Category: FAQ’s

1. Heat Engine: Heat engine converts heat energy into mechanical energy. Heat engine works on thermodynamic cycle like Otto, Diesel, Rankine in which there is a net heat transfer to the system and a network transfer from the system. Heat engines are broadly classified into two types: (i) External combustion engines. (ii) Internal combustion engines.…

There are three different types of air washers. They are: 1. Spray Type Air Washer: There is no standardisation for air washers. The essential requirements in the air washer operations are: (a) Uniform distribution of the air across the spray chamber. (b) An adequate amount of spray water broken up into fine droplets. (c) Good…

Air washer is a device that may be used for: (a) Cooling and dehumidification (b) Cooling and humidification (c) Heating and humidification (d) Humidification (e) Adiabatic saturation (f) Cooling. The schematic diagram for air washer is shown in Fig. 37.7. Following are the processes that can be carried out with the help of washer shown…

To answer this let us consider for the sake of simplicity that only one FWH is used. The aim of using any feed water heater is to heat the feed water as close to the boiler temperature as possible. We may now place the feed water heater at position 1, 2 or 3. TB and TC are…

The advent of high speed passenger aircraft, jet aircraft and missiles has introduced the need for compact and simple refrigeration systems capable of high capacity with a minimum reduction of payload. When the power requirements needed to transport the additional weight of the refrigerating system are taken into account, air cycle system usually prove to…

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…