Mini Chiller Performance

A mini chiller (also called an apartment chiller) is a small, low-noise air-cooled chiller with a capacity of less than 20 RT (Refrigeration Ton). It is used in apartments, villas, and buildings that want independent cooling and heating systems.
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mini chiller important tips

A mini chiller (also called an apartment chiller) is a small, low-noise air-cooled chiller with a capacity of less than 20 RT (Refrigeration Ton). It is used in apartments, villas, and buildings that want to have independent cooling and even heating systems and to get rid of the problems of the central powerhouse.

Mini chillers, where the refrigeration cycle, based on the capacity, has one or more scroll compressors and one or more circuits, are usually installed on the building's terrace or roof. These systems convey water to the building after cooling it in the evaporator. After circulating in the fan coil, the cooled water provides the cooling conditions required for each interior space of the building.

Advantages

• Two seasons heating & cooling system
• Exclusive cost for each air conditioning unit
• No sound with the wind movement because of removing the channel from the system
• Low wear and tear, vibration, and noise as well as high lifespan because of the small number of moving parts
• Possibility to use in open spaces such as roof and terrace
• High reliability, ability to provide low tonnage, and low power consumption
• Easy repair and maintenance, and very low maintenance costs
• Applicable in arid and tropical regions
• No need for the cooling tower
• No-frost system, because of using a stainless steel plate evaporator
• Separation of the room temperature and sound from each other

Comparing a mini chiller with a ducted split system

• Because of frequent questions from residential unit builders regarding the comparison of the cost of preparing, implementing, and exploiting the ducted split system with a mini chiller (plus fan coil) for each residential unit, and according to calculation, estimation, and experience of sales experts in the DamaTajhiz Company, estimating and correct comparison of these costs depends on numerous factors, including the selected brand, the unit's meterage, location implementing procedure, and so on. But in normal circumstances, the cost of purchasing a mini chiller, installing, and implementing it (plus a roof fan coil) is estimated to be about 40% higher than the ducted split system for the same residential units and brands.
• There is little difference between a mini chiller and a duct splint, in terms of operating costs which mainly include electricity, periodic maintenance, and refrigerated gas charging.

Performance & Components

Mini chillers are usually air-cooled systems with smaller dimensions and capacities. Their function is as follows:

The refrigerant gas is condensed by an air-cooled chiller's compressor. The condensed gas then enters the condenser with high pressure and temperature, cools with water or air, and turns into a liquid form. This refrigerant fluid loses its temperature by bypassing the expansion valve or the capillary tube, which breaks the fluid pressure, to absorb the water heater inside the evaporator after entering the evaporator coil. Because of the evaporator's less pressure than the condenser, the refrigerant fluid evaporates. The heat required for evaporation is supplied by the water circulating in the air conditioning system inside the evaporator. As a result, the water of the refrigeration system is cooled inside the evaporator and then transported by a circulating pump system to a coil of cool water in fan coils and an air handling unit to create cool air at the desired location. After this process, the evaporation gas returns to the compressor by the suction power, and the cycle continues.

Water in the cooling circuit of the building is cooled by the evaporator or heat exchanger of the mini chillers, which are available in both tube and plate shield types. The evaporator contains both refrigerant gas and refrigeration circuit water pipes. During the evaporation of the liquid in the refrigerator and receiving the heat by gas, the system's water will be cooled. When using a plate heat exchanger, and applying a large number of thin metal plates, the high heat exchange then will be carried out between the hot and cold fluids. The hot and cold fluids are entered from two opposite directions into the converter. Then the fluids flow alternatively between the metal plates, and so the heat exchangers occur.

Compressors are scroll-type compression mini-chillers. Mini chillers are used in low capacities for a residential unit and their drive is powered by one and/or three-phase urban power.

The Air condenser in mini chillers consists of some copper coils with mostly aluminum fans. Cooling operation is carried out by big axial fans.
Some mini-chillers that also have a heat pump can provide the hot water needed by the fan coil in the winter.

In general, besides calculating parameters such as geographical conditions (ambient temperature) and outside summer temperature, altitude above sea level, air relative humidity, type of building usage (indoor design temperature), type of materials used, and implementing the building elevation, the angle of the building position to the sun's radiation, number of floors and building foundation area, number of rooms, small and large indoor electrical equipment, etc., the facility experts consider the amount of cold water required and the confidence coefficients in the chiller function as well to calculate the chiller capacity required for each project, which is based on the exact calculation of total cumulative load capacity. But to calculate the total (Phase 1) chiller required for residential and administrative buildings in some climatic conditions (including Tehran), consider the nominal capacity of approximately 6 RT per 100 square meters.
The use of mini chillers with fan coil, besides many benefits, allows using two cooling and heating systems in the fall season for the different desires of the building residents.
By installing a mini chiller in old buildings where the central chiller is out of operation and/or not having high efficiency, there is no need to install and use other expensive air conditioning equipment because the fan coil and pipe network are already in the building, and you only need to install a mini chiller to produce optimal cooling.

 Technical information on designing compression mini-chiller circuit

• Free cooling in air-cooled chillers
• Superheat refrigerator in condensed chiller suction line
• Sub-cool in condensed chiller condenser
• Down pump for condensed chiller

You can also read the article SAND FILTER AND ITS TYPES for more information.

Final speech

The specialized collection (Damatajhiz) (the first and most reliable authority in the country in the field of building facilities equipment and all air conditioning devices), offers you all kinds of sand filters and hundreds of other products, guaranteeing the originality of the product, valid warranty, and reasonable price. In addition, if you have any questions about choosing and comparing the brands of this product, you can get free advice from the heating equipment experts.

In Iran, the first and most famous specialized group in the field of building installation equipment, air conditioners, and all equipment for swimming pools, saunas, and jacuzzis since 2004, DamaTajhiz is a specialized group. Refer to the time of this group. For more information, you can get advice from the experts of DamaTajhiz Engineering and Production Company by calling 021-88822550.

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