Abstract: A device for the climate control of the passenger compartment of an automobile, including an electric fan group, an air distribution conduit in the passenger compartment which has at its entrance an air mixing shutter for diverting a variable amount of the air flow from the fan to a heating radiator, followed by a distribution shutter which sends air either to a defrosting conduit or to an conduit with outlets at the floor of the passenger compartment, electronic probes for measuring the temperature inside and outside the passenger compartment and which are connected to a microcalculator whose memory contains a formula for the interior temperature ordered as well as a law for determining flow from the fan group, both as a function of the outside temperature, the calculator being programmed for receiving temperature measurement data and processing them so as to give off output signals which depend on the temperature ordered and the measured interior temperature, signals to which respond devices for adjusting t

Abstract: Modulating system for electrically or pneumatically controlled chillers in which a sensor senses the space condition, in a controlled environment or space. Output signals from an enthalpy sensor or other sensor representing the space condition are fed to chiller modulator electronic controls and thence to the chiller modulator interface controls, be they electric or pneumatic. The sensor monitors the conditions in or returning from the controlled space or environment. By measuring both humidity and temperature, the enthalpy sensor generates an effective temperature or comfort level. The input signal from the sensor is compared to an operator adjustable set-point. If the measured condition is less than the set-point, an error signal is generated which is proportional to the difference multiplied by an operator-set sensitivity control.

Abstract: An interface circuit for adding a solar heat system to a building having a building heating and cooling system and having a building thermostat system, the interface circuit being especially wired to be compatibly interposed between the building thermostat system and the building heating and cooling system without rewiring the latter and being also connected to the solar heat system, the interface circuit thereby adding the solar system as a heat source, and the interface circuit automatically substituting the solar source for the building heating system when heat is called for at a level within the capability of the solar system to supply.

Abstract: A multi-stage condition control system of the time proportional type is shown. The control system utilizes a counting means as part of the anticipation for system control. The counting means counts during the time the control system is within its proportional band. When the control system moves outside of the proportional band, the counting stops. A count detection circuit senses the absence of counts thereby indicating that the system is outside of the proportional band. The absence of counts is then used to increase or decrease multiple stages of condition control equipment to bring the system back within the proportional band.

Abstract: An apparatus to regulate the temperature of the interior of a motor vehicle, including a room air temperature sensor and a heating air temperature sensor, with the room air temperature sensor providing a substantially higher controlled variable change per unit of temperature change and wherein the sensor signals are summed by a controller. The heating air temperature sensor consists of two series-connected temperature sensors of which one is thermally insulated. The sensor control signal is taken from the junction between these two temperature sensors so as to provide dynamic coupling of the heating air temperature sensor to the room air temperature sensor. In this manner, the room air temperature is sensed precisely and relatively more rapidly so that an excessively large fluctuation of the actual temperature is avoided if the heating output of the heat exchanger varies between a high and a low value.

Abstract: A programmable device for controlling the amount of heat supplied to a building by a circulating medium by enabling a circuit to a heater such as an oil or gas burner, or a steam valve to open and close during predetermined times and in response to the temperature of the outside air and the temperature of the medium. The predetermined times can occur during a multi-day cycle such as a week. As the outside air temperature rises and falls, the circuit will be opened or closed depending on whether the device is at a predetermined time and whether that temperature falls above or below a predetermined value and depending on the temperature of the circulating medium. Additionally, the device can be set so that when the outside air temperature falls below a predetermined level the circuit is closed to add heat to the building without regard to where in the program cycle the device is.

Abstract: A condition responsive time proportional control means which has a relatively fast time constant when operating in its proportional band has the time constant expanded by means of a digital counter. The counter is a resettable unidirectional type counter that has two counting channels. The main counting channel provides for the counting function during the normal cycling of the system when in the proportional band. A second channel in the counter acts to enable to the counter rapidly in the event that there is a disruption of the counter when the condition responsive system has been outside of the proportional band.

Abstract: A control circuit for a solar energy heating system comprising a pair of thermistors connected in series across a source of electrical power and respectively disposed to be responsive to fluid temperature in a solar collector and in a storage tank. A negative feedback high frequency oscillator which includes a Schmitt trigger is connected to the junction of the thermistors and provides a high frequency control signal having an amplitude which varies as a function of the temperature differential between the collector and tank. An electronic switch energizes a fluid pump for transporting fluid from the solar collector to the tank when the temperature at the collector exceeds that at the tank by a preselected amount.

Abstract: A temperature control is disclosed for a variable volume air conditioning system of the type wherein electric motor-operated air valve means are provided for varying the volume and relatively warm or relatively cool conditioned air supplied to a conditioned zone. The control includes zone thermostat means for producing an electrical error signal having a magnitude which varies in a predetermined relationship with respect to a deviation in zone temperature, and changeover circuit means for varying said predetermined relationship in order to accommodate changeover between heating and cooling, as sensed by duct temperature sensing means. The control further includes flow limit circuit means for imposing limits upon the maximum and minimum desired flow of conditioned air through the air valve means.

Abstract: A system for recovering the waste heat normally exhausted into the atmosphere by chemical or other processing plants. The invented system comprises a heat exchange apparatus located in the exhaust stack or flue passage, heat transfer means for carrying the waste heat absorbed from the exhaust gases to a location remote therefrom, and a second heat exchange apparatus for releasing the transferred waste heat for beneficial use at said remote location. The present invention also includes temperature and pressure control means which enhance the safety and efficiency of the system's operation. The heat transfer means disclosed in this invention is a high temperature liquid (and associated pumping and piping means) capable of withstanding temperature up to 900 F. without flashing, changing state, or corroding the heat exchange apparatuses.

Abstract: An output member of the present actuator is connected to control a temperature door in an air conditioning duct leading into an automobile passenger compartment and thereby the temperature in the compartment. The output member is connected to and moved by a diaphragm which is positioned by opposing forces of a diaphragm spring and modulated intake manifold vacuum. A valve is controlled by first and second bimetal springs which act in parallel against a feedback spring connected between the valve and the diaphragm. The first bimetal spring is responsive to air temperature in the compartment. The second bimetal spring is responsive to air temperature in the duct and compensates for variations in the operation of the air conditioning system caused by variations in load and the like.

Abstract: A package terminal air conditioning system as disclosed having a room air-circulating blower, an air-cooling device, an air-heating device, and a thermostatic control which governs operation of the air-cooling and air-heating devices in response to the temperature of room air which is circulated by the blower.The control unit senses the temperature of the air which is returned to the unit from the room and the air which is discharged from the unit to the room and operates an appropriate electrical switch to enable and disable the respective air-heating and cooling devices. The operation of the unit is such that when the temperature of the discharged air differs substantially from the temperature of the return air, the differential in the sensed room air temperature between the cut-in and cut-out of the heating or cooling device is reduced which results in minimizing the possibility of overheating or undercooling the room.

Abstract: A controller for a solar heating system includes a differential thermostat which responds to a preselected temperature differential between fluid in a solar collector and in a storage tank to operate a motor to pump fluid therebetween. The particular circuitry of the thermostat allows the use of non-linear sensing devices. Safety features includable in the controller provide for sensing of high and low extreme temperature conditions to prevent excess pressure in the storage tank or freezing of water in the collector.

Abstract: A device for controlling the heating of a hot water boiler includes a first temperature sensor sensing the temperature of the boiler liquid and operating means adapted to switch a control switch. It also includes an outside temperature sensor to be arranged elsewhere and comprising a liquid-filled reservoir which communicates via a capillary with a tubular coil spring of the control device, which spring also actuates means which are adapted to switch the first switch. The tubular coil spring is arranged to actuate with an outer winding means adapted to change, through this actuation, the relative position of elements of the control switch and hence the temperature at which the control switch is switched under the control of the first temperature sensor.

Abstract: A control device and process for heating an installation, having one zone or a plurality of zones, so that a desired temperature within the installation is attained wherein a comparison is made between the heating medium temperature and the temperature outside the installation and the results of said comparison are used to regulate the temperature of the heating medium to the lowest temperature required to maintain the desired temperature in the installation where said heating medium is constantly circulating through at least one zone of said installation and a temperature sensing means in each of said one zone or plurality of zones is activating the circulators used to circulate the thermal fluid within the installation, provided that at least one circulator will operate as long as the heating medium temperature is higher than a predetermined low temperature set point.

Abstract: An improved fan controller for forced-air temperature conditioning apparatus for buildings, such as for example, forced warm air furnaces in which the fan turn-off is controlled as a function of the difference in temperature between the plenum temperature and the return air temperature.

Abstract: A temperature control system for monitoring and controlling a zone supplied with low pressure steam is disclosed. The system comprises a series of balanced Wheatstone bridges which, when calibrated, provide a variety of manual and automatic control conditions to maintain the temperature in the zone. Means are provided for obtaining direct readings of room or zone temperature, and monitoring the position and movement of a steam control valve which is utilized as the heat metering apparatus. In order to compensate for environmental differences which may exist in various zones under control, there is disclosed apparatus for selectively varying the effect of sensors utilized in the system, and in particular, the effect of a resistance thermometer located within the zone which may be subject to variations in accuracy in terms of placement.

Abstract: Method for the controlled heating of a liquid reservoir by a heat source of varying temperature wherein the heat from the heat source is fed through a heat carrier circuit to the reservoir into a region of a heating zone thereof which extends over part of the height of the reservoir and through which the heat carrier flows from the top to the bottom thereof, so that when heated stored liquid is withdrawn from the reservoir, colder liquid flows after it into the lower part of the reservoir, which comprises measuring and comparing the temperature of the heat carrier heated in the heat source and the temperature of the stored liquid in the region of the upper part of the heating zone, and initiating circulation of the heat carrier through the circuit only when the measured temperature of the heated heat carrier exceeds a temperature selected from the group of temperatures consisting of the measured temperature of the stored liquid and a pre-set limit temperature; and storage system for carrying out the foregoing

Abstract: A control circuit for a solar heating system having a solar collector, a heating load and a heat transfer control unit, including a collector valve or damper for controlling the flow of heating fluid to and from the solar collector; a load valve or damper for controlling the flow of heating fluid to and from the heating load; a heating pump for moving the heating fluid; a heat exchanger; and a storage pump for circulating a storage fluid from a storage tank through the heat exchanger, the control circuit including a load sensor for sensing the temperature of the load; a collector sensor for sensing the temperature of the solar collector; a collector switching circuit responsive to an indication from the load sensor that the load temperature is below a preset level and from the collector sensor that the collector temperature is above a predetermined level, to open the dampers and activate the heating pump to move the heating fluid from the load to the collector to be heated and then returned to the load; a sto

Abstract: A heating system for a motor vehicle has temperature sensors for gauging the compartment temperature as well as for gauging the temperature of the effluent hot air. These sensors are connected in series, with the compartment sensor generating the more significant control signal. The flow of heating medium, for example engine water, is regulated by a valve under the control of a regulator which compares the sensors signals with a set-point value. The valve may be cyclically actuated by pulses of fixed frequency but having a width which depends on the results of the signal comparison.

Abstract: The solar heating system component combines a surge tank for a closed solar heat collecting system along with heat exchange means for transferring heat from the primary fluid in the solar heat collecting system to secondary fluid flowing in a secondary circuit which is used for a purpose such as to supply warm water, space heating or cooling and the like.

Abstract: A burner control system for a hot water boiler is responsive to both outlet water temperature and return water temperature to provide a relatively constant outlet water temperature regardless of variations in heat output requirements. A first thermistor responsive to return water temperature is effective to provide on-off control of gas flow to the burner. A second thermistor responsive to outlet water temperature is effective to vary the rate of gas flow to the burner so as to maintain a predetermined outlet water temperature. A timing circuit is effective each time the burner is turned on to delay a high rate of gas flow to the burner.

Abstract: A heating arrangement, in which the circulating heat transfer medium for radiators is heated by condensation of a refrigerant in a heat pump, is controlled by relays in the energizing circuits of the several, independently driven pumping units of the compressor in the heat pump in response to the difference between the temperature of the atmosphere outside the heated area and the temperature of the circulating heat transfer medium to reduce the pumping energy consumed in response to the rising temperature of the heat transfer medium, and thereby to improve the efficiency of the heating arrangement.

Abstract: Expansion of a fluid on increase in temperature is used to control a switch or other control output device. In one construction, two fixed quantities of fluid, separated by a flexible diaphragm, are in thermally-conductive contact with different respective regions, and change in the temperature relationship between the regions manifests itself as a change in the pressure across the diaphragm, thus displacing the diaphragm. Displacement of the diaphragm actuates a switch or a modulating control or indicating device. In other constructions, convective flow is used to influence a flow-sensitive device including a switch or a modulating control or indicating device.

Abstract: A temperature compensation system using forward biased pn semiconductor junctions as temperature sensing elements to compensate for the rate of heat loss or gain by controlling the temperature of a fluid heat exchange medium. A differential amplifier is driven by changes in the junction voltage drops and controls power to the heating element so as to maintain a controlled relation between the temperature being overcome and the temperature of the heat exchange medium.

Abstract: A heating regulator which is responsive to effective outdoor temperatures and the temperature of a heated fluid supplied by a boiler. The regulator has an adjustably positionable pointer which represents a characteristic curve. The regulator includes three slide members with the pointer being pivotally mounted on one of the slide members for a translatory movement therewith and pivotal movement relative thereto. Two potentiometers are operated by two of the slide members and one of the slide members actuates the third slide member which in turn effects pivotal movement of the pointer.

Abstract: System for recovering solar energy, comprising: collector or absorber means for radiant solar energy; a circuit with means for unidirectionally circulating the fluid heated by said collector means, heat exchanger utilization means traversed by said fluid for directly transferring the collected heat to its place of use; and means for preventing circulation when operation of the circulation control means ceases.

Abstract: A system for controlling the air and radiant temperatures, ventilation, illumination and humidity within an enclosed building is described. The system comprises a double glazed window which is transmissive to light and heat energy mounted in the wall of the building. Means are provided for measuring the net energy flow through the window and for automatically adjusting the energy flow through the window responsively to seasonal as well as weather conditions. A heat sink is thermally coupled to the building for storing some of the insolation received so that it can be released as the temperature drops in the building. The system can also include an auxiliary roof heating system. Also ventilation and humidification means for circulating and humidifying exterior air drawn into the building are provided.

Abstract: The arrangement comprises a Wheatstone bridge to which an operating potential is applied and whose diagonal is connected to a differential amplifier controlling a final control element for the temperature of the heating medium. One half of the bridge is constituted by a potentiometer, adjustable to effect parallel shifting of the controller characteristic curve, relating the outside temperature to the advance heating temperature of the heating medium, connected at a first junction point to a temperature sensitive resistor subjected to the temperature of the heating medium. The other half of the bridge is constituted by a first arm comprising a temperature sensitive resistor subjected to the outside temperature connected at a second junction point to a fixed resistor, and a second arm comprising two further fixed resistors connected to each other at a third junction point.