Bureau of Energy Efficiency
Page 1
Schedule – 21 14
th
September, 2018
Chillers
1. SCOPE
This schedule specifies the energy-labelling requirement for chillers working on
vapour compression cycle, manufactured in India or imported for sale in India for
central cooling and similar use. The schedule covers all types and sizes/capacity for
rated voltage up to and including 250 V, 50 Hz AC, for single phase and up to and
including 11kV, 50Hz AC for three phase power supply covered under the scope of IS
16590.
For this schedule, the star rating shall be based on Indian Seasonal Energy Efficiency
Ratio (ISEER) and full load COP as the prequalification criteria.
This schedule does not apply to:
a) Chillers working on vapour absorption refrigeration cycle
b) Packages with Condensing unit provided with Heat reclaim;
c) Systems with remote condensing unit;
d) Systems with Evaporative cooled condenser;
e) Condenser less chillers; and
f) Heat pumps
2. NORMATIVE REFERENCES
This schedule shall be read in conjunction with the following standard with all
amendments, for the purpose of star labelling: -
Number Standard
1. IS 16590 : 2017 Water-cooled Chilling Packages Using the Vapour
Compression Cycle− Specification
3. TERMINOLOGY
For the purpose of this schedule, the following definitions in addition to those specified
in IS 16950 shall apply. However, in case of dispute, the definitions given in IS 16590
shall prevail.
3.1. Bubble Point
Refrigerant liquid saturation temperature at a specified pressure. It is the temperature
at which the first bubble of vapour forms in liquid refrigerant (saturated liquid).
Bureau of Energy Efficiency
Page 2
3.2. Condenser
A refrigeration system component which condenses refrigerant vapour. Sub-cooling of
the refrigerant may occur as well.
3.2.1. Air Cooled Condenser
A refrigeration system component that condenses refrigerant vapour by rejecting heat
to air circulated over its heat transfer surface causing a rise in the air temperature. Sub-
cooling of the refrigerant may occur as well.
3.2.2. Water-Cooled Condenser
A component which utilizes refrigerant-to-water heat transfer means, causing the
refrigerant to condense and the water to be heated. Sub cooling of refrigerant may occur
as well.
3.3. Condenser Heat Rejection Capacity
The heat removed by the heat transfer medium of the condenser per unit of time (kW).
3.4. Cooling Capacity
Heat given off from the liquid to the refrigerant per unit of time, (kW)
3.5. Coefficient of Performance (COP)
A ratio of the cooling capacity in kilo watts to the total power input in kilo watts.
Note: Definition of COP refers to chilling units only.
3.6. Dew Point
Refrigerant vapour saturation temperature at a specified pressure. It is the temperature
at which the first droplet of liquid forms in refrigerant vapour (saturated vapour). The
evaporating and condensing temperatures should correspond to the mean of bubble and
dew points.
3.7. Fouling Factor
The thermal resistance due to fouling on the fluid side of the heat transfer surface
(m
2
°C /kW).
3.8. Fouling Factor Allowance
Provision for anticipated fouling during use, specified in (m
2
°C /kW)
3.9. Liquid-Chilling Packages
A refrigeration machine using the vapour compression cycle.
NOTE: Liquid-chilling packages may be operated with any type of compressor and
be equipped with air-cooled and liquid-cooled, condensers. Liquid chilling packages
can be supplied with or without pumps.
Bureau of Energy Efficiency
Page 3
3.10. Liquid Refrigerant Temperature
Temperature of the refrigerant entering the expansion device (°C).
3.11. Basic Model Group [BMG] :
A BMG is a set of models that share characteristics which allow the performance
of one model to be generally representative of the performance of other models
within the group. This group of products does not necessarily have to share
discrete performance.
3.12 Performance Rating
Performance data over the operating range of the unit at various load in the form of
performance curves or catalogue or output from a computer selection code or as per
labelling process defined in this schedule.
NOTE: The published ratings are the ratings declared by the manufacturer in any form
as defined.
3.11.1. Standard Rating
A rating based on standard rating conditions. (See table 1)
3.11.2. Application Rating
A rating based on Application Rating Conditions other than Standard rating conditions.
3.12. Standard Barometric Pressure
Barometric pressure of 101.325 kPa.
3.13. Total Power Input of the System
Power input of all components of the unit in operation shall include:
3.13.1. The power input for operation of the compressor (kW)
3.13.2. The power input of all controls, safety devices, starters, and drives of the unit,
including devices necessary for correct operation of the refrigerating circuit (for
example oil pump, refrigerant pump) (kW).
3.13.3. The power for fans for air cooled liquid chillers (kW).
4. COMPANY REGISTRATION
For participating in the Chiller Star Rating program, the manufacturer has to
first register his organization. The manufacturer shall submit to BEE all
necessary documents required as per BEE guidelines. BEE after scrutiny and
subject to submission of all documents by the manufacturers shall grant
company registration to the organization/manufacturers to participate in BEE
Chiller labelling program.
Bureau of Energy Efficiency
Page 4
5. MODEL REGISTRATION
For registration of a chiller Basic Model Group /model under BEE chiller star
rating program, the manufacturer shall submit following documents:-
5.1 Declaration of basic model group, including manufacturers
energy performance software reports for all the chillers in the
Basic Model Group using the tool/software approved by AHRI
/ EUROVENT/ILAC/APLAC/COFRAC/NABL.
5.2 One physical test report of a chiller from each BMG containing
the COP at 25%,50/%,75% and 100% load, ISEER value as
per the test conditions mentioned in IS 16590 along with
application for the label.
Additionally, the manufacturers may also register a single chiller model
under star labelling program, with a physical test report from
NABL/ILAC /APLAC accredited lab tested as per the test conditions
mentioned in IS 16590. In the absence of above, BEE may also accept
test report from a Test facility accredited by
AHRI/EUROVENT/COFRAC etc. having scope of accreditation
including the tests mentioned in IS 16590 standards, subject to the
conditions that such labs get their lab accredited by their national
accreditation body, for tests mentioned as per IS 16590 within a period
of one year.
6. TESTING GUIDELINES
The energy performance software report, mentioned at 5.1, shall also contain
the COP values at 25 percent, 50 percent,75 percent and 100 percent load and
ISEER value as per the test methods and test conditions mentioned in IS 16590.
The physical test report should contain the results of the following parameters
in accordance with the test conditions mentioned in IS 16590: -
1. Cooling capacity
2. Power consumption
All the above tests shall be conducted as per the IS 16590. All the measuring
instruments shall have accuracy as per clause 10 of IS 16590. The chillers shall
also meet Construction and safety requirements as per clause 5.1 and 5.2 of IS
16590. The performance test shall be conducted in the standard rating
conditions mentioned in the following table:-
Bureau of Energy Efficiency
Page 5
Standard rating conditions
Table 1 Standards rating conditions
Liquid-cooled Air-cooled
1. Liquid / Air cooled condenser
Entering temperature 30 °C Not applicable
ΔT 5 °C Not applicable
Liquid-side fouling factor
allowance
Nominal 0.088 m
2
°C/kW
Not applicable
Not applicable 39°C
Air side fouling factor Not applicable 0.000m
2
.deg C/kW
2. Evaporator Liquid temperature
Leaving 7 °C
T 5 °C
Evaporator fouling factor allowance :
Liquid side Nominal 0.044 m
2
°C /kW
Barometric pressure 101.325 kPa
The manufacturer shall submit the results of physical test on the prescribed format as
given in Annexure B of this Schedule. In addition to the test report, manufacturer shall
also submit the data recorded for capacity tests as described in Table 6 of IS16590.
Bureau of Energy Efficiency
Page 6
6.1 Acceptance of Test Report from Overseas Laboratories:
BEE shall accept the overseas lab test report for chillers manufactured overseas
subject to fulfilling the following requirements:
1) International laboratory shall be accredited by the accreditation body of
respective country and the accreditation body shall be the member of
ILAC/ APLAC.
2) International laboratory shall be accredited under scope of IEC/ ISO 17025 or
equivalent.
3) Scope of accreditation shall cover testing as per IS 16590 and also include
all relevant tests as specified in the schedule.
In the absence of above, BEE may also accept test report from a Test facility
accredited by AHRI/Eurovent/COFRAC etc. having scope of accreditation
including the tests mentioned in IS 16590 standards subject to the conditions that
such labs get their lab accredited by their national accreditation body, for tests
mentioned as per IS 16590 within a period of one year.
6.2 TOLERANCE LIMIT (Applicable for Check Testing)
a) The tolerances for COP (full load and part load), Cooling Capacity (full load
and part load) and ISEER shall be as per IS 16590.
b) There shall be no negative tolerance for the star rating levels and all tested
equipment shall meet the minimum threshold for each star rating level.
7 PRE-QUALIFICATION
The chillers shall comply prequalification criteria i.e., every model shall achieve
following minimum COP irrespective of the star level to become eligible for star rating
plan,
Minimum COP for water cooled (for 100% Load) (Table 2)
kW of cooling COP required
<260 4.2
>=260 &<530 4.7
>= 530 &<1050 5.0
>=1050 &<1580 5.2
>=1580 5.6
Bureau of Energy Efficiency
Page 7
Minimum COP for air cooled ( for 100% Load) ( Table 3 )
kW of cooling Minimum COP required
<260 2.4
>=260 2.6
8 STAR RATING PLAN
The water cooled condenser and air cooled condenser chillers shall meet the
requirement of ISEER as per the Tables 4 and 5. The star level chosen for the models
shall be based on minimum and maximum limits of their relative energy efficiencies
of each star level band specified in Table 4 & Table 5.
Table 4: Star Rating levels for water cooled
Table Validity Period
1
st
January 2019 to 31 December 2020
kW of cooling ISEER
1 Star 2 Star 3 Star 4 Star 5 Star
<260 4.80 5.20 5.60 6.10 6.60
>=260 & <530 5.00 5.60 6.20 6.80 7.40
>= 530 & < 1050 5.50 6.10 6.70 7.40 8.20
>= 1050 & <1580 5.80 6.50 7.20 7.90 8.70
>=1580 6.00 6.70 7.40 8.20 9.00
Table 5: Star Rating levels for air cooled
Table Validity Period
1
st
January 2019 to 31 December 2020
kW of cooling ISEER
1 Star 2 Star 3 Star 4 Star 5 Star
<260 3.00 3.30 3.60 4.00 4.40
>=260 3.10 3.50 3.90 4.30 4.70
Bureau of Energy Efficiency
Page 8
All the values shall be recorded to three significant figures. The ISEER and COP
shall be rounded off to two significant figures in accordance with IS 2 : 1960 ‘Rules
for rounding off numerical values (revised)’.
9 FEES
1. Company registration fees shall be Rs.1,00,000(One Lakh Only) which is
refundable.
2. Application fee payable on application for assignment of the authority to affix
label is INR 2000/ per model- (Rupees two thousand only).
3. Application fee payable on application for degradation/renewal of authority to
affix labels is INR 1000/ per model (Rupees one thousand only).
4. Labelling fee for affixation of label on each unit of chiller is INR 3/kW/-
(Rupees three per kilowatt of refrigeration only).
10 LABEL DESIGN AND MAN NER OF DISPLAY
Placement: The label shall be firmly fixed on chiller and near the nameplate of the
chiller.
Material, Dimension and Shape
The label shall be of durable material (aluminium anodized) and be printed as per
the size given below. The name plate of corrosion resistant material shall be affixed
on the chiller. The markings required by the schedule shall be legible, indelible and
durable.
11 CHECK TESTING
The chiller manufacturer shall submit the chiller production schedule and delivery
schedule about the chillers which are registered under star rating program, quarterly
in the BEE portal.
1. For check testing, BEE will depute their representative to witness check
testing in the presence of AHRI/EUROVENT/client. Physical testing to be
carried out on a chiller for each basic model group in factory/independent
lab(30% of total BMG’S will be tested each year, per manufacturer)
2. During check testing, if the chiller fails:
a) BEE will publish, for the benefit of the consumers, the name of the
permittee, brand name, model name or model number, logo and other
specific action in any national or regional daily newspaper and in any
electronic or in any l other manner as it deems fit within two months;
b) BEE will cancel the registration of the particular chiller model.
Bureau of Energy Efficiency
Page 9
c) intimate to the concerned State Designated Agencies to initiate further
adjudication proceedings against the permittee and the trader under section
27 of the Act.
3. Incase of non-compliance as per manufacturer’s declaration, the
manufacturer has to again submit a fresh application with derated
COP/ISEER for the respective the basic model groups.
12 SAMPLE LABEL:
Bureau of Energy Efficiency
Page 10
APPENDIX -A
The method to calculate India Seasonal Energy Efficiency Ratio (ISEER) can be
referred as per methodology laid out in Annexure B of ‘IS 16590: 2017 Water-cooled
Chilling Packages Using the Vapour Compression Cycle− Specification’
Purpose
The purpose of this appendix is to define a uniform procedure for the calculation of a
single value number that is a representation of the part load efficiency of a chiller. The
single value number will be called an India Seasonal Energy Efficiency Ratio or
ISEER. It is somewhat like highway and city fuel efficiency for cars, which both are
intended to be typical efficiency number, but will likely not exactly match actual
efficiencies obtained under actual operating conditions.
Scope
The procedure mentioned in this appendix is only for equipment covered by IS 16590:
2017. The ISEER equation and procedure are intended to be an average representation
of a single chiller in a typical commercial application with conventional operating
parameters. The procedure is intended to provide a consistent uniform method for
calculating the single number for part load operation. A fixed set of operating load
points and conditions are defined to allow for equal comparison of products. But
allowances have been made to allow for correlation to ambient and building
operational and construction standards. The intent is that this single value metric be
used by efficiency standards and certification programs that require more than a full
load efficiency level.
The equation has been derived to provide a representation of the average part load
efficiency for a single chiller only. However, for operating cost and energy analysis it
is best to use a comprehensive analysis tool that reflects the actual weather data,
building load characteristics, operational hours, economizer capabilities and energy
drawn by auxiliaries such as pumps and cooling towers when calculating the applied
chiller system efficiency. This becomes increasingly important with multiple chiller
systems because individual chillers operating within multiple chiller systems can have
significantly different load profiles than a single chiller.
Equation and Definition of Terms
The single value part load rating shall be determined by using the following equation;
ISEER = A x COP 100% + B x COP 75% + C x COP 50% + D x COP 25%
Bureau of Energy Efficiency
Page 11
where:
COP100% = COP at full load rating point and operating conditions
COP75% = COP at 75% load rating point and operating conditions
COP50% = COP at 50% load rating point and operating conditions
COP25% = COP at 25% load rating point and operating conditions
A= weighting factor for 100% load
B= weighting factor for 75% load
C= weighting factor for 50% load
D= weighting factor for 25% load
The values of A, B, C, and D are based on the weighted average of the most common
building types across climatic zones of India. Values that have been developed are
given in: in Table 6.
Table 6 Weighting coefficients A to D for calculation of ISEER
Load rate (%) 100 75 50 25
Weighting Co-efficient A=6 B=48 C=36 D=10
The ISEER rating requires that the unit efficiency be determined at 100%, 75%, 50%
and 25% at the conditions specified in Table 7.
Table 7 Indian Seasonal Energy Efficiency Rating Conditions
Liquid-cooled Air-cooled
Evaporator Liquid temperature
Leaving 7 °C
Flow Flow rate equal to a 5 °C Delta Temperature at 100% rating point
Evaporator fouling factor allowance
Water side 0.044 m
2
.°C /kW
Condenser fouling factor allowance
Water side 0.088 m
2
.°C/kW 0.000 m
2
.°C/kW
Condenser flow Flow rate equal to a 5 °C Δ T at
100% rating point
Airflow equal to the full
load rating
Bureau of Energy Efficiency
Page 12
Condenser Entering Temperature
100% Load
75% Load
50% Load
25% Load
30.0 °C
26.0 °C
23.0 °C
20.0 °C
39.0 °C
32.0 °C
26.0 °C
20.0 °C
For units with proportional unloading performance should be obtained at the 25%,
50%, 75% and 100% points to calculate the ISEER.
If the unit has discrete steps of unloading, but due to its capacity control logic cannot
be operated at 75%, 50% or 25% capacity, then the unit should be operated at other
load points and the 75%, 50%, or 25% capacity efficiencies should be determined by
interpolating between the two operating points that frame the rating point. The required
condenser entering temperature at the requested load point should be used and a
capacity test run at each unloading stage on either side of the desired part load rating
point then should be interpolated to obtain the desired part load point rating. For
example, if the unit has capacity stages at 33% and 66% nominal displacement, then
the 50% point can be determined by obtaining the capacity and efficiency at the 66%
unloading stage at 50% entering temperature and another test, at the 33% unloading
stage at the 50% entering temperature. Extrapolation of data shall not be used and the
desired rating point must be framed by two actual operating points. An actual chiller
capacity point, equal to or less than the required rating point must be used to plot the
data. For example, if the minimum actual capacity is 33%, then the curve can be used
to determine the 50% capacity point, but not the 25% capacity point.
If a unit cannot be unloaded to the 25%, 50%, or 75% capacity point, then the unit
should be run at the minimum step of unloading at the condenser entering temperature
based on Table 7 for 25%, 50% or 75% capacity points as required. The efficiency
shall then be determined by using the following equation:
����=
�������������
����
��
���������
����
Where,
�������������
���� and �������
����are the values from the lowest stage of unloading running
at the desired part load rating point.
��
�� is a degradation factor to account for cycling of the compressor for capacities less
than the minimum step of capacity. Cd should be calculated using the following
equation:
��
��=(−0.13×����)+1.13
The factor LF should be calculated using the following equation:
Bureau of Energy Efficiency
Page 13
����=
(
%������
100
)×(������� ������ ����� ������������)
������ ������ ����� ������������
Where:
Percent load = standard rating point at 75%, 50% and 25% of the full load.
Full load capacity is the capacity at the full load 100% rating point as defined in table
9 of IS 16590.
The part load capacity of the unit is the capacity obtained when the machine is run at
its lowest stage of capacity at the desired load point rating conditions.
For water cooled units where a unit has been selected for operating conditions that will
not allow operation at the full load condenser entering fluid conditions, then an ISEER
cannot be calculated. For these applications ISEER can be determined, using the same
procedures as defined above except that for the full load rating point the machine will
be run at the maximum design entering condenser temperature. The 75%, 50% and
25% points will then be run at the temperatures defined in Table 79 unless the unit will
not operate at these conditions and then the maximum option temperature shall be used.
For example, if a chiller was selected for 30°C full load condenser entering fluid
temperature then the 100% point would be determined at a 30°C entering conditions.
For ISEER rating the75% would then be determined at a 26 °C entering temperature,
the 50% at 23°C and the 25% point at 20°C.
APPENDIX-B
General Information
Manufacturer/Laboratory name
Address
Date of receipt
Laboratory Registration No.
Validity of the Test laboratory
Test report No.
Tested by
Date of testing
Reviewed by
Bureau of Energy Efficiency
Page 14
Details of the Chiller tested in addition to Table 6 of IS 16590
Brand name
Basic Model Group
Model 1, model 2, model3….
Serial number
Year of manufacture
Measured cooling capacity kW (at 25%
load)
Measured cooling capacity kW (at 50%
load)
Measured cooling capacity kW (at 75%
load)
Measured cooling capacity kW (at 100%
load)
Measured Power consumption at 25 %
load
Measured Power consumption at 50 %
load
Measured Power consumption at 75 %
load
Measured Power consumption at 100 %
load
COP-25%
COP-50%
COP-75%
COP-100%
ISEER
