RU212350U1 - Adaptive heat recovery plant - Google Patents

Abstract

The utility model relates to agriculture, in particular to heat exchangers for providing a microclimate on livestock farms. The technical result of the device is to ensure the quality of the microclimate in the serviced premises. In an adaptive heat recovery unit containing fans of supply and exhaust air, a polymer heat exchanger made in the form of double-walled plates, a block of parallel louvres with an electric drive is installed at the outlet of the supply fan, controlled by the controller by a signal from a temperature sensor, which ensures the alignment of the swirling flow and the possibility of correcting the trajectory of the supply jet . The direction of the air flow at an angle ensures the maximum range of its distribution without changing the characteristics of the supply fan. 2 ill.

Description

The utility model relates to agriculture, namely to heat exchangers for providing a microclimate on livestock farms.

Known electrothermal recovery unit (Rasstrigin Viktor Nikolaevich, Tikhomirov Dmitry Anatolyevich, Sychkov Alexander Vasilyevich. Electrothermal recovery unit, patent RU No. 2296463), which includes an exhaust air fan, a heat exchanger made of polymeric materials, an electric fan for supply air, an electric heater for supply air, an air supply pipe, a distributor supply air, exhaust air filter, condensate drain, supply air filter, supply air duct, recirculation duct with air damper, exhaust air duct.

Closest to the claimed device in terms of essential features is a heat recovery unit (Ilyin Igor Viktorovich, Ignatkin Ivan Yuryevich. Heat recovery unit, patent RU No. 2627199), designed to provide the main parameters of the microclimate of livestock buildings required by the governing documents for various climatic zones while reducing energy costs for heating supply air.

The heat recovery unit includes an inlet opening, a supply air duct, a polymer heat exchanger, an exhaust fan, a sump with a steam trap, an intake fan, an opening with a recirculation damper, a pipeline with flushing nozzles and an exhaust air duct.

The disadvantage of the prototype is that the flow of ventilation air is supplied to the room freely in the mode of a cooled swirling jet. The cooled air is denser than the surrounding air and, under the influence of gravity, tends downwards; in a swirling jet, the velocity vector has a spatial orientation, the tangential component of which is directed perpendicular to the jet axis and causes it to rotate, this consumes part of the kinetic energy of the flow, the jet opens and extinguishes faster. These features lead to the fact that the range of the jet is reduced and depends on the temperature of the supply air, that is, the service area is ventilated unevenly in various weather conditions. At a distance from the installation, a stagnant zone is formed, and near it, an area of hyperventilation with a high air velocity.

From the analysis of known similar technical solutions, it was revealed that the technical problem in this area is the need to expand the arsenal of tools that ensure uniform distribution of supply air over the area of the serviced area.

The technical result of the device is to ensure the quality of the microclimate in the manned room without changing the characteristics of the supply fan.

To solve this problem and achieve the claimed technical result in an adaptive heat recovery unit containing fans of supply and exhaust air, a polymer heat exchanger made in the form of double-walled plates, a block of parallel blinds with an electric drive is installed at the outlet of the supply fan, controlled by the controller by a signal from a temperature sensor, providing alignment of the swirling flow and the possibility of correcting the trajectory of the supply jet. The direction of the air flow at an angle ensures the maximum range of its distribution without changing the characteristics of the supply fan.

The use of parallel shutters ensures the alignment of the swirling flow, excluding the tangential component of the velocity vector, the jet becomes more compact and the range of its propagation increases without changing the characteristics of the supply fan.

Non-isothermal jets are subject to Archimedean and gravitational forces, in particular cooled jets tend to sink as they move away from the fan. When descending, the jet collides with obstacles or the floor, which leads to its rapid extinction. However, if at the initial stage the jet is directed slightly upwards, then it will cover a greater distance before it hits an obstacle or floor. The trajectory of the cooled jet can be calculated taking into account the Archimedes criterion, and, knowing the required propagation distance (the length of the service area), make the appropriate angular correction "A / 2" to the direction of the supply air flow vector. The angle of inclination of the blinds is changed by a signal from the supply air temperature sensor, providing the maximum range of jet propagation under current conditions.

The proposed device is illustrated by drawings.

In FIG. 1 - technological scheme of the device;

in fig. 2 - schemes of propagation of cooled jets: a) aligned with a changed angle of inclination, b) swirling.

The device consists of a polymer recuperative heat exchanger with a system of air ducts 1, a supply fan 2, a block of parallel motorized blinds 3 controlled by a controller 4 on a signal from a temperature sensor 5, a tray 6 with a condensate drain and an exhaust fan 7.

The device works as follows. Ventilation air is supplied and exhausted mechanically through a polymer heat exchanger 1 by supply 2 and exhaust 7 fans. The warm air removed from the room heats the cold supply air without mixing flows through the plates separating the supply and exhaust ducts. As a result of heat exchange, the supply air is heated, while remaining cooled in relation to the room air.

The regulation is carried out by the controller 4 on a signal from the supply air temperature sensor 5. A relationship is established between the supply air temperature "t", the angle of inclination of the blinds to the horizon "β" with the proportionality factor "X". The controller 4, having received a signal from the temperature sensor 5, gives control signals to the blind drive 3. When the supply temperature is equal to the room temperature, the angle of inclination of the blinds is 0°, with a decrease in the supply temperature, the angle of inclination increases, the maximum value is 45°. The optimum tilt angle of the blinds depends on the supply air temperature and is set functionally or in the form of an adjustment table.

Compared with the prototype, the proposed device allows for uniform distribution of supply air over the area of the serviced area, regardless of weather conditions, which improves the quality of the microclimate in the serviced premises without changing the characteristics of the supply fan.

Claims (1)

An adaptive heat recovery device containing fans of supply and exhaust air, a polymer heat exchanger made in the form of double-walled plates, characterized in that a block of parallel louvres with an electric drive is installed at the outlet of the supply fan, controlled by the controller by a signal from a temperature sensor, providing alignment of the swirling flow and the possibility of correction supply jet trajectories.

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