ajeep_04a_energy_eficient_chiller - Mitsu.pdf

1. © 2012 MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved.
Energy Efficient Chiller
And
Application

2. MHI Centrifugal Chiller Product Range

3. Chiller Component Features

4. New Frontier In Compression Technology
Lift

5. Two Stage Centrifugal Compressor
Two compression
processes take
place
simultaneously.
Double Lift effect
in enthalpy chart
enhancing energy
usages .

6. Chiller Compressor’ “Lift”
Double Impellers
Double impeller produces
higher “Lift” for the same
amount of energy used.
Lift

7. Centrifugal Chiller Cycle
Sub cool cycle
High performance
condenser
High
performance
Evaporator
High Efficiency
Two-stage Compressor
Two-stage
Compression
and Two-stage
expansion cycle
High Efficiency Two-stage cycle with Economizer and Sub-cooler
Environmental Friendly
Refrigerant HFC134a
Condensator
Sub-cooler
Condenser Evaporator
Economizer
Motor
Evaporator
Single Stage
Compressor
cooling water inlet
cooling water outlet
chilled water inlet
chilled water outlet
cooling water inlet
cooling water outlet
chilled water inlet
chilled water outlet
Motor

8. Sub-Cooler
Sub Cooler – The lower portion of the chillers condenser that further cools
the saturated liquid refrigerant.
Sub Cooler under chiller
condenser
Economizer
Compressor
Sub Cooler
Sub Cooler is plate heat exchanger

9. Economizer
In this case the refrigerant goes through two expansion devices. When the
refrigerant goes through the first device, some of the refrigerant flashes, or
becomes a gas. The flashed refrigerant is introduced to the compressor
between the two stages. It has the effect of “cooling” the superheated
refrigerant gas exiting the first stage.
Economizer

10. COP Comparison of Refrigerant Cycle
Single Stage
Two-stage
with Economizer
Single Stage
with Sub - cooler
Two-stage with
Economizer and Sub - cooler
Two-stage compressor
Motor
Condenser
Single stage compressor
Evaporator Condenser
Single stage compressor
Evaporator Condenser
Economizer
Two-stage compressor
Condenser
Economizer
Sub - cooler
Sub - cooler
Motor Motor Motor
Pressure
P
Condensation
Expansion
Evaporator
Compression
Enthalpy h
Pressure
P
Condensation
Expansion
Compression
Pressure
P
Pressure
P
Economizer
Economizer
Compression
Compression
Expansion
Expansion
Compression
Compression
Expansion
Expansion
Condensation Condensation
Sub - cool
Sub - cool
P-h
Diagram
System
Theore-
tical
COP
Cycle
Evaporator Evaporator
Evaporator Evaporator Evaporator
Enthalpy h Enthalpy h Enthalpy h
(note) Evaporating temperature : 4.2℃, Condensing temperature : 37.7℃, Sub - cool temperature : 4.0℃
7.30 (100) 7.59 (104) 7.89 (108) 8.05 (110)

11. Durability And Robustness Design
Hermetic Motor
Increasing Gear
First stage Impeller
Inlet guide vane
Diffuser vane
Second stage Impeller
Two stage Centrifugal
Compressor
Self Aligned High Speed and Low Speed Gear set.

12. Durability And Robustness Design
Combined Angular
Ball Bearing
Loss minimization at
bearing
Durability design
Endurance Test enhanced
validity of design
50,000hour without overhaul

13. Enhanced Tubing Heat Exchanger
High Performance Tubing for both Evaporator and Condenser
Eliminate laminar flow effect, by creating turbulence flow
inside and outside of heat exchange tubing.
Increase contact surface area (infinity).
Condenser –
Needle Fine Tube
Evaporator –
Internal & External Cut

14. Mitsubishi ETI Series
Variable Speed Drive Centrifugal Chiller
Cooling Capacity Range From 150RT to 700RT
Introducing HVAC Industries Innovative ……..
Double Impeller with Built-In Inverter Starter
Variable Speed Green Water Cooled Centrifugal
Chiller

15. Mitsubishi AART Series
Constant Speed Centrifugal Chiller
Cooling Capacity Range From 230RT to 5000RT
Double Impeller Constant Speed Green Water
Cooled Centrifugal Chiller

16. Mitsubishi AART-I
Series Variable Speed Centrifugal Chiller
Double Impeller with Built In Inverter Starter
Variable Speed Green Water Cooled Centrifugal
Chiller
Cooling Capacity Range From 230RT to
4000RT
4,000 RT

17. Mitsubishi AART-H Series
Ice & Heat Recovery Centrifugal Chiller
Ice Capacity Range From 190RT to 2100RT
Heat Recovery Range From 270RT to 1550RT
Double Impeller Constant Speed Green Water
Cooled Centrifugal Ice or Heat Recovery Chiller

18. Mitsubishi AART-H Custom Made Centrifugal Chiller
3 Compressors Single
Cooler Ice Chiller
3 Compressors Duel Coolers Ice Chiller