DAIKIN TZ-B:
THE MOST EFFICIENT A/C SCREW CHILLER
IN THE MARKET
Applied Days
Rome, 6th of October 2016
Green Building Design
New Legislations
New Technologies
3
GREEN BUILDING DESIGN
4
GREEN BUILDING DESIGN & CERTIFICATION
DEFINITION
Assessment used to demonstrate the environmental credentials of a building.
SCOPE
For clients, planners, development agencies, funders and developers:
specify the sustainability performance of their building.
For property agents: promote the environmental credentials and
benefits of a building to potential purchasers and tenants.
Key factors driving HVAC Market
5
GREEN BUILDING DESIGN & CERTIFICATION
Score credits per BREEAM category*
Credits
%
Max. Credits:
*Based on BREEAM International
New Construction 2013
14
12
10
Levels of certification:
≥ 85% Outstanding
≥ 70% Excellent
≥ 55% Very good
≥ 45% Good
≥ 30% Pass
< 30% Unclassified
8
6
4
2
0
Key factors driving HVAC Market
6
Each category carries
a certain weight
that affects the score.
TYPICAL HVAC ENERGY CONSUMPTIONS
in OFFICES
Ventilation
Space cooling
Hot water
Space heating
Manage up to 48%
of your energy use
Source:
1. EIA Commercial Buildings Energy consumption survey ;
2. Energy conservation centre, 2009
Key factors driving HVAC Market
7
NEW LEGISLATIONS
8
TARGET BY 2050
-80% CO2 emissions
Key factors driving HVAC Market
9
Direct emissions
F-GAS
To cut the emissions of the F-gases
(=fluorinated gases) into the atmosphere.
Indirect emissions
ECODESIGN
Key factors driving HVAC Market
10
To set the minimum efficiency requirements
for HVAC systems.
NEW TECHNOLOGIES
11
New Technology
Continuous evolution in
components’ technology.
Advanced technologies
nowadays available at
competitive prices.
12
Green Building Design
Reduction of running costs and C02 emissions
Increasing demand for
New Legislations
EU – low carbon roadmap International protocols
New Technologies
Continuous evolution in components’ technology
Key factors driving HVAC Market
13
HIGH EFFICIENCY
HVAC SYSTEMS
OUR MISSION IN PRODUCT DEVELOPMENT
ANSWERING MARKET DEMANDS
OFFERING NEW OPPORTUNITIES
ANTICIPATING FUTURE NEEDS
14
DAIKIN “TZ-B”
The most efficient A/C screw
chiller in the market
15
DAIKIN TZ-B
 Full inverter air cooled chiller
 Capacity range from 170 up to 1100 kW
 Daikin single screw compressor with
integrated inverter and Variable Volume
Ratio
 Best efficiency @ full load and part load
DAIKIN TZ-B
dual circuit
single circuit
350 kW
Standard sound
Low sound
Platinum
-6 dB(A) vs standard
Gold
Silver
Silver
Efficiency
17
1100 kW
700 kW
Noise level
150 kW
Reduced sound
-8 dB(A) vs standard
DAIKIN TZ-B vs competition
6
DAIKIN TZ-B
Platinum
Part load efficiency (ESEER)*
5,5
DAIKIN TZ-B
Gold
DAIKIN TZ-B
Silver
5
4,5
Competitor 1
Competitor 2
Efficiency level
for Inverter
screw
market
4
Part load Efficiency level for non inverter screw
market
3,5
100
18
200
300
*Performance according to EN14511
400
500
600
700
Capacity [kW]
800
900
1000
1100
1200
2000
1500
1000
0
-500
-1000
DAIKIN TZ-B:
Full load efficiency (EER) @ Eurovent condition = 3,09
Part load efficiency (ESEER) =5,09
Best competitor inverter chiller:
Full load efficiency (EER) @ Eurovent condition = 3,23
Part load efficiency (ESEER) =4,67
Standard fix-speed chiller :
Full load efficiency (EER) @ Eurovent condition = 3,16
Part load efficiency (ESEER) =3,75
19
77
71
65
59
53
47
41
35
29
23
17
11
5
500
Ambient
temp [°C]
application: office building
location: Madrid
peak Cooling load:1790 KW
Running hours per year:
2000 h
Cost for electricity:
0,14 €/kW
Requested 3 chiller 600 KW
Load [kW]
COMFORT COOLING
DAIKIN TZ-B
Best
competitor
Inverter chiller
Standard
fix-speed chiller
running cost per
year
€ 23.018
€ 24.520
€ 27.087
Saving with
DAIKIN TZ-B on a life
cycle (15 years)
-
€ 22.530
€ 61.000
ROI with Daikin
TZ-B vs fix speed
-
-
~ 2,5 years
Daikin technical solution for
high efficiency
20
Daikin solutions for high efficiency
Latest generation of Daikin single screw compressors
Latest generation of Daikin single screw compressors
Single screw VS twin screw
Thanks to his characteristic geometry the single screw compressor is a better matching
with inverter application compared to the twin screw
22
Latest generation of Daikin single screw compressors
Single screw VS twin screw
Twin screw
casing
Refrigerant
leak
Low pressure
rotor
High pressure
The parabolic shapes lead to less
quantity oil between rotor and
stator, as a consequence is easier
for the refrigerant to flow back
from high pressure side to low
pressure side.
Single screw
Casing
Refrigerant
leak
Low pressure
23
rotor
High pressure
the single screw compressor is
characterized by smaller distance
between rotor and casing allowing
to a smaller amount of refrigerant
to flow back from high pressure to
low pressure side
Daikin solutions for high efficiency
Latest generation Daikin design inverter screw compressors
+
Daikin’s unique single screw design
for perfectly balanced loads combined
with inverter technology
Benefits of Inverter: Top Class Efficiency
Compressor
load
Traditional mechanical
Unloading with sliding valves
Daikin unloading
with inverter technology
100% load
100%
speed
100%
speed
50% load
100%
speed +
50%
speed
mechanical
unloading
25% load
100%
speed +
mechanical
unloading
25%
speed
Power Input
Benefits of Inverter: Top Class Efficiency
100
Screw Compressor
With mechanical unloading
90
80
73%
70
-23%
60
Screw Compressor INVERTER driven
50%
50
Power consumption significantly
reduced at part loads where
the machine will run for
97% of operating hours (Eurovent).
40
30
20
10
0
0
10
20
30
40
50%
50
60
70
80
90
100
Compressor Load
Other benefits of Inverter
Reduced mechanical stress
No inrush current
27
High power factor
Lower noise level at part loads
Daikin solutions for high efficiency
Latest generation Daikin design inverter screw compressors with Variable
Volume Ratio technology
+
+ VVR
Daikin’s unique single screw design
for perfectly balanced loads combined
with inverter technology
And VVR (Variable Volume Ratio)
Variable Volume Ratio
The Volume Ratio (VR) is defined as follow
Volume of gas at inlet suction of compressor
Volume of gas at exit discharge of compressor
and is linked to the Pressure Ratio
VRk =
Pressure of gas at exit discharge of compressor
Pressure of gas at inlet suction of compressor
(k is constant and depend from the refrigerant)
The higher the Volume Ratio (VR), the higher the
pressure of the gas at discharge
The lower the Volume Ratio (VR), the lower the pressure
of the gas at discharge
29
Variable Volume Ratio
𝑷𝑫𝒊𝒔𝒄𝒉𝒂𝒓𝒈𝒆 > 𝑷𝑪𝒐𝒏𝒅𝒆𝒏𝒔𝒊𝒏𝒈
Refrigerant is compressed more
than needed to move it to condenser
Over compression
Efficiency loss
30
CONDENSER
Variable Volume Ratio
CONDENSER
𝑷𝑫𝒊𝒔𝒄𝒉𝒂𝒓𝒈𝒆 < 𝑷𝑪𝒐𝒏𝒅𝒆𝒏𝒔𝒊𝒏𝒈
Refrigerant flows back from
condenser to compressor
Under compression
Efficiency loss
31
Variable Volume Ratio
Variable Volume Ratio (VVR) means
that VR can change by moving of sliding
valves. VVR changes the point at which the
gas leaves the compressor, and therefore
changes the pressures at discharge which is
always optimal at any condition.
CONDENSER
P
B
Pd = Pc
DAIKIN VVR
ALWAYS OPTIMAL CONDITIONS
Variable
POINT A
A
POINT B
Ps
V
Vd
Variable
Vs
Daikin solutions for high efficiency
Latest generation Daikin design inverter screw compressors with Variable
Volume Ratio technology
+
+ VVR
High efficiency
EC fans
DAIKIN TZ-B technology
Last generation of
Microchannel condensing coils
Evolved control logic
DC motor for compressors
Economizer
circuit controlled
by electronic
expansion valve
34
DAIKIN TZ-B
Application flexibility
COMFORT COOLING
RENTAL
Low Temperature
application
Data Center
PROCESS COOLING
HIGH AMBIENT
Temperature
35
DAIKIN TZ-B
Application flexibility
COMFORT COOLING
Low Temperature
application
RENTAL
PROCESS COOLING
HIGH AMBIENT
Temperature
Data Center
36
all applications
needs
high part load
efficiency
most common wrong believes
We don’t need inverter units for process cooling
due to the constant load
In multiple chiller plant is better to shut down some
units instead of running all of them in part load
Inverter driven compressors are not suitable for
applications in hot and/or dusty environment
(e.g. industrial, rural, desert environment)
37
1) We don’t need inverter units for process cooling due to the constant load
Load [kW]
Process application (e.g. data center, cooling of industrial machinery) are characterized by constant loads
during the year.
In order to ensure that the load request is always satisfied, the chiller is designed to give the proper cooling
capacity in the worst operating condition for the specific climate region
@ design condition:
Ambient: 35°C
Required
load
38
Chiller
100%
capacity
1) We don’t need inverter units for process cooling due to the constant load
While the load request is constant during the year the ambient temperature is not. The unit is selected to give the needed
capacity at design condition, but for the most of the time will operate at different (more favorable) conditions, leading to
different performances from the design (worst case).
For most of the time the chiller is running in unload conditions !!
chiller unloading80
Unit capacity in
% of required
load
130 %
70
120 %
60
110 %
50
40
100
30
20
80
10
0
70
39
jan
feb
march
apr
may
june
jul
aug
sept
oct
nov
dec
Ambient
temp. [°C]
required load
(always 100%)
90
DAIKIN TZ-B:
Full load efficiency (EER) @ Eurovent condition = 3,2
Part load efficiency (ESEER) =5,12
Non inverter chiller solution:
Full load efficiency (EER) @ Eurovent condition = 3,21
Part load efficiency (ESEER) =3,77
40
42
500
500
37
400
32
Ambient
temp [°C]
application: cooling of industrial machinery
location: Milan
Cooling load: 500 kW
Running hours per year:
8760 h
Cost for electricity:
0,15 €/kW
Load [kW]
PROCESS COOLING
27
35
22
30
17
25
12
20
157
102
5
300
200
100
0
running cost per
year
ROI
Daikin TZ-B
Non inverter
solution
€ 137.000
€ 145.000
1 year
Saving on chiller life time (15 years): € 120.000
2) In multiple chiller plant is better to shut down some units instead of running all of
them in part load
Typically in case of multiple chiller installation is considered a better solution to have more chiller that run at
full load and stage the plant shutting down the chillers (and the related pumps) as the load decrease
Plant load 66%
Plant load 100%
Plant load 33%
Unit load
Unit load
Unit load
Unit load
Unit load
Unit load
Unit load
Unit load
Unit load
100%
100%
100%
100%
100%
0%
100%
0%
0%
41
2) In multiple chiller plant is better to shut down some units instead of running all of
them in part load
Thanks to the high efficiency in part load operation with inverter chiller can be more efficient to run all the
chillers in part load (even considering “fix-speed” pumps on primary circuits)
Plant load 66%
Plant load 100%
Plant load 33%
Unit load
Unit load
Unit load
Unit load
Unit load
Unit load
Unit load
Unit load
Unit load
100%
100%
100%
66%
66%
66%
33%
33%
33%
In case of variable speed pumps on primary circuits or in primary only plant with variable speed pumps, the
benefits of the inverter chiller solution is even higher
42
COMFORT COOLING
(design at 46°C ambient temperature)
Running hours per year:
8760 h
Cost for electricity:
0,11 €/kW
600
hours
application: Hotel
location: Dubai
Cooling load: 2 MW
Load [%]
500
100
400
80
300
60
200
40
100
20
0
0
16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
Note: Fix speed pump on Primary plant
Solution 1:
3 x Non inverter chiller
Full load efficiency (EER) @ 46°C ambient = 2,42
Part load efficiency (ESEER) = 3,77
Solution 2:
3 x Daikin TZ-B
Full load efficiency (EER) @ 46°C ambient = 2,34
Part load efficiency (ESEER) = 4,57
43
120
Ambient temperature [°C]
running cost per
year
ROI
DAIKIN TZ-B
Non inverter
solution
€ 201.780
€ 226.000
~ 1 year
Saving on chiller life time (15 years): € 363.300
3) Inverter driven compressors are not suitable for applications in dusty environment
(e.g. industrial, rural, desert environment)
Daikin solution provides a refrigerant cooled inverter integrated on the compressor.
The temperature of the inverter is kept within the acceptable limits regardless the environmental conditions
the traditional solution with
Air- cooled inverter
44
DAIKIN solution with integrated
Refrigerant cooled inverter
thanks to the most advanced
technology and highest part
load efficiency….
45
DAIKIN TZ-B is always
the best choice
THANK YOU
46