HVAC Design, Cooling Load

Learn how to calculate airflow through door undercuts and transfer grilles using room air balance, opening area, pressure difference, and airflow equations. This guide includes practical HVAC examples, grille sizing methods, pressure-drop considerations, and key design rules to help maintain proper room pressure, comfort, ventilation, and system performance.

Learn how to design HVAC plenums that distribute air smoothly without causing turbulence, pressure loss or excessive noise. This guide covers plenum sizing, airflow velocity, fan discharge effects, transitions, branch placement, acoustic treatment, diffuser boxes, troubleshooting and a worked design example.

Flexible ductwork can simplify HVAC installations, but excessive length, sag, compression and sharp bends can cause significant pressure loss, reduced airflow, noise and higher fan energy. This article explains recommended length limits, support spacing, bend radius, velocity effects and practical installation checks for reliable system performance.

Proper return-air grille sizing is essential for controlling HVAC noise, pressure loss and fan energy. This guide explains how to calculate grille area, select suitable face velocities, evaluate NC ratings, account for free area and filters, and verify manufacturer performance for quieter, more efficient air-distribution systems.

The Coandă effect helps supply air remain attached to the ceiling, increasing horizontal throw and allowing better mixing before it reaches occupants. This guide explains the physics behind ceiling jets, diffuser throw, drop and spread, VAV dumping, common design mistakes, selection principles and commissioning methods for comfortable air distribution.

Proper diffuser selection is essential for comfortable and efficient air distribution. This guide explains how to use throw, drop and spread to determine suitable diffuser sizes, airflow patterns and locations while controlling drafts, noise and pressure loss. It also includes practical calculations, catalogue guidance and a worked office example.

Discover the main types of condensate drain pipe insulation, including elastomeric foam, polyethylene, cellular glass, phenolic foam, fiberglass, and mineral wool. Learn their applications, advantages, disadvantages, selection criteria, installation requirements, and best practices for preventing condensation, corrosion, mold, and ceiling damage.

Learn how elastomeric foam, polyethylene, fibreglass, mineral wool, PIR, phenolic foam, cellular glass and other insulation materials protect water supply pipes. This guide compares their applications, advantages and disadvantages while covering condensation control, heat loss, outdoor protection and installation best practices.

Choosing the correct chilled-water pipe insulation is essential for preventing condensation, reducing heat gain and protecting pipes from corrosion. This guide compares elastomeric rubber, fibreglass, PIR, PUR, phenolic foam, cellular glass, polystyrene, polyethylene and mineral wool, covering their applications, advantages, disadvantages, vapour-control requirements and installation considerations.

Discover the main types of HVAC duct insulation, including fiberglass, elastomeric rubber, rock wool, phenolic foam and PIR. Learn their ideal applications, advantages, disadvantages, condensation-control capabilities, fire performance and key selection considerations for efficient, durable duct systems.

Designing ventilation systems for garbage rooms, cold rooms, and chilled storage facilities requires far more than applying conventional HVAC design methods. These specialized spaces demand a thorough understanding of refrigeration principles, ventilation strategies, heat transfer, infiltration, humidity control, odor management, and equipment selection to ensure reliable performance and long-term operational efficiency. This comprehensive engineering guide explains the comp

A comprehensive engineering guide to sub-zero refrigeration systems covering cold room design, freezer load calculations, humidity control, infiltration management, equipment selection, frost prevention, and energy-efficient refrigeration strategies for industrial and commercial applications.