Performance Investigation of
Carbon Dioxide Vapor
Compression Refrigeration
Systems in Warm Climates
111116064- Rahul Bhaval Das
111116068- Reon John
111116038-Kavya Venkatesan
Project Guide: Prof. SS Harish Kruthiventi
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Booster CO2 Refrigeration Cycle Simulation using ASPEN Plus, Thesis of Refrigeration and Air Conditioning
The simulation of different configurations of booster cycle is done in ASPEN Plus and compared.
Typology: Thesis
2019/2020
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Performance Investigation of
Carbon Dioxide Vapor
Compression Refrigeration
Systems in Warm Climates
111116064- Rahul Bhaval Das 111116068- Reon John 111116038-Kavya Venkatesan Project Guide: Prof. SS Harish Kruthiventi
INTRODUCTION
- With the increasing demand for environment-friendly alternatives, refrigerants have shifted over the last 50 years from CFCs to HFCs and now are moving towards natural refrigerants such as carbon dioxide due to their lower GWP (Global Warming Potential) and ODP (Ozone Depletion Potential).
- (^) Refrigeration systems contribute largely to global warming through direct (refrigerant leakage) and indirect (energy demand met through fossil fuels) emissions. With projected increase in demand for refrigeration in India, the need to move towards cleaner refrigeration infrastructure will be essential.
- System leaks and improper recovery of refrigerants during repairs or at end of life result in these harmful gases entering the atmosphere. Furthermore, during production of refrigerants, toxic and harmful wastes are released into the environment, which cause air, water and land pollution in addition to releasing greenhouse gases.
OBJECTIVES:-
- (^) To identify the optimal configurations for the CO2 based refrigeration systems with
maximum COP suitable for warm ambient temperatures experienced in India.
- To study the effect of receiver pressure on the performance of the trans-critical booster
refrigeration systems.
- To investigate the possible usage of waste heat rejected from the gas cooler.
Booster Cycle Simulation
Assumptions
- No heat loss at the liquid receiver.
- (^) Adiabatic compression
- (^) Constant pressure heat exchange devices at evaporators and gas cooler.
- (^) No pressure loss due to flow.
- (^) Isenthalpic expansion at the valves
Simulation Parameters
(^) Ambient Temperature โ 38 C
(^) Approach temperature () โ 5 C
MT Cooling at -10 C with load 60 kW
(^) LT Cooling at -35 C with load 20kW
(^) Receiver Pressure โ 35 bar
COP โ 0.
Booster Cycle with Parallel Compressor
Simulation
COP โ 0.
Booster Cycle with Parallel Compressor and
Expander
Simulation
COP โ 1.
Effect of Variation of Receiver Pressure
Gas Cooler Waste Heat Utilization
- (^) There is a large amount of heat that is rejected at the gas cooler that can be utilized to generate power for other systems such as air conditioners, lights etc. which are also required in the supermarket environments.
- (^) This is achieved using an IC engine โ generator combination.
- (^) The IC engine takes the heat rejected at the gas cooler to generate mechanical energy which is then utilized by the generator to produce electrical energy.
- The Carnot efficiency calculation is shown