Heat exchanger

FIELD: heating.

SUBSTANCE: invention is referred to thermal engineering and may be used in district heating systems for heating service water. Heat exchanger contains primary circuit channel located between inlet and outlet connections, secondary circuit channel located between supply pipeline assembly and return pipeline assembly, heat-conducting device between primary circuit channel and secondary circuit channel, and temperature sensor. Temperature sensor is located between secondary circuit channels close to connection with return pipeline. Besides, temperature sensor contacts with heat-conducting device or situates at small distance from it.

EFFECT: space saving in heat exchanger when temperature is measured and good results are achieved.

7 cl, 5 dwg

 

The invention relates to a heat exchanger with the channel of the primary circuit, which is placed between the input and output connection, the channel of the secondary circuit, which is placed between the connection to the supply pipe and the connection to the return line, the heat transfer device between the primary and secondary circuit, and a temperature sensor.

Such a heat exchanger is used, for example, in a district heating system for heating the process water, which flows through the secondary circuit. Needed to heat the heat is supplied through the liquid coolant from the district heating network. The liquid coolant flows in the primary circuit. The primary and secondary circuits adjacent to each other in the housing to the coolant, they are in heat-conducting connection, so that the heat transfer through the heat transfer device. Similarly, by using such a heat exchanger can be heated process water for building heating, and in this case the heat source is the district heating network.

To as closely as possible to set the temperature at the outlet, the flow of the liquid coolant in the primary circuit is regulated depending on the amount of heat that is collected in the secondary circuit. Explain this on the example of the unit is eskay water, which is heated in the heat exchanger. Because water is collected in connection return pipe to the secondary circuit through the connection with the feed pipe was flowing cold water. Accordingly, in the secondary circuit migrated a sufficient amount of heat the heat transfer fluid is simultaneously must flow in the primary circuit.

To manage and even to adjust the valve that controls fluid flow in the primary circuit, in many cases, the necessary temperature sensor, which allows such regulation.

So, in WO 02/070976 A1 shows a heat exchanger called the first type, in which the temperature sensor is enclosed chamber. Inside the chamber is expanding liquid or expanding gas. A closed chamber is in heat-conducting connection with the heat exchanger. The camera can be placed either outside or inside of the heat exchanger. Here the camera operates, the temperature of the primary circuit and the temperature of the secondary circuit. Liquid or gas that is displaced from the closed chamber, acts directly on the valve to open or close it. The temperature sensor has a size that is designed for a large area of the heat exchanger. Thus, for occupancy sensor requires a relatively large space. About the especial output, necessary to control the flow of the liquid coolant in the primary circuit, in such conditions it is not so simple.

At the heart of this invention lies task is to provide a compact device for determining the temperature, which at the same time would give satisfactory results.

In the case of the heat exchanger of the aforementioned type, this problem is solved due to the fact that the temperature sensor is placed in the channel of the secondary circuit in connection with the return pipe so that it is in contact with the heat transfer device or is a short distance from him.

This construction, first, allows you to record the temperature directly at the point of connection of the channel of the secondary circuit with reverse pipeline. Thus, the sensor can determine the temperature of the process water, which flows in the channel where the ends of the heat transfer from the primary circuit to the secondary. Thus, using such a sensor can be relatively quickly and accurately to regulate the supply of heat to the fluid, which flows in the channel of the secondary circuit. The temperature sensor perceives relatively rapid changes that occur in flowing in the channel of the secondary fluid circuit, but also in the environment, in particular, in the primary circuit. These effects across the heat transfer device acting either directly on the sensor, if he is in contact with the device or with a small delay between them if there is some period. In any case provides very fast response to temperature change. A direct effect on the sensor of large masses of metal that are in the area of fittings at the accession of a return pipeline, is prevented. Large masses of metal react to temperature changes much more slowly. Accordingly, the fluid from the primary circuit to heat these fittings are not needed. For example, if the selection of the technical water from the channel of the secondary circuit has ended, the temperature sensor heats up faster, as it provides the best influence on him from the side of the primary path.

Preferably the input connection, an output connection, connection with the feed pipe and the connection with the return pipe must form the corners of a rectangle, inside which is placed a temperature sensor. This allows a simple way to ensure that the impact on the temperature sensor, primary circuit. Thus, the sensor connection to the return line is not "shielded". Because the sensor is also influenced by the temperature of the primary circuit, is achieved rapid regulation and, above all, the rapid closing of the valve in this circuit.

The fluid in the channels of the primary and the WTO the ranks circuit preferably should proceed in opposite directions. Since the temperature sensor is located near the connection of the return pipe with the channel of the secondary circuit, and the liquid in the channels is in opposite directions, the sensor also affects the temperature input connection of channel primary path. Thanks for the regulation of flow in the primary circuit can be taken into account also the influence of the temperature of the primary circuit, without the full integration of the sensor in this circuit.

Preferably the said rectangle, starting from the connection return pipe should have a longer and a shorter side, and the input connection limits the short side, and the temperature sensor is placed closer to the short side than the long. This ensures the effect of temperature on the part flowing through the primary circuit coolant, which enters the heat exchanger. Room temperature sensor with respect to the input of accession allows to estimate the influence on the temperature sensor, primary circuit.

Preferably the conductive connection between the sensor and the wall of the connection to the return line should not be. The wall of this connection is usually made of metal, for example brass. If the location of heat-conducting communication with the sensor is missing, for example, due to the fact that he is who and some distance from the said wall, it achieved immediate and relatively quick impact on the sensor side of the liquid at the exit channel of the secondary circuit. On the contrary, the influence of large masses of metal with a higher thermal inertia is reduced.

The temperature sensor preferably in the form of an electronic sensor. Thus, the electronic sensor generates electrical signals that depend on temperature. Such signals are easily processed electrical circuits, it can be used for flow control electrical circuit. You can use other types of temperature sensors.

Preferably the sensor is placed in the bore of the housing of the heat exchanger. This option positioning or mounting of the temperature sensor is relatively simple.

Hereinafter the invention is described in more detail based on the preferred examples of implementation, the description is accompanied by drawings. In the drawings shows the following:

figure 1 - schematic representation of the heat exchanger;

figure 2 - the second structural form of the heat exchanger in schematic representation;

figure 3 is a schematic depiction to explain the heat exchange;

4 is a schematic representation for explaining the position of the temperature sensor in the heat exchanger.

Schematically depicted in figure 1, the heat exchanger 1 has a housing 2, input connect the s 3 and the output connection 4 channel 5 primary circuit, indicated by solid lines, and connection to the supply pipe 6 and the connection to the return line 7 channel 8 of the secondary circuit, which is indicated in phantom lines. Channels 5, 8 are bonded to each other through the heat transfer device 9.

In figure 1 the heat exchanger shown only in schematic form. In real exchangers channel 5 primary circuit and the channel 8 of the secondary circuit is implemented, for example, in the following way: to each other are superimposed corrugated or bent sheets, resulting in cross-section occurs the honeycomb structure. In this case, some of these "cells" refer to the channel 5 of the primary circuit, the other to the channel 8 of the secondary circuit. The heat transfer device is formed by the walls of the cell.

The connection 7 is connected to point 10 selection, which in this case is represented by the valve 11. When the valve 11 is opened in the channel 8 of the secondary circuit water flows. The connection to the supply pipe, the water has a lower temperature, for example 10-15°With, at the point of selection of the water temperature should be, for example, 50°C. Accordingly, simultaneously with the selection of process water through the point selection 10 you must ensure that through the channel 5 primary circuit summed enough heat.

To regulate the flow of water in the channel 5 of the primary con is ur is a valve 12, managed by the device 13. The control device 13, in turn, receives temperature data from a temperature sensor 14, which is placed at the connection to the return line 7. When the sensor 14 is inserted into the hole 15 of the housing 2, so that it was in the channel 8 of the secondary circuit. Figure 4 this channel are denoted by the letters K, channel 5 primary circuit - letters W. figure 4 shows also the design of the heat transfer device 9. Figure 4 presents two variants of the detector 14, they are separated from each other by a dotted line. On the left side between the heat transfer device 9 and the sensor 14 has a certain gap, on the right side of the sensor in contact with the device 9. In both cases, provided the impact on the sensor temperature of the primary circuit.

As can be seen from figure 1, compounds 3, 7, 4, and 6 form the four corners of the rectangle. The temperature sensor 14 is placed within the rectangle. This drawing also shows that the rectangle has a short and long side. The short side is limited, for example, a connection 7 to the return line and the input connection 3. The sensor 14 is placed closer to the short side between the connections 7 and 3 than to the long side between the connections 7 and 4. Accordingly, although the sensor 14 are mainly influenced by the temperature to connect the research Institute 7 to the return line, it is also affected by the temperature of the liquid coolant which is supplied through the inlet connection 3. Part 5A of the primary beam 5 is depicted in such a way that it passes near the sensor 14. Accordingly, by heat conduction to the sensor 14 to a certain extent also influenced by the temperature of the liquid flowing in the primary circuit. Thermal radiation plays a minor role.

The temperature sensor 14 is in the form of an electronic sensor. In the simplest case, we are talking about the PTC resistors whose resistance varies with temperature. Of course, you can also use semiconductor sensors, the characteristics of which vary with temperature.

Determined by the temperature sensor 14 analyzes the control device 13, which depending on the temperature controls are located at the output connection 4 valve 12.

The temperature sensor 14 a lot of space is not, therefore, when using such a sensor 14 overall dimensions of the heat exchanger 1 increase slightly. The sensor 14 is not shielded by the connection 7 to the return line. It is preferable to place it at an angle of between 45° to 90° to the line connecting the connection 7 and the connection 4, or at an angle from 0 to 45° to the line that connects the compound 3 and compound 7. From this angle, Nar is do with other factors, depends, how much will be affected by the temperature of the primary circuit to the control valve 12.

Figure 2 shows a slightly modified construction of the heat exchanger 1. The same and corresponding elements are the same as in figure 1.

Unlike execution in accordance with figure 1, the sensor 14 in this case are not made in the form of an electronic sensor, and in the form of a thermo sensor. It contains content, the volume of which varies with temperature. The temperature sensor 14 through the capillary tube 16 is connected to the valve 12.

Otherwise, the temperature sensor 14 is exactly the same as shown in figure 1.

Another difference is that the inlet connection 3 and the output connector 4 is placed with the same side of the housing 2. On the opposite side is the connection 6 to the supply pipe and the connection 7 to the return line of the channel 8 of the secondary circuit.

From the comparison figa and 3B it is seen that the normal presentation of the dead time Td(see figa), which takes place before the start of the response to changes in temperature, is reduced almost to zero (pigv). This is because the temperature sensor 14 is placed directly in the fluid flow, which flows in the secondary circuit, and without contact with large masses. If the space temperature sensor 14 (natures the NGOs, you can use several sensors) response to temperature change occurs much earlier, depending on the distance to the primary circuit in the regulation can involve this path.

In the area of the connection has a large mass of metal and liquid. At this point, the temperature will gradually increase. However, if the temperature sensor 14 is placed at some distance from the fitting, the need for heat from the primary circuit to heat this buffer will disappear.

1. The exchanger with the channel of the primary circuit, placed between the input and output connection, the channel of the secondary circuit, placed between the connection of the feed pipe and the connection with the return pipe, the heat transfer device between the channel of the primary circuit and the secondary channel of the circuit, and a temperature sensor, wherein the temperature sensor (14) is placed inside the channel (8) of the secondary circuit at the connection (7) with the return pipe so that it is in contact with the heat transfer device (9) or is a short distance from him.

2. The heat exchanger according to claim 1, characterized in that the inlet connection (3)output connection (4), the compound (6) with feed pipe and the compound (7) with return ducts form the corners of a rectangle, and a temperature sensor (14) pomeshennoy of the quadrangle.

3. The heat exchanger according to claim 2, characterized in that the flow channel (5) primary circuit and the channel (8) of the secondary circuit are directed in opposite directions.

4. The heat exchanger according to claim 3, characterized in that the specified rectangle, starting from compound (7) return pipe, has a longer and a shorter side, and the inlet connection (3) limits the short side, and the temperature sensor (14) is placed closer to the short side than the long.

5. The heat exchanger according to any one of claims 1 to 4, characterized in that the temperature sensor (14) is not in heat conducting relation with the wall of the compound (7) with reverse pipeline.

6. The heat exchanger according to any one of claims 1 to 4, characterized in that the temperature sensor (14) is made in the form of an electronic sensor.

7. The heat exchanger according to any one of claims 1 to 4, characterized in that the temperature sensor (14) is placed into the hole (15) of the housing (2) heat exchanger (1).



 

Same patents:

FIELD: mechanical engineering; heat exchanger equipment.

SUBSTANCE: invention relates to multistage heat exchange device containing primary and secondary circuits to provide heat exchange in which heat carrier passes in opposite directions. According to invention, primary circuit has at least two points of supply of heat carrier displaced relative to each other in direction of flow. Said device contains also system of valves interacting with temperature sensors and regulating heat carrier flow through primary circuit. Valve gear for each heat carrier supply point has separate valve.

EFFECT: provision of stable control of temperature at output of secondary circuit.

5 cl, 3 dwg

FIELD: systems for automatic control of technological processes for cooling natural gas with use of apparatus for air cooling, possibly in after-compressing stations of gas fields in northernmost regions for sustaining optimal operation modes of air cooling apparatus for natural gas.

SUBSTANCE: system includes frequency-controlled drive unit; unit for processing measurement information and for automatic control; temperature pickups; electronic unit of temperature pickups; computing unit; two actuating devices; blowers. Signals of temperature pickups are fed through electronic unit to unit for processing measurement information and for automatic control. Said unit for processing measurement information judges (on base of inlet signals) what blowers are to be used and sends respective electric signal to computing unit. With the aid of computing unit one actuating device turns on electric motors of blowers due to their alternative connection with frequency-controlled drive and connects with AC-source electric motors of blowers. Other actuating device controls temperature of walls of heat exchange tubes in all sections of air cooling apparatus of gas and connects with frequency-controlled drive electric motor of blower of that section where temperature of walls of heat exchange tubes differs from preset value. After achieving preset temperature value of walls of heat exchange tubes of selected section, apparatus turns off electric motor of blower from frequency-controlled drive and switches it to AC source. Similar operations may be realized for electric motors of blowers if necessary.

EFFECT: simplified system for automatic control of apparatus for air cooling of natural gas.

1 dwg

FIELD: heating systems.

SUBSTANCE: method comprises control of temperature of at least one of secondary flows of fluid in the secondary circuit which outflows from heat exchanger (1) by means of the primary flow in the primary circuit with the use of control members (5) and (11) that control the primary flow under the action of control unit (7), determining the difference of enthalpies of the primary flow that enters heat exchanger (1) and primary flow that leaves heat exchanger (1), measuring the secondary flow, measuring the flow in the primary circuit, and sending the parameters determined to control unit (7) for control of control members (5) and (11). As a result, the primary flow is controlled by the secondary flow so that the power supplied to the heat exchanger with the primary flow is, in fact, equal to the sum of the power required for the heating of the secondary fluid from the initial current temperature up to the specified outlet temperature, power required for the compensation of energy stored in heat exchanger (1), and power losses from heat exchanger (1). The description of the device for control of water temperature is also presented.

EFFECT: enhanced reliability.

13 cl, 9 dwg

FIELD: heating engineering.

SUBSTANCE: space where surface of condensation locates is brought into communication with steam source and with atmosphere. Heat from surface of condensation is removed to group of individual heat consumers in such a way that heat comes to one group of consumers after another group is supplied with it due to the fact that space where surface of condensation locates is separated to a number of cavities relating in series to each other. The cavities form channel, which communicates steam source with atmosphere. Heat from parts of surface of condensation disposed at different cavities is removed separately each from another to different consumers. Device for realization of the method has vapor source connected with inner cavity of heat-exchange apparatus. The inner cavity communicates with atmosphere. Inner surface of heat-exchange apparatus communicates with atmosphere through internal cavity of at least one more heat-exchange apparatus. Heat-exchange apparatuses are connected with heat agent carriers of different consumers of heat. Internal surfaces of heat-exchanges apparatuses form at least one channel elongated in vertical direction.

EFFECT: selective heat supply from surface of condensation.

4 cl, 3 dwg

The invention relates to the field of water supply and heat and can be used in systems backbone networks water and heating

The invention relates to the regulation of the mode of heat exchangers operating in cyclic mode switching threads, and can be used to stabilize the switching temperature regenerator units for separation of gas mixtures by the method of deep cooling

The invention relates to the field of power engineering, and in particular to methods of distribution teplocomplete between the economizer and the air heater and can be used for cost optimization when designing boilers

The invention relates to the field of technical diagnostics, in particular to control the degree of clogging of the heat exchangers in the instrument Cabinet with liquid cooling

The invention relates to refrigeration, and in particular to methods of manufacturing devices with improved technology in the Assembly

FIELD: mechanical engineering; air conditioning and ventilation.

SUBSTANCE: invention relates to heat exchange devices used in air conditioning and ventilating plants, namely, to methods of evaporating cooling to dew point and to plate devices for evaporative cooling. According to invention, plates of plate device are made so that channels and perforation to pass from dry side to wet side can be at least partially wetted with evaporating liquid. Chute is provided made in part of plates which temporarily holds evaporating liquid in contact with wick material on surface of wet side of plate. Evaporating liquid flows along chute through perforation for liquid into following chute. When chute of plate from wet side is from above, perforation for liquid is on side forming reservoir for wetting opposite wick materials. When flow move along dry side, heat is conveyed to plate. In proposed method several heat transfer plates are used. Said plates have wet and dry sides and they form chutes. Plates are wetted form wet sides with evaporating liquid and they pass separately two flows, namely, working and product ones through dry sides. Flow of working gas passes along dry side and gets through perforation into channels on wet side which is cooled owing to evaporation, thermal conductivity of plate and its heat radiation.

EFFECT: provision of more effective air flow and heat transfer owing to evaporative cooling with intermediate coolant.

FIELD: gas turbine construction.

SUBSTANCE: matrix can be used in heat exchangers of heat regeneration heat system's exchanger, as well as for warming up (cooling down) gas or liquid in different heat-sing installations. Matrix of ring-shaped lamellar heat exchanger has heat-exchange members formed by lamellar plates with corrugated parts and openings of collectors, which are connected by means of lugs of internal and external diameters of plates or by means of lugs of collectors. Corrugated parts and collectors are limited by internal and external diameters of ring-shaped plate, or by lines being equidistant to them, and by frontal planes being parallel to axis of symmetry of corrugated parts. Axes of symmetry of any part and of collectors pass through center of plate. Angles between frontal planes of distributing and gathering collectors are equal to each other. Vertexes of angles are disposed at concentric circles having the same or different radiuses. Area of distributing collector relates to gathering collector is directly proportional to relation of corresponding radiuses of vertexes of angles and belongs to 0,4-0,8 interval.

EFFECT: improved efficiency of operation of heat exchanger.

2 cl, 7 dwg

FIELD: agriculture: heat engineering equipment for poultry and stock-rearing.

SUBSTANCE: the invention is dealt with the field of agricultural heat engineering equipment ensuring a heat transfer from one heat-exchanger to another in presence of aggressive corrosion-influencing components in one of them. The equipment may be used in the gas-air ventilation facilities of heat recovery in poultry and stock-rearing farms. The method of production of a cross-running heat exchanger out of a polymeric material containing a package made out of polymeric cellular plates bound to each other and encased in a box ensuring an inlet and an outlet of warm and cool air streams. At that the cellular plates located in one direction in a package are bound to each other by a two-sided polymeric adhesive tape through gaskets made out of the same polymer and placed along the surface and perpendicularly to directions of cells in a plate, are kept till full polymerization of the joints with following formation of the package on all its corners with metal angle sections into a rigid metal framework. At that in one of the vertical sides of the angle section they drill some bores ensuring a free running of a liquid. Then using a sliding fit the package is inserted in the guides made out of the angle sections and mounted perpendicularly to the corners of the air-distributive box so, that the bores of the lower corner of the package meet the bores of a lateral wall of a guide. The package is fixed in the guides formed by the metal angle sections. The bores of the lower angle section of a guide should be located opposite to the bores drilled-in in the lower wall of the air channel of the box placed above a draining container. The invention ensures the necessary tightness of the channels linking the heat exchangers, possibility to use the heat exchangers at low temperatures and also to increase the cost efficiency of the polymeric material cutting.

EFFECT: the invention ensures the necessary tightness of the channels linking the heat exchangers, possibility to use the heat exchangers at low temperatures and increased the cost efficiency of the polymeric material cutting.

2 dwg

The invention relates to heat-exchange equipment, implements the exchange of thermal energy between the two working environments through the wall, and can be used in ventilation systems and air conditioning for the heat exchange between the supply air and exhaust air

The invention relates to shipbuilding, and directly to the ship exchangers for heating of supply air

The heat exchanger // 2052757
The invention relates to a surface gas-liquid or gas-air heat exchangers, such as a regenerator for gas turbine engines

The heat exchanger // 2047076
The invention relates to a heating engineer, and in particular to heat exchangers, such as radiators, cooling systems of internal combustion engines
The invention relates to heat exchangers in which the channels for the coolant is formed by a plate separating the two media, i.e

FIELD: agriculture: heat engineering equipment for poultry and stock-rearing.

SUBSTANCE: the invention is dealt with the field of agricultural heat engineering equipment ensuring a heat transfer from one heat-exchanger to another in presence of aggressive corrosion-influencing components in one of them. The equipment may be used in the gas-air ventilation facilities of heat recovery in poultry and stock-rearing farms. The method of production of a cross-running heat exchanger out of a polymeric material containing a package made out of polymeric cellular plates bound to each other and encased in a box ensuring an inlet and an outlet of warm and cool air streams. At that the cellular plates located in one direction in a package are bound to each other by a two-sided polymeric adhesive tape through gaskets made out of the same polymer and placed along the surface and perpendicularly to directions of cells in a plate, are kept till full polymerization of the joints with following formation of the package on all its corners with metal angle sections into a rigid metal framework. At that in one of the vertical sides of the angle section they drill some bores ensuring a free running of a liquid. Then using a sliding fit the package is inserted in the guides made out of the angle sections and mounted perpendicularly to the corners of the air-distributive box so, that the bores of the lower corner of the package meet the bores of a lateral wall of a guide. The package is fixed in the guides formed by the metal angle sections. The bores of the lower angle section of a guide should be located opposite to the bores drilled-in in the lower wall of the air channel of the box placed above a draining container. The invention ensures the necessary tightness of the channels linking the heat exchangers, possibility to use the heat exchangers at low temperatures and also to increase the cost efficiency of the polymeric material cutting.

EFFECT: the invention ensures the necessary tightness of the channels linking the heat exchangers, possibility to use the heat exchangers at low temperatures and increased the cost efficiency of the polymeric material cutting.

2 dwg

FIELD: gas turbine construction.

SUBSTANCE: matrix can be used in heat exchangers of heat regeneration heat system's exchanger, as well as for warming up (cooling down) gas or liquid in different heat-sing installations. Matrix of ring-shaped lamellar heat exchanger has heat-exchange members formed by lamellar plates with corrugated parts and openings of collectors, which are connected by means of lugs of internal and external diameters of plates or by means of lugs of collectors. Corrugated parts and collectors are limited by internal and external diameters of ring-shaped plate, or by lines being equidistant to them, and by frontal planes being parallel to axis of symmetry of corrugated parts. Axes of symmetry of any part and of collectors pass through center of plate. Angles between frontal planes of distributing and gathering collectors are equal to each other. Vertexes of angles are disposed at concentric circles having the same or different radiuses. Area of distributing collector relates to gathering collector is directly proportional to relation of corresponding radiuses of vertexes of angles and belongs to 0,4-0,8 interval.

EFFECT: improved efficiency of operation of heat exchanger.

2 cl, 7 dwg

Up!