One TR

One ton of refrigeration is defined as the refrigerating effect that freezes One ton of liquid water(2000 lbs) during 24 hrs. Water and ice Are both on 0 degree C. 2000 lbs=2000/2205=907 kg Enthalpy of fusion of water at 0 degree=333.43 kJ/kg 1 ton of refrigeration= 907x333.43/24x60=210kJ/min = 3.5kJ/sec=3.5kw

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Dear students I have posted revision points key go through before sleep. Good luck and good night 

SC Malhotra

1.Lathe machine...fig, parts, operations difference between shaper and planer, operation of milling. 2.NC and CNC complete 3.laws of thermodynamics, Zeroth law 4.Heat pump, heat engine and refrigerator 5.what is entropy, enthalpy(total heat) 6.Properties of steam, Calorimeters, Mollier chart and steam table 7.Rating of Refrigeration I.e. TR, COP, simple refrigeration vapour compression cycle. 8.psychometric chart, human comforts 9.Classification of turbines their brief description, pumps and clutches 10.Power transmission by belt, rope, chain and gear velocity ratio and mechanical advantage And power transmitted by belt 11 All types of stresses, strain as in blog, hook's law, poisson's ratio, elastic constants, Their relationship. Modulus of elasticity,rigidity, bulk modulus, lateral &leaner strain etc 12.Stress-strain diagram digm and description of each points A, B, C, D, E and F,

Exam eve

Dear students are u studying? Ok see the blog in between.

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Dear students Psychometric chart it is a graphically representation, which gives mainly humidity percentages for designing refrigeration and air-conditioning units. It gives the values of vapour pressure, enthalpy, sensible heat specific humidity specific volume depending on dry bulb temperature& wet bulb temperature. Draw rough chart to explain. Mollier chart it is a graphical representation of steam table I.e. The values of steam table are plotted. Specific entropy is on ordinate (X axis) and specific enthalpy on Y axis(abscissa). A Mollier chart has following lines. Dryness fraction lines Constant specific lines Constant pressure lines Constant temperature lines. I will be typing pl go through before sleep. Best of luck.