HVAC Commissioning: A Practical Checklist
A 13-step HVAC commissioning checklist from design intent to seasonal testing, plus the classic site findings and how to spot them quickly.
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Cooling & Chilled Water
Cooling Towers: Range, Approach and Selection
Range, approach and wet bulb define every cooling tower duty. Learn how to size the heat rejection, flow and make-up water, and what to check on siting.
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Fan Coil Unit Selection Step by Step
Select fan coils on sensible capacity at real conditions and medium speed: an eight-step method with a worked office, water flow and noise check.
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Condensate Drain Trap Design for AHUs and FCUs
How to design condensate traps and drains for AHUs, fan coils and cassettes: seal height from the drain pan pressure, plinth height, falls, air breaks, condensate quantities and pump interlocks.
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Chilled Water Pump Head: A Quick Estimate
A fast, defensible way to estimate the head of a closed chilled water pump from the index circuit, with typical component losses, a worked 900 kW example at 229 kPa and the mistakes that oversize pumps.
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Psychrometric Chart for AHU Design: Mixing, Coils and Reheat
A practical guide to the psychrometric chart for air handling unit design: reading the seven properties, the room SHR line, mixing, coil ADP and bypass factor, fan heat, humidification and a full summer worked example.
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Cooling Load Calculation Basics: Solar, Internal and Latent Loads
The essentials of a cooling load calculation – heat gain versus cooling load, solar and shading, internal and latent loads, coil load and zone diversity – with a worked west office and a full office floor.
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