ElsevierRuiz Calvo, F.; Rosa, MD.; Acuña, J.; Corberán Salvador, JM.; Montagud Montalvá, CI. (2015). Experimental validation of a short-term AbstractThe design and optimization of ground source heat pump systems require the ability to accurately reproduce the dynamic thermal behavior of the system on a short-term basis, specially in a system control perspective.In this context, modelling borehole heat exchangers (BHEs) is one of the most relevant and difficult tasks. Developing a model that is able to accurately reproduce the instantaneous response of a BHE while keeping a good agreement on a long-term basis is not straightforward. Thus, decoupling the short-term and long-term behavior will ease the design of a fast shortterm focused model. This work presents a short-term BHE dynamic model, called Borehole-to-Ground (B2G), which is based on the thermal network approach, combined with a vertical discretization of the borehole.The proposed model has been validated against experimental data from a real borehole located in Stockholm, Sweden. Validation results prove the ability of the model to reproduce the short-term behavior of the borehole with an accurate prediction of the outlet fluid temperature, as well as the internal temperature profile along the U-tube.
ElsevierMonzó Cárcel, PM.; Mogensen, P.; Acuña, J.; Ruiz Calvo, F.; Montagud Montalvá, CI. (2015). A novel numerical approach for imposing a temperature boundary condition at the borehole wall in borehole fields. Geothermics. 56:35-44.
This paper presents the evaluation of the performance of a ground source heat pump system monitored plant providing heating/cooling to an office building located in the Universitat Politècnica de València in Spain. The system was designed using GLHEPRO software and it has been monitored since 2005. Once a ground source heat pump has been designed, it is important to analyze its performance along the years after its construction and check whether the design was appropriate and the simulation predictions were consistent with real experimental measurements. This paper first presents the impact of the GSHP system in the ground thermal response. The simulations obtained in GLHEPRO software will be analyzed and compared to experimental measurements. The second purpose of this work is to compare the performance simulation results of a complete ground source heat pump system model built in TRNSYS, with the experimental measurements which have been registered and collected for one cooling day. Numerical predictions and experimental results are compared and discussed. ELSEVIER Applied EnergyValencia, July 30 th 2012Subject: Article Submission.To whom it may concern, Considering two crucial elements, efficiency and sustainability, the Institute for Energy Engineering (IIE) has clearly established itself as an outstanding reference in the field of energy efficiency, modeling and optimization. The Institute's scientific production is represented not only by different activities carried out by the research groups working at the IIE, but also by the results attained from numerous R&D projects, being of special interest the articles published in high impact scientific journals and the presentations delivered in most relevant international forums.Following this dissemination policy, and as member of the Thermal Engineering Area within the IIE, I accompanied to this letter the research manuscript, including some of the results of the ground source heat pump systems line of research. This paper presents the evaluation of the performance of a ground source heat pump system, providing heating/cooling to an office building. The impact of the GSHP system in the ground thermal response is analyzed and compared to GLHEPRO software simulation results. It has been observed from experimental measurements that the ground has a stronger recovery capability than expected when compared to GLHEPRO results, which allows the water temperature coming from BHE present a periodic evolution along the years, being the mean water return temperature of the BHE equal to 20ºC for every year of operation and confirming well designed and balanced GSHP systems as a good alternative. In parallel, a complete model of the system was built in TRNSYS and experimentally validated, so that it is able to reproduce the behavior of the real installation taking every influence into account and makes it possible to develop control strategies to optimize the system energy performance.Finally, I take this chance to show my gratitude for you taking the time to re...
Coupling short-term (B2G model) and long-term (g-function) models for ground source heat exchanger simulation in TRNSYS. Application in a real installation.. Applied Thermal Engineering AbstractGround-source heat pump (GSHP) systems represent one of the most promising techniques for heating and cooling in buildings. These systems use the ground as a heat source/sink, allowing a better efficiency thanks to the low variations of the ground temperature along the seasons. The ground-source heat exchanger (GSHE) then becomes a key component for optimizing the overall performance of the system. Moreover, the short-term response related to the dynamic behaviour of the GSHE is a crucial aspect, especially from a regulation criteria perspective in on/off controlled GSHP systems. In this context, a novel numerical GSHE model has been developed at the Instituto de Ingeniería Energética, Universitat Politècnica de València. Based on the decoupling of the short-term and the longterm response of the GSHE, the novel model allows the use of faster and more precise models on both sides. In particular, the short-term model considered is the B2G model, developed and validated in previous research works conducted at the Instituto de Ingeniería Energética. For the long-term, the g-function model was selected, since it is a previously validated and widely used model, and presents some interesting features that are useful for its combination with the B2G model. The aim of the present paper is to describe the procedure of combining these two models in order to obtain a unique complete GSHE model for both short-and long-term simulation. The resulting model is then validated against experimental data from a real GSHP installation.
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