US 5,819,721 AGranted

Flow control system

AssigneeTridelta Industries, Inc.

InventorsLarry L. Carr, Dennis S. Mizerak

Life of this patent

Estimating the term…

Loading patent…

Abstract

A control system for regulating a flow rate of a heat transfer fluid in a heat transfer system, the heat transfer system having a heat transfer fluid flow path, flow control device for creating flow along the path, a fuel source for providing a combustible fuel to the path, an air source for providing combustion air to the path, and an assembly for combusting the fuel and air, the control system comprising a sensor for sensing a measured flow value at the air source, a controller for storing an optimum flow value at the air source and for storing a range of operating control values for the flow control device, the operating control values corresponding to the optimum flow value, a system for calculating a deviation between the measured flow value and the optimum flow value, and a system for varying the operation of the flow control means in accordance with the deviation.

Claims6

Dependent claims

A heating apparatus including:

a combustion air inlet;
a burner assembly for receiving a flow of combustion air and for burning a mixture of combustion air and combustible fluid to produce a combusted fluid air mixture;
a heat exchanger defining a path for a flow of combusted fluid air mixture therethrough;
a variable motor-driven fan for creating a flow of the combustion air through said burner assembly and for providing a flow of the combusted fluid air mixture along said path through said heat exchanger;
a pressure sensing system for determining a difference in pressure between two positions along said path and for providing a series of pulses having a frequency related to said difference in pressure;
a microprocessor control system comprising:
means for converting the series of pulses into an indication of the difference in pressure,
means for storing at least one predetermined pressure differential value,
means for determining a deviation between the indication of difference in pressure and the at least one predetermined pressure differential value, and
means operatively connected to said motor-driven fan for adjusting the difference in pressure between the two positions along said heat exchanger in accordance with said deviation.

7 more elements

Dependencies are inferred from the claim text.