What is a hot and cold apartment mini chiller

Apartment mini chiller is the same as a home chiller, or in other words, a smaller model of an air-cooled chiller with a limited capacity (often less than 10 tons of refrigeration). These devices are installed in the outside of the building such as the yard, roof or terrace. The task of the apartment mini chiller is to cool and heat the air of small spaces such as apartments, offices and environments with low area (100 to 500 meters per mini chiller).

Apartment mini chillers are placed in the category of compression chillers, due to the importance of easy installation and operation of HVAC systems, their condensers are designed and produced in air-cooled form. Also, scroll and sometimes rotary compressors are often used in apartment mini chillers to condense the refrigerant.

How to cool and heat an apartment mini chiller

The cooling and heating of these devices is done by cooling water (in summer) and heating water (in winter) through electric energy, and then pumping it to the pipes of hot and cold air distribution devices such as fan coils and air conditioners. Takes. Due to the lower cost of gas consumption compared to electricity, city gas is sometimes used for heating in winter instead of electricity (rooftop package). For this purpose, either an engine room (boiler) is used for heating all apartment units, or a heating package is used for each unit separately. The package or boiler heats the water and sends it to the pipes of the fan coils inside the building to heat the air inside the building by the fan coils in winter.
Mini chillers do not need air distribution ducting and are usually connected to a number of fan coils with water piping. The cooled water is transferred by the pump to the coils inside the fan coils and when the air is blown from the coils by the fan in the summer season, the cold air enters the indoor environment of the building. Of course, it should be mentioned that the air passes through the fan coil filter before entering and is purified to some extent.
To estimate the chiller or mini-chiller capacity of each building in weather conditions like Tehran, usually about 4 tons of cooling capacity is considered for every 100 square meters of useful infrastructure. For example, for a 200-meter unit in the climate of Tehran, about 8 tons (refrigeration) and for a building with a useful infrastructure of 2000 square meters, a central chiller of 80 tons (refrigeration) is considered.

Apartment mini chiller performance

Apartment mini chillers, like all compression chillers, work based on the compression refrigeration process (Carnot cycle) in which the refrigerant vapor is condensed by the compressor, and its pressure and temperature increase. Then the heat of the refrigerant is transferred to the outside air through the condenser and turns into a liquid. The liquid coming out of the condenser undergoes a large pressure drop when passing through the expansion valve, so that a part of the refrigerant liquid evaporates and leads to a further decrease in the temperature of the refrigerant. In this way, the cold refrigerant entering the evaporator cools the passing water streams and returns to the compressor after evaporation.

Advantages and disadvantages of apartment mini chillers compared to central chillers

One of the challenges of users and employers is deciding between a chiller and a mini chiller. Whether to use a chiller as central ventilation, or to use several mini chillers separately.
The following are the advantages of using apartment mini chillers:

Smaller volume and weight of apartment mini chillers and the possibility of using them in different spaces compared to central chillers
Independent control of the electricity consumption of the apartment mini chiller compared to the building's central chiller
Independent access to the mini chiller for repair when the device breaks down
Mini chillers do not need a cooling tower, tower pump and extensive air conditioning equipment piping in the building
Among the disadvantages of using apartment mini-chillers, we can mention the higher price of the total of mini-chillers used in a building compared to a central chiller. Therefore, in general, if the building in question does not have a problem in terms of paying for electricity and repairs, and there is a possibility of sufficient benefit from a central chiller, it is better not to use multiple mini chillers.
Also, when comparing the electricity consumption of chillers and mini chillers, the total number of mini chillers used should be considered. But in general, the power consumption of a set of mini chillers in a building is higher than a central chiller in the same building. And the final point is that if you choose a mini chiller, you should pay attention to whether the electricity required for that capacity is single phase or 3 phase, and if it is 3 phase, does the relevant unit have 3 phase electricity?

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final word

In this article, the hot and cold apartment mini chiller was reviewed to some extent. We hope that we have provided useful information in this regard. You can visit the website of Dematheheez specialized collection (the first and most reliable specialized collection in the field of building installation equipment and all air conditioning devices) to view and compare the types of apartment mini chillers with different brands and capacities, as well as to know the updated price of the products. 1383 and having 3 valid business licenses) refer. To get more information and get advice, you can contact Dematheziz experts during office hours.

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