Kaczmarek Electric S.A production halls

Type of building – Kaczmarek Electric S.A production halls.

Customer’s needs – installation of efficient heating and ventilation system for 2 production halls. Heating of special batteries zone, where the standard heaters cannot be installed. Protection of the gates against the heat losses.

Applied units – 3 OXeN–X2–N–1.2–V heat recovery units were applied in the existing hall. 6 OXeN–X2–W–1.2–V heat recovery units, 10 LEO D destratificators, 4 LEO FB 45 fan heaters, 1 LEO EX 45 fan heater, 1 gate curtains ELiS G1-W-200 and 1 gate curtain ELiS G1-N-200 were recommended for the designed hall.

Description of installation and reasons for choosing given devices – Kaczmarek Electric is a wholesale focused on sales of industrial automation and basic electric equipment.  The dynamic development of the company on the Polish and foreign markets made it necessary to expand the production hall and upgrading the existing part of the building.
In order to provide heating and ventilation, the first solution was to install the heating and ventilation units with mixing chambers, i.e. the mechanical ventilation system without heat recovery. However, these units were not able to cover the entire heat demand of the building. Their use would also require an expensive development of the boiler room, the use of roof fans and other elements that increase the cost of investment and exploitation. Therefore, the investor decided to apply the simpler solution – the ductless heat recovery units OXeN. This decision stemmed not only from the laws, which speak of the need for heat recovery from ventilated air but also of economic calculation.

Existing hall:
In the existing production hall, where the heat is supplied by LEO FL water heaters, the system was supplemented with the OXeN heat recovery units in "cold" version - without the heating function. Heat demand in this part of the building was set at 100 kW (60kW of heat losses through the walls and 40kW of heat loss associated with ventilation). By using OXeN units that provide heat recovery it was possible to recover 27.6 kW of heat. In this way, the demand of 100kW determined at the beginning dropped to 72.4 kW. Lower heat demand resulted in significant investment and operating cost savings. As a result, it was possible to buy a smaller and cheaper boiler and obtain additional space. Moreover, savings connected with the reduction of electrical power consumption, no need of roof fans which led to costly roof trims and cheaper electrical installation were obtained.
To provide the heat in the batteries zone, the LEO EX water heater in anti-explosion version was applied. This unit is designed to operate in Z-2 explosion-risk zones, in rooms at risk of explosion of gases, liquids and their fumes from IIB group of explosiveness and T3 temperature class.

Designed hall:
It is a building built from scratch. OXeN heat recovery units were installed with additional water heat exchanger for heating and ventilation. Heat demand of this part of the building was set at 150 kW (70 kW of heat loss through the walls and 80 kW of heat losses associated with ventilation). Heat recovery capacity of OXeN units is 48 kW, so the heat demand dropped to 102 kW. This solution allowed as in the case of an existing hall to significantly reduce investment and operating costs.

To fully cover the heat demand of the building, the system was supplemented with LEO FB water heaters in modulated version. Modulated system ensures automatic adjustment of heating capacities of the units to the current demand for heat which also reduces operating costs.
In order to protect the gate openings against heat losses, ELiS G air curtains  installed vertically were used,. Due to the frequent opening of the gates, the most effective solution was to use a curtain with a water heat exchanger at the bottom, and a “cold” curtain at the top to ensure suitable thermal comfort to those who work in the area. The control is provided by the regulator combined with a  door switch.

 LEO D  were used for the effective supply of the heated air to the occupied zone. They prevent the accumulation of warm air in the upper zones of the building. We recommend the installation of these destratificators in the halls, where the height exceeds 4 m. Lowering the temperature gradient thanks to the LEO D may reach 2.5°C at 1 m of height.


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