HVAC Equipment Sizing & Selection

Discover how the fan coil unit (FCU) provides localized heating and cooling via coils and a fan, with components like filters, thermostat, dampers, and grilles, integrated into central HVAC systems.

Size and select a fan coil unit by calculating cooling and heating loads, determining airflow from sensible heat, and choosing a model with cooling capacity, static pressure, and coil type.

Introduce how chillers remove heat from a liquid via vapor compression or absorption cycles, and cover core components (compressor, condenser, evaporator, expansion valve) and their types and applications.

Explore the steps to size and select a chiller for HVAC systems: determine cooling load, apply diversity factors, choose air or water cooled, and assess COP and EER.

learn to size chillers by calculating total building load, applying a diversity factor, and sizing three working plus one standby chillers, selecting an air cooled option with flow and temperatures.

Compute primary pump head by adding dynamic head to static and residual head as applicable; in closed loops static head cancels, in open loops meet discharge pressure (about seven psi).

Calculate secondary pump head for a chilled water system by summing dynamic head while neglecting static and residual heads, accounting for pipe length and fittings to select the pump.

Compute condenser water pump head for open-loop systems, including dynamic and static head. Apply TR to GPM conversion and fittings head loss to ensure 7 psi residual discharge pressure.

Explain the purpose of cooling towers in hvac systems and compare natural draft with mechanical draft, including induced and forced types, counterflow and crossflow configurations; define range, approach, and effectiveness.

Calculate cooling tower capacity using Q = m·cp·ΔT, converting gpm to lb/h. Determine supply and return water temps from wet-bulb, approach, and range to estimate heat rejection.

Explore the treated fresh air (TFA) unit, its components, and how it improves indoor air quality and energy efficiency through filtration, cooling and heating coils, and heat recovery.

Size and select a TFA unit by calculating fresh air using Ashrae 62.1, then compute sensible and latent cooling loads and choose coils, fans, and filters.

Calculate fresh air requirements per ASHRAE 62.1 for classrooms, offices, and lobby, then size a Hyderabad FAHU using sensible and latent heat to about 4.8–5 TR.

Explore what an HVAC coil is and its main heat transfer function. Review coil types: chilled water, hot water, direct expansion, steam, and electric, plus core construction terminology.

Discover coil selection part two, comparing parallel flow and counterflow in heat exchangers, and learn face area calculation and design criteria for coil sizing.

Size the coil by converting heat-load data into rows, face area, and total cfm, using dry-bulb temps, fresh air, effective sensible heat factor, bypass factor, and log mean temperature difference.

Master how smoke management systems control and purge fire smoke, protect occupants, and aid firefighting through positive and negative pressure, stairwell pressurization, and smoke extraction.

Calculate smoke extraction for an office space by determining fire area, heat release, smoke mass flow rate, plume temperature rise, and the required volumetric air flow rate to remove smoke.

Explore VRF systems: cooling only, heat pump, and heat recovery, with outdoor and indoor units, piping, distribution boxes, expansion valves, and controls.

Learn to size refrigerant piping for a VRV/VRF system using the Daikin design chart and capacity index, selecting outdoor units and coordinating raffinate joints across rooms.