HVAC Chilled Water Piping System Design from A to Z

Learn why the chilled water system enables large cooling capacity by distributing water to many evaporators, and compare refrigerant-based direct expansion with chilled water coils.

Compare air cooled and water cooled chillers, detailing condenser cooling methods and evaporator and condenser heat exchangers, including shell-and-tube and plate-to-plate designs, for chilled water cooling of air handling units.

Contrast water cooled and air cooled chillers, focusing on chilled water systems with cooling towers, two loops, and rooftop DCS units, and weigh energy and life cycle cost.

Understand the chilled water circuit with pump, chiller, evaporator, condenser, air handling unit, cooling tower, and open and closed loops. Note expansion tank, air separator, and chemical dosing.

Explore primary and secondary pump configurations for chiller plants, including dedicated pumps and common headers, plus air cooled chillers, expansion tanks, and district cooling heat exchangers.

Explore how height affects static pressure in closed-loop chilled water systems for high-rise buildings, and select pump head and component ratings in bars to prevent overpressure.

Compare direct return and reverse return piping in hvac chilled water systems, noting reverse return self-balancing, higher piping costs, and mandatory balancing valves for worst-case pressure drops.

Illustrates how to size a chilled water piping network using a schematic, explaining minimum 25 pipe size, 10% safety margin, and Ashrae 90.1 velocity guidelines.

Compare air-cooled and water-cooled chillers, detailing capacities, components, and installation locations; explain how chilled water temperature and flow rate affect power use, and why primary-secondary systems aid part-load response.

Select hvac chilled water pumps by sizing for flow rate and head using a Grundfos online tool; compare performance curves and iso eta efficiency to find a near optimal pump.

Explore hvac chilled water and cooling water pumps, covering centrifugal and positive displacement types, and compare base mounted and inline configurations, including couplers and alignment considerations.

Discover how cooling towers serve as heat exchangers that transfer condenser heat from large chillers to outdoor air, enabling high-capacity water-cooled systems in district plans.

Examine the cooling tower components, including FRP or RCC bodies, basins, fill and spray nozzles, drift eliminators, air louvers, and water level controls.

Distinguish open and closed circuit cooling towers and examine natural and mechanical drafts, counter flow and cross flow, including heat exchangers, spraying, pumps, and maintenance considerations.

Learn how to select cooling towers for a four-tower, one-standby layout with 1.25x heat rejection, and evaluate range, approach, and ambient wet-bulb temperature to optimize efficiency.

Analyze real project layouts of chilled water piping, noting primary and secondary pumps, chillers, headers, expansion tanks, chemical dosing, and compare two-way versus three-way configurations for simplified flow paths.