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2025 Symposium
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Are Chillers the Future
2025 Symposium
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Reasons
Change to flammable refrigerants in the future.1
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It's not just because I like the art of piping systems
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History
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- Dates back to Romans
- 19th century, broader adoption due to cast iron radiators and steam boilers
- 20th century, introduction of pumps, energy efficiency, zone controls
- Popular choice for contemporary HVAC Systems
Definitions
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Define Chillers
Chillers are mechanical devices used in heating, ventilation, and air conditioning (HVAC) systems to remove heat from a liquid via a vapor-compression or absorption refrigeration cycle.
Applications in HVAC
- Commercial Buildings:
- Chillers are commonly found in shopping malls, office buildings, and hospitals, where they are used to cool large open spaces and maintain comfortable indoor temperatures.
- Industrial Processes:
- Chillers are used to cool machinery and products, particularly in manufacturing processes that generate substantial amounts of heat.
- Air Conditioning Systems:
- In large HVAC systems, chillers provide chilled water, which is then utilized by air handling units (AHUs) or fan coil units to cool air before it is distributed throughout the building.
- District Cooling:
- Chillers are sometimes used in district cooling systems, where a central chiller plant provides chilled water to multiple buildings in a defined area.
^ Note how residential does not appear on the list.
What do we do?
^ Ask the audience to answer.
What do we do?
- Provide healthy, safe, and comfortable environment.
- We move heat from one place to another, generally through refrigerant and air circulation...
- Water IS a refrigerant (R-718).
^ Second one is important to remember for later in the talk.
Fun Facts
| Density | Specific Heat | |
|---|---|---|
| Air1 | 0.075lb/ft3 | 0.24btu/lb |
| Water2 | 62.37lb/ft3 | 1.0btu/lb |
1Air density calculated for sea-level @ 70°. 2Water density calculated @ 60°.
https://hvacrschool.com/sensible-heat-in-air-and-water
Fun Facts
Source: Modern Hydronic Heating, by: John Siegenthaler, P.E.
^ Add to pros list.
A Home is Complex
- Shell / envelope
- Ventilation / exhaust
- Electrical
- Plumbing / hot water
- HVAC
- and more...
A home requires harmony between many different mechanical systems.
[.footer-style: #696969, alignment(center)] [.footer: From: 'What if Houses Came with Manuals' by Sam Meyers and Genry Garcia] [.background-color: #d3d3d3]
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Projected to change refrigerants again in the next 10-15 years. ↩︎