Control of heating and ventilation systems
First Claim
1. A ventilation control system for a building housing an indoor swimming pool, comprising at least two fans for respectively supplying air to and extracting it from the interior of the building, separate driving means for each of said fans in the form of electric motors the speed of which varies with the voltage applied thereto, a temperature sensor mounted externally of the building and means operable in response to the temperature sensed by said sensor for automatically varying the speed of the fan motors as an inverse function of the sensed outside temperature such that said fan driving motors are operated at maximum speed for maximum ventilation at a preselected minimum outside air temperature and at a fixed lower speed at and above a preselected higher temperature, whereby total energy consumption of the fans is reduced.
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Abstract
A control system is provided which automatically varies the degree of ventilation of an indoor swimming pool in response to variations in the outside temperature and comprises separate speed-regulating means for each of the fan-driving motors, each speed-regulating means being operated in response to signals received from a master controller connected to the output of an external temperature sensor. The control system also incorporates means for automatically lowering the level of the temperature to be maintained when the swimming pool is unoccupied, in inverse proportion to the difference between the outside and inside temperatures, this lowering being effected in small increments at relatively long intervals of time.
29 Citations
11 Claims
- 1. A ventilation control system for a building housing an indoor swimming pool, comprising at least two fans for respectively supplying air to and extracting it from the interior of the building, separate driving means for each of said fans in the form of electric motors the speed of which varies with the voltage applied thereto, a temperature sensor mounted externally of the building and means operable in response to the temperature sensed by said sensor for automatically varying the speed of the fan motors as an inverse function of the sensed outside temperature such that said fan driving motors are operated at maximum speed for maximum ventilation at a preselected minimum outside air temperature and at a fixed lower speed at and above a preselected higher temperature, whereby total energy consumption of the fans is reduced.
- 6. A ventilation control system for a building housing an indoor swimming pool, comprising at least two fans for respectively supplying air to and extracting it from the interior of the building, separate driving means for each of said fans in the form of electric motors the speed of which varies with the voltage applied thereto, a temperature sensor mounted externally of the building and means operable in response to the temperature sensed by said sensor for automatically varying the speed of the fan motors as an inverse function of the sensed temperature over a predetermined temperature range such that the degree of ventilation increases as the outside temperature falls and vice-versa, and wherein said fan motors are separately connected to a common electrical power supply through voltage regulators each of which is driven by a modulating motor and all the modulating motors are operable in accordance with the outside temperature by a master controller connected to the output of said temperature sensor, said system further including setback controls for reducing the reference value for the temperature and quantity of the air which is required to be supplied during periods when the building is not occupied, including manually operable means connected to said master controller for selecting the commencement and duration of the setback period, a step controller provided with a plurality of sequentially operable switches for varying said temperature point, a cyclic cam timer for feeding the outputs from said step controller to the pool heating controls and a modulating motor for driving said step controller in accordance with signals received from said master controller.
Specification