Air Chiller

[lana]

In order to get 9°C outlet temperature, the face velocity must be reduced. So the coil dimension must be bigger.
110 x 65 cm , 8 rows , 10 FPI

On the other hand in order to cool 3000 CFM of 40°C/32°C air to 9°C/8.9°C you have to have around 142 kW of capacity.
It is a simple psychrometric calculation which gives you this capacity.
Q = m x Dh
Q = capacity needed (kW)
m = air mass flow rate (kg/s)
Dh = air enthalpy difference (kJ/kg)

Q = 1.69 [kg/s] x (111.26 - 27.11) [kJ/kg] = 142 kW
But you said that the compressor has 22 kW of capacity.

Because there is no return air so the capacity is huge. This needs something like a 60HP of compressor.

Please verify the info.

About the well water, because the cooling tower is cooling the water then there must be no problem about the pit water getting hot.
I suggest you check the cooling cycle first. Maybe there are some commissioning problems like refrigerant charge or ....
The problem you mentioned about the high pressure needs careful investigation to find the cause. First thing I would look at is the suction pressure. If suction pressure starts to go up because of high load the discharge pressure will go up as well.

Good luck .
Keep us posted.
Regards
LANA

[Sledge]

In order to get 9°C outlet temperature, the face velocity must be reduced. So the coil dimension must be bigger.
110 x 65 cm , 8 rows , 10 FPI

On the other hand in order to cool 3000 CFM of 40°C/32°C air to 9°C/8.9°C you have to have around 142 kW of capacity.
It is a simple psychrometric calculation which gives you this capacity.
Q = m x Dh
Q = capacity needed (kW)
m = air mass flow rate (kg/s)
Dh = air enthalpy difference (kJ/kg)

Q = 1.69 [kg/s] x (111.26 - 27.11) [kJ/kg] = 142 kW
But you said that the compressor has 22 kW of capacity.

Because there is no return air so the capacity is huge. This needs something like a 60HP of compressor.

Please verify the info.

About the well water, because the cooling tower is cooling the water then there must be no problem about the pit water getting hot.
I suggest you check the cooling cycle first. Maybe there are some commissioning problems like refrigerant charge or ....
The problem you mentioned about the high pressure needs careful investigation to find the cause. First thing I would look at is the suction pressure. If suction pressure starts to go up because of high load the discharge pressure will go up as well.

Good luck .
Keep us posted.
Regards
LANA

Cheers Lana

dont want to hijack thread, but can you tell me where you get these facts and figures, I am accumulating as much refernce material as I can find, to start my own self education program.

[Sledge]

A thought about the sump, cooling tower, condensor arrangement.

I am thinking that the inlet to the condensor should be from the well, and the water leaving the condensor should feed directly to the cooling tower. The cooling tower would then drain into the well. I am viewing this as a circuit, that would make the well an extension of the cooling tower sump.