Jablotron VAV ventilation system and air conditioning in an art gallery, Kiev, st. Prorizna

We invite you to familiarize yourself in detail with the air conditioning and ventilation systems implemented at the commercial facility, which includes an art gallery, a showroom and a VIP area. The object is located in the very center of the capital - on the street. slotted.
CONDITIONING
An air conditioning system has already been implemented at the facility - the Daikin Super Multi Plus multi-zone mini VRV system. It includes:
outdoor unit RMXS160-EV
2 VR-blocks VRMK928V42 and VRMK928V43
3 internal low-pressure duct type units: FDXS25, FDXS35 and FDXS50
2 wall-mounted FTXS20 air conditioners for cooling the technical room and the VIP area of ​​20 m2.
We have previously tested and sent for service all the equipment remaining at the facility. At the moment, all air conditioners are checked, cleaned and ready for active use.
We also designed and installed a channel split system based on a 12 kW Panasonic air conditioner. The indoor unit (S-F50DD2E5) was placed in the entrance group, in the reception area. It provides pressure up to 100 Pa and serves the gallery. This decision is due to its design features: high ceilings and large windows that let in a lot of heat. And given the number of visitors in the future, air cooling here should be of the highest quality.
The outdoor unit (CU-B50DBE8) is located on the outside of the building and is ready for use.
At the entrance to the shop, there is a Daikin FDXS duct low-pressure air conditioner with a capacity of 5 kW. Cooled air is supplied and distributed through Trox AHP concealed ventilation grilles. Thanks to this placement of the air conditioner, we managed to maintain the height of the ceilings, which were initially quite low in this area.
The dressing room also has a Daikin ducted air conditioner. Air is supplied through a ventilation grill installed at the entrance to the room. Heated air from the fitting room is taken through 2 plenum boxes. This is how recycling works.
The third duct air conditioner is located in a small staff room.
VENTILATION
We designed and installed a supply and exhaust ventilation system with variable air flow. It is implemented on the basis of Czech equipment:
2 air handling units Jablotron Futura L
Jablotron VarioBreeze VAV valves
CO2 sensors from Jablotron
BoostButton chips
antistatic flexi air ducts in green.
Each ventilation unit performs its own functions. The first focuses on carbon dioxide (CO2) indicators and works only for the gallery. This is how we globally control the level of CO2 throughout the room.
The second ventilation unit is responsible for the air exchange in the store during its operation (from 9:00 to 18:00) and in the gallery - if necessary. It was with her help that we implemented a variable air supply system on VAV valves.
HOW THE VARIABLE AIR SYSTEM WORKS
The system is built on the principle of zoning: each zone is assigned a certain number of valves (depending on the required air volume. There are VAV valves that are responsible for the amount of air supplied to clean zones (the valves are controlled by CO2 sensors) and VAV valves programmed for air extraction from dirty areas (controlled by BoostButton chips).
Each zone is served by its own valves - both for supply and exhaust air.
Air supply
The volume of air supplied is regulated by CO2 sensors and VAV valves: when the level of carbon dioxide changes, the sensors transmit a signal to the valves, and the valves to the installation. Depending on the information received, the unit increases/reduces the volume of supplied air and, if necessary, regulates its power. The parameters of the required level of carbon dioxide are set independently.
Air is supplied to the store at the rate of 240 m3/h, but the system allows you to increase this volume to 450 m3/h.
CO2 sensors will be installed at the entrance to the gallery and the store.
When the store closes, the CO2 sensor detects a significant decrease in carbon dioxide levels, which indicates that there are no people there. Accordingly, the VAV valves are also closed. The unit reduces power to minimum speed.
If at this time there is an event with a large number of people in the gallery, all the air that we previously sent to the store is transferred to the gallery. Then the installation continues to operate in normal mode or increases power.
The gallery can receive from 440 to 880 m3/hour of air.
Exhaust air extract
When a visitor enters the bathroom, he presses the light switch, where the BoostButton chip is embedded. At the same moment, the VAV valves that supply air close slightly, and the valves programmed for exhaust begin to forcefully draw air from the bathroom.
According to the set timer, after a certain time, the air extraction stops and all VAV valves return to their original position, dictated by the sensors. This is how we achieve a balance: the volume of air extracted is always equal to the volume of air supplied.

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