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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HVAC
Heating, cooling and ventilation design: loads, ducts, pipes, AHUs, pumps and ventilation rules.
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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VAV Box Selection: Sizing, Minimum Flow and Noise
Size a VAV box from the zone load, set a minimum airflow the sensor can measure and the ventilation needs, and pick an inlet that stays quiet.
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Stair Pressurisation: Quick Airflow Design
Estimate the fan duty of a pressurised stair from closed-door leakage and open-door velocity, then check the door opening force and relief.
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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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Underfloor Heating: Quick Design Rules
Heat flux, surface limits, flow temperature and loop lengths for wet underfloor heating, with a worked living room and the bathroom that sets the flow temperature.
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Radiator Sizing: Correction Factors for Low Temperatures
Catalogue radiator outputs are for 75/65/20 °C; at heat-pump temperatures you need two to three times more. Here are the factors and a worked room.
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Heat Pump Sizing and the Bivalent Point
Find where the heat pump stops coping on its own: a straight-line load and capacity check gives the bivalent point and the backup heater size in minutes.
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Commercial Kitchen Hood Exhaust Airflow: Quick Sizing
Size commercial kitchen hood exhaust from hood length and appliance duty, then balance it with make-up air and size the grease duct, with a worked 4 m heavy-duty wall canopy at 2480 L/s.
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Expansion Vessel Sizing for Heating Systems
Size a heating expansion vessel in five steps from system volume, maximum temperature, static height and safety valve setting, with a worked 200 kW example, a quick house check and the site settings that matter.
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