DE3127642A1 - Heat exchanger - Google Patents

Abstract

The present invention relates to a heat exchanger for use as cooling assembly of a conventional heat pump circuit for cooling and dehumidifying heavily polluted and dusty air, for example in a cow stable (cowshed) or poultry house (hen house, hennery), having at least one air-conditioning battery which is arranged in a box-shaped flow duct, has expanded coolant of the circuit flowing through it, and is arranged in the flow region of the air and extracts heat from the latter. The special feature of the invention is to be seen in that each air-conditioning battery is arranged spread flat in a flat space which is bounded by extremely smooth plates and surrounded on all sides and which is filled with a medium which is a highly effective thermal conductor, and in that the plates, which are exposed to the flowing air and form the front and rear sides of the space are arranged essentially vertically. As a result of this configuration of the heat exchanger, the dirt settling on the plates can flow off together with the condensed water at the latest when the heat exchanger is de-iced.

Description

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Heat exchanger

The present invention relates to a heat exchanger for

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Use as a cooling unit in a conventional / heat pump circuit for cooling and dehumidifying air that is very dirty and dusty, for example in a cattle or poultry house, with at least one in a box-shaped flow channel arranged cooling coil, through which the expanded coolant of the circuit flows in the flow area of the air is arranged and removes heat from it.

Such heat exchangers as part of a conventional heat pump cycle are well known. For example, the applicant sells a heat pump under the trademark "Hygrotherm" which is used for Stable air dehumidification and air conditioning is used. Included the heat exchanger, designed as a smooth tube evaporator made of tinned copper tube, cools the flowing through Barn air below the dew point, so there is excess Moisture from the stable air condenses and dissipates

can be. The heat obtained can for example can be used for domestic water heating.

In such a heat pump system, where on the heat exchanger the stable air, which is very dirty and jammed acts, it comes depending on the pollution of the air after a longer period of operation to a more or less strong Clogging of the heat exchanger with the evaporator deposited from the air on the cooling surfaces of the heat exchanger Dirt. As a result, the efficiency of the system drops considerably and it can even lead to a complete failure of the same come. This deficiency can only be remedied by carefully cleaning the cooling coils of the heat exchanger, which requires an undesirable additional manual labor,

It is therefore the object on which the present invention is based to provide a heat exchanger of the generic type assumed Art in such a way that it can work completely maintenance-free, i.e. it should in particular have a self-cleaning effect for the heat exchanger surfaces exposed to the polluted air are provided in such a way that the dirt deposited thereon is continuously removed and discharged automatically will.

This object is achieved in that each Cooling coil laid out flat in one of extremely smooth ones

Plates delimited, on all sides enclosed flat space (hereinafter also called "cooling plate") is arranged, which is filled by a highly thermally conductive medium, and that the exposed to the flowing air, the front and rear sides of the space-forming panels are arranged substantially vertically.

It is considered to be within the scope of this invention, the heat exchange between the "cooling plate" and the through the Alternatively, design the air flowing through the heat exchanger as follows:

a) with direct evaporation in the cooling plate,

b) with direct evaporation in the built-in refrigerant coil, which is designed as a tube in the highly thermally conductive medium,

c) Operation by passing brine liquid directly through the cooling plate,

d) Passing the brine liquid through the coolant coil arranged in the highly thermally conductive medium.

Through this design of the heat exchanger it is achieved that the condensation that precipitates on the cold, extremely smooth plates when it runs down is also there Dirt and dust settling down in the barn air carries along and thus of the heat exchange between the

Leads away refrigerant and the warm stable air causing cooling surfaces. The heat exchanger has a for the dirt and the condensation water on a suitable collecting basin or a drain below the vertically arranged smooth plates.

In a preferred embodiment of the invention, the The front and back of each flat space (the "cooling plates") are arranged perpendicular to the longitudinal axis of the box-shaped flow channel. The front and back sides fill up Each cooling plate has this flow channel except for a narrow passage, the one in the rooms arranged one behind the other is provided alternately above and below or right and left, so that the air flowing through the flow channel is guided in waves or snakes through the flow channel, i.e. its direction of flow is constantly changing »Through the repeated deflection of the air flow entrained with the dirt and dust particles will result in the deposition of the particles the damp cooling plates, since these particles are incomplete with the constant changes in direction of the air flow follow.

In the case of the highly thermally conductive medium that is in the enclosed flat spaces, i.e. in the cooling plates, together with the Is arranged cooling coils, it is, for example, a brine solution. Through this a good Vtfärme contact becomes

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between the copper pipe cooling coils and the inside of the smooth plates. The latter can be made of glass, however, other materials can also be used that have the necessary surface smoothness and corrosion resistance to avoid the aggressive vapors or gases such as ammonia and To withstand hydrogen sulfide or acetone in the long term.

It is possible to use the heat exchanger according to the invention as a "cleaning stage" before a conventional heat exchanger after upstream of the prior art discussed at the beginning in order to carry out extensive pre-cleaning and pre-drying of the dem to achieve downstream heat exchanger supplied stall air or the like.

An embodiment of the heat exchanger according to the invention is described below with reference to the accompanying drawings.

In these shows the

Fig. 1 is a side view of the heat exchanger (without side panels) with cooling plates inserted in the frame;

Fig. 2 is a plan view of Fig. 1;

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3 shows a view from the right from FIG. ₀ 1,. with the coolant coil connected. indicates is; and

Fig. 4 is a section along line A-B in Fig. 1 =

It becomes an elongated, box-shaped frame 2 for one Flow channel made of angle profiles 4 made of suitable material, such as a corrosion-resistant special .Al alloy provided. This frame comes with a suitable cladding provided (not shown) and thus forms the flow channel, which has a substantially square cross-section owns. In the exemplary embodiment, this flow channel, which is approximately square in cross section, is perpendicular to the longitudinal axis a total of 10 cooling coils 6 arranged one behind the other, these alternating a small amount upwards or downwards. are offset below with respect to the longitudinal center axis. On the front and back of the flat spiral shape Glass plates 8 of approximately square circumference, which are completely encased by U-profiles 10, are applied to cooling coils and thus form the aforementioned "cooling plates". The U-profiles are fixed inside in the frame 2 of the flow channel in such a way that the flat ones containing the cooling coils Cooling plates 10 are progressively shifted alternately up and down in the longitudinal direction, so daii

only at the top or bottom edge of each flat cooling plate, a narrow through-flow channel 12, 12 'remains free, through which the Air is fed into the next space between two cooling plates 10. This results in a wavy or serpentine flow guide 14 through the elongated, in cross section approximately square flow channel. the In this exemplary embodiment, air flows in a vertical direction on the extremely smooth surfaces of the Front and back 16, 18 of the flat cooling plates 10 along.

The cooling plates containing the refrigerant coils are filled with a suitable brine solution to ensure the best possible Allow heat transfer between the coolant coils and the inside of the extremely smooth plates. These can be made of glass or another suitable material that is sufficiently smooth and corrosion-resistant.

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Claims (9)

Protection claims (1.Heat exchanger for use as a cooling unit in a common heat pump circuit for cooling and dehumidifying air that is very dirty and dusty, for example in a cattle or poultry house, with at least one cooling coil arranged in a housing that is closed except for the inlet and outlet openings, which is connected to the The refrigerant flows through and removes heat from the air, characterized in that each cooling coil (6) is spread out flat in a flat space bordered on all sides by extremely smooth plates, which is filled with a highly thermally conductive medium, and that the exposed to the flowing air, the front and rear sides (16, 18) of the space forming panels in are arranged essentially vertically. 2. Heat exchanger according to claim 1, characterized in that the front and back (16, 18) of each flat space (cooling plate 10) is arranged perpendicular to the longitudinal axis of the housing, which is closed except for the inlet and outlet openings. 3. Heat exchanger according to claim 1, characterized in that the front and back (16, 18) of each flat space (cooling plate 10) is arranged at an angle adapted to the application to the longitudinal axis of the housing closed except for the inlet and outlet openings. 4. Heat exchanger according to claim 1, 2 or 3, characterized in that the cooling plates (10) in the housing, which is closed except for the inlet and outlet openings, are arranged one behind the other alternately above and below or left and right a narrow passage (12, 12 ' ) for air flow. 5. Heat exchanger according to one of the preceding claims, characterized in that the front and back (16, 18) of each cooling plate (10) consists of a corrosion-resistant glass plate or another suitable smooth material. 6. Heat exchanger according to one of the preceding claims, characterized in that direct evaporation takes place in the copper coils used. 7. Heat exchanger according to claim 6, characterized in that a brine liquid is passed through the built-in refrigerant coils. 8. Heat exchanger according to one of the preceding claims, characterized in that the brine liquid is passed directly through the plates. 9. Heat exchanger according to one of the preceding claims, characterized in that direct evaporation takes place in plates suitable for this purpose.