Doherty Engineering, Brantford, Canada
In brief. Hot water and 8 bar steam from one turbine drive two Thermax chillers, which together give the office building about 1,900 kW of cooling.
At the office of a Canadian engineering company, a 4.6 MW gas turbine produces electricity, and its heat is used in two ways: hot water drives one Thermax absorption chiller, and 8 bar steam drives the other. Savings are 3,373 MWh per year, and the plant efficiency is about 90 %.
What does the project consist of?
| Parameter | Value |
|---|---|
| Industry | Engineering company, office |
| Engines | Quattro-Gen gas turbine, 4.6 MW |
| Fuel | Natural gas |
| Heat for the chiller | Hot water (203 °F, about 95 °C) and 8 bar steam |
| Chillers and cooling | 2 chillers: 180 TR on hot water and 370 TR on steam, about 1,900 kW (550 TR) in total |
| What the cooling is for | Building air conditioning |
Why is this example useful for a Russian site?
The heat of one turbine is split by temperature: 8 bar steam goes to the steam-fired chiller, and water at about 95 °C goes to the hot-water chiller. On steam, a double-effect chiller gives almost twice as much cooling from the same kilowatt of heat, and the steam chiller here is twice as large. A plant that has steam should start the calculation with it. More: trigeneration with gas turbines.
How does this kind of scheme work?
A heat recovery steam generator is installed after the turbine. In the diagram, steam goes to the steam-fired chiller and hot water to the heating network; in Brantford, the water also works for cooling.
Based on Thermax materials
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