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ppt absorption Refrigeration

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by

Wen Xiong Tan

on 12 May 2014

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Transcript of ppt absorption Refrigeration

Performance Testing of Absorption Refrigeration system
Startup Preparation and Installation
Challenges
Conclusion
Scope
Prepare the recently built absorption system for performance testing.
Carried out testing and installation of various component
Subsequently, acquire the operating data for research and analysis.

By: Tan Wen Xiong
U1121418L

System Description
Schematic
Motivation of Absorption refrigeration
Motivation of Absorption refrigeration
Background
Literature Review
Types of absorption refrigeration cycles
Working fluids used in the cycles
Coefficient of Performance
1st and 2nd law of Thermodynamics
Standards and rating
Introduction
Performance Testing
of
Absorption Refrigeration System
Supervisor: Associate Prof Cai Wenjian
Examiner: Associate Prof Mao Kezhi
Student: Tan Wen Xiong U1121418L
Air-condition played an important role in our life, especially in tropical countries.
Conventional air-conditioning system caused huge impacts to the environment.
Absorption refrigeration exploits the disadvantages by using recycle heat driven energy.
Recycle the heat produce back to absorption cycle rather than exhausting out to the environment.
Ferdinand Carre, demostrated ammonia and water absorption refrigeration in 1859.
The first patent for a commercial absorption system.
Throughout the past 100 over years, the absoprtion cycle has been extensively developed.
Popular alternative to replace the conventional compression refrigeration system.
Purpose and Objective
Purpose is to conduct a research study on the newly built absorption refrigeration system.

The objectives of the research study are:
To prepare the startup of the research study.
To understand the working principles.
To install and test specific components of the absorption refrigeration system.
Types of absorption cycles
Single Effect Absorption cycle
Double Effect Absorption Cycle
Triple/ Multi Effect Absorption cycle
Working fluids in Absorption cycles
Refrigerant and Absorbent
Guideline for choosing refrigerant
Refrigerant
Absorbent
Ozone and environmental friendly
Properties of low boiling temperature
Non Flammable and Non explosive
Non-toxic
Cost effective
Easily detectable in case of leakage
Why R-134a Refrigerant?
Widely use and available
Non-flammable and non-toxic
One of the safest for use refrigerant
Non-corrosive on standard steel and copper
To absorb the vaporised refrigerant in the cycle.
DMF
-Health and safety hazard
Ionic liquid (BMIM BF4)
-Ionic liquids are a molten salts composed of organic cation and inorganic anion
-Unique physical and chemical properties ( negligible vapour pressure, excellent solubility, large liquid temperature and phase range)
-Low impact to environment
Coefficient of performance (COP)
COP is mostly used to determine the efficiency and performance of absorption cycles and refrigeration system.
In general, it is expressed as:
QL = Amount of heat absorbed
Qin = Heat input to the refrigerator
Qout = Heat produce or heat output
Win = Qout - Qin
General COP
COP of an ideal absorption refrigeration system is:
System Components
Water heater
and pump
Generator
System Components
Condenser
Condense the hot vapour refrigerant to a liquid refrigerant
The vapour refrigerant is cooled and condensed on the tube surface
Evaporator
Heat up and evaporate the liquid refrigerant to vapour refrigerant
Operating at lower pressure
Vapour refrigerant can exit and travel to the absorber
System Component
System Component
Bubble Absorber
The "absorption process" is carried out.
Weak solution absorb the R134a vapour refrigerant
Produce strong solution
The strong solution flows to the S.S tank
Solution Heat Exchanger
Increase the heat transfer efficiency from one fluid to another fluid without allowing them to mix
Energy saving devices in the system
Recover the waste heat to heat up the strong solution
System Component
Leakage testing
Installation of Concentration Sensor
Installation of temperature sensors
Leakage testing
Ensure minimal leakage before running the system
Ensure accuracy and system reliability
Pressure up to 9 bar from the external tank through the regulator
Monitor for 24 hours
Found 0.1 bar pressure leak
In the tolerable and acceptable range
Installation of Concentration Sensor
Measure the online concentration values of the refrigerant-absorbent solution
Install before and after the absorption separation process
Comparing the differences in the concentration can analyze the performance of the separation absorption process
Specifically measure the refrigerant concentration at the input and output of the generator.
Specification of concentration sensor
Estimated cost of Concentration Sensor
Installation of Sensors and Wiring
Literature review
Introduction
System description
Startup preparation
Discussion
Conclusion
Installing the concentration sensor for a specific pair of working fluids.
Concentration sensor requires to be calibrated and manufacturer have no prevalent set of calibration data based on the novel ionic liquid.
Sensor needs to be modifier according to our system requirement. More than a COTS product.
Most sensor measures overall concentration rather than specific individual concentration.
Continuous effort was put in to prepare and setup the system in order to proceed for experiment testing.
Sensors and components of the project are tested and checked to ensure it is in working condition.
The experience and knowledge gained provides a great insight to air-conditioning systems
Future Work
Filling of working fluids (refrigerant and absorbent) to the system.
Performance testing and obtain operating data
Analyze the efficiency of the system based on the operating data
Installing component with different design and conduct a study on the performance and efficiency of various design with the same function.
Use a model predictive control to analyze the performance.
Q & A
Full transcript