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An aircraft having vertical takeoff and landing capability provided with at least first and second laterally extending paddle wheels rotatable on a central axis perpendicular to the longitudinal axis of the aircraft fuselage and between its nose and tail.
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| Number | Title | Issue Date |
| 7380588 | Heat pump control system and method of operating to provide automatic backup heating modes A heat pump type heating and air conditioning system includes a gas furnace or other auxiliary heat source and a thermostat and controller associated with the heat pump and the auxiliary heat source for automatically energizing the heat pump if the auxiliary heat so... | 06/03/2008 |
| 7185502 | Multi-type air conditioner and method for controlling operation of the same Air conditioner, and method for controlling an operation of the same, the air conditioner including a sheath heater in the accumulator for heating the refrigerant in room heating for delaying deposition of frost on the outdoor heat exchanger. The sheath heater inclu... | 03/06/2007 |
| 7085626 | Method and apparatus to prevent low temperature damage using an HVAC control A heating control method is provided for a multi-stage heating system including a heating circuit having a compressor, a condenser and an evaporator. An auxiliary heater is provided that is selectively controlled independently of the heating circuit. During a heatin... | 08/01/2006 |
| 6729390 | Control for heat pump with auxiliary heat source A method of controlling a heating system including at least a first stage heat pump and a second stage auxiliary heater, and a control that implements the method. The control shuts off the first stage heat pump during cold outside temperatures without the need to di... | 05/04/2004 |
| 6598671 | Hybrid heating system and method for vehicles An apparatus for heating the interior compartment of a vehicle, the apparatus has a primary heating system, a secondary heating system and an operating system. The primary heating system receives and circulates an engine coolant through a heater core. The... | 07/29/2003 |
| 6543531 | Device and method for heating and cooling a compartment of a motor vehicle A device and a method are provided for heating and cooling a compartment of a motor vehicle powered by an internal combustion engine. The device has a coolant circuit with a compressor, an ambient heat exchanger, at least one expansion device, an interior... | 04/08/2003 |
| 6176306 | Method and device for controlling operation of heat pump A method and device for controlling the operation of a heat pump having a primary heat system and an auxiliary heat system, and used to heat air circulating in an enclosure such as a building, the invention comprising a first sensor positioned in the retu... | 01/23/2001 |
| 6073690 | Heating system control unit A heating system control unit is provided for use with a heating system. The control unit includes a switching element connected to a first temperature switch associated with a first stage heater, a second temperature switch and a second stage heater of t... | 06/13/2000 |
| 5918668 | System for increasing the temperature of air initially delivered by a heat pump A system (10) for increasing the temperature of air initially delivered by an existing heat pump system (100) is provided which may be easily added to the existing heat pump system. System (10) includes a heat pump comfort controller (12) having a plurali... | 07/06/1999 |
| 5259445 | Control for dual heating system including a heat pump and furnace A programmable thermostat is provided for the selective operation either of a fossil fuel furnace or a heat pump. The thermostat is programmed to operate the fossil fuel furnace when the outside temperature is below a preselected temperature range, and to... | 11/09/1993 |
| 5070932 | Thermostat with enhanced outdoor temperature anticipation A thermostat for controlling the temperature within a space to be conditioned includes a system mode selector switch for selecting one of the heating, cooling or off modes of operation and a blower mode selector switch for selecting an automatic (cycling)... | 12/10/1991 |
| 5029449 | Heat pump booster compressor arrangement A refrigeration and heat pump system of the refrigerant gas compression type having selectively operable first and second heat exchangers, respectively, in heat exchange relationship with a heat sink or source and a heating or cooling load, and with a an ... | 07/09/1991 |
| 4948040 | Air conditioning system A duct type air conditioning system with a variable capacity blower in which the maximum blower capacity is established at initialization of the system at the optimum blower capacity. The optimum capacity is established by varying the capacity of the blow... | 08/14/1990 |
| 4852360 | Heat pump control system A control system for controlling a heating system having a heat pump and a source of supplemental heat. The indoor heat exchanger temperature is monitored, such as by a thermocouple or the like, and when the temperature falls below a given threshold level... | 08/01/1989 |
| 4805689 | Outdoor unit for a heat pump An outdoor unit for a heat pump is usable under very cold weather conditions since the outdoor unit includes an auxiliary heating system which heats a heat exchanger in order to prevent the heat exchanger from forming frost and which also compensates for ... | 02/21/1989 |
| 4598764 | Refrigeration heat pump and auxiliary heating apparatus control system with switchover during low outdoor temperature A control system for a refrigeration heat pump apparatus and an auxiliary heating apparatus has a two stage thermostat with the first stage normally controlling the heat pump apparatus and the second stage normally controlling the auxiliary heating appara... | 07/08/1986 |
| 4550770 | Reverse cycle room air conditioner with auxilliary heat actuated at low and high outdoor temperatures A self-contained window-mounted, heat/cool room air conditioner for automatically maintaining a predetermined indoor room temperature over a wide range of outdoor ambient temperatures. The air conditioner includes a reverse cycle refrigeration system havi... | 11/05/1985 |
| 4476920 | Method and apparatus for integrating operation of a heat pump and a separate heating source A method and apparatus for integrating operation of a heat pump and a separate heating source are disclosed. The combination of a heating lockout relay and an interlock relay are utilized to provide for fail safe integrated operation including providing f... | 10/16/1984 |
| 4373350 | Heat pump control/defrost circuit The present invention relates to a self-contained air conditioning unit including a reversible refrigeration system and more particularly to a control system having a plurality of sensing means that are effective in maintaining operation of the unit in a ... | 02/15/1983 |
| 4338791 | Microcomputer control for heat pump system A method of controlling energy usage of a multi-state heat pump system in which the system includes a preprogrammed microprocessor-based controller which places and maintains the system in the most energy efficient mode of operation consistent with achiev... | 07/13/1982 |
| 4332352 | Multistage thermostat using integral initiation change means A multistage thermostat is operated by comparing the thermostat setpoint and the sensed temperature over a continuous series of discrete intervals of time. When a sudden change occurs between the sensed temperature and the setpoint, the magnitude of this ... | 06/01/1982 |
| 4298056 | Heat pump setback temperature control with cold weather override A multistage timer control setback thermostat control system maintaining a normal temperature in a space and during selected time periods a reduced temperature wherein a first stage is a refrigeration heat pump, the operation of which is affected by outdo... | 11/03/1981 |
| 4178988 | Control for a combination furnace and heat pump system A control circuit for a combination furnace and heat pump wherein a temperature dependent relay is connected to a thermostat such that the heat pump is operated to supply heat to an enclosure when the outdoor temperature is above a predetermined level and... | 12/18/1979 |
| 4143707 | Air conditioning apparatus including a heat pump Apparatus are disclosed for conditioning the air within an indoor space and include first heat transfer means for selectively heating air passing to the space and a heat pump selectively operable in a heating mode, also for heating air passing to the indo... | 03/13/1979 |
