# Thermodynamics

## The effects of work, heat and energy on a system

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### 1st Law of Thermodynamics

The First Law of Thermodynamics simply states that energy can be neither created nor destroyed (conservation of energy). Thus power generation processes and energy sources actually involve conversion of energy from one form to another, rather than creation of energy from nothing

### 2nd Law of Thermodynamics

The second law is concerned with entropy, which is a measure of disorder. The second law says that the entropy of the universe increases

### Absorbed Solar Radiation

Solar radiation absorbed by various materials

### Bimetallic Strips

Bending of bimetallic strips due to heat

### Carnot Efficiency

The efficiency of the Carnot cycle

### Coefficients of Linear Thermal Expansion

Linear temperature expansion coefficients for some common materials as aluminum, copper, glass, iron and many more

### Conductive Heat Transfer

Heat transfer takes place as conduction if there is a temperature gradient in the solid

### Convective Heat Transfer

Heat transfer between a solid and a moving fluid is called convection. This is a short tutorial about convective heat transfer

### Cooling Mode and Heat Flux

Heat flux for various cooling modes

### Critical Points some common Substances

Critical points of some common substances like air, argon, helium and more

### Density of Fluids - Changing Pressure and Temperature

Calculating density of fluids when changing pressure and temperature

### Diffusion Coefficients

A substance will flow from a region of high concentration to a region of low concentration

### Dowtherm A

Physical properties of Dowtherm A

### Efficiency

Ratio between useful energy output and energy input

### Emissivity Coefficients of some common Materials

The radiation heat transfer emissivity coefficient of some common materials as aluminum, brass, glass and many more

### Energy

Energy is the capacity to do work

### Energy Conversion Factors

Convert between energy units

### Energy Density for various Storage Forms

Energy density by weight and volume for some common storage forms

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### Energy Storage in Water - kWh

Thermal heat energy stored in water

### Energy Transfer Equation

Fluid energy transfer

### Fouling and Heat Transfer

The overall heat-transfer coefficient of a heat exchanger under operating conditions is reduced by fouling

### Freezing Mixtures and Cooling Agents

Temperature with freezing mixtures and cooling agents

### Freezing Points Common Liquids

Common fluids and their freezing points

### Heat Capacity

The heat capacity of a substance is the amount of heat required to change its temperature by one degree, and has units of energy per degree

### Heat Exchangers - Arithmetic and Logarithmic Mean Temperature Difference

Arithmetic Mean Temperature Difference - *AMTD* - and Logarithmic Mean Temperature Difference - *LMTD* - formulas with examples - Online Mean Temperature Calculator

### Heat Storage in Materials

Physical properties of sensible heat storage materials

### Heat Transfer Coefficients in Heat Exchangers

Overall heat transfer coefficients in some common heat exchanger constructions - tubular, plate and spiral

### Heat, Work and Energy

Tutorial to heat, work and energy - essentials as specific heat and specific heat capacity

### Heating Up Applications - the Energy Required and Heat Transfer Rate

Energy required heating up substances

### Heating Value

The gross (high) and net (low) heating values

### Ideal Gas Properties of Nitrogen

Enthalpy, internal energy and entropy of Nitrogen

### Latent Heat of Melting of some common Materials

The latent heat of fusion when changing between solid or liquid state of some common materials as aluminum, ammonia, glycerin, water and more

### Microwave Heating

Heating with microwaves

### Mollier Chart Water - Imperial Units

Mollier chart in English Units

### Mollier Chart Water - Metric Units

Mollier chart in Metric Units

### Mollier Diagram for Water-Steam

Enthalpy-entropy diagram for water and steam

### Overall Heat Transfer Coefficient

Calculate overall heat transfer coefficient - walls or heat exchangers

### Overall Heat Transfer Coefficients for some common Fluids and Heat Exchanger Surfaces

Average overall heat transmission coefficients for some common fluids and surface combinations as Water to Air, Water to Water, Air to Air, Steam to Water and more

### Power Plant Performance Factors

Power plants and heat rate, thermal efficiency, capacity factor, load factor, economic efficiency, operational efficiency, energy efficiency

### Properties and State

Concept of properties and state

### Radiation Constants of some common Building Materials

The radiation constant is the product between the Stefan-Boltzmann constant and the emissivity constant for the material

### Radiation Emissivity of some common Materials

Radiation emissivity of some common materials - Water, Ice, Snow, Grass ..

### Radiation Heat Emissivity for Aluminum

Radiation heat emissivity of unoxidized, oxidized and polished aluminum

### Radiation Heat Transfer

Heat transfer due to emission of electromagnetic waves is known as thermal radiation

### Rankine Efficiency

The efficiency of the Rankine cycle

### Resistivity from Conductivity

Thermal resistivity and conductivity

### Salt Hydrates - Melting points and Latent Energy

Melting points and latent energy of salt hydrates

### Specific Heat

The Specific Heat is the amount of heat required to change a unit mass of a substance by one degree in temperature

### Specific Heat Converter

Online specific heat calculator with the most common units

### Standardized Enthalpies and Entropies

Standardized enthalpies and entropies of some common substances

### Surface Absorptivity

Radiation surface absorptivity

### Temperature

A short introduction to temperature - including Celsius, Fahrenheit, Kelvin and Rankine definitions - online temperature converter

### Temperature Expansion Coefficients of some common Piping Materials

Expansion coefficients of some common materials used for pipes and tubes - aluminum, carbon steel, cast iron, PVC, HDPE and more

### Temperature in Mixed Liquids or Solids

Final temperature when mixing liquids or solids

### Thermal Conductivities of Heat Exchanger Materials

Typical heat exchanger materials and thermal conductivities

### Thermal Conductivity Common Liquids

Common fluids and their thermal conductivity

### Thermal Conductivity Conversion Factors

Convert between thermal conductivity units

### Thermal Conductivity Online Converter

An online thermal conductivity calculator

### Thermal Conductivity of some common Materials and Gases

Thermal conductivity of some common materials and gases - like insulation products, aluminum, asphalt, brass, copper, steel ...

### Thermal Expansion - Linear

Linear temperature expansion - online calculator

### Thermal Expansion - Superficial i.e. Area

Superficial i.e area temperature expansion - online calculator

### Thermal Transmittance - U and Thermal Resistance - R

Thermal transmittance - U - from thermal resistance

### Thermodynamic Terms

Common thermodynamic terms - potential energy, kinetic energy, thermal or internal energy, chemical energy, nuclear energy and more

### Third Law of Thermodynamics

The entropy of a substance is zero if the absolute temperature is zero

### Units of Heat - *BTU, Calorie and Joule*

The most common units of heat are *BTU - British Thermal Unit, Calorie and Joule*

### Volume Expansion Coefficients of Solids

Cubical expansion coefficients for some common solids

### Volumetric - Cubic - Thermal Expansion

Cubical expansion when changing temperature - online calculator

### Volumetric - Cubical - Expansion Coefficients of some common Liquids

Volumetric expansion coefficients of some common fluids

### Water - Temperature and Specific Gravity

Specific gravity of water ranging *32 - 600 ^{o}F*

### Work

The amount of work done is the product of the applied force and the distance

### Zeroth Law of Temperature

Temperature and heat flow