Heat exchanger performance

Learn about the heat exchanger performance of the rear door heat exchanger.

An example of expected performance of the rear door heat exchanger is illustrated in Typical performance of a rear door heat exchanger, 32 kW heat load load for a typical inlet air temperature of 24°C (75.2°F), with a fully populated rack near uniform power dissipation, 32 kW heat load, and the node fans running near nominal fan speed (1530 cfm). By selecting the water inlet temperature and water flow rate, you can estimate the indicated heat removal. These levels can be achieved with normal cable exits from the rack and with the small amount of hot air bypass at the base of the door (small amounts of hot air escaping from the rack without being cooled by the door).

As described in Heat exchanger specifications, water temperatures below 18°C (64.4°F) can be used only if the system that is supplying the water is able to measure the room dew point conditions, and automatically adjust the water temperature accordingly.

Another example of performance data is shown in Typical performance of a rear door heat exchanger, 20 kW heat load for identical conditions as in Typical performance of a rear door heat exchanger, 32 kW heat load, except reflecting a 20 kW heat load. Because of the lower heat load, a specific level of cooling can be achieved with warmer water, a lower flow rate, or both.