Introduction
CoolPack simulation software can be used to solve simple to complex refrigeration cycles for academic, research, and technical purposes. Due to its minimal hardware requirement, CoolPack is able to provide results for the problems within a fraction of a second.
Important !
High school students and undergraduates are highly advised to carry out manual calculations to solve the problems. Most of the simulation programs found on the internet are somewhat erroneous, and someone with less experience is very unlikely to determine such flaws.
Example 01 – Single stage flooded system
A 75 kW flooded chiller using R134a refrigerant operates between saturation temperatures of -15 °C in the evaporator and 35 °C in the condenser, with 2 °C subcooling. Assuming negligible piping losses and 80% compressor efficiency, estimate compressor input power at full load for single stage system.
1. Firstly, a schematic diagram like follows may be drawn to make visualization easy.
2. Make assumptions
- No heat loss from any of the components
- No pipe losses and pressure drops
- No superheating at the evaporator exit (flooded)
3. Model the particular system inside CoolPack interface
- Open the main interface of the software
- Select ‘Cool Tools – Cycle Analysis” from the left pane
- Select the appropriate refrigeration cycle. In this case: one stage cycle with flooded evaporator
- Refer to the schematic diagram and enter the relevant parameters accordingly as shown in below figure.
- Enter zero (=0) for null values such as superheat. Make volumetric efficiency zero (=0), and water temperature increase zero (=0) in Auxiliary tab.
- Click on the Calculate tab after entering the input data.