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ET 915.07

- Complete model of a full air conditioning system
- Heating, cooling, humidifying and dehumidifying
- Outer air and recirculation operation possible
- Component operation and fault simulation via the GUNT software


Technical Description

ET 915.07 is part of the HSI training system for refrigeration and air conditioning technology. In combination with the base unit ET 915 the operational model of a full air conditioning system is created. The model is plugged onto the base unit, secured using fasteners and connected with refrigerant hoses to become a complete refrigeration circuit for the air cooler. 

The room climate is created by the interaction of air temperature, heating temperature and air humidity. The purpose of room air conditioning is to shape the room climate in accordance with the requirements of people or sensitive goods. This model introduces the operation of an air conditioning system and the recirculating air and outer air operating modes. 

The model ET 915.07 includes two air ducts with transparent front. The top air duct serves as climatic chamber whilst the bottom air duct contains the air cooler, two electric air heaters and a steam humidifier. A fan between the two air ducts recirculates the air. A motorised butterfly valve in the top air duct allows a change between outer air and recirculating operation. Dependent on the switching of the two air heaters, the air cooler and the humidifier, the air in the duct system can be cooled, heated, humidified or dehumidified.

The individual system components are operated via the GUNT software. Temperature and humidity before and after the evaporator and in the climatic chamber are recorded by sensors, digitised and represented dynamically in the software. The conditioning of the air can be monitored online in the h-x diagram.

Fundamentals and individual components are represented in the educational software for ET 915.07. Performance assessments check the learning progress. With the aid of the authoring system further exercises and performance assessments can be created.

Learning Objectives / Experiments

- full air conditioning system and its main components
- heating and cooling in the h-x diagram
- humidifying and dehumidifying in the h-x diagram
- outer air and recirculating operation
- fault simulation



[1] model of an air conditioning system to plug onto the base unit ET 915
[2] GUNT training system with HSI technology
[3] air duct with transparent front and adjustable ventilation flap for recirculating or outer air operation
[4] evaporator as air cooler
[5] 2 heaters as air preheater and reheater
[6] air humidifier with float switch, fan, filling level indication
[7] thermostatic expansion valve as expansion element
[8] sensor to record temperature and combined sensor for humidity and temperature
[9] operation of individual components and of the system and fault simulation via software
[10] GUNT software: educational software, data acquisition, system operation 
[11] GUNT software for data acquisition via USB under Windows Vista or Windows 7

Technical Data
Air duct, top: 136x136x800mm 
Evaporator as air cooler
- transfer area: approx. 900cm²
Air heater: 2x 250W
Axial fan
- max. power consumption: 20W
- max. flow rate: 160m³/h
- heater: 200W
Servomotor for ventilation flap: 24VDC
Measuring ranges
- temperature: 2x -50...50°C, 5x 0...50°C
- humidity: 4x 10...100% r.h.

Dimensions and Weight

LxWxH: 850x400x680mm
Weight: approx. 51kg

Scope of Delivery

1 air conditioning system model, filled with refrigerant

1 narrow mouth bottle

1 GUNT software CD + USB cable

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