constant temp bath pdf
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DEVELOPMENT OF A CONSTANT TEMPERATUREBATH USING PHASE CHANGE MATERIALS FOR LOW
TEMPERATURE APPLICATIONS
B. SRIRAM (31509114050) III MECH
K. VINOTH KUMAR (31509114058) III MECH
N. ARUNACHALAM (31509114005) III MECH
A. PADMANATHAN (31509114304) III MECH
SUPERVISOR: Dr. N. LAKSHMI NARASIMHAN
ASSOCIATE PROFESSOR
MECHANICAL DEPARTMENT
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PROBLEM DEFINITION
A constant temperature bath employing a thermal energy
storage material and operating between 0 to 50C is to be built
and tested. Comparison on the performance between the
systems with and without a thermal storage material shall be
carried out experimentally.
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MOTIVATION
Chillers for Diffusion Vacuum Pumps have been fabricated
and deployed successfully at our Crystal Growth Centre by our
senior students.
There exists a scope for modifying the design of chillers to
function as a Constant Temperature Bath.
Integration of a Thermal Storage Device to such Constant
Temperature Baths is a novel idea and studies are needed tounderstand the system performance in real situations.
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OBJECTIVES
To design and build a unit that can maintain temperatures in
the range 0 to 50 C for 20 lit water capacity.
To design and integrate a thermal storage device with the
.
To test the performance of the unit with and without a
thermal storage system.
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PROPOSED DESIGN
Temperature of Bath = 0 to 50C
Tank Capacity = 20 litres
Mwater = 20 kgQLoad for 0 to 30C = 2500 Watts (estimated)
QChiller = 1 TR (selected)
QHeater for 30 to 50C = 1 kW (selected)Tank Dimensions (Inner Dimensions) = 303025 cm3
Identified PCM - HS7N (-7 to -5C) or
Frost (-1 to +1C)Identified Supplier - Pluss Polymers Ltd., Noida
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SCHEMATIC OF THE PROPOSED UNIT
WITHOUT PCM
Refrigeration unit
Heater unit
PID controller
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Temperature sensor(Pt 100)
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PROPESED UNIT WITH PCM
PCM
Refrigeration unit
Heater unit
7
PID controller
Temperature sensor
(Pt 100)
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SPECIAL FEATURES
Our system is Cost Effective when compared to the market
availability.
Energy conservation can be made by employing PCM.
By going for mass production, the cost can be reduced to a
considerable extent.
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TIME SCHEDULE OF ACTIVITIES
Activity Period MilestoneLiterature
Survey on
PCMs
0-1 months
Design of heat
exchanger and
PCM
1-2 months Fixing the size of the
unit and capacity
Procurement of
materials
3 months Preparation of quotes,
procurement
Fabrication of 3 months Construction of the
ready for testingExperimentation 3 months Testing the actual
performance of the
unit.
Documentation 1 month Preparing the final
report.
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TOTAL TIME : 12 MONTHS
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TIME SCHEDULE OF ACTIVITIES (Bar Chart)
Fabrication
Experimentation
Documentation
s
0 2 4 6 8 10 12
Literature survey
Design of Heat
Exchanger
Procurement of
MaterialsEve
nt
Months10
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BUDGET ESTIMATION
(i) NON CONSUMABLES
S. No Items ApproximateCost (Rs.)
1. Compressor 6000/-
2. Condenser 1200/-3. Heat Exchanger 4000/-
4. Evaporator Vessel 1300/-
5. Heater 1500/-
6. PID 3000/-
7. RTD 1000/-8. Temperature Indicator 5000/-
9. Refrigerant Gas 3000/-
10. PCM 2000/-
11. Insulation 1500/-
12. Pressure Gauges 1000/-13. Thermocouple 1500/-
Total (A) 32000/-
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Budget Estimation (Contd)
(ii) CONSUMABLES
S. No Items Approximate Cost(Rs)
1. Copper and Silver Brazing Rods 1000/-
2. Adhesives 500/-
3. Thermal Paste 500/-4. Miscellaneous 1000/-
Total (B) 3000/-
TOTAL BUDGET ESTIMATE (A+B+C) : Rs.41,000/-
S. No Items Approximate Cost(Rs)
1. Fabrication and labour charges 6000/-
Total (C) 6000/-
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EXPECTED OUTCOME
Development of a cost effective low temperature bath.
Understanding the actual performance of the bath with a
Latent Heat Storage.
A Publication in National/International level.
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THANK YOU