4867233 Heat exchanger and method of making heat exchangers

New Patents A separate refrigeration system in a conventional refrigerator for dispensing a chilled carbonated liquid such as water or a beverage from the front door of the refrigerator and is comprised of a refrigerator having a freezer compartment wherein there is located a condenser. The condenser is interconnected with a combined evaporator-carbonator unit located in the front door. The freezer compartment accordingly acts as a heat sink for the condenser. The evaporator unit being integral with the carbonator, operates to chill the carbonator. When desirable, the condenser and evaporator can be replaced by a liquid heat transfer system having a heat absorbing coil assembly located in the carbonator and a heat dissipating coil assembly in the freezer compartment or by a constant temperature heat pipe having its heat dissipating end located in the freezer compartment while its heat absorbing end is located in the carbonator.

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held by the heated oxidized exhaust generated by such oxidation. The assembly includes a preheater and a catalytic recuperative heat generator which contains a suitable oxidation catalyst. An outside air inlet provides communication between the outside air and the heat generator. The assembly also includes a recirculation duct coupled with a fan which form a loop for storing heated oxidized exhaust for later use, and for moderating temperature losses and gains. A return duct also provides heated oxidized exhaust to the preheater. Variable flow control devices are provided at various positions within the apparatus.

4869073

HEAT EXCHANGER AND METHOD OF MAKING HEAT EXCHANGERS

AIR CONDITIONER WITH AUTOMATIC SELECTION AND RE-SELECTION FUNCTION FOR OPERATING MODES

Herman Gemeinhardt, Obernburg, Federal Republic Of Germany assigned to Akzo N V

Nobu Kawai, Satoshi Miwa, Fujinomiya, Japan assigned to Kabushiki Kaisha Toshiba

A heat exchanger comprises at least one group of tubes of thermoplastic synthetic material, the tube ends of a group being packed closely together and the tube ends of adjacent tubes being fused to one another on their end face. Preferably, the tube ends are arranged in a sleeve enclosing the group of tubes, the external tube ends being fused with the sleeve. The heat exchangers are made in such a way that the tube ends are assembled together and inserted into a sleeve. The tubes are placed in vertical position, with their ends essentially upward. Heat is then supplied to the tube ends from above, causing the tube ends to expand and occasionally to fuse with the sleeve.

A heat-pump type refrigeration cycle includes at least a compressor capable of switching between cooling and heating modes. A first memory stores first reference temperature data for the cooling mode, and second reference temperature data for the heating mode. A second memory stores first set data for setting a cooling temperature and second set data for setting a heating temperature. A mode selector compares room temperature detection data with the first and second reference temperature data, in accordance with an automatic operation instruction, and outputs a first signal for selecting the cooling mode or a second signal for selecting the heating mode. A controller sets the heat-pump type refrigeration cycle in the cooling or heating mode, in accordance with the first or second signal, and controls the compressor in a drive state or a stop state, so that a comparison difference between the first or second set data and the room temperature detection data becomes zero. A monitor is connected to monitor the stop state of the compressor, and, when the stop state continues for a predetermined period of time or longer, to provide a re-selection instruction equivalent to the automatic operaiton instruction to the mode selector.

4867949 HEAT RECUPERATIVE COMBUSTION DEVICE Erwin C Betz A combustion assembly catalytically oxidizes organic hydrocarbon gases and recovers the heat