Appendix I

Additional Information on the Proposed Methodology“Energy Saving by Introduction of High Efficiency Centrifugal Chiller”

1. Market share of chiller manufacturer in Thailand
In Thailand, the American manufacturers, such as Company A, Company B, and Company C, aredominant in the centrifugal chillers market according to a news article published by JARN1 in 2014
and an interview with a Japanese manufacturer, KOBELCO.

2. Research on the COP values of chillers in Thailand
2.1

Catalogue COP values

Catalogue COP values of centrifugal chillers sold in Thailand are collected on the web.
In the case of new installation, it is possible to assume that centrifugal type chiller ofCompany A, Company B and Company D, are chosen. This is because the survey showsthat company C probably has a refrigerant that is going to be phased out by MontrealProtocol. Company D is a Japanese major chiller manufacturer and also selling chillers in Thaimarket
As a result, 14 COP values of non-inverter type centrifugal chiller from Company A, total 49
COP values of inverter type including 26 from Company B and Company D, are ranging from 250
USRt to 1,500 USRt in Thai are obtained.

2.2

Standardized COP* values and determination of the reference COP values

COP values of centrifugal chillers marketed in Thailand are calculated from values of the 63
catalogue data (14 non-inverter type and 49 inverter type) by manufacturer’s testing based on
industrial standards2 and standardized with the equation as indicated in the proposed methodology.
These are summarized in Table 1 and Table 2 below.
*Standardized COP is calculated based on the same manner stated in Criterion 2 on the proposed
methodology

It is observed that COP values of non-inverter type (Table 1) show higher efficiency than those of
inverter type (Table 2). Therefore, the reference COP values are determined by the types of chillers,
1Japan Air Conditioning, Heating & Refrigeration News: First published in February 1969, JARN
is the only English magazine published in Japan that covers worldwide information about HVAC&R
industry/market, products, new technology, major trade shows and various promotional activities by
the global industry leaders through its long-standing information network.
(https://www.ejarn.com/about.aspx)
2 JIS B 8621:2011 Centrifugal Water Chillers, ANSI/AHRI 550/590-2011: Performance Rating ofWater-Chilling and Heat Pump Water-Heating Packages Using the Vapor Compression Cycle
1

Appendix Iinverter and non-inverter.
2.2.1 The reference COP values of non-inverter type
For non-inverter type, however COP value varies according to cooling capacity, it is observed thatthose COP values with cooling capacity of less than 400 USRt show clearly smaller than thoseranging more than 400 USRt. Therefore, two cooling capacity ranges are set to determine thereference COP values for each range.
The most efficient COP, which has the largest value, in each capacity range is selected
as the reference COP and shown in Table 1 below in red circles.

COP
6.3

max: 6.19

6.1

max: 5.67

5.9
5.7
5.5
5.3
5.1
4.9

Company A

4.7
4.5
0200

400

600

800

1000

1200

1400Cooling Capacity [USRt]

Figure 1: COP values of non-inverter type centrifugal chiller marketed in Thailand
The reference COP of non-inverter type for each cooling capacity range is determined andshown in Table 1 below. (“x” in the table represents cooling capacity per unit.)
Table 1: Established COPre,i of non-inverter type for the proposed methodology

Cooling capacity per unit (USRt)

COP*

250≦x<400400≦x≦1,220

5.67

6.192

Appendix I

2.2.2 The reference COP values of inverter typeFor inverter type, it is observed that similar COP values fall into a certain cooling capacity range.
Therefore, four cooling capacity ranges are set to determine the reference COP values for each range.
The most efficient COP, which has the largest value, in each capacity range is selected
as the reference COP and is shown in Table 2 below in red circles.

COP
6.3

450 550825

1,500max: 6.06

6.1max: 5.85
5.9max: 5.59

5.7max:
5.69

5.5
5.3
5.1
4.9

Company B

4.7

Company D

4.5
0200

400

600

800

1000

1200

1400

1600

Cooling Capacity [USRt]

Figure 2: COP values of inverter type centrifugal chiller marketed in Thailand
The reference COP of inverter type for each cooling capacity range is determined and shown inTable 2 below. (“x” in the table represents cooling capacity per unit.)
Table 2: Established COPre,i of inverter type for the proposed methodology

Cooling capacity per unit (USRt)

COP*300≦x≦

450<x≦

550<x≦

825<x≦

450

550

825

1,500

5.59

5.69

5.85

6.063