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### How a Chiller, Cooling Tower and Air Handling Unit work together

How does a Chiller, Cooling Tower and Air Handling Unit work together to provide air conditioning (HVAC) to a building. In this article we...

### Thermodynamic properties of refrigerant R-134a

Thermodynamic properties of refrigerant R-134a, also known as 1,1,1,2-tetrafluoroethane, R-134a, Freon 134a, Forane 134a, Genetron 134a, Florasol 134a, Suva 134a or HFC-134a and norflurane...

### Specific heat capacity of materials

The specific heat capacity of materials ranging from Water to Uranium has been listed below in alphabetical order. Below this table is an...

### Three Phase Electricity Explained

How does three phase electricity work? In this article we'll be explaining how three phase electricity works, we'll start from the basics of a...

### How Electricity Works

How electricity works
How does electricity work. In this article we’ll be learning the basic concept behind how electricity works according to classical theory. We’ll...

### Combine date and time cells in excel

You can easily combine date and time of two different cells in excel, all you have to do is enter the following into the formula...

### How to combine multiple cells in excel

Combine two cells in excel with a space between.
You can easily combine two different cells in excel, all you need to do is enter...

### SI Units

The SI units of measurement are based on seven quantities, other commonly used quantities are derived from these.
SI Base units:
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### Volume of a sphere

The volume of a sphere can be calculated using the following formula
V = (4÷3) x Π x r3
Where
V = Volume (m3)
Π = Pi (3.142 approx)
r...

### Ductwork sizing, calculation and design for efficiency

How to design a duct system. In this article we'll be learning how to size and design a ductwork system for efficiency. We'll include...

### How Electronic Expansion Valves work

How do Electronic Expansion Valves work? In this article we'll be discussing how electronic expansion valves work, covering the basic working principle, where to...