Choose right water condenser for my ciller Wesper WLS 1004 ELN

 
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Old 08-28-2013, 05:08 PM   #1
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Choose right water condenser for my ciller Wesper WLS 1004 ELN


Hi
I need advice of professionals to have answer at questions:

1) How much power (kW) should have heat exchanger to cool down refrigerant on high side?
2) How much water could be heated in 1 hour from 65F to 104 F?

Here is Chiller Wesper WLS 1004 ELN documentation: http://www.wesper.com/fichiers/Site%..._vls_w_6gb.pdf

It has 4 Copeland scroll compressors ZR310KCE, 25HP each compressor.
Documentation of compressor: http://www.elektronika-sa.com.pl/tcm...=4&Tab=2&LID=2

For this project we planed to use two heat exchangers for each circuit (Wesper has two refrigerant circuits, two compressors on each side)
Known parameters:
Assuming that 1 compressor on each circuit will run all time.
Refrigerant: R407c
Refrigerant high side temperature: 150F
Refrigerant boiling temperature: 41 F
Chiller cold water set temperature: 48 F
Considering water temperature entering in heat exchanger (condenser unit): 65 F
Desired water temperature after heat exchanger (condenser unit): 104 F

Any advice will be appreciated.
Thank you


Last edited by AlexGe; 08-28-2013 at 05:24 PM.
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Old 09-08-2013, 06:40 AM   #2
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Re: Choose right water condenser for my ciller Wesper WLS 1004 ELN


Roughly 935 gallons an hour, if the compressor is working at full load.
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Old 09-10-2013, 04:00 PM   #3
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Re: Choose right water condenser for my ciller Wesper WLS 1004 ELN


Thank you for answer.
Could you be so kind and tell me how you determine that?
From compressor technical data: Displacement [m/h]:71,4
The chiller has TEV model: Danfoss TEZ 55 , it will reduce total flow rate of system.
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Old 09-10-2013, 04:14 PM   #4
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Re: Choose right water condenser for my ciller Wesper WLS 1004 ELN


25 HP equals 300,000 BTUs.

Desired water temp of 104F minus entering water temp of 65F equals 39F delta.

1 BTU to raise or lower 1 pound of water 1F

300,000 divided by 39 equals 7,692 pounds of water heated to 104F.

7,692 divided by 8.22(pounds of water per gallon) equals 935 gallons of water an hour.

I probably should have used 8.33 pounds per gallon(since the entering water temp is 65). That changes the answer to 923 gallons an hour.
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