DamaTajhiz ZNT (ZENT)

DamaTajhiz ZNT units are manufactured in various types, including domestic and commercial, and benefit from high-quality components with fast delivery.

DamaTajhiz ZNTs have been produced as one of the best-selling products and have been sold in the Middle East and West Asia since 2004. The following content provides the technical specifications, buying guide, and sales terms along with the best prices for all models of DamaTajhiz ZENTs.

DamaTajhiz ZNT Experts' Buying Guide and Price List

ZNT or ZENT is a type of dual-purpose cooling and heating device suitable for the climate conditions of cities with non-humid weather in summer. In addition to providing heating and cooling, it also regulates the humidity level of the air.

ZNT is an abbreviation of "Zemestaneh-Nimeh-Tabestaneh" (Persian: زمستانه نیمه تابستانه) which translates as "semi-winter, semi-summer" and has a completely Iranian design.

ZENTs are suitable for use in places such as residential homes and villas, schools and educational centers, offices, greenhouses, industrial workshops, stores, cinemas, and theaters, furniture production workshops, and wooden products, among others.

Generally, the components of the ZENT device include the main body of the device, an electric motor, a fan, a water pump, cellulose pads, an air damper, a return air vent, a fresh air intake vent, a cold and hot air outlet vent, and a heating coil (if needed).

You can browse, compare, and select various types of domestic and commercial ZNTs from DamaTajhiz with fast delivery.

The cooling function of ZENT devices is similar to that of evaporative coolers, with the difference that they have larger dimensions than evaporative coolers. In addition to having cellulose pads and a water pump for cooling the air in summer, they also use a hot water coil to create warm air in winter.

The operation of ZNT in summer works as follows: first, they draw in outside air and pass it through wet cellulose pads. Then, the cooled air, after passing through the cellulose pads, is transferred to the interior spaces of the building through installed ducts.

On the other hand, in winter, the ZENT fan draws in the indoor air and passes it through the hot water coil at the device's outlet, distributing warm air through the same ducts in the building's spaces.

In general, ZENTs are divided into two types: domestic and commercial. The selection of this device is based on the airflow volume (CFM-m3/hr) for evaporative cooling performance in summer and the heating coil (kcal/hr) for providing heating in winter.

Benefits of Using a DamaTajhiz ZNT

DamaTajhiz ZNTs have so many benefits including:

• Low installation and maintenance costs
• Very low electricity consumption due to the absence of a compressor
• Gentle airflow and proper circulation of air inside the building
• Elimination of radiator systems and plumbing in the building or warehouse
• Cheaper price compared to other air conditioning systems
• Simultaneous capability for heating and evaporative cooling
• Reduced heating time for indoor spaces in winter compared to radiators in heating mode
  
  

Key Factors to Keep in Mind Before Buying a DamaTajhiz ZNT

Before choosing and purchasing the desired domestic or commercial ZNT device, attention should be paid to the following points, and you can consult with our experts and specialists in this field at the DamaTajhiz HVAC store.

• Installation location, conditions, and how to install the ZNT in the building
• Capacity and airflow volume of the device (based on cfm or m³/hr)
• The airflow direction of the device (front or side)
• Determining the type of ZENT needed (ceiling, rooftop, or standing)
• Attention to motor power, airflow volume, and static pressure required for the device
• Possibility of placing the ZNT device in an indoor environment with the ability to provide completely fresh air in summer
• Accurate calculations and proper implementation of air distribution ducts
• Calculating the capacity and thermal surface area of the heating coil
• Presence or absence of a heating coil
• Number of rows, diameter, number of fins (FPI), material, and thermal surface area of the heating coil
• Determining the type and pressure drop of the heat transfer fluid (hot water or steam) in the heating coil
  
  

DamaTajhiz ZNT Technical Aspects and Performance

The operation of the ZNT device is such that, with the entry of fresh air, which must have a relative humidity of less than 40 percent in the summer, cooling operations in summer or heating (in winter) take place in the main chamber of the ZNT.

Cooling Operation

The ZNT device is a dual-purpose cooling and heating system, and its cooling system operates similarly to industrial evaporative coolers using the evaporative cooling method.

In this way, city water enters the ZNT device's pad through the piping system, and then, using a pump, the water collected from the ZNT pad is drawn and reaches the nozzle collector.

At this point, the water is evenly distributed and flows over the cellulose pads installed inside the ZNT device through the nozzles. On the other hand, fresh air, which is drawn in by the motor and fan from around the device, passes over the wet cellulose pads and, after cooling, enters the air distribution ducts.

It is emphasized again that the use of any type of ZNT device for cooling air in the summer is only in areas with non-humid air (relative humidity less than 40 percent).

If 100 percent fresh air is used and the required airflow volume for the device is calculated correctly, along with the proper design and execution of air distribution ducts and, of course, the selection of the motor with appropriate power and fan with precise static pressure, it will be effective.

The passage of air through the layers of cellulose pads that have been moistened by water and nozzles results in heat loss and cooling of the air exiting the device through the evaporative cooling process.

Heating Operation

In winter, in residential and office applications, the fresh air inlet vent or window is usually closed, and the return air mainly enters the device through the return duct. On the other hand, hot water enters the ZNT heating coil through the central boiler or heating package via the piping system.

As air passes between the fins of the heating coil installed at the beginning of the distribution duct, the warm air enters the air distribution duct.

Then, after losing its heat in the coil, the hot water is returned through the return pipe to the boiler or heating package. This cycle is continuously maintained during the cold seasons so that hot water is continuously flowing in the ZNT heating coil.

It should be noted that in specific applications where the fresh air inlet duct is somewhat open, especially in educational, medical, and religious centers, fresh air can also be used in winter. In such cases, considering the low temperature of the air in winter, energy consumption and related costs naturally increase.

Filtration System

ZNT devices from Damatajhiz are equipped with an aluminum air filtration system upon customer request.

The structure of these types of filters consists of several layers of aluminum mesh with very fine openings arranged in a honeycomb and sinusoidal pattern so that as air passes over this filter, dust and suspended particles in the air are captured, resulting in clean and pure air.

It should be noted that depending on the type of order and project needs, aluminum filters can have four or five layers, and in addition, for better air filtration and based on the type of order and project needs, special bag filters can also be used in the outgoing air path.

Dehumidification

Dehumidification in ZNT is possible when the temperature of the sprayed water in the device is lower than the wet bulb temperature of the incoming air. The colder the sprayed water, the more effective the dehumidification from the air.

Corrosion Control 

Corrosion control in any metal system that works with water is necessary. Carbon dioxide, sulfur dioxide, and other corrosive gases can cause serious problems in the device due to dissolving in water.

The combination of these materials forms a mild dilute acid that easily penetrates unprotected surfaces and causes rust and corrosion in the device, characterized by a drop in pressure at the water spray nozzle.

To remedy this situation, a protective and corrosion-inhibiting coating is applied to the metal surfaces, which raises the pH of the water to about 9. This pH level prevents the formation of dilute acids in the water and the growth of bacteria inside the ZNT device.

Odor Control

Given the operation of ZNT devices, which produce cool and pleasant air for our comfort, the air must be clean and free of any odors and pollutants. On the other hand, due to the operation of ZNT devices, the internal surfaces of the devices and the ZNT pad usually become slimy over time and gradually develop an unpleasant odor.

To address this issue, mild oxidizers, such as hydrogen peroxide and bromine, are used (these substances are added to the ZNT basin periodically).

Conclusion

Evaporative systems like the ZNT device are suitable for hot and dry areas with relative humidity of less than 40 percent in summer.

These systems are particularly cost-effective for large buildings with high ceilings, such as sports halls, mosques, mushroom cultivation halls, greenhouses, passenger terminals, educational centers, cinema and theater halls, chain stores, medical and treatment centers, etc., compared to compression refrigeration systems (air conditioners and chillers).

It should be noted that the electricity consumption cost of these devices is less than one-fourth that of air conditioners and compression chillers.

Buying a DamaTajhiz ZNT

In the first step to purchasing a DamaTajhiz ZNT, you need to pay attention to the required cooling or heating capacity as well as the dimensions of the installation location.

This is because DamaTajhiz ZENTs are produced in various types (ceiling-mounted, rooftop, and commercial) and have different cooling, heating, and airflow capacities.

Before proceeding to buy these devices, you should first consider the area and usage of your intended environment so that you can make a correct and appropriate choice in the model and airflow capacity of the DamaTajhiz ZNT at a suitable price.

Then, factors such as energy consumption, features, advantages of the relevant ZENT, and the warranty and after-sales service provided by the company are examined.

Here at the DamaTajhiz HVAC store, technical specifications of various ZENTs with the DamaTajhiz golden warranty are provided for you to enjoy an optimal and smart shopping experience.

The Price of DamaTajhiz ZNTs

In general, the price of DamaTajhiz ZNTs is determined based on their type (ceiling-mounted, rooftop, and industrial) as well as their capacity.

It is worth mentioning that all ZENT devices offered at the DamaTajhiz HVAC store are reasonably priced, and the discounts desired by customers have been included in these prices for everyone to enjoy.

DamaTajhiz ZNT Top Buyers

While thanking all our dear customers, here's the list of the top 11 buyers of the DamaTajhiz ZNT:

1. Mr. Yazdani - Karaj: 24 DamaTajhiz 3,500 CFM and 4,000 CFM ZNT(s)
2. Mr. Nazempour - Vardavard Street: 6 DamaTajhiz 4,000 CFM Under-Ceiling and Rooftop ZNT(s)
3. Mr. Khader - Tehran: 1 DamaTajhiz 3,000 CFM Under-Ceiling ZNT(s) - Model: DTA-ZE300
4. Mr. Sadeghi: 1 DamaTajhiz 7,000 CFM ZNT(s) - Model: DTA-ZE700
5. Mr. Hamidi: 1 DamaTajhiz 7,000 CFM ZNT(s) - Model: DTA-ZE700
6. Mr. Norouzi - Zanjan: 1 DamaTajhiz 3,000 CFM ZNT(s) - Model: DTA-ZE300
7. Mr. Zamanian - Tehran: 1 DamaTajhiz 3,000 CFM ZNT(s) - Model: DTA-ZE300
8. Mr. Akhaei - Tehran: 1 DamaTajhiz 6,000 CFM ZNT(s) - Model: DTA-ZE600
9. Mr. Mohammad (Ghasem Nikbarat Project) - Tehran: 1 DamaTajhiz 1,000 CFM ZNT(s) - Model: DTA-ZE100
10. Allameh Sherani Educational Complex Project - Tehran: 1 DamaTajhiz 1,000 CFM ZNT(s) - Model: DTA-ZE100
11. Bukan Nursing Home Project - Tehran: 8 DamaTajhiz 2,500, 3,000, 4,000, and 4,500 CFM Rooftop ZNT(s)
    
    

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