laws do not apply to vapors. Vapors have complicated equations of state. These are laborious for analysis. Hence charts and tables are in use. Martin- How Equation Of State                    P =RT/…

SIMPLE VAPOR COMPRESSION REFRIGERATION CYCLE

SIMPLE VAPOR COMPRESSION REFRIGERATION CYCLE There are four main processes in a vapor compression refrigeration cycle. (i) Compression (ii) Condensation (iii) Expansion (iv) Evaporation It is most commonly used & the oldest refrigeration cycle. It is a single stage refrigeration cycle. REFRIGERATION CYCLE SEQUENCE Clockwise sequence of components is compressor,  condenser,  expansion valve, evaporator and…

REFRIGERATION HISTORY & BASICS CLASS NOTES

REFRIGERATION HISTORY & BASICS CLASS NOTES Refrigeration is lowering of temperature. Conventional & non-conventional methods are in use.  Use Silica gel in the drier cum filter to remove any moisture and impurities. Use steel pipes with ammonia. Use copper pipes with halogenated hydrocarbon refrigerants. Use dry evaporators & air cooled condensers   in small capacity…

DATUM LEVEL IN REFRIGERATION

DATUM LEVEL IN REFRIGERATION ASSUMED DATUM LEVEL FOR VARIOUS VAPOR REFRIGERANTS FPS units(–400 F) mks units( 00 C) SI units (-400 C)    hl=0 sl=0   hl=100 k cal/kg sl=1.0 k cal/kg 0 C   hl=0 sl=0 Where hl is enthalpy of liquid and sl is entropy of liquid respectively. FOR WATER, ASSUMED DATUM LEVEL  IN SI…

SYMBOLS-REFRIGERATION AND AIR CONDITIONING

SYMBOLS-REFRIGERATION AND AIR CONDITIONING Symbols in refrigeration make the study simpler and easy. Standard symbols saves lot of time too. These help to increase the understanding deep and clear. A Area m 2 C Concentration of Low boiling component No units D Diameter m G Mass flux is Rate of mass flow per unit area Kg/s…

REFRIGERANTS CLASS NOTES FOR MECHANICAL ENGINEERING

REFRIGERANTS CLASS NOTES FOR MECHANICAL ENGINEERING   Refrigerant causes cooling in a refrigeration system. It flows in the refrigeration system like blood circulates in the human body. There are different refrigerants for different applications. For making their study and use simple, there is a nomenclature and numbering of refrigerants. It has to have desirable properties…