RU2279617C2 - Fan-shaped rotor heat exchanger - Google Patents

Abstract

FIELD: heat and power engineering, namely heat exchangers with movable intermediate heat transfer agent, possibly used in ventilation systems of residential, industrial rooms.

SUBSTANCE: fan-shaped rotor type heat exchanger includes rotor in the form of pack of plates uniformly distributed along circle and secured to shaft of rotor rotating in direction opposite to cooled and also to heated flows overcoming said plates through heat exchange inserts provided in them. At rotation of shaft plates are drawn together by means of restricting members placed in boundary interfaces of flows passing through heat exchanger. Revolution number of shaft is linearly depends upon flow speeds; proportionality coefficient is controlled by means of control unit on base of measured difference of initial and final temperature values of said flows at realizing function for finding maximum difference between said temperature values.

EFFECT: improved efficiency of heat exchanger.

6 cl, 3 dwg

Description

The invention relates to energy, in particular to heat exchangers with a movable intermediate coolant, and can be used in ventilation systems of residential, industrial premises.

Known heat exchangers (GB 1426971, SU 603830), consisting of a housing divided into two zones, in one of which the cooled stream moves, and in the second heated stream, a shaft with a set of disks mounted on it, which are a coolant rotating in two zones simultaneously and carrying out heat exchange between flows. However, effective heat transfer is possible only between flow layers close to the disk surfaces, and therefore the heat transfer efficiency is limited.

Known rotary heat exchangers (US 1522825, US 2337907) with disk heat transfer medium having a very large effective heat transfer area. In these heat exchangers, the coolant has the structure of a plurality of channels in the flow direction, i.e. the stream is blown through micropores. However, the value of heat transfer efficiency for them also has a fundamental limitation, since the temperature change over the flow cross section at the outlet of the coolant is different and approaches the maximum possible only for a small part of the flow.

The closest prior art to the claimed design is a heat exchanger (SU 1333970), consisting of a housing with adjacent input and output headers for passing through the heat exchanger of the heated and cooled flows, a rotor drive motor rotating counterclockwise to both flows, and discharge fans to create flows with a movable intermediate coolant, where groups of check valves are used to separate the flows. The disadvantage is the design complexity due to the use of a group of check valves.

The objective of the invention is to simplify the design and maintain the maximum for this design, the efficiency of heat transfer when changing the speed of the flows or their composition.

The problem is solved in that the fan-rotor heat exchanger, consisting of a housing with adjacent input and output collectors for passing through the heat exchanger of heated and cooled flows, a rotor drive motor rotating counterclockwise to both flows, and discharge fans to create flows with a movable intermediate coolant, equipped with plate movement limiters installed at the interface of the flow passage zones, as well as a rotor speed control unit and a sensor the inlet and outlet temperatures, and the coolant is made in the form of inserts in the plates.

In addition, the coolant inserts are made of a material with a cellular mesh structure that ensures efficient heat transfer, the plates are made of flexible elastic material, the coolant inserts are located on the plates so that when any K pieces, where K> 1, add adjacent plates, the surface does not have openings for free passage of the flow, as through the coolant insert, and the separation of the areas of the cooled and heated flows occurs due to the addition of plates on the limiters of their movement during rotation rotor, while the amount of braking created by the plate movement restraints is chosen so that at least K + 1 plates are added at the flow separation boundary to ensure maximum flow separation. The rotation speed is linearly related to the flow rate, and the proportionality coefficient between them is controlled by the control unit by measuring the initial and final temperature of any of the flows passing through the heat exchanger and realizing the function of finding the maximum difference of these temperatures to achieve maximum heat transfer between the flows.

As shown in figure 1, the heat exchanger consists of a rotor - a package of plates 4 located radially, evenly distributed around the circumference and mounted on the shaft 3, of the engine 2 mounted on the housing 1 of the heat exchanger. The input manifolds 5, 7 and the output manifolds 6, 8 are adjacent to the heat exchanger body, with fans 9, 10 installed in them, creating flows passing through the heat exchanger. At the interface between the flows installed limiters movement of the plates 11.

The plates have heat carrier inserts with a cellular structure 12 (nets - taking into account the small thickness of the plates) located on the plates in such a way that when they are combined together, the K pieces of adjacent plates, being fixed on the shaft, form a continuous surface without holes, which is necessary to separate the heat exchanger on the zones of the cooled and heated streams.

To control the flow rate and rotor speed, the control unit 15 and the temperature sensors of the flows 13, 14 are used.

The total number of plates is much larger than K. The plates are made of flexible, elastic material, as they are subject to continuous bending. Obviously, to reduce the bending of the plates, it is necessary to choose the number of plates large enough, more than 100.

The rotor rotates with an angular speed W met towards both flows, which move respectively met towards each other through the input collectors 5, 7 and output collectors 6, 8, respectively, with speeds V1 and V2 (not necessarily equal to each other). The flows created by the supply 9 and exhaust 10 fans overcome the plates through the coolant inserts. At the interfaces between the flows during rotation of the shaft, the plates are added due to the limiters 11, because to overcome the limiter, the plate must deviate and bend from its initial position. The braking value of the outer edges of the plates on the limiter is chosen so that at least K + 1 plates are folded simultaneously to reliably separate the zones of the passage of flows.

Thus, the plates move in the heated stream, gradually cooling and, conversely, vice versa, creating an almost uniform change in the temperature of the stream along the angle in the direction of rotation, as shown in Fig. 2.

The condition for the optimal shaft rotation speed W, at which the maximum heat transfer efficiency is achieved, can be written as the equality of the power needed to change the temperature of the stream from its initial temperature to the initial temperature of another stream and the power transmitted from the coolant to the stream (ideal heat exchanger), which is equivalent - the speed W should be linearly related to the speed V and the proportionality coefficient between them is regulated by the control unit by measuring the difference between the initial and final pace the temperature of any of the flows and realizing the function of finding the maximum of the difference of these temperatures. An example of the implementation of the operation algorithm of the control unit is shown in Fig. 3, where V is the flow rate by which regulation is carried out, W is the rotor speed, ΔТ is the temperature difference of the flow temperature sensors at the inlet and outlet of the heat exchanger, V0, M, ΔT0 are the variables of the algorithm , M0, dW - constant values set (or stored) in the control unit.

Claims (6)

1. Fan-rotor heat exchanger, consisting of a housing with adjacent input and output collectors for passing through the heat exchanger of the heated and cooled flows, a rotor drive motor rotating counterclockwise to both flows, and pressure fans to create flows with a movable intermediate heat carrier, characterized in that it is equipped with plate movement limiters installed at the interface of the flow passage zones, as well as a rotor speed control unit and input sensors and output temperatures, and the coolant is made in the form of inserts in the plate. 2. Fan-rotor heat exchanger according to claim 1, characterized in that the coolant inserts are made of a material with a cellular mesh structure, which ensures efficient heat transfer. 3. Fan-rotor heat exchanger according to claim 1, characterized in that the plates are made of flexible elastic material. 4. Fan-rotor heat exchanger according to claim 1, characterized in that the coolant inserts are located on the plates in such a way that when any K pieces, where K> 1, of adjacent plates are added, the surface formed does not have openings for free passage of the flow as through the coolant insert . 5. The fan-rotor heat exchanger according to claim 1, characterized in that the separation of the areas of the cooled and heated flows occurs due to the addition of the plates on their motion limiters during rotor rotation, while the braking value created by the plate motion limiters is selected so that the boundary of the separation of flows was the addition of at least K + 1 plates to ensure maximum separation of flows. 6. Fan-rotor heat exchanger according to claim 1, characterized in that the rotation speed is linearly related to the flow rate and the proportionality coefficient between them is controlled by the control unit by measuring the initial and final temperature of any of the flows passing through the heat exchanger, realizing the function of finding the maximum difference of these temperatures to achieve maximum heat transfer between flows.

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