Energiagazdalkodasi Intezet

Transelektro Magyar Villamossagi Kulkereskedelmi Vallalat

Arpad Bakay

Gyorgy Bergmann

Janos Bodas

Istvan Papp

Geza Hivessy

Gyorgy Palfalvi

Laszlo Heller

Laszlo Forgo

Zoltan Szabo

Gyula Kovacs

Mihaly Horvath

Istvan Szentgyorgyi

Tamas Homola

Heat exchanger apparatus which includes a substantially horizontal countercurrent heat exchanger of the shell-and-tube type, particularly for hybrid heat pumps operated with non-azeotropic work fluids. The apparatus further includes fluid distributor with fluid outlets the number of which corresponds to the number of the heat exchanger tubes of the heat exchanger is provided upstream the heat exchanger, the heat exchanger tubes of which are connected each to one fluid outlet of the fluid distributor.

Heat exchanger apparatus, particularly for hybrid heat pumps operated

In a cooling apparatus operated by ambient air and an agent to be cooled which can have solid state at atmospherical temperatures, a housing such as a cooling tower (100) with air inlets and air closure means at the air inlets and large surface heat exchangers (3) arranged within the cooling tower (100) at its air inlets and divided into groups or sectors being in parallel connection are provided, with which the agent is cooled by the air streaming through the large surface heat exchangers (3). At least one pre-heating heat exchanger (20) is arranged in the air space (29) of each sector of the large surface heat exchangers (3), and the pre-heating heat exchangers (20) are in parallel connection with the large surface heat exchangers (3) of each sector.

Cooling apparatus

A hybrid heat pump wherein the operating medium is a mixture of media which dissolve in each other and have different boiling points. The condensation and/or the evaporation is performed on more than one pressure levels and at variable temperatures. The compressor performs the suction on more than one pressure levels and performs the discharge on more than one pressure level. Between low pressure operating medium (p.sub.1, p.sub.2) and large pressure operating medium (p.sub.3, p.sub.4, p.sub.5) the heat transfer is performed by the internal heat exchangers.

Multi-stage heat pump of the compressor-type operating with a solution

A helicoidally finned tube for use mainly in heat exchangers. The tube comprises a cylindrical tubular member which carries or is integral with a helical member the turns of which form the fins of the tube. The fins are provided with ripples which extend from the outer rim of the fins inwardly and the depth of which diminishes toward the tube center. The ripples serve for diverting a cooling medium inwardly to hotter parts of the tube thereby improving its heat transfer performance. The helicoidal member has rippled sections alternately with level sections, the rippled sections subtending an angle not exceeding about 90 degrees and both types of sections on successive turns registering with one another in the direction of the axis of the tubular member. The spacing of the sections is substantially equal to a quarter of the circumference of the tubular member so that the rippled sections of the helicoidal member occupy diametrically opposed positions on the tubular member, the ripples being disposed generally transverse to the direction of airflow. The ripple-free sections, thus positioned, facilitate removal of impurities precipitated in the fin gaps (FIG. 9).

Helicoidally finned tubes

The difference in density between heated and unheated air is used to provide flow of air across a heat transfer means located underground. An underground passageway connects an inlet orifice with an outlet orifice for flow of ambient air therethrough. The passageway comprises at least one essentially vertical shaft, said vertical shaft terminating at the outlet orifice and containing proximate its lower end said heat transfer means.

Air operated underground cooler means with natural lift

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Budapest, Hungary

Arpad Bakay