Abstract
The objective of this work is to analyze a gas injection borehole heat exchanger coupled with a desiccant assisted air conditioning system during cooling and heating operation. A common problem that occurs in air conditioning systems is peak loads, during which the cooling or heating power of the soil can be exceeded. To counteract this drawback, a gas injection borehole heat exchanger, which is capable of creating artificial groundwater flow along the heat exchanger by inducing a pressure difference inside the well, is used. Experimental results of the performance differences between a conventional and a gas injection borehole heat exchanger are presented. Under the same inlet conditions, a reduction in the outlet temperature of up to 2 °C is achieved compared with an equivalent conventional borehole heat exchanger in cooling mode. The maximum cooling power is increased by 26%. As a result, a fast and dynamic responding control of the heat transfer between the heat exchanger and the soil is possible. During winter operation, despite the lower drilling depth of the gas injection borehole heat exchanger system, the performance is within the range of a conventional system. The power increase is limited to around 0.2 kWth at a steady state. In conclusion, gas injection borehole heat exchangers can be promising in terms of reliable peak load handling within large geothermal fields.
Highlights
Global warming, in combination with the growing demand for thermal comfort in buildings, will result in increased sales numbers and energy demands of air conditioning systems
A desiccant assisted air conditioning system using a gas injection geothermal heat exchanger (GI-borehole heat exchangers (BHXs)) to cover cooling or heating peak loads is investigated in this study
Experimental results presented are based on measurement data from heating and cooling periods in 2019
Summary
In combination with the growing demand for thermal comfort in buildings, will result in increased sales numbers and energy demands of air conditioning systems. In combination with a ground-coupled heat pump (GCHP), the geothermal system can be operated efficiently as a renewable heat source during winter with regard to an equalized energy balance of the soil [3] In both periods, summer and winter, peak loads are a common problem. The systems that provide heating or cooling power either get oversized [4] to fit the peak load demand or a conventional backup system is used To counteract this drawback for a specific application, a gas injection geothermal heat exchanger is investigated in combination with a desiccant assisted air conditioning system. A desiccant assisted air conditioning system using a gas injection geothermal heat exchanger (GI-BHX) to cover cooling or heating peak loads is investigated in this study. A performance comparison between a conventional borehole heat exchanger and a GI-BHX is presented
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