RU2247911C2 - Plate heat exchanger for recuperation of heat energy - Google Patents

Abstract

FIELD: ventilation, air conditioning and waste recovery of exhaust air.

SUBSTANCE: the recuperative plate heat exchanger consists of porous plates with ribs, the plates are made of capillary-porous wettable plastic, and the ribs are made integral with the main surface of the plates in the form of stiffening ribs parallel with the air flows and made up perpendicularly to one another in deferent ducts, the plates are installed both vertically and horizontally.

EFFECT: simplified and cheapened the construction of the heat exchanger, adaptability of its manufacture and enhanced efficiency.

Description

The invention relates to the field of ventilation, air conditioning and heat recovery of exhaust air.

The USSR author's certificate No. 937956 “Plate heat exchanger package” is known. The package contains flat sheets, the opposite edges of each of which have flanges in opposite directions, included in the flanges of an adjacent sheet, and corrugated inserts placed between the sheets. The sheets are made of rectangular water-conducting materials, and flat gaskets are placed between the sheets at an angle of the package with a gap relative to the corrugated inserts.

The disadvantages of this device are the low stiffness of the package, the complexity of the design and manufacture.

The closest in technical essence and the achieved result to the claimed device is a plate heat exchanger for the recovery of thermal energy in air conditioning and ventilation systems. For example, described in “PWT. Design, Installation and Operation Manual ”published by Novalwezk AG, Liechtenstein, 1997 (prototype). In the heat exchanger, the plates are made of metal or solid moisture-proof plastic, have a complex shape to increase heat transfer, are enclosed in a cage, usually plastic, providing cross current in the heat exchanger. Plates are mounted vertically to allow condensate to drain.

The disadvantages of the latest design of the recuperative plate heat exchanger are the complexity of the design and manufacturing technology, low efficiency and high cost, lack of moisture capture.

The main objective to which the invention is directed is to simplify the design and manufacturing technology for mass production, capture not only heat but also moisture (latent heat), increase the efficiency and reduce the cost of the structure. As a result, the problem of replacing a metal heat exchange surface with a plastic one is solved, which contributes to the widespread use of heat traps in ventilation and air conditioning systems. The problem of energy saving and ecology is being solved more effectively.

The specified technical result is achieved by the fact that in the regenerative cross-precision heat exchanger, the plates with stiffeners are made of porous wettable plastic (for example, miplast). The ribs are made whole with plates. When condensate precipitates, such plates are wetted, increasing thermal conductivity, and, at the same time, let moisture pass into the dry channel of the supply heated air, thereby carrying out moisture collection and increasing the efficiency of heat collection due to the transmitted “latent heat”.

In the dry heat-collecting period, there is also the transfer through the plates of moisture simultaneously with heat in the form of water vapor, which also increases the thermal conductivity of the material of the porous plastic (for example, miplast), since this material is a capillary-porous body and its moisture content increases with increasing relative humidity of air. In a dry supply duct, the air always has a lower moisture content than in the exhaust. As a result, under the influence of the difference of the partial pressures of air in the channels, moisture in the form of water vapor passes into the supply air. This circumstance also increases the efficiency of heat transfer. The plates are installed both vertically and horizontally, as the main moisture passes into the dry channel.

Comparison of the claimed technical solution with the prototype allows you to establish the presence of distinctive features and compliance with the criterion of "novelty."

Comparison of the proposed technical solutions with other known solutions allows us to conclude that there is an inventive step, since the authors are not aware from the scientific, technical and patent literature of the use of the plate heat recovery heat exchanger in the form presented.

The device diagram of the plate recuperative heat exchanger is shown in the drawing. It consists of a plate 1 with stiffeners 2, integral with the main surface. The ribs are made parallel to the flows of air outside 3 and discharged 4 and are made perpendicular to each other in different channels.

The heat exchanger operates as usual: warm air is emitted through one channel and cold outside air is passed through the other.

A distinctive feature of the proposed heat exchanger can be considered the possibility of its installation with the arrangement of the plates horizontally, since the bulk of the moisture passes through the plates into the dry channel of the outside air. The horizontal arrangement of the plates is more convenient in the manufacture of the recuperator, structurally and reliably during its operation.

Claims (1)

A recuperative plate heat exchanger consisting of porous plates with fins, characterized in that the plates are made of capillary-porous wettable plastic, and the fins are made integral with the main surface of the plates in the form of stiffeners parallel to the air flows and arranged perpendicular to each other in different channels, moreover plates are installed both vertically and horizontally.