Electric heat curtain: advice on choice and feedback. The main disadvantages of electric heat curtains

The electric heat curtain is a device designed to protect the heated rooms from penetrating the air from the street inside. Such devices can be used year-round. In winter, they perform the functions of heat shields, because the flow of heated air inside the room does not pass the outside. In the summer, they perform similar tasks, only to keep cool inside the air-conditioned space. The electric heat curtain is mounted horizontally directly above the opening, or vertically from two or one side. Such solutions are quite relevant for shops, warehouses, kiosks, entertainment and cultural centers, and consumer services.

Benefits

In addition to the main task assigned to this equipment, it also decides a few secondary ones, including the prevention of drafts in the room, as well as the retention of dust and unpleasant odors from the outside. The electric heat curtain will protect you from annoying insects, as they simply can not get inside the room. With their help, it is possible to significantly reduce heat loss in rooms where doors are constantly opened. These are invisible devices that do not pose any danger to humans. The presence of a thermostat allows to achieve the fact that the room constantly in automatic mode maintains the optimum temperature level. These are safety devices that are immediately disconnected in case of overheating. Air-heat curtain electric prevents drafts that occur at open window or door openings with a significant difference in temperatures inside and outside the room.

Varieties

Such equipment can be of several types: mixing and sliding. The first type of curtains involves diluting cold air with a warm stream. The shirubers are placed in open apertures and exert strong counteraction by a warm air stream.

All the thermal curtains are divided into three types: electric, water and air without heating. In this case, the first type is considered. The choice of the device should be based on a whole set of parameters, the first of which is the length, then - the productivity, power, control method, type of installation and a variety of heating elements.

Length

The heat curtain is electric (prices can vary greatly depending on the brand and capacity, making at least 4500 rubles) has a length of 600-2000 mm. The most common steel devices within 800-1000 mm, which can be installed above the standard doorway. If the curtain is matched correctly, then its length should be equal to the width of the door or window opening, or slightly overlap it. In case the doorway is too large, several devices are combined to obtain the desired result. Only in this way can you be sure of the protection of the opening from the penetration of the air flow from the outside.

Performance

This parameter for any air curtain is the main one, since the speed of the air flow depends on it, as well as the optimum mounting height. For example, with the task of protecting a standard doorway with a width of 0.8-1 meters at a height of 2.0-2.5 m, the thermal curtain Electric Ballu with a flow of 900-1200 m ³ / h is an excellent tool. At the exit, the airflow velocity in this case will be 8-10 m / s, and at the floor level - 2.5-3.5 m / s. But devices with such characteristics cost 500-700 dollars or more. That is why, in order to save money, devices with weaker characteristics are often installed, which are designed to protect openings with a height of 1.5 meters. In this case, the lower part of the opening will serve as a gate to penetrate the air from outside, so the desired effect from the use of such equipment is only partially achieved. In the presence of a vestibule it is allowed to use thermal curtains of electric "Teplomash" with low efficiency, since double doors already serve as a barrier to cold air.

Installation height

In directories, this parameter is usually specified. While the height of the installation is completely dependent on the pumping and the length of the air curtain, many manufacturers specify different minimum heights for models of the same type. Domestic manufacturers usually indicate a high installation height in comparison with foreign market leaders.

Turbine

This is a rather important element of the construction of such a device as a thermal curtain. The electrical layout of the turbine assumes that it is placed along the entire length of the device. At the same time, the motor is attached to the side. Since the manufacture of a turbine with a length of more than 800 mm is a rather complicated process in terms of technology, some manufacturers have switched to the use of a technical solution with a central location of the engine, on each side of which there are two radial turbines. For example, some thermal curtains electric KEV are designed on this principle. So, the cost price of the device has noticeably decreased. However, this causes a failure in the central part of the air jet, which not only worsens the protective properties of the flow, but also causes uneven heating of the heating element. And this often leads to its damage and the subsequent failure.

Heat curtain power

In addition to the primary task of cutting off outside air, this device is capable of heating the air inside the room. For a landmark, we can assume that heating 10 square meters of a room without heating at a ceiling height of 2.8-3 meters requires 1 kilowatt of power. This is all - provided high-quality thermal insulation of the ceiling and walls, as it is almost impossible to heat a temporary room. If an electric heat curtain is installed in a well-heated room, then such a function is completely unnecessary, so you can stop the choice on the device with the lowest power, or simply an air curtain. This is due to the fact that the main functions of the device is performed by the air flow, rather than its temperature, therefore the heating power is not the most important parameter.

Type of heating elements

Here we are talking about TEN or spiral. A spiral heater is a metal wire that coils into a spiral. This element is familiar to many on domestic heaters such as "plate". The disadvantage of such a heating element is that it provides a high heating temperature, and this burns oxygen and shortens the life of the device.

TEN is a more expensive and preferred option. This is a heating element made of wire or graphite, mounted inside a hollow metal tube, the diameter of which is approximately 10 mm. Free space is usually covered with quartz sand, characterized by high thermal conductivity. In this case, it is possible to achieve a significant increase in the area of the heating surface, and this reduces the operating temperature. To further increase the heat transfer of the TEN, a strip of metal is wound around it, which makes it look like a round radiator in miniature.

disadvantages

All curtains with heating function have one feature - at the output of even the most powerful models, the air will be only warm, but not hot. For example, most often the difference in temperatures at the inlet and outlet does not exceed 21 degrees, which is easy to explain by such a high blowing speed of heating elements. That is why the thermal curtain can not replace the heat gun or any other device for heating, where the blowing speed is several times lower, and the air temperature is much higher.