RU117174U1 - HEAT AND MASS TRANSFER DEVICE - Google Patents

Abstract

1. A heat-mass transfer device containing a housing with inlet and outlet pipes for supply and exhaust air, a heat-mass transfer unit located in the housing with alternating dry and humidified channels covered with a capillary-porous film and a tray with a water supply-drain system, characterized by that the heat-mass transfer unit consists of two parts, the first part contains cross-located dry channels made only of moisture-proof material, and the second part contains dry channels and adjacent cross-located channels covered with a capillary-porous film, and the dry channels the second part of the unit with supply air is connected at the inlet with the supply air supply branch pipe and connected crosswise with dry channels of the first part of the unit, which are connected to the supply air outlet branch pipe, and dry channels of the first part of the unit with extract air are connected to the room air inlet branch and connected cross with channels of the second part blocks, which are covered with a capillary-porous film and are connected to the supply air outlet. ! 2. The heat-mass transfer device according to claim 1, characterized in that both parts of the block are placed with open ends opposite to the outlet pipes of the supply and exhaust air in a moisture collection pan with a capillary porous material associated with a capillary-porous film of the channels of the second part of the block. ! 3. Heat-mass transfer device according to claim 1, characterized in that the pallet has heating devices for each of the block parts. ! 4. The heat-mass transfer device according to claim 1, characterized in that �

Description

The utility model relates to the field of ventilation and air conditioning by heat and mass transfer.

The method of heat-mass transfer in the exchange ventilation system consists in equalizing the difference in thermodynamic potentials (temperature and moisture content) of the inflow and exhaust during the interaction of immiscible air flows through a heat-conducting and moisture-permeable wall separating these flows.

In energy-efficient air-conditioning devices for heat recovery, both counter-current and cross-plate air-to-air plate heat exchangers have been used. Heat exchangers of this type are used in an air conditioning device using indirect evaporative cooling and heat and mass transfer (RF patent No. 2216694 class F24F 3/14 dated 06/28/2002). The device comprises fans for supplying the main and auxiliary flows, a housing with air inlet and outlet nozzles, a water tank in the housing with a water supply system for capillary-porous material, a heat exchange section with main and auxiliary adjacent channels, while the channels of the heat exchange section of the main stream made of moisture-proof material, and adjacent channels of the auxiliary stream of capillary-porous material.

The disadvantage of the device according to patent No. 2216694 is the inability to control the moisture content of the air supplied to the room. In winter, when the outside air has a low moisture content, the relative humidity in the room decreases, which leads to a significant deviation from the standard humidity level.

The problem of humidity control during heat and mass transfer was solved in a plant for the utilization of thermal energy in air conditioning systems (AS USSR No. 1114118 class F24F 5/00 dated 11/26/1980). The installation comprises a housing with air inlet and outlet pipes for external and exhaust air, a heat exchanger placed in the housing with alternating dry and moistened channels, an additional channel and a special supply air switching system - in summer through dry channels, and in winter through important channels in which outside air humidified and heated by the air removed by the room.

Lack of installation by a.s. No. 111418 consists in the complexity of the system for switching air flows and adapting the operating modes of the supply and exhaust fans when changing the air channels, as well as the possibility of freezing them at low outdoor temperatures due to moisture condensation in the removed air stream.

The proposed technical solution is aimed at increasing the efficiency of the heat-mass transfer device by expanding the functions performed and the range of their regulation.

This result is achieved by the following constructive solutions. one). The heat and mass transfer unit, placed in a housing having inlet and outlet inlet pipes, exhaust hoods and a tank with a water supply system, consists of two parts, each of which is a cross-precision heat exchanger. The direct-flow channels of the first part of the block are connected with the inlet pipe of the hood and the cross channels of the second part of the block, and the direct-flow channels of the second part of the block are connected with the inlet pipe of the inflow and cross channels of the first part of the block. Two lateral boundaries of the cross channels of the first part of the block are formed by partitions from the inlet side of the hood and the ends of the direct-flow channels of the second part of the block, and the cross channels are connected to the outlet pipe of the inflow. Two lateral boundaries of the cross channels of the second part of the block are formed by partitions from the inlet side of the inlet and the ends of the once-through channels of the first part of the block, and the cross channels are connected to the exhaust outlet pipe.

2). Both parts of the combined block are placed with the open ends of the cross channels opposite the outlet pipes of the inflow and exhaust into a moisture collection pan filled with capillary-porous material that closes the direct air flow between the block parts in the presence of moisture in the pan. Moisture in the capillary-porous material creates a hydraulic connection between the two parts of the heat-mass transfer unit.

3). Wet channels of the heat-mass transfer unit are formed by coating a sidewall with a hydrophilic film of capillary-porous material from a moisture-proof material of cross drawing channels. The hydrophilic film has ends (wicks) in contact with the capillary-porous material of the pallet. These wicks are used to transfer condensate to the pallet from the hood formed during cooling by adjacent cold supply air, or to transfer from the pallet and to evenly distribute moisture on the surface of the moist channel, which is supplied to the heat and mass transfer unit when operating in indirect evaporative cooling of warm supply air .

four). The pallet has heating devices for each part of the block. The heating device in the first part of the block serves to intensify the evaporation and humidification of the inflow from the open area of the porous material in the pan, and the heating device in the second part of the block eliminates the process of freezing when the moist air of the extract is cooled by the supply cold air.

5). A control valve is installed in the exhaust inlet branch pipe to the unit, which is open during operation of the heat and mass transfer unit in the supply and exhaust ventilation mode with heat and moisture recovery, and closed during operation of the unit in the supply ventilation and indirect evaporative cooling of the room with outside air.

In figures 1 and 2 shows the longitudinal section of the device of heat and mass transfer through the cross channels of exhaust and supply air when working in the exchange ventilation system. The figure 3 and figure 4 presents the cross-section of a set of plates of dry and wet channels in width and height. The figure 5 presents a diagram of the movement of air flows during operation of the device in the supply ventilation system as a regenerative indirect-evaporative air conditioner.

The heat and mass transfer device comprises: a housing with an inlet pipe 1 for external air inlet 2, an outlet pipe 3 for water supply to the room 4, an inlet pipe 5 in which a valve 20 is installed that regulates the extraction of air from the room 6, the outlet pipe 1, the exhaust air 8 , heat and mass transfer unit and pallet.

The design of the heat and mass transfer unit consists of dry channels of the second part of block 9 for supplying inflow 2 to the cross dry channels of the first part of block 10, dry channels of the first part of block 11 for supplying the exhaust 6 to cross wet channels of the second part of block 12, and also partitions 13 of the second part of the block and partitions 14 of the first part of the block.

The pan 15 is filled with capillary-porous material 16 and contains a heater of the first part of block 17, a heater of the second part of block 18, and a water supply and discharge system 19.

The proposed device for heat and mass transfer can work in the winter as a heat and moisture utilizer in a room ventilation system in an exchange ventilation system. In this case, the inlet inflow 2 is heated in the dry channels of the second part of the block 9 due to heat transfer from the exhaust hood 8 in the moist channels 12. In the cross channels of the first part of the block 11, the inlet 2 becomes the inflow 4, which is additionally heated by heat transfer from the inlet exhaust 6, and is moistened by evaporation of moisture from the surface of the capillary-porous material 16 in the pan 15. The heating device 17 allows you to increase the temperature of the moisture in the pan and intensify its evaporation. Moisture can form and drain into the pallet due to the condensation of air from the hood 8 on the surface of the hydrophilic porous film of the wet channels 12 or is additionally introduced by the feed-discharge device 19.

When installing an autonomous air conditioner that provides a room temperature lower than that of the outside air, the heat and mass transfer device works as a heat exchanger in the exchange ventilation system. In this case, the incoming inflow 2 is cooled in the dry channels of the second part of the block 9 due to heat transfer from the removed hood 8 and the cooled hydrophilic capillary-porous film of the wet channels 12, the temperature of which decreases when moisture evaporates on the surface of these channels. This moisture may be condensate produced by the air conditioner refrigeration machine (hybrid air conditioner), or it may be delivered to a pallet from an external source. In the cross channels of the first part of block 11, the supplied inflow 4 is cooled by heat transfer from the incoming exhaust 6.

With sufficiently dry outdoor air, the proposed device for heat and mass transfer can operate as a stand-alone regenerative indirect evaporative air conditioner in the supply ventilation system as follows. The valve in the exhaust inlet pipe 20 is closed and only the supply air 2 (total supply) is supplied to the device, which is cooled in the dry channels of the second part of the block 9 due to heat transfer from the cold hydrophilic capillary-porous film of the moist channels 12. Then, the supply air is separated from 2 inflow 4 without changing the moisture content in it, and the residue as a removable extract 8 penetrates the porous material 16 and enters the moist channels 12, generates cold on a hydrophilic capillary-porous film due to evaporation on n th moisture supplied from the tray 15. The condition of the organization of process regenerative indirect evaporative-evaporation is the higher pressure in the feed inflow 2 compared with removable hood 8. It is known that the optimum proportion of extract is about 1/3 of the total inflow.

The proposed multifunctional heat and mass transfer device is designed to regulate and utilize the thermodynamic parameters of air (temperature and humidity) in energy-efficient systems of exchange, supply ventilation and air conditioning of residential, industrial and agricultural premises.

Claims (4)

1. The device is heat and mass transfer, comprising a housing with inlet and outlet nozzles for supply and exhaust air, placed in the housing of a heat and mass transfer unit with alternating dry and moisturizing channels, covered with a capillary-porous film and a tray with a water supply-drain system, characterized in that the heat-mass transfer unit consists of two parts, while the first part contains cross-located dry channels made only of moisture-proof material, and the second part contains dry channels and adjacent cross-located channels covered with a capillary-porous film, and the dry channels of the second part of the unit with the supply air are connected at the inlet to the supply air supply pipe and are cross-connected with the dry channels of the first part of the block, which are connected to the supply air outlet pipe, and the dry channels of the first parts of the unit with exhaust air are connected to the inlet pipe of the air from the room and are cross-connected to the channels of the second part of the block, which are covered with a capillary-porous film and connected to the outlet pipe m inlet air. 2. The heat and mass transfer device according to claim 1, characterized in that both parts of the block are placed with their open ends opposite the outlet pipes of the supply and exhaust air in a moisture collection tray with capillary-porous material associated with a capillary-porous film of the channels of the second part of the block. 3. The heat-mass transfer device according to claim 1, characterized in that the pallet has heating devices for each of the parts of the block. 4. The heat-mass transfer device according to claim 1, characterized in that a regulator valve is installed in the inlet duct of the hood.