Disk heat exchanger

FIELD: heat exchanging apparatus.

SUBSTANCE: disk heat exchanger comprises passage which receives at least one rotating rotor made of disks secured to the common shaft at a distance from each other and baffles with slots mounted inside the passage. The rotor is multistep and its disks are divided into the steps by unmovable plates. The by-pass passages are interposed between the steps. The disks are flexible, and the baffles are provided with rotatable combs.

EFFECT: enhanced efficiency.

1 cl, 2 dwg

 

The invention relates to heat exchange apparatus and can be used for heat recovery of ventilation air to transfer heat out of the air that is removed from the room air, which is served in the room).

Widely known recuperative heat exchangers surface type with stationary surfaces (tube, plate and so on).

Also known device for heat recovery ventilation with a rotating porous body, for example the heat exchanger company FRIVENT, widely represented on the Russian market [1].

However, such heat exchangers are typically used for heat recovery ventilation only at positive temperature, since at low temperatures on the heat transfer surfaces is namerzanie condensed moisture, which leads to poor heat transfer, the blocking of the channels and eventually to the complete cessation of operation of the heat exchanger.

It is also known a device for drying and cleaning air, comprising a housing with inlet and outlet nozzles, are accommodated in the housing hollow shaft with a fixed disk and a partition dividing the casing into two channels. In this device, a heat exchange occurs between the air flow, which passes through the hollow shaft, and a stream of air, transposing torque is camping disks due to friction [2].

In this device, the heat transfer coefficient is very low because of the high relative velocity of the air and drives significant only in small areas on the periphery of the disks, respectively, here the high heat transfer coefficients. For the most part drives in the paraxial region has a stagnant zone in which the relative speed between the disk and the air is practically absent and the heat transfer coefficient, respectively, is small, as is determined only by thermal conductivity of air. The amount of heat transmitted to the periphery of the disks in spite of the high heat transfer coefficient is also small, because the temperature difference between the air and the surface of the disk is small, in view of the fact that heat to the air moving inside the hollow shaft, is transmitted by conduction drive a considerable distance. Moisture condensing on the surface of the disc, the centrifugal forces cleared them that significantly reduces the rate of freezing of disks at low temperatures, but does not prevent it completely.

The closest technical solution to the declared object is disk regenerative heat exchanger, comprising a channel, which has at least one rotating rotor in the form of discs mounted on a common shaft at some distance from each other, the partitions, adelayda air streams between which heat transfer occurs, with slots, including rotating disks. In this device, the heat transfer is due to the fact that part of the surface of rotating discs are alternately in the flow of warm air, which is heated in a stream of cold air, which is cooled and give off their heat to the cold air, heating it. To reduce resistance to movement of the gas velocity of the gas is maintained close to the linear velocity of rotation of the discs to provide a laminar gas flow mode [3].

However, this leads to a decrease of the heat transfer coefficient between the discs and the gas, as it is known that the heat transfer coefficient increases with increasing relative velocity between solid and gas, and increasing the degree of turbulence of the gas stream. The difference of heat transfer coefficients in laminar and turbulent flow conditions may differ several times, respectively, to transfer the same amount of heat in laminar flow regime requires several times more heat exchange surface, which increases the intensity, cost, and size of the device.

In the device with one degree of heat transfer to the maximum possible degree of heat recovery is equal to 0.5. To increase the degree of heat recovery in the prototype variant of the heat exchanger with multiple stages of heat exchange each of which performed similarly in the form of a rotor disk, moreover, the rotors of at least two, installed in series in the direction of travel of the air and spin in the same direction.

This scheme is a multi-stage heat exchanger greatly complicates and increases the cost of construction compared to single-stage heat exchanger, for each rotor needed their support, bearings, drive, and increases the flow of air between the channels.

The basis of the invention the task is to provide a plate heat exchanger, design which could increase the heat transfer while simplifying and cheapening the construction of the heat exchanger and reduce the flow of air between the channels.

The problem is solved in that the disk exchanger, including the channel, which has at least one rotating rotor in the form of discs mounted on a common shaft at a distance from each other, the partition separating the air streams between which heat transfer occurs, with gaps, including rotating disks, according to the invention the rotor is constructed of multi-stage, for which the stack of disks is divided into stage stationary plates. Between the steps are by-pass channels, through which the air is successively sent to all stages of the rotor.

It is advisable that in the disk exchanger, according to the but to the invention, the disks were made flexible, and walls with slots for the passage of the disc rotor is constructed with a rotary dies for their input in package drives the acceleration of the rotor up to full speed.

Thus, the present invention allows to simplify and reduce the cost of construction of a plate heat exchanger as the heat exchange is carried out on the same rotating the rotor, separated by fixed plates for a few steps. By-pass channels of the heat exchanger increase heat transfer and regulation of the speed of gas flow by direction of the gas flow is opposite to the direction of movement of the drive part of the rotor speed. The implementation of flexible disks and partitions with slots for the passage of disks with rotating dies, reducing the flow of air between the channels.

The invention is illustrated by drawings. Figure 1 shows a longitudinal section of a plate heat exchanger in cross section In a-C. figure 2 shows a cross-section of the heat exchanger in cross-section A-A.

Disk heat exchanger includes a housing 1. In the building there is a rotor comprising a shaft 2, with a fixed disks 3 at some distance from each other. The fixed plate 4 divide the rotor disks in this case, the three stages of heat exchange 5. The housing of the heat exchanger is divided into two parallelepipedal 6 and 7 partitions with rotary dies 8, pivoting on the axis 9. The combs are made slits for the passage of a rotating disk.

Disk heat exchanger operates as follows.

Air flows with different temperatures come into the housing 1 and move in opposite directions: one thread from I to stage III, the air flow from III to I step. Lots of disks 3 during the rotation are alternately in different streams of air in heat, they heat up and cold stream is cooled, thus heat is transferred from the warm stream to the cold through the rotating disks. Using the fixed plate 4, the separating plate of the rotor at level 5, the air is successively supplied to different parts of the rotor. Stages of heat exchange through which air passes sequentially increase the degree of heat recovery. To increase the heat transfer coefficient between the gas and the rotor disks in the device using the highest relative velocities of the gas and drives and turbulent gas flow mode. On the first stage of the heat exchange rotating disk entice air flows in the direction of movement of the disks due to friction between the disk surface and the air and accelerate the flow. At the second stage disks are rotating against the direction of flow and inhibit them, much turbulizer, which significantly increases the coefficient of teplota is. III stage gas flows again dispersed. Due to the work of the second stage increases the efficiency of the work I and III levels, since it increases the speed of movement of the disks relative to the gas flow.

When working to a plate heat exchanger a small part of the air may flow from one thread to another through gaps between the slits of the die 8 and the disk 3. To reduce overflows can, reducing the gaps that require high precision drives and dies. However, it is known that a thin flexible disk in rotation due to centrifugal force flattens out and becomes flat. The proposed construction of the disks 3 are flexible and partitions with combs with 8 slots for the passage of the rotating discs are movable, i.e. rotating around the axis 9. When the non-rotating rotor combs 8 allocated from the rotor (figure 2 their position shown in thin lines). After the drive enable and set the nominal rotor speed floppy disks completely aligned due to centrifugal forces. Dies 8 are rotated and put in a stack of disks of the rotor, which reduces the quality requirements for the production of disks and provides minimum clearances, and hence the minimum flows between the air streams.

The proposed device provides a high heat transfer coefficient between air streams (on adca 100 W/m 2hail), which allows to significantly reduce the size and cost of the device, to realize a high degree of heat recovery possible (up to 0.8), prevents freezing of the heat exchange surfaces at low temperatures and does not require additional devices for air transportation.

The results of calculations and experiments established that terrotory disk heat exchanger of the proposed design provides a return in the winter time 70% of the heat ventilation air residential building with total area of 200 m2(performance by air 600-700 m3/h), it is at a volume of 0.2 m3and consumes about 1 kW of electricity. Saving is 6-8 kW of heat output of the heating system.

Sources of information

1. Technical data 2001, s. Heat recovery for ventilation and air-conditioning. Heat exchanger FRIVENT.

2. USSR author's certificate No. 1679142, MPK F 24 F 3/14, 01 D 47/00. B. I. No. 35, 1991

3. With the description of the invention DE No. 195 45 209 A1, MPK F 28 D 11/02, the filing date 5.12.95,

1. Disk heat exchanger, including the channel, which has at least one rotating rotor in the form of discs mounted on a common shaft at a distance from each other, the partitions with the slits set in the channel that is different is eat, the rotor is made of multi-stage, for which the disk is divided into stage fixed plate, and between the steps are by-pass channels.

2. Disk exchanger according to claim 1, characterized in that the disks are made of a flexible and walls with slits made with a rotary dies.



 

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