1
Clifford C Federspiel, Harukiko Asada: Adaptable control of HVAC systems. Massachusetts Institute of Technology, Wolf Greenfield & Sacks, December 15, 1992: US05170935 (253 worldwide citation)

A system for providing adaptable control of an HVAC system which regulates environmental conditions within an enclosed area. In a preferred embodiment, the apparatus and method of the present invention measures selected environmental variables in the enclosed area, calculates a value of a comfort in ...


2
Clifford C Federspiel: Method and apparatus for estimating the rate at which a gas is generated within an enclosed space. Johnson Service Company, Foley & Lardner, November 7, 1995: US05464369 (38 worldwide citation)

A method and apparatus for controlling the environment within an enclosed space is provided. The apparatus monitors environmental variables, and responsive to the values of the environmental variables, estimates the rate at which a gas is being generated within the enclosed space. The apparatus gene ...


3
Clifford C Federspiel: Adaptive flow controller for use with a flow control system. Johnson Service Company, Quarles & Brady, February 23, 1999: US05875109 (30 worldwide citation)

An adaptive airflow control system for positioning damper systems or controlling air units utilized in an environment control system is provided. The system is based on a fixed-gain, proportional-only feedback design to provide stable operation given the nonlinear behavior of flow through a valve or ...


4
Clifford C Federspiel: Optimal ventilation control strategy. Johnson Service Company, Quarles & Brady, January 26, 1999: US05862982 (25 worldwide citation)

The present invention provides a method of modeling multi zone ventilation systems. The method integrates flow rate standards with the concept of age of air. The method serves as the basis for several different ventilation effectiveness calculation methods, and for translating outdoor air requiremen ...


5
Clifford C Federspiel: Adaptive flow controller for use with a flow control system. Johnson Service Company, Harness Dickey & Pierce, June 16, 1998: US05768121 (23 worldwide citation)

The present invention relates to an adaptive airflow control system for positioning damper systems or controlling air units utilized in an environment control system. The system is based on a conservative, fixed-gain, proportional-only feedback design to guarantee stable operation given the nonlinea ...


6
Clifford C Federspiel: Method and apparatus for estimating the rate at which a gas is generated within a plurality of zones. Johnson Service Company, Harness Dickey & Pierce, August 27, 1996: US05550752 (19 worldwide citation)

An apparatus for estimating the rate at which gas is generated in a plurality of zones is disclosed. It includes at least one sensor to measure values of environmental variables of at least two of the zones. Signals representative of the values are generated and provided to a gas flow model circuit. ...


7
Clifford C Federspiel: Pressure based flow rate measurement device integrated with blades of a damper. Heisler & Associates, May 6, 2003: US06557574 (17 worldwide citation)

A differential pressure based flow rate measurement device is provided which is coupled to surfaces of a blade


8
Clifford C Federspiel: Method and apparatus for coordinating the control of HVAC units. Federspiel Corporation, Kilpatrick Townsend & Stockton, David B Raczskowski, July 17, 2012: US08224489 (6 worldwide citation)

A control strategy for heating, ventilating, and air-conditioning (HVAC) units used to condition the environment in data centers and other commercial buildings such as retail stores with an open-plan design is provided to coordinate the operation of the actuators of the HVAC units. A supervisory con ...


9
Clifford C Federspiel, Jerry Chin: Energy-optimal control decisions for systems. Vigilent Corporation, Kilpatrick Townsend & Stockton, David B Raczkowski, December 30, 2014: US08924026 (4 worldwide citation)

Methods, systems, and apparatuses are provided for controlling an environmental maintenance system that includes a plurality of sensors and a plurality of actuators. The operation levels of the actuators can be determined by optimizing a penalty function. As part of the penalty function, the sensor ...


10
Clifford C Federspiel, Jerry Chin: Accuracy-optimal control decisions for systems. Vigilent Corporation, Kilpatrick Townsend & Stockton, David B Raczkowski, March 22, 2016: US09291358

Methods, systems, and apparatuses are provided for controlling an environmental maintenance system that includes a plurality of sensors and a plurality of actuators. The operation levels of the actuators can be determined by optimizing a penalty function. As part of the penalty function, the sensor ...