Ice Stores In Refrigeration
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Product Description
ICE STORES IN REFRIGERATION
Ice stores are used in refrigeration to cover an increased additional cooling requirement (peak load). The ice stores are usually charged over night when general energy requirements and energy costs are low.
To charge and discharge the ice store a circuit with glycolwater mixture is used between the ice store and the compression refrigeration system. When charging the ice store the glycol-water mixture is cooled via a compression refrigeration system to below 0°C and thereby withdraws heat from the water in the ice store, causing the water to freeze. During discharging the melting ice withdraws heat from the glycol-water mixture causing the mixture to cool down. During this cooling process the ice store replaces or supports the compression refrigeration system. consists of an ice store, a refrigeration system, a circuit with glycol-water mixture, a dry and a wet cooling tower. During the evaporation of the refrigerant in the refrigeration circuit and during discharging of the ice store, heat is withdrawn from the mixture, whereas during the condensing of the refrigerant heat is added. As required the cooling towers add heat to or withdraw heat from the mixture.
The record of all required variables enables an energy balance for the individual processes. The measured values are read from digital displays and can be transmitted simultaneously via USB directly to a PC where they can be analysed using the software included.
The unit shall perform the following experiments and investigations:
Learning Objectives / Experiments
- Design and operation of an energy-efficient
- Refrigeration system
- Function and operation of an ice store
- Charge
- Discharge
- Energy flow balance
- Energy transport via different media
- Compression refrigeration cycle in the log p-h
- Diagram
- Function and operation of a wet cooling tower
- Function and operation of a dry cooling tower
Specification
- Investigation of the charging and discharging of an ice store
- System with ice store, compression refrigeration system, dry and wet cooling towers
- Refrigeration circuit for R134a with compressor, condenser, evaporator and expansion valve
- Glycol-water circuits with pumps: cooling of the refrigerant condenser, heating of the refrigerant evaporator, charging/discharging of the ice store, operation of the dry cooling tower
- Water circuit with pump to operate the wet cooling tower
- Measurement of all relevant temperatures, pressures, flow rates and power consumption to balance the processes
- Software for data acquisition via USB under Windows Vista or Windows 7
Technical Data
- Compressor, refrigeration capacity: approx. 1,7kW
- At -15/32°C
- Pumps (glycol-water micture)
- Max. flow rate: 4,5m³/h
- Max. head: 5,6m
- Pump wet cooling tower (water)
- Max. flow rate: 4,5m³/h
- Max. head: 18m
- Ice store: 150L
- Compensation tank: 20L
- Wet cooling tower, rated cooling capacity: 12kW
- Dry cooling tower, rated cooling capacity: 13,8kW
Measuring ranges
- Temperature: 12x -20...100°C, 4x -50...150°C,
- 4x 0...60°C
- Pressure: 1x -1...9bar; 1x -1...24bar
- Flow rate: 3x 100...1200L/h, 2x 60...1500L/h,
- 1x 150...1600L/h, 1x 10...100L/h (R134a)
Dimensions and Weight
- LxWxH: approx. 2200x790x1900mm (trainer)
- LxWxH: approx. 1250x790x1700mm (wet cool. tower)
- LxWxH: approx. 1600x900x1140mm (dry cool. tower)
- Weight: approx. 650kg (in total)
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