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OASIS cooling kit: the perfect solution for air conditioning beyond the units’ operating limits.

Kit 1

Especially in harsh climates, with requirements of prolonged operation at high ambient air temperatures, units can benefit from devices offering additional cooling whenever outdoor conditions become critical.

The ideal solution in these situations is to lower the condenser coil entering air temperature when it is becomes too high, causing the condensing temperature to go over the compressors operating limits. This is obtained by Climaveneta with the Oasis kit option.

How Oasis kit works

Kit 2

When the condensing conditions reach a pre-defined set point, the controller open a solenoid valve and water is sprayed over a
Plastic net. The contact between the airflow forced through the wet plastic net, reduces the condenser coil inlet air temperature. This allows:

1) A further extension of the operating limits by 5-6 °C, depending on the relative humidity.
2) A benefit for the silenced version (because the high condensing
control can be postponed to higher temperature).
3) Increased efficiency of the unit when the system is active.

Climaveneta's system advantages vs traditional solutions

Kit 2

The Climaveneta Oasis solution offers many advantages even if compared to systems with pressurized atomizers which spray water directly to the coil:

- No dedicated pumps: the water is taken direktly from tap water.
- No limestone on the coil: the water is sprayed toward the plastic net, and not toward the coil.
- Easy application - it's possible to use common supply water, no need of special water treatment.
- Minimized risk of bacterial population increase: recirculated water loop does not exist; water immediately evaporates when sprayed on the net.
- Optimal control of water consumption: thanks to effective spray regulation.

Oasis kit performances

The table shows the effects of Oasis kit in relation with outside air temperature and relative humidity. It is clear that, the higher the air temperature and lower the air humidity, the higher the system’s effectiveness: in these conditions infact, as higher waterflow is sprayed to the net, and most of it evaporate thanks to the energy given by the airflow through the net, water evaporates and air is cooled.

Relative humidity outdoor air
[%]
Ambient air temperature, dry bulb
[°C]
Delta T inlet condenser coil temperature
[°C]
Water consumption for 1000m³/h air flow
[l/h]
30 35 6 5,1
40 6,5 5,6
45 7,5 6,1
40 35 5 4
40 5,5 4,6
45 6 5,2
50 35 4,5 3,3
40 5 3,7
45 5 4,1
60 35 3,5 2,3
40 4 2,6
45 4,5 2,8
70 35 3 1,4
40 4 1,6
45 4 1,7

Table n.1 - Impact of Oasis on the condensation and operational limits

Water consumption comparison

Water1 Adiabatic cooling kit coupled with an air cooled chiller (260 Kw @ 12/7°C, 35°C, 50% RH) Water2 Cooling tower coupled with a water cooled chiller (260 Kw @ 12/7°C, 30/35°C, 50% RH)

Another point to highlight is the water consumption, which is less than the 30% of the one that requested by a cooling tower coupled to a water cooled unit of the same cooling capacity.