Combining Heat Pumps with Combistores: Detailed Measurements Reveal Demand for Optimization

Haberl, Robert; Haller, Michel Y.; Reber, Andreas; Frank, Elimar

doi:10.1016/j.egypro.2014.02.042

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…Institute/Company: Institut für Solartechnik, SPF, Rapperswil, Switzerland Summary written by: Robert Haberl, Andreas Reber, Michel Y. Haller, October 2013 Published in (if available): A final report will be pulished as an SFOE (Swiss Federal Office of Energy) report for the project SOL-HEAP by early 2014. Part of the results are also discussed in more detail in Haberl et al (2013).…”

Section: Laboratory Tests Of Eleven Shp Systems (Number 3 -14)mentioning

confidence: 99%

Testing Solar and Heat Pump Systems in laboratory

Malenkovic¹,

Facão²,

Katic³

et al. 2013

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The Solar Heating and Cooling Programme was founded in 1977 as one of the first multilateral technology initiatives ("Implementing Agreements") of the International Energy Agency. Its mission is "to enhance collective knowledge and application of solar heating and cooling through international collaboration to reach the goal set in the vision of solar thermal energy meeting 50% of low temperature heating and cooling demand by 2050.The member countries of the Programme collaborate on projects (referred to as "Tasks") in the field of research, development, demonstration (RD&D), and test methods for solar thermal energy and solar buildings.A total of 52 such projects have been initiated to-date, 39 of which have been completed. Research topics include:

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Section: Laboratory Tests Of Eleven Shp Systems (Number 3 -14)mentioning

confidence: 99%

Testing Solar and Heat Pump Systems in laboratory

Malenkovic¹,

Facão²,

Katic³

et al. 2013

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“…If charging the storage space heat zone by this inlet disturbs the zone above that is reserved for DHW, the heat pump switches to DHW charging more frequently than necessary, and is thus providing heat at higher temperatures than required. This leads to a significant decrease of the systems exergetic and energetic efficiency -as shown by Haller et al (2014) and Haberl et al 2014. A rare example of CFD simulations and laboratory experiments for the inlet ad mid height of a combi-storage was published by Drück (2007) for water inlet velocities from 0.2 to 2.0 m/s.…”

Section: Introductionmentioning

confidence: 99%

Disturbance of Stratification Caused by Direct Horizontal Inlets into a Water Storage Tank

Haller¹,

Mojic²,

Kaufmann³

et al. 2015

Proceedings of the EuroSun 2014 Conference

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Water based combi-storages are frequently used in Central Europe for storing heat for space heating and domestic hot water in one device. The stratification efficiency of direct combi-storage inlets has a decisive influence on the energetic efficiency of solar thermal systems and even more of heat pumps that are connected to combi-storages. However, there are currently no simple recommendations for the geometrical design of direct storage inlets together with scientifically supported values for maximum mass flow rates that can be used for charging without disturbing stratification in the storage. In this work, the effect of different geometrical designs and mass flow rates on stratification of the storage was studied for direct storage inlets with computational fluid dynamics. Selected experiments were validated with laboratory tests.

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“…Regarding ground+solar HP systems, both Girard et al, 2015, andBertram, 2014, simulate the impact of adding solar collectors to a ground source HP system; Haberl et al, 2014, analyse the performance of a parallel system as well as it's optimization; Both Cimmino and Eslami-Nejad, , and Rad et al, 2013, evaluate the performance of regeneration systems; Reda, 2015, studies different control strategies of a parallel/regeneration system; Comodi et al, 2015, study a parallel system that includes also photovoltaic panels.…”

Section: Introductionmentioning

confidence: 99%

Solar assisted heat pump system for multifamily buildings: Towards a seasonal performance factor of 5? Numerical sensitivity analysis based on a monitored case study

et al. 2017

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The present work analyses the potential of a combined solar thermal and heat pump (HP) system on new and existing multifamily buildings. The study uses numerical simulation as a complement to a monitored case study. After a description of the case study and a summary of the monitoring results, we present the numerical model developed for this study. Simulation results are validated with the monitored values, at component and system level, in terms of monthly profiles and yearly integrals. On this basis, we carry out an extensive sensitivity analysis concerning the principal sizing parameters of the system. Finally, we investigate the sensitivity of the system to space heating (SH) and domestic hot water (DHW) demands, in particular concerning the applicability of the analysed system in the case of building retrofit. For Geneva's weather conditions, a sizing factor of 3 m 2 solar collector per kW of HP capacity is a good compromise between system size and system performance, resulting in a system seasonal performance factor (SPF sys) between 3.1 and 4.1, depending on the SH distribution temperature. The associated electricity consumption (ranging from 12 kWh/m 2 for a new low-energy building, up to 45 kWh/m 2 for a non-retrofitted building) strongly depends on the heat demand. Such is also the case for the collector area (from 0.08 m 2 per m 2 heated area for a new low-energy building, up to 0.20 for a non-retrofitted building). Finally, a SPF sys of 5 could potentially be achieved, but only in newly constructed buildings with a high efficient envelope, a low SH distribution temperature, and with a collector area of at least 0.20-0.25 m 2 per m 2 heated area. However, the related investment may not be worthwhile, given the rather small associated electricity saving, not to mention that such a collector area would not fit on buildings with more than 4 storeys.

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Combining Heat Pumps with Combistores: Detailed Measurements Reveal Demand for Optimization

Cited by 6 publications

References 2 publications

Testing Solar and Heat Pump Systems in laboratory

Testing Solar and Heat Pump Systems in laboratory

Disturbance of Stratification Caused by Direct Horizontal Inlets into a Water Storage Tank

Solar assisted heat pump system for multifamily buildings: Towards a seasonal performance factor of 5? Numerical sensitivity analysis based on a monitored case study

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