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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...

### How Solenoids Work

In this article we're going to be looking into how solenoids work, how to see a magnetic field, how to create an electromagnet from...

### Power Factor Explained

Power Factor Explained. In this tutorial we look at power factor. We'll learn what is power factor, what is good and bad power factor,...

### 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...

### How Solenoid Valves Work

How Solenoid Valves Work, in this article we'll be looking at how Solenoid Valves work. We'll be looking at the basic operation of two...

### Inside Thermal Expansion Valves

Whats inside a thermal expansion valve and how the thermostatic expansion valve or TXV works in a HVAC refrigeration system. Learn the basic working...