Cooling Fundamentals
How buildings are cooled in the tropics — from why air conditioners move heat rather than make cold, through chillers and cooling towers, to the efficiency numbers that decide most of your electricity bill.
Start the course- 1
How Does an Air Conditioner Work? It Moves Heat, It Doesn't Make Cold
An air conditioner does not create cold. It scoops heat out of your room and dumps it outside. This one reframe unlocks how all cooling actually works.
- 2
The Refrigeration Cycle Explained Simply: The Loop That Carries Heat Outside
The refrigeration cycle explained in plain language: one fluid boils indoors to soak up heat and condenses outdoors to dump it, round and round forever.
- 3
The 4 Main Parts of an Air Conditioner (and What Each Does)
Compressor, condenser, expansion valve, evaporator: meet the four parts of every air conditioner and follow one droplet of refrigerant all the way around.
- 4
What Is Refrigerant, and Why Does It Keep Changing? R22, R410A, R32 Explained
Why new air conditioners say R32 while old ones said R22 or R410A. A plain-language guide to refrigerants, GWP, phase-downs, safety classes, and leaks.
- 5
Why Is My Office Cool but Still Humid? Sensible Heat, Latent Heat and Dew Point
Why is my room cool but humid? Learn how sensible and latent heat, relative humidity and dew point explain sticky air in tropical Malaysian buildings.
- 6
Indoor Air Quality in Offices: Fresh Air, Filters and What CO2 Really Tells You
How offices keep air healthy with ventilation, filters and CO2 sensing — why 1000 ppm is Malaysia's legal limit and how fresh air costs cooling energy.
- 7
Window, Split and VRF Air Conditioners: What's the Difference?
Window vs split vs VRF air conditioners explained simply: how each cools, why VRF's inverter compressor matches demand, and which suits your building.
- 8
How Does a Chilled-Water System Work? The Two Loops Explained
How does a chilled water system work? A plain-language guide to the two water loops plus one refrigerant loop that cool an entire building from one chiller.
- 9
AHU vs FCU: The Difference Between an Air Handling Unit and a Fan Coil Unit
AHU vs FCU difference, explained in plain terms: one big unit ventilates a whole zone with fresh outdoor air, one small unit trims cooling in a single room.
- 10
How Does a Cooling Tower Work? Throwing a Building's Heat at the Sky
How a cooling tower rejects a building's heat by evaporating water, why range and approach grade it, and how Malaysia's humid wet-bulb sets a cold-water floor.
- 11
What Is a VAV System? How Ducts, Dampers and Static Pressure Deliver Cool Air
What is a VAV system? Learn how ducts, motorised dampers and static pressure deliver just the right amount of cool air to each zone — and save fan energy.
- 12
How to Calculate a Building's Cooling Load: Where Heat Sneaks In
Learn how to calculate cooling load: solar gain, envelope, humid outdoor air and internal gains, why tropical buildings differ, and why right-sizing matters.
- 13
What Is a Ton of Refrigeration? Tons, BTU and kW of Cooling Made Simple
A ton of refrigeration is 12,000 BTU/h, or 3.517 kW of cooling. Learn what tons, BTU and kW really mean — and why the word kW trips up almost everyone.
- 14
Why Air Conditioning Is the Biggest Line on a Malaysian Building's Electricity Bill
In a Malaysian building, cooling is often over half the electricity bill. Follow the ringgit to see why the chiller wins over lights, lifts and plug loads.
- 15
COP, EER and kW per Ton: How to Read Chiller and Aircon Efficiency Numbers
COP, EER, CSPF and kW/ton all grade one thing: cooling delivered per unit of electricity. Learn to read each one and honestly grade your own chiller plant.
- 16
Why Chiller Efficiency Is Measured at Part Load: Understanding IPLV
Why a chiller's full-load nameplate number lies, and how IPLV blends part-load efficiency into one honest figure that reflects how chillers really run.
- 17
Low Delta-T Syndrome: The Silent Efficiency-Killer of Chilled-Water Plants
Low delta-T syndrome forces chilled-water plants to over-pump and over-stage chillers for the same comfort. Learn what it is and why it hides on the bill.
- 18
Oversized Chillers, Short-Cycling and Dirty Coils: The Cheapest Efficiency Wins
Why bigger chillers waste energy through short-cycling and how dirty coils quietly starve cooling capacity — the cheapest efficiency fixes in any building.
- 19
What Is a BMS? How Building Controls Run the Cooling Plant
What is a building management system? Learn the sense-compare-act control loop, BACnet vs Modbus, smart cooling strategies, and the honest limit of a BMS.
- 20
BEI Malaysia: Scoring Your Building's Cooling by Measuring It
What Malaysia's Building Energy Index and MS1525 reveal about the hidden cooling waste in a building that feels perfectly fine — and why you can't fix a plant you don't…