23 - pccw hong kong test 0404

7/31/2019 23 - PCCW Hong Kong Test 0404

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AN

EVALUATION

OF

THE EFFECTS OF

PERMAFROST TREATMENT

FOR

ON A

CARRIER30GBWATERCHILLER

AT THE

PCCWEXCHANGE BUILDING

TAI PO MARKET,HONGKONG,SAR


2/17

INTRODUCTION

The aim of this report is to examine the effects of a product known as PermaFrost

upon one of the refrigeration circuit of the air-cooled Carrier 30BG060012E water

chiller at the PCCW Building, Hong Kong.

PermaFrost has previously been claimed to enhance the performance of refrigeration

and air conditioning systems elsewhere. Literature from the Polar Oil Company

(which markets the product) states that PermaFrost a molecular technology that

relies on highly activated thermal conductive compounds - will improve heat transfer

on metal surfaces and increase lubricity of the refrigerant oil.

It further states: When PermaFrosts Thermo-Conductive compound is added to the

compressor, it blends with the oil and moves through the system. As each molecule

attaches itself to metal surfaces within the system, it displaces dirt, carbon deposits,

and stagnant oils, eventually forming a thin layer. As a result, the system can move

more heat for the same amount of compressor action. Energy demand and

consumption can be reduced.


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4/17

RESULTS OF TESTING

Detailed results of the operating conditions are provided in the following charts, all

found in Appendix A:

1. Pre-treatment Test (February 23 - 24, 2004)

Chart 1A: Cooling Capacity, Power Input & Coefficient of Performance

Chart 1B: Discharge, Condensing, & Evaporating Temperatures, Superheat and

Subcooling

Chart 1C: Evaporator & Condenser Pressures

2. Post-treatment Test (April 18 - 19, 2004)

Chart 2A: Cooling Capacity, Power Input & Coefficient of Performance

Chart 2B: Discharge, Condensing, & Evaporating Temperatures, Superheat and

Subcooling

Chart 2C: Evaporator & Condenser Pressures

Observations

A comparison of the mean operating conditions for each of the tests are summarised

in table below:

Test Results : Operating Mean Values

Pre-treatment Post-treatment % change

Cooling Capacity (kW) 88.66 102.41 15.5

Power Input (kW) 31.10 31.08 -0.06

Coefficient of Performance, COP 2.85 3.32 16.5

Discharge Temperature (C) 93.42 96.30 0.03

Evaporating Temperature (C) -1.04 -4.31 -314

Condensing Temperature (C) 46.39 46.40 0.02Liquid Subcooling (K) 18.96 12.85 -32.2

Suction Superheat (K) 5.80 10.02 72.8

Condensing Pressure (bar) 16.85 16.86 0.06

Evaporating Pressure (bar) 3.81 3.31 -13.1


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From this table, a number of observations can be made about the effects of

PermaFrost on the chiller:

Cooling capacity increased by 15.5 % in the post-treatment test. This indicates asignificant improvement in heat transfer in the evaporator.

The COP (a ratio of the cooling capacity and power input) increased by 16.5% inthe post-treatment test. This indicates a significant improvement in the overall

system performance.

The decrease in the evaporating temperature and pressure further indicatessignificant improvement in heat transfer in the evaporator.

The decrease in the liquid subcooling and increase suction superheat in the testsdo not appear to have impact on the system performance.

The changes in power input and compressor discharge temperatures wereinsignificant.

CONCLUSION

The tests carried out on the chiller indicated an improvement in the cooling capacity

of 15.5% and an overall increase in system performance of 16.5 % after treatment

with PermaFrost. The increase in cooling capacity and system performance will

result in the compressor using less energy to achieve the same cooling effect on

the chilled water as prior to treatment with Permafrost. The decrease in energy

usage by the compressor will correspond approximately to the increase in the system

performance. This is achieved by a reduction of the compressor run time to produce

the same cooling effect on the chiller.

The salient results are summarised in the bar graphs in Appendix B.


6/17

Copyright: enACon Limited, Hong Kong

Polar Oil Company, Australia

Pre Treatment Test

February 23-24, 2004

Appendix A


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Chart 1A - Carrier Chiller at PCCW: Operating Cooling Capacity, Power Input & COP ( Pre- treatment

)

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

21:00

21:14

21:28

21:42

21:56

22:10

22:24

22:38

22:52

23:06

23:20

23:34

23:48

0:02

0:16

0:30

0:44

0:58

1:12

1:26

1:40

1:54

2:08

2:22

2:36

2:50

3:04

3:18

3:32

3:46

4:00

4:14

4:28

4:42

4:56

5:10

5:24

5:38

5:52

Feb 23 - 24, 2004

V

alue

Cooling Capacity [ Mean value: 88.66 kW ]

Power Input [ Mean value: 31.10 kW ]

COP [ Mean value: 2.85 ]


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Chart 1B - Carrier Chiller at PCCW: Operating Temperatures ( Pre- treatment )

-5

5

15

25

35

45

55

65

75

85

95

21:00

21:14

21:28

21:42

21:56

22:10

22:24

22:38

22:52

23:06

23:20

23:34

23:48

0:02

0:16

0:30

0:44

0:58

1:12

1:26

1:40

1:54

2:08

2:22

2:36

2:50

3:04

3:18

3:32

3:46

4:00

4:14

4:28

4:42

4:56

5:10

5:24

5:38

5:52

Feb 23 - 24, 2004

Temperature[C]

Discharge Temp [ Mean value: 93.42C ]

Condensing Temp [ Mean value: 46.39C ]

Evaporating Temp [ Mean value: - 1.04C ]

Superheat [ Mean value: 5.80K ]

Subcooling [ Mean value: 18.96C ]


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Chart 1C- Carrier Chiller at PCCW: Operating Pressures ( Pre- treatment )

0

2

4

6

8

10

12

14

16

18

21:00

21:14

21:28

21:42

21:56

22:10

22:24

22:38

22:52

23:06

23:20

23:34

23:48

0:02

0:16

0:30

0:44

0:58

1:12

1:26

1:40

1:54

2:08

2:22

2:36

2:50

3:04

3:18

3:32

3:46

4:00

4:14

4:28

4:42

4:56

5:10

5:24

5:38

5:52

Feb 23 - 24, 2004

Pressure[Bar]

Evaporating Pressure [ Mean value: 3.81 Bar ]

Condensing Pressure [ Mean value: 16.85 Bar ]


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Post Treatment Test

April 18-19, 2004

Appendix A


11/17



Chart 2A - Carrier Chiller at PCCW: Operating Cooling Capacity, Power Input & COP ( Post-

treatment )

0.00

20.00

40.00

60.00

80.00

100.00

4:43:01

5:01:01

5:19:16

5:37:21

5:55:16

6:13:16

6:31:16

6:50:11

7:08:46

7:27:26

7:46:11

8:05:01

8:22:06

8:40:45

8:59:26

9:17:25

9:35:45

9:53:41

10:11:31

10:29:46

10:48:06

11:05:46

11:24:11

11:41:51

11:58:51

12:16:10

12:33:56

12:51:56

13:09:36

13:26:16

13:43:51

14:01:31

14:18:51

14:36:31

14:53:36

15:10:51

15:28:16

15:45:56

April 18 - 19, 2004

Value

Cooling Capacity [ Mean value: 102.41 kW ]

Power Input [ Mean value: 31.08 kW ]

COP [ Mean value: 2.85 ]


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Chart 2B - Carrier Chiller at PCCW: Operating Temperatures ( Post- treatment )

-5

15

35

55

75

95

4:43:01

5:01:01

5:19:16

5:37:21

5:55:16

6:13:16

6:31:16

6:50:11

7:08:46

7:27:26

7:46:11

8:05:01

8:22:06

8:40:45

8:59:26

9:17:25

9:35:45

9:53:41

10:11:31

10:29:46

10:48:06

11:05:46

11:24:11

11:41:51

11:58:51

12:16:10

12:33:56

12:51:56

13:09:36

13:26:16

13:43:51

14:01:31

14:18:51

14:36:31

14:53:36

15:10:51

15:28:16

15:45:56

April18 - 19, 2004

Temperature[C]

Discharge Temp [ Mean value: 96.30C ]

Condensing Temp [ Mean value: 46.40C ]

Subcooling [ Mean value: 12.85C ]

Superheat [ Mean value: 10.02 K ]

Evaporating Temp [ Mean value: - 4.31C ]


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Chart 2C - Carrier Chiller at PCCW: Operating Pressures ( Post - treatment )

0

2

4

6

8

10

12

14

16

18

20

4:43

:01

5:01

:01

5:19

:16

5:37

:21

5:55

:16

6:13

:16

6:31

:16

6:50

:11

7:08

:46

7:27

:26

7:46

:11

8:05

:01

8:22

:06

8:40

:45

8:59

:26

9:17

:25

9:35

:45

9:53

:41

10:11:31

10:29:

46

10:48:06

11:05:

46

11:24:11

11:41:51

11:58:51

12:16:

10

12:33:56

12:51:56

13:09:36

13:26:

16

13:43:51

14:01:31

14:18:51

14:36:31

14:53:36

15:10:51

15:28:

16

15:45:56

April 18-19, 2004

Pressure[Bar]

Condensing Pressure [ Mean value: 16.86 Bar ]

Evaporating Pressure [ Mean value: 3.31 Bar


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Performance

Comparison

Pre: February 23-24, 2004

&

Post: April 18-19, 2004Appendix B


15/17



Comparison of Cooling Capacity resulting from treatment with PermaFrost

80

85

90

95

100

105

Pre-treatment Post-treatment

CoolingCapacity(kW)

Cooling Capacity (kW)


16/17



Comparison of COP resulting from treatment with PermaFrost

2.6

2.7

2.8

2.9

3

3.1

3.2

3.3

3.4

Pre-treatment Post-treatment

CoefficientofPerformance,

COP

Coefficient of Performance, COP


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Comparison of Performance of Chiller resulting from treatment with PermaFrost

0

20

40

60

80

100

120

Cooling Capacity (kW) Power Input (kW) Coefficient of Performance, COP

Valu

e

Pre-treatment

Post-treatment

23 - pccw hong kong test 0404

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