EG5B Geothermal (low enthalpy) Energy Unit

5.3.5.- GEOTHERMAL ENERGY

INNOVATIVE SYSTEMS

The Geothermal (low enthalpy) Energy Unit, "EG5B", designed by EDIBON, consists of a cooling circuit, a small tank with pipes covered with water (bath) and a chilling unit (heat pump).

See general description

Catalog

Tender Specifications

Expansions

ICAI

Interactive Computer Aided Instruction Software

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General Description

The Geothermal (low enthalpy) Energy Unit, "EG5B", designed by EDIBON, consists of a cooling circuit, a small tank with pipes covered with water (bath) and a chilling unit (heat pump). The inside of the earth is simulated with them. There is another tank where the sanitary hot water heated by the unit is stored.

The cooling circuit consists of a compressor, an air condenser/evaporator, and two water condensers/evaporators. The reason is that the unit has a 4 ways valve that can detect if it is summer or winter by the environmental conditions. According to this, it sends the refrigerant gas to one or another exchanger. So they are able to work as evaporators or condensers of the refrigerant liquid.

The ground is simulated by means of a small tank that covers some pipes and a heat pump. The water of the tank is at a constant temperature, the same temperature that the earth has at 20 m of depth (15ºC [59ºF] approximately). This water goes to a bath, heating or cooling the water that flows through the pipes immersed in the bath.

Finally, there is a tank to store the water heated by the unit. It simulates the sanitary hot water of a house.

The unit has a cycle inversion valve, which is able to simulate winter and summer conditions, as it was mentioned before. Since the temperature of the earth at 20 m of depth is always 15ºC, this temperature will be higher than the environmental temperature in winter, therefore, the ground is used to heat (heating mode use). However, the environmental temperature in summer will be higher than 15ºC, so the ground’s water will be used to cool (refrigerating mode).

Exercises and guided practices

GUIDED PRACTICAL EXERCISES INCLUDED IN THE MANUAL

Study of geothermal energy using a geothermal heat pump system for heating and/or cooling.
Study of the system with different ground temperatures.
Determination of the inlet power, produced heat and coefficient of performance, working in heating mode. Water-water heat pump.
Determination of the inlet power, produced heat and coefficient of performance, working in cooling mode. Water-water heat pump.
Determination of the inlet power and valuation of the air temperatures, working in heating mode. Water-air heat pump.
Determination of the inlet power and valuation of the air temperature, working in cooling mode. Water-air heat pump.
Preparation of performance curves of the heat pump, working in heating mode, with different inlet and outlet temperatures. Water-water heat pump.
Preparation of performance curves of the heat pump, working in cooling mode, with different inlet and outlet temperatures. Water-water heat pump.
Lay out of the steam compression cycle in a P-H diagram and comparison with the ideal cycle. Water-water heat pump. Heating mode.
Lay out of the steam compression cycle in a P-H diagram and comparison with the ideal cycle. Water-air heat pump. Heating mode.
Preparation of the performance curves of the heat pump based on the properties of the refrigerant and at different condensation and evaporation temperatures. Water-water heat pump. Heating mode.
Preparation of the performance curves of the heat pump based on the properties of the refrigerant and at different condensation and evaporation temperatures. Water-water heat pump. Cooling mode.
Sensors calibration.

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