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mahmud.kamal
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Engineering Fields - Mechanical Engineering - New Member

Join Date: Apr 2020
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Chiller COP Calculation

04/20/2020 9:47 PM

How to calculate the COP from the below info:

Chiller Model- RTAC 275

Chiller Serial No- EKR 2721

Ambient/Outdoor temp- 32.9C

Evaporator rfgt pressure- 240 kPa

Condenser rfgt pressure- (ckt1-1388.281 kPa, ckt2- 281kPa)

Evaporator inlet temp – 9.2C

Evaporator outlet temp- 6.5C

Unit total Amp- 1A (158,155,148), 1B (93,90,86), 2A(0,0,0)

Unit voltage- 396V
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SolarEagle
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#1

Re: Chiller COP calculation

04/20/2020 10:30 PM

https://theengineeringmindset.com/chiller-efficiency-calculate/

https://www.trane.com/content/dam/Trane/Commercial/lar/br/produtos-sistemas/equipamentos/Chillers/Chillers_Parafuso/Condensacao_Ar/RTAC-Serie_R/RTAC_Plus-Nacional/Catalogo_Produto-RTAC(RLC-PRC001B%20EN)%20small.pdf

cop= 3.414

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PWSlack
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#2

Re: Chiller COP calculation

04/21/2020 2:54 AM

One cannot.

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PWSlack
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#3

Re: Chiller COP calculation

04/21/2020 3:47 AM

How about calling Trane and discussing the problem with the experts?

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Anonymous Poster #1
#4

Re: Chiller COP calculation

04/21/2020 3:49 AM

Duplicate thread.
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Tornado
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#5

Re: Chiller COP calculation

04/21/2020 3:58 AM

The condensing pressure of 281 kPa does not seem right (should be higher).

What are the nominal voltage and frequency of this system?

The voltage and amperages give the kVA usage, but not kW usage, unless power factor (cos φ) is known.

What does circuit 2A ((0,0,0) amps) do? Fans, maybe?

The water in and out, and ambient, temperature do make sense.

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Tornado
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#6

Re: Chiller COP Calculation

04/22/2020 1:45 AM

From the standpoint of designing or selecting a system, COP will be improved by increasing the heat exchange areas of evaporator and condenser, and maybe by choice of refrigerant.

For an existing system, one must look instead for fouling of evaporator and/or condenser surfaces, and take corrective action. On the refrigerant side, the main risk is air (or other noncondensable gases) in the system. On the water side of the evaporator, there could be mineral scale, algae, fungi, dust, etc. On the air side of the condenser, there could be dust, feathers, insects, leaves, etc. In all of these cases, clean away whatever foreign substances may be present.

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