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 Products:  Thermodynamics, Heating and Sanitary Systems » Refrigeration and Air Conditioning » Particular Units » ET 103
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ET 103: Heat Pump with Pumpdown Control

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Heat Pump with Pumpdown Control

Heat Pump with Pumpdown Control

Product Details

Technical Description
This benchtop unit comprises components that are used in industrial heat pumps. All relevant measured values are displayed. The energy supplied to the compressor motor can be read on a kWh meter. A "pumpdown" circuit is included in the system. After the evaporator outlet temperature is reached a solenoid valve closes the inlet side to the expansion valve. The compressor continues to run and fill the collector with refrigerant until the high pressure cut-out activates. An environmentally friendly refrigerant is used.
A supply of cooling water is required.

Learning Objectives / Experiments
- Familiarisation with the function and main components of a heat pump
- Operating in "pumpdown" mode (compressor control)
- Cyclic process on the p-h state diagram
- Calculation of the heat transfer rate at heat exchangers

* Air-to-water heat pump
* Compact system with all components from refrigeration engineering
* "Pumpdown" mode
[1] Air-to-water heat pump as benchtop unit
[2] Pumpdown circuit
[3] Water-cooled condensing unit with hermetic compressor and double tube condenser
[4] Power consumption of compressor determined by a kWh meter
[5] Air-cooled evaporator
[6] High/low pressure shut down (pressostats)
[7] Sight glass with humidity indicator, filter/ drier, thermostatic expansion valve
[8] Drip tray for condensate
[9] Non-polluting refrigerant R134a
[10] l x w x h: 1100x640x766mm, 30kg
[11] 230V, 50Hz, 1 phase

Technical Data
Condensing unit: power consumption: 489W, refrigerating capacity: 1413W at 15°C evaporation temperature
Evaporator, air-cooled: 1kW, surface: 1.5m², max. air flow rate: 290m³/h
Measuring ranges:
- pressure: -1...9bar / -1...24bar
- flow rate (water): 4...51g/s
- flow rate (refrigerant): 1.2...20g/s
- temperature: -20...200°C

Dimensions and Weight
l x w x h : 1100 x 640 x 766 mm
Weight : approx. 30 kg

230V, 50Hz, 1 phase
Cooling water connection

Scope of Delivery
1 complete unit, 1 instruction manual

Order Details
061.10300 ET 103 Heat Pump with Pumpdown Control
Alternative products
ET 104 -- Heat Pump with Dual Mode Evaporator
ET 405 -- Reverse Cycle Refrigeration Training System
ET 419 -- Heat Transfer in a Refrigeration System

SELKA GmbH, Hamburg
Grindelallee 188, 20144 Hamburg / Germany
Tel.: + 49 (0) 40 343453 |  Fax: +49 (0) 40 63657075
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