Co-Generation Systems: A Comprehensive Guide
What are Co-Generation Systems?
Co-generation, often linked to power production and heat production, is a system that evaluates the thermodynamic performance of a plant to gauge its efficiency and feasibility. It's an important concept in co-generation design.
Understanding the Thermodynamic System
The thermodynamic system is categorized by matter contained within an enclosure that separates it from the environment. There are five types: open, closed, di-thermal, adiabatic, and isolated.
Heat Transfers
There are three types of heat transfer: conduction, convection, and radiation. Let's start withconduction. Conduction transfers heat through molecular collisions of solids and is the most common heat transfer. The transfer of thermal energy is from greater kinetic energy to lower kinetic energy levels.
Convectionis heat transfer through circular means, applied with fluids (gases). For example, when air is heated, it rises and pushes the colder and denser air down, causing a circular motion. The last type is calledradiation, which is through the emission of electromagnetic waves due to the random movements of molecules and atoms in matter.
Heat Energy and Temperature
Heat energy is measured in joules (J), but you might be more familiar with temperature, a physical quantity that describes the degree of heat energy in a body. It's measured with a thermometer and can be in Celsius or Fahrenheit.
Entropy and Ordered Motion
Why can't we use this energy for work? The reason is because work needs to be from ordered molecular motion. Entropy also reflects the disorder of a system. The concept of thermal dynamics is based on three fundamental laws...
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