Appendix I

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

1. Market share of chiller manufacturer in Vietnam
In Vietnam, the American manufacturers, such as Company A, Company B, and Company C,
occupy high market share in chillers market and Japanese manufacturers, such as Company D has
started to gain a certain proportion of share according to the market report1 and an interview with atechnical expert of chillers in Japan.

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

Catalogue COP values

However the market size of centrifugal chiller is very small at the moment, it is expected that it
will expand in Vietnam as its economy grows. It is also expected that the same chiller manufacturers
who already have certain market share of other chiller types (e.g. screw chiller) will continue tooccupy high market share in centrifugal chiller market in the future. Therefore, catalogue COP
values of centrifugal chillers sold by those manufacturers are collected on the web.
In the case of new installation, it is possible to assume that centrifugal type chiller of Company A,Company B, Company C and Company D, are chosen. In this methodology, only centrifugal typechiller of Company B and Company D are suitable. This is because the survey shows that company
C probably has a refrigerant that is going to be phased out by Montreal Protocol. Centrifugal chillersof Company A are also excluded since Company A only sells non-inverter type centrifugal chillers in
the market while the proposed methodology only covers inverter type centrifugal chiller as a projectchiller.

As a result, total 49 COP values of inverter type including 26 from Company B and Company D,
are ranging from 250 USRt to 1,500 USRt are obtained.

2.2

Standardized COP* values and determination of the reference COP values

COP values of centrifugal chillers marketed in Vietnam are calculated from values of the 49
catalogue data by manufacturer’s testing based on industrial standards2 and standardized with theequation as indicated in the proposed methodology. Standardized COP values are plotted in Figure 1below.
*Standardized COP is calculated based on the same manner stated in Criterion 2 on the proposed
Chapter 2.8.4 Vietnam, BSRIA Global Market Report on Chillers, BSRIA (BuildingServices Research and Information Association), 2016/11/24
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
11

Appendix I

methodology

It is observed that similar COP values fall into a certain cooling capacity range. Therefore, fourcooling capacity ranges are set to determine the reference COP values for each range. The mostefficient COP, which has the largest value, in each capacity range is selected as the reference COP
and is shown in Table 1 below in red circles.

COP
6.3

450 550825

1,500max: 6.06

6.1

max: 5.85
5.9max: 5.59

5.7

max:
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 1: COP values of inverter type centrifugal chiller marketed in Vietnam
The reference COP for each cooling capacity range is determined and shown in Table 1 below. (“x”in the table represents cooling capacity per unit.)

Table 1: Established COPRE,i for the proposed methodology
Cooling capacity
per unit (USRt)
COPRE,i300≤x<450450≤x<550550≤x<825

5.59

5.69

5.85

*1 USRt = 12,000 BTU/hr = 3.52 kW

2825≤x≤1,5006.06