Roof Type Package Air Conditioners-22846
Product Code: 24
Alp Package Type Rooftop Air Conditioner Systems
Roof Type Package Air Conditioners (Rooftop Systems)
In roof type package air conditioners, which are also called Rooftop air conditioners, the inner and outer units are turned into a single unit. It has not any second unit. It is preferred due to some reasons such as the fact that it takes a small space and has a high air flow rate. They operate by electricity. They have heating and cooling functions. As an option, a Water heating battery can be added. It is possible to distribute conditioned air to the desired spaces, by means of the air ducts. They can operate with recycled ambient air as well as 100% fresh air.
The rooftop package air conditioners produced in our factory in Istanbul are the units that can be designed as equipped with heating pumps, in order to meet the air conditioning requirements of some places such as shopping centers, supermarkets, cinemas, offices, restaurants, social facilities, training rooms, and workshops.
Package type air conditioning devices are made of galvanized sheet with electrostatic paint, as suitable for outdoor installation. The part in contact with conditioned air is made of metal surfaces, which are easy to reach and completely cleanable; and which minimize heat loss in outdoor environments, and are insulated with intent to prevent condensation both in and out of the device.
A wide range of accessories are available for each size, and they can be assembled in different configurations, in order to fulfill the installation requirements. The series has SCROLL compressors, each of which is located on the independent cooling circuit. Thus, even in partial loads, the ratio between the total and felt cooling capacity is ensured to remain constant. It ensures the air to be conditioned better and more efficiently. Each cooling circuit is equipped with two thermostatic expansion valve intended for optimization of the two working circuit.
In Alp rooftop air conditioners, gas heating system are used as well, as an environment friendly alternative to hot water battery or electric heating options. Gas models are designed for the use of natural gas or LPG.
The units are equipped with R410A liquid refrigerant. All the versions are delivered as assembled and factory-tested packaged units.
Fans
Radial Fans
EUROVENT and AMCA certified radial fans used in Alp central-station air handling units are used with optionally forward or backward curved blades depending on the required capacity. Double suction radial fans are used with additional filtering elements.
Radial fans are produced as belt-pulley driven devices with galvanized metal sheet body in spiral form. The fan rotor is statically and dynamically balanced. The electric motor is mounted on a specially designed belt tensioning mechanisms.
Pulleys are equipped with conical clamping bush. The connection between fan discharge outlet and cell panel is provided by means of a connector. Fan, motor and belt tensioning mechanism are fixed on a reinforced C profile chassis. In addition, whole the moving system is mounted on spring or rubber insulators. Radial fans used in Alp central-station air handling units can be taken out from the side.
In Alp central-station air handling units, frequency converters suitable or radial fan motors can be applied separately if desired. Illumination of the fan cell is provided by controlled hermetic luminaires.
Plug Fans
In our Alp central-station air handling units, optionally plug fans are preferred because of the fact that they are easy to clean and prevent accumulation of dust on the surfaces. Depending on the characteristics of air flow rate-pressure, plug fans are applied as directly coupled or belt-pulley driven.
Plug fans used in Alp central-station air handling units are fans with backward curved blades. Rotor is mounted directly on the motor shaft. Whole the moving system is mounted on spring or rubber insulators. Plug fans used in Alp central-station air handling units can be taken out from the side.
In Alp central-station air handling units, frequency converters suitable or plug fan motors can be applied separately if desired Illumination of the fan cell is provided by controlled hermetic luminaires.
Panels
Specially extruded aluminum profiles and double-walled 45-60 mm thick panels with polyurethane filling or rock wool insulation are used in the cabin construction of Alp central-station air handling units. Exterior surfaces of the panels are produced of galvanized metal sheet coated with PVC or anti-static paint. Panels are connected to profiles with special screws; and neoprene seals are placed between the panel and profile. A smooth surface is provided, by applying liquid silicone to the joints.
Cell
Cells used in Alp central-station air handling units are produced of specially extruded aluminum profiles and double-walled 45-60 mm thick panels with polyurethane filling or rock wool insulation. On the cells, there are coarse filter, bag filter, fan, aspirator, heater, cooler, humidifier, heat recovery device, sight glass intended for control and maintenance of some elements such as fans, hinged, handled and security-controlled doors. In addition, internal lighting fixtures are used.
Cells are produced as with a structure that can be connected to each other from their insides by means of high strength fittings, with suitable bolts and nuts.
Intervention Doors
Intervention doors of Alp central-station air handling units are produced of specially extruded aluminum profiles and double-walled 45-60 mm thick panels with polyurethane filling or rock wool insulation. In intervention doors of all our central-station air handling unit models are equipped with strength and durable door handles and hinges with the feature of compression that provides leak-tightness.
And in intervention doors of some element such as coarse filter, bag filter, fan, aspirator, heater, cooler, humidifier, heat recovery device, and fan, there is a sight glass allowing for their control and maintenance.
Filters
In our central-station air handling units, G3 and G4 class filters that can be classified as roughing filter are placed at the suction side of the fan, immediately after the assembly of the air inlet. F7 and F9 class precision bag filters and compact filters are place at the pushing side of the fan, after a cell with deflector.
And U.V disinfection filter is placed after the bag and compact filters.
Filters have compression equipment and frame structure that is easy to remove and assemble.
Filter housings, where filter frames are placed, are equipped with sealant gaskets. Filter frames are placed in such as way as to be mounted on the gaskets.
Pre-Filter Cell
Cassette panel filters used as controlled and renewable pre-filters in Alp central-station air handling units are made of a special blend of crude fibers. Cassette filters have an extremely durable structure. Its surrounding protection cage is placed in order to protect its filtration feature from strokes. Cassette panel filters are the filters in class G2 (EU2) - G3 (EU3) - G4(EU4) - F5 (EU5). Cassette filters used in Alp central-station air handling units are produced as cellulose-based and fiberglass-based.
Precision Filter Cell
Bag and compact filters used as a precision filter in Alp central-station air handling units are made of synthetic fiber material, and show a superior performance with their high dust collection capacity. Bag filters usually produced with a depth of 500 and 600 mm are also produced in specific sizes. Bag filters made of synthetic fiber are used in ventilation systems. And in hygienic air-conditioning system, they are mounted inside of the central-station air handling unit, with intent to protect the HEPA filters. Synthetic fiber bag filters make filtration in the classes G3 (EU3) - G4 (EU4) - F5 (EU5) - F6 (EU6) - F7(EU7) - F8 (EU8)- F9(EU9) class.
Active Carbon Filter Cell
Active carbon filters used in Alp central-station air handling units have the feature of capturing gas molecules. A surface of the active carbon filters consist of millions of micro pores. Many odor-emitting toxic gases are captured thanks to these pores. Active carbon filters must be changed depending on the ambient air pollution and frequency of their use. Active granular carbon filters are used as odor eliminator filters in the places where heavy odors emanate. In active granular carbon filters, only granular carbons are replaced when the filter becomes dirty. There is no need to replace the filter cells.
Particulate Arresting Filters
HEPA that is also known as particulate arresting filter stands for High Efficiency Particulate Arresting. HEPA filters are the filters that can separate 85% of the particles with the sizes up to 0.3 micron from the air. Filters, which are more precise than HEPA filters with their precision percentage of % 99,999, are called ULPA filters. HEPA and ULPA filters have a paper-like maintenance-free structure consisting of special fibers. These filters must be replaced with new ones in a certain period of time. Because of their filtration performances, reliabilities and maintenance-free structures, today HEPA and ULPA filters are used in operating theaters, hospitals and clean room applications. MDF, plastic, or metal-framed HEPA and ULPA filter models are available.
U.V Disinfection Filter Cell
The rays, which are shorter than the visible rays but longer than X-rays, are called ultraviolet rays. It is because human eye can see the range between red and violet lights.
In the ultraviolet filter systems used in Alp central-station air handling units are equipped with ultraviolet lamps providing UV rays. Quartz tubes allow for the best UV rays passage is used in order to prevent ultraviolet lamp from contacting the water. UV lamp has a life of 9000 hours. After the completion of this period that is about one year, you can reactivate the system by just replacing the lamp.
This special light utilized as a disinfectant is also called short-wavelength light or UV-C light. This light length is between the UV-C band of 200 nm (nanometers) and 280 nm.
The wavelength required for disinfection is 253.4 nm (0.0002534 mm). These lamps are used as sterilizers, with the applications made in different ways depending on the environments, where they are intended to be utilized.
UV rays with a wavelength of 253.4 nanometers immediately neutralize microorganisms, bacteria, viruses, molds and fungus spores at the rate of 99.99%, by disrupting their DNA structures. They prevent replication between thymine molecules in the DNA structure.
The filter types used in Alp central-station air handling units are determined depending on the filter types used, structure of the central-station, manufacturing criteria and requirements.
Heating and Cooling Coils
In Alp central-station air handling units, coils with copper pipe and aluminum fin or steel pipe and steel fin are used, depending on the requirement. Heating and cooling coils are subjected to 20 bar leakage test after their production. The frames of the coils are made of stainless Cr-Ni or galvanized metal sheet. The coils can be easily intervened by removal of the side cover.
Cooling coils of our central-station air handling units are equipped with condensation tray and drift eliminator.
Drainage trays used in all our central-station air handling units are produced of stainless Cr-Ni.
As a standard when the steam pressure is under 4 bar, steam heating coils are produced as with thick-wall copper pipes and aluminum fins. And systems with a pressure under 4 bar are produced as dip galvanized and with steel spiral. They are also made of stainless metal sheet for special applications.
In central-station units, which will be used in the places with no risk, the heating and cooling coils are placed in a single cell. However, a plenum cell with a width of 600 mm must be placed in areas with the risk of freezing. That plenum cell will also facilitate the assembly of the plenum cell freezing thermostat.
Drift Eliminator
Cooling coils of our central-station air handling units are equipped with condensation tray and drift eliminator.
In cooling exchanger, drift eliminators with PVC or aluminum fins are used, depending on the air flow speed. Drift eliminator fins are designed in such a way as to keep the maximum amount of water, and can be taken out with skid. Condensation trays are made of 1.5 mm thick stainless steel plates, with a size that can contain the heat exchanger and drift eliminator.
Humidifiers
Mat Type Humidifiers
In mat-type humidifiers used in Alp central-station air handling units, the process is carried out by evaporation. Since droplet is not carried, situations dangerous for the health are not created. The lengths of mat-type humidifiers are between 600 and 900 mm. Depending on your desire, plenums with the length of 600 mm can be placed at the outlet sides of the humidifiers for ease of maintenance and service.
Steam Type Humidifiers
Steam humidifiers used in Alp central-station air handling units are classified in two types, as the ones producing the steam by themselves and the ones using the existing steam. If there is a sufficient amount of steam in the place to be acclimatized is available, the condensed water in the steam is separated and sprayed in the form of dry steam to the acclimatized air, and thus, the humidification process is carried out. With a 2-way motorized valve mounted on the steam injection nozzle, the desired humidity level is controlled proportionally or in two positions. The lengths of steam humidifiers vary between 600 mm and 1200 mm, depending on the desired efficiency and weather conditions.
And in the places where steam is not available, humidifiers that can produce their own steam by evaporating the water through the electrodes can be used.
Silencers
Silencers used in Alp central-station air handling units are placed after the fan and before the bag filter. And aspirator silencers are placed immediately before the aspirator. Aspirator silencers can be directly connected to the aspirator cabinet. However, in applications with radial fan, a plenum cell with the length of 600 m equipped with deflector must be placed between the fan and silencer, for an appropriate air distribution. In the cases where plug fans are used, there is no need for additional plenum. Deflector be placed into the fan cabinet. Interior surfaces of the silencer are produced of stainless metal sheet, in such a way as to ensure homogeneity with the other parts of the cabinet. Silencers are produced as with a 900mm, 1200mm, 1500mm, 1700mm and 2000mm.
Heat Recovery
Double-Coil Type Heat Recovery
Double-coil heat recovery systems used in Alp central-station air handling units are made by placing one of the two heat exchangers with finned pipe into the exhaust unit, and placing the other on the inlet of the fresh air unit. By means of a heat pump, the heat-conveying fluid is circulated through the coils. With the heat gained by heating the fluid passing through the exhaust unit is used to heat the fresh air by the heat exchanger. In the places where the outside air temperature is higher than 0 °C, water can be used as the heat-conveying liquid. However, when the places where the outside air temperature is lower than 0 °C, ethylene-glycol mixtures in certain proportions up to 40% are used to eliminate the risk of freezing. In the cases where the temperature at the fresh air outlet of the heat recovery coil is lower than 0 °C, the heat-conveying liquid is used with an automatic defrost system, in order to prevent freezing on the surfaces of the heat-conveying coil in contact with the air. If there is a risk of surface condensation in the heat recovery coil at the exhaust side, condensing vessel is used. In addition, drift eliminator is used for the air velocities higher than 2.5 m/sec.
Plate-Type Heat Recovery
With their efficiencies up to 70%, plate-type heat recovery systems used in Alp central-station air handling units provide more heat recovery in comparison with the double-coil systems. However, single or two-storey central-station air handling units are used instead of classical central-station units, in order to implement plate heat recovery systems to air handling units. Plated heat exchangers with butt and by-pass dampers are used in heat recovery systems when the outside air temperature is lower than 0 °C, due to the risk of clogging caused by frost on the surfaces at the exhaust air side. In such a case, a two-position servo-motor is used to drive the dampers. When a pressure loss increase signal is given by the differential pressure switches due to clogging, the butt damper is closed and by-pass damper is opened to melt the ice. When the pressure loss returns to normal, the dampers are turned to their previous positions by means of the servomotor.
Rotary Drum Type Heat Recovery
Rotary drum type heat recovery devices used in Alp central-station air handling units are produced of rotary type heat recovery rotor that rotates in the cell. The rotor is rotated by a motor and belt-pulley mechanism. Its specially designed carcass cell is made of aluminum that is protected against sea water. It is also manufactured from galvanized steel. The rotor is made of alternating flat and corrugated aluminum fins.
The heat recovery devices used in Alp central-station air handling units are determined depending on the structure of the central-station unit, manufacturing criteria and requirements.
Dampers
Air dampers used in Alp central-station air handling units are produced of specially extruded aluminum profile cases and fins having an aerodynamic structure. Structure of damper fin and cassette are made of aluminum. Air leaks are minimized by using gaskets at the fin edges. Damper fins are connected to fiber glass reinforced plastic gears. Dampers work sensitively and without space. They are controlled manually or by servomotor.
Damper gears used in Alp central-station air handling units have been designed in such a way as not to contact the air and hidden with special aluminum profiles, for protection against the external factors such as dust, contamination etc.
Electric Motors
Three-phase asynchronous squirrel cage electric motors with the protection class 1P55 are used in Alp central-station air handling units. Generally the motors used are single-speed motors but two-speed motors can be used as well, upon special demands. Electric motors are placed on special motor bases with tension mechanism.
Electric Heaters
Electric heaters used in Alp central-station air handling units are used for support purpose or for low heating loads. Electric heaters are preferred particularly in the places where it is difficult to heat the air by known methods or where the filters and serpentines are required to be protected against freezing.
Electric heater elements used in Alp central-station air handling units are made of stainless steel sheet, and their frame is made of galvanized steel sheets. As a standard, electric heaters are equipped with automatic-reset limit thermostat and manual-reset safety thermostat. Their protection class is IP43. Electric heater is energized only when the fan runs. The required measures have been taken to cut energy when the fan does not run. In our electric heaters with a capacity higher than 30 kW, the fan runs for 2-3 minutes after any power failure, and reduces the heat remained on the electric heater, in order to eliminate the risk of any possible fire.
Selection Program for Alp Central-Station Air Handling Units
As the software intended for the selection of Alp central-station air handling units, ALPAIRCOMFORT allows for selecting the central-station air handling units and designing their all kinds of applications in a Windows-based process. With the software ALPAIRCOMFORT intended for the selection of central-station air handling units, it is extremely easy and fast to select the central-station air handling that has the desired features.
Manufacturing Process of Alp Central-Station Air Handling Units
After selected by the software ALPAIRCOMFORT, Alp central-station air handling units are designed in the projects in line with the customer's demands, principles of the specifications, technical data and standards, with the collaboration of the R & D and production departments, for starting the production. Alp central-station air handling units are completely produced on computer-aided precision and speed CNC benches. During the production and assembly stages, Alp central-station air handling units are controlled and tested in accordance with the quality plan of the related product. In this way, performances of the central-station air handling units can be continuously monitored, and their conformity with the related standards is ensured. Central-station air handling units, productions of which have been completed in the factory, and which have been subjected to the required inspections and tests are transferred to the assembly area, by taking all the safe transport criteria as a basis. For your all kinds of technical inquiries related to our central-station air handling units, you all need to contact our technical service department.