Air conditioner with forced ventilation - how to choose for an apartment?

Varieties of air conditioners with forced ventilation

It has not yet been possible to combine the two functions of air preparation in a full-fledged mode. The very best systems can only use the air supply from the street for 30% of the total capacity. At the same time, the air conditioner becomes much more complicated and the price rises.

For houses and apartments, only single-block air conditioners, of various modifications, split systems can be used. They serve to ensure the regime on an area not exceeding 100 m2. We will not consider cassette and column air conditioners.

Duct air conditioner with fresh air supply

The device of the channel system is two-module. One compressor-condensing unit is located outside the perimeter, the evaporative unit is located inside the premises. They are connected to each other by copper tubes with freon and electrical wiring. The evaporating unit can be hidden in the cladding of the room. Air conditioners with the function of inflow of fresh air from the street produce air exchange into the room for 2-3 hours. Physiologically, the air becomes healthy, oxygenated. These air conditioners include systems from Daikin “Ururu Sarara”. Hitachi and Haier created their models with fresh air.

The technology for purifying and mixing air streams is complex. In a special block outside the perimeter, the air taken from the street passes through a manganese catalyst, adsorption of impurities, including odors, occurs. There is a filter at the entrance to the air conditioning system, which retains small debris, insects and other external dirt. After that, the gas streams are mixed and passed through a photocatalytic filter, where they are biologically disinfected. Clean air is enriched with vitamins and hyaluronic acid. The healing product is delivered to the premises.

Duct air conditioner with fresh air admixture

The apartments use multi-split systems. They represent an installation with one unit placed outdoors, there can be 2-4 indoor modules. The system is equipped with an additional device for preparing air from the street. In such air conditioners, the intake of fresh air does not exceed 10% of the total volume in the circulation system. A specialist can install and correctly calculate a multisystem. At all exit points, the air parameters will be the same. This is the main disadvantage of a multipoint split system. More than 4 sampling points are not provided, because it is difficult to balance such a system in terms of performance.

A split system with a wall-mounted indoor unit operates using a mixture of air from the street. But at the same time, the external unit of the air conditioner is modified, a fan and a mixing chamber are used. An air preparation unit is installed next to the perimeter, providing winter heating and a coarse mesh for debris and living creatures.

Supply and exhaust ventilation and duct air conditioning of the apartment

A fairly simple but effective system. No frills. But much better than the absence of such a thing in principle.
At the time of photographing, the ventilation unit had not yet arrived (ordered item). So on the balcony you only see the intended place for its installation. When choosing an air conditioning system to simplify and reduce the cost of the facility, we opted for one channel air conditioner (which provides hidden installation) and two classic wall-mounted inverter air conditioners. At the same time, as an external unit - a multi-split system for 3 air conditioners: we save space for the sign of external units.

Before entering the facility, a ventilation and air conditioning project has been created.Below are four sheets (a much larger volume, of course, falls on the calculated and effective part of it):

Master plan of ventilation and duct air conditioning systems

Section of the project dedicated to the implementation of the channel system

Plan for creating fresh air ventilation in a city apartment

Axonometric diagram of each individual system

After agreement, approval by the customer, drawing up the final commercial proposal (with the selection of specific equipment for the project) - the conclusion of the contract and access to the first stage of implementation.

Air conditioner that takes air from the street

The channel split system uses the supply circuits most competently. Does this air conditioner take air from the street? One remote unit is located outside the circuit, the evaporators are connected to it by piping, installed in a suspended ceiling or false wall. An outdoor air preparation unit is used, which is supplied to the system in several places. The condition is that there is enough space behind a wall or under a ceiling to accommodate the equipment. The system is programmable, regulation is carried out by an electronic unit. The unit for preparing the air flow from the street and the duct air conditioner have different control panels. The addition of fresh air can be 30%. As a result of the renewal, the balance of carbon dioxide and oxygen content changes.

Finishing

When my wife looked at all these pipes, she “affectionately” called them a workshop. But after the final finishing they managed to hide most of them. The duct air conditioner and most of the pipes are hidden under the false ceiling in a small corridor.

Air conditioners with fresh air supply for an apartment

Another type of split systems is the supply and exhaust air conditioner in the product line from Hitachi, they are not very powerful, the air exchange reaches only 8 m 3 per hour, but this amount is enough for a bedroom. The Hitachi RAS-10JH2 air conditioner is an example of a supply-and-exhaust split system. The model has an inverter compressor, 2 pipes are used - supply and exhaust. The air is removed forcibly, fresh air from the street can be heated. The control panel has separate options for supplying air from the street and removing waste. One mode is selected, then the system is adjusted to an equilibrium state.

Haier offers 2 models of premium air conditioners: Aqua Super Match AS09QS2ERA and LIGHTERA HSU-09HNF03 / R2 (DB). In these units, the supply air system is an additional option. But having bought the equipment, it is possible to provide air renewal with a flow rate of 25 m 3 / hour. Both models of air conditioners have a built-in function for mixing air from the street. For this, the external block has a forced-air fan and a mixing chamber for two gas streams. The flexible outdoor air hose can be introduced directly into the room in one way or another.

Device and principle of operation

The intake air conditioner can be produced in several varieties.

Among consumers, there is a demand for devices with a forced air flow system, the location of the unit of which is duct or wall. The difference between the device of such systems from standard ones is:

air duct - it connects the indoor unit to the outside;
purification of supplied air mixtures.

Ducted air conditioners for ventilation are equipped with heaters, which are designed to heat the flow of air masses regardless of the season. They can be water-based or electric. Supply air conditioner equipment:

Indoor (evaporative) block

It consists of a heat exchanger, fan, filter, electronic control unit.

If the air conditioner is wall-mounted, the indoor unit is mounted on the wall.

If the ventilation unit is ducted, the indoor unit is mounted in a duct or above a suspended ceiling.Thus, installation does not violate the design of the room, because all equipment is hidden behind the ceiling, while air is supplied through decorative grilles.

Outdoor unit

It consists of a compressor, a condensing heat exchanger, a fan for air cooling, a suction turbine, a chamber for mixing air masses.

The outdoor unit is mounted externally. If such a unit is equipped with a centrifugal fan, it can be installed indoors.

Principle of operation:

Fresh air flows are supplied to the air conditioner through the outdoor unit using a suction turbine.
Fresh air enters the mixing chamber of the indoor unit through the air ducts.
With the help of the chamber, the process of mixing incoming fresh air flows and outflows of air masses of the room is carried out.
Then the already mixed air is purified.
Before the air flows into the room, they are additionally processed (heating, cooling, humidification, etc.) according to the parameters set by the user, which can be automatically maintained.

Rules for placing block air conditioners with air supply from the street

When installing the evaporators on the ceiling, it is important that the cool air flow does not reach the area where people are located. Therefore, narrow slotted blinds are used. The higher the ceiling, the better the counter gas flows are averaged. In a split duct system, the distance between the normal and false ceilings is not less than 25 cm. The same applies to the false walls behind which the channels pass.

In any case, ducted air conditioners or split systems with fresh air inflow will cost more at a price, and it is more difficult to operate than a separate supply and exhaust system and air conditioner. Devices 2 in 1, naturally, have somewhat truncated capabilities.

Fresh air conditioner

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