You can get $150 for the right kind of gas, propane or oil furnace or hot water boiler, and $50 for an "advanced main circulating fan," such as a variable-speed air handler, which runs at lower speeds and uses less energy than a typical single-speed air handler.
In addition, to control the air flow rate, a variable speed drive is coupled with the condenser fan.
The sand column was then saturated with deionized water by allowing upward flow to minimize air entrapment using a variable speed pump (Fluid Metering, Syosset, NY, USA) until steady-state flow condition was achieved (Fig. 2).
In this paper, a nonlinear autoregressive neural network with exogenous inputs (NARX) is proposed to model the dynamic behaviour of an automotive air conditioning (AAC) system equipped with a variable speed compressor.
Exhaust air from a single pen was extracted by a variable speed centrifugal fan and passed through a humidifier and biofilter.
In the simulations with the high efficiency electrostatic air cleaner, we modeled a modern AHU equipped with a variable speed fan that operates at full speed during periods of heating and cooling demand and at half-speed during all other times.
Rapid cycling the compressor of an air conditioning or refrigeration system can be used to modulate capacity, thus offering an alternative to a variable speed compressor.
The off-design operation is achieved handling the following parameters: air mass flow rate, fuel mass flow rate, combustor bypass, gas turbine bypass, avoiding the use of a variable speed control system.
I suppose it was written at a variable speed.
A variable speed limit was introduced, determined by sensors.
