Mindblown: a blog about philosophy.

This type of refrigerator takes advantage of the fact that the liquid ammonia evaporators very rapidly in hydrogen. For this refrigerator, no pump is required as the circulation is maintained by gravity and the heat is supplied by a small gas jet or electric heater. Figure 36.36 shows a diagrammatic view of Electrolux refrigerating system.…

In this engine the cycle is completed in two strokes of the piston or one revolution of the crankshaft (in four stroke engine crank rotates through two revolution in one cycle). (a) Ports: This engine has no valves but there are three ports inlet, exhaust and transfer ports as shown. These ports get opened and…

Convection heat transfer is defined as the transfer of heat through the agency of particles of fluid which receive heat from a high temperature source and move to the locality of a lower temperature sink to reject heat. The sink may be some body exposed to the fluid, or it may be cooler particles of…

We have repeatedly used the term heat (Q) and heat exchanges between bodies without discussing the details of the phenomena by which heat is transferred. Heat transfer is a name of general process applied to any device that effects a transfer of heat from one substance to another. The various devices that employ the principles…

Consider one kg of water at 0°C. Also let us decide upon the pressure under which one kg of water is to be heated. Consider a cylinder with a frictionless piston loaded such that the pressure P under consideration is acting on water. Heat is added to the water so that its temperature increases from…

There are two important statements of second law. They are: 1. Kelvin Planck’s Statement, 2. Clausius Statement, 1. Kelvin Planck’s Statement: “It is impossible for a heat engine to produce network in a cycle, if it exchanges heat with a single reservoir” or “Heat engine cannot produce work output, if it exchanges heat with a…

Quasi means nearly or almost. So quasi-static process means nearly static process or nearly stationary process, or a process which proceeds with extreme slowness. Quasi-static process proceeds from one equilibrium state to another equilibrium state till the end of the process i.e., all the states passed during the process are all equilibrium states. In each…