United Technologies Corporation

William W Bitterli

John E Games

David M Healey

Richard E Rosien

A terminal reheat HVAC system which regulates the temperature in a plurality of temperature controlled spaces by modulating the temperature of cool discharge air presented to each of the spaces from an air handler source, each space receiving the cool discharge air through an associated space distribution unit which includes heating apparatus supplied from a common heat source for reheating the cool air to provide temperature regulation within the space in response to a space temperature error signal from an associated space temperature control, is controlled by electronic processing means in combination with dedicated sensing and control apparatus which provide actuation of the air handler and common heat source only in response to actual sensed space temperatures outside of a temperature band established by heat and cool temperature reference signals stored in the electronic processing means, the electronic processing means further providing modulation of the cool discharge air temperature from the air handler, following actuation in response to an actual sensed space temperature higher than the cool temperature reference, in dependence on the temperature difference between the actual space temperature and the cool reference.

Energy conservative control of terminal reheat heating, ventilating, and

Apparatus is provided for controlling, during unoccupied periods, the operation of an HVAC system and perimeter heating system providing hot air and hot fluid, respectively, to a temperature controlled living space having occupied and unoccupied periods, the apparatus including an electronic processing means in combination with dedicated sensing apparatus, the apparatus providing controlled actuation of the HVAC and permieter heating system in dependence on the temperature difference between an actual space temperature signal and unoccupied space heat and cool reference temperature signals, the apparatus further providing an optimum start-up procedure including simultaneous actuation of the HVAC and perimeter heating system to accelerate the heating of the space, the HVAC discharge temperature being modulated during the start-up procedure in dependence on the temperature difference between the actual space temperature and an occupied space heat reference temperature signal, the perimeter heating system discharge temperature being preset to a start-up reference discharge temperature having a value greater than that maximum perimeter heating system discharge temperature permitted in normal operation.

Temperature control of unoccupied living spaces

A central control system includes a central processing unit (CPU) installed in a central location of a facility, and interconnected with a plurality of remote controllers, each located in an associated one of several buildings in the facility and each including a remote microprocessor (RMP), the CPU automatically controlling, simultaneously from the central location, the closed loop operation of individual environmental conditioning systems in the several buildings comprising the facility in combination with the RMP associated therewith and in dependence on the sensed temperature conditions within the living spaces associated with each system. The CPU includes a keyboard responsive to operator control for receiving selected parameter reference values provided by the operator at the central location, the reference values establishing the closed loop gains and reference temperatures for the individual environmental systems, the reference values being instantaneously changeable by the operator in one, or all of the environmental systems to accommodate changes in operating conditions. The central control including two CPUs, each fully capable of providing automatic control of the facility environmental conditioning systems in combination with the RMPs, the system further including redundant interconnecting lines between each CPU and the plurality of RMPs, each line including a liner receiver for each RMP, to provide the simultaneous control of the closed loop operation of the individual environmental conditioning systems in each of the buildings in such a manner as to provide fail-safe control of each from the centralized location.

Computer controlled facility management system (FMS)

Electronic processing means, in combination with dedicated sensing apparatus is used to control the operation of an HVAC system which regulates the temperature in one or more temperature controlled spaces. The electronic processing means and associated sensing apparatus being readily adapted to existing HVAC systems through interface apparatus installed in each of the existing HVAC control lines associated with the HVAC sources of mixed air, hot air, and cold air, to provide selective actuation and modulation of the discharge air temperature from each source, individually or in combination, in response to sensed HVAC parameters including source discharge temperatures, space temperatures, outside air temperature, and the relative humidity of the outside air and return air from the spaces.

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Simsbury, CT, United States of America

William W Bitterli