The heat pipe, in contrast, precools whenever the outdoor air is warmer than the leaving air off the cooling coil, which in this case is 52[degrees]F (11[degrees]C)--well below the return air temperature.
In this example, the air handler is a chilled water dedicated outdoor air system (DOAS) where its sole purpose is to precool and dehumidify the ventilation air and deliver neutral-temperature air to the space (or deliver pretreated air to other air handlers).
The more reheat the system requires, the more it will precool the air, and the more the wraparound heat pipe will ultimately save.
In summer the exhaust air is cooler than the ambient conditions and precools
the hot incoming airstream, thereby minimizing the energy required of the A/C refrigeration system.
To maintain air-ventilation levels and save on costs, an energy-recovery unit, located on the roof, preheats or precools
outdoor air with energy recovered from the exhaust air.
Sharp's refrigerator uses a neural net that learns to predict the time of day during which a higher frequency of door openings occurs, and it precools the insides so the temperature remains suitably low .
An 8-day moving average is calculated to absorb daily variance, and a neural network decides when to defrost, precool, deodorize, and use low-noise drive by processing the daily pattern.
However, the demand-dominated optimization precools to the lower comfort bound to achieve the lowest on-peak demand possible.
As the TDL is further reduced, the simulated building can no longer respond to the TDL and the optimizer will use more energy to precool the thermal mass as much as possible prior to the workday in an attempt to further limit demand.
The indirect cooler precools
the air before it enters the air handler.