Simulations of Combined Solar Thermal and Heat Pump Systems for Domestic Hot Water and Space Heating

Carbonell, Daniel; Haller, Michel Y.; Philippen, Daniel; Frank, Elimar

doi:10.1016/j.egypro.2014.02.062

Cited by 44 publications

(22 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Sterling and Collins conducted comparative research among an IDX‐SAHP system, a conventional solar collector system, and an electric water heating system; the results suggested that the IDX‐SAHP system is the most energy efficient with the lowest operational cost among the three systems. Compared to the serial IDX‐SAHP system, one advantage of the parallel IDX‐SAHP system is that the solar collector and the heat pump work separately, guaranteeing the reliability of the hot water supply in case one of the two parts fails . Another advantage is that the solar collector can provide a large amount of heat when solar radiation is abundant, particularly under summer conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Compared to the serial IDX-SAHP system, one advantage of the parallel IDX-SAHP system is that the solar collector and the heat pump work separately, guaranteeing the reliability of the hot water supply in case one of the two parts fails. 18 Another advantage is that the solar collector can provide a large amount of heat when solar radiation is abundant, particularly under summer conditions. Meanwhile, the thermal performance and operational stability of the parallel IDX-SAHP system are better than those of the serial system.…”

mentioning

confidence: 99%

See 1 more Smart Citation

A performance comparison of serial and parallel solar‐assisted heat pump heating systems in Xi'an, China

Huan

Wang

et al. 2019

Energy Science & Engineering

View full text Add to dashboard Cite

In this study, a TRNSYS model for a solar‐assisted heat pump (SAHP) water heating system for a university bathroom in Xi'an was developed and validated through experimental measurements. Under the typical meteorological conditions in Xi'an, a comparative analysis of the performance of the serial indirect expansion SAHP (IDX‐SAHP) system and the parallel IDX‐SAHP system during different seasons was conducted using the validated model. The results demonstrated that for annual operation, the parallel IDX‐SAHP system showed better performance in the Xi'an district compared to the serial system. Under the same heating load, the average coefficient of performance (COP) of the serial IDX‐SAHP system was 3.23 and that of the parallel IDX‐SAHP system was 4.34. In particular, during summer and the transition season, the parallel IDX‐SAHP system showed large advantages, mainly owing to a larger part of the heating load being provided by the solar collector. However, the serial IDX‐SAHP system showed a higher efficiency than that of the parallel IDX‐SAHP system during winter conditions.

show abstract

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

A performance comparison of serial and parallel solar‐assisted heat pump heating systems in Xi'an, China

Huan

Wang

et al. 2019

Energy Science & Engineering

View full text Add to dashboard Cite

show abstract

“…As for studies that include both air+solar and ground+solar HP systems, Carbonell et al, 2014, simulate two different air+solar HP systems (parallel only, parallel/series with ice storage) with a parallel ground+solar HP; In another study, Carbonell et al, 2013, study the effect of weather/location on parallel air+solar and ground+solar HP systems; Poppi et al, 2016, study the influence of weather/location and component sizing on parallel only air+solar HP, as well as ground+solar HP systems; Ochs et al, 2014, study the optimum share of solar thermal and solar photovoltaic in both air+solar and ground+solar HP systems.…”

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

View full text Add to dashboard Cite

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.

show abstract

“…The authors presented summaries of simulations which were performed by different authors and different simulation platforms using the boundary conditions of IEA SHC Task 44 / HPP Annex 38. Investigations focused on SGSHP-P and SASHP-P systems can be found in Carbonell et al (2014aCarbonell et al ( , 2014b, Jonas et al (2017a) and Poppi et al (2016).…”

Section: Introductionmentioning

confidence: 99%

Model-Based Analysis of Solar Thermal and Heat Pump Systems Using TRNSYS

Jonas¹,

Theis²,

Meiers³

et al. 2017

Proceedings of SWC2017/SHC2017

View full text Add to dashboard Cite

The combination of solar thermal and heat pump (STHP) systems is a promising hybrid concept for the efficient and sustainable energy supply of buildings. In general, the modeling and simulation of such complex energy systems is a challenging task as it requires expert knowledge in modeling as well as in the behavior of the real systems. As an alternative to the complex and lengthy general modeling process, a TRNSYS-based stand-alone tool is presented which enables users to analyze different predefined SHP concepts with hardly any knowledge in modeling and simulation itself. The predefined STHP concepts are explained in detail and the simulation results for a comparison of the performance of different system concepts are presented. The predefined systems are ground or air source heat pump systems with or without parallel integration of solar thermal collectors. In addition to earlier work, these system concepts are extended by solar thermal and ice storage heat pump systems. On the one hand, the simulation results show that in case of moderate climate and new as well as renovated buildings, solar thermal and air source heat pump systems can compete with ground source heat pump systems without solar integration and can achieve the same or even higher values of seasonal performance factors. On the other hand, the results show that solar thermal and ice storage systems are efficient solar thermal heat pump systems, which can achieve higher SPFs than air source heat pump systems and for new buildings even SPFs in the range of ground source heat pump systems. Furthermore, this contribution shows the advantages and the possible performance improvements by parallel integration of solar collectors in different system concepts.

show abstract

Simulations of Combined Solar Thermal and Heat Pump Systems for Domestic Hot Water and Space Heating

Cited by 44 publications

References 7 publications

A performance comparison of serial and parallel solar‐assisted heat pump heating systems in Xi'an, China

A performance comparison of serial and parallel solar‐assisted heat pump heating systems in Xi'an, China

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

Model-Based Analysis of Solar Thermal and Heat Pump Systems Using TRNSYS

Contact Info

Product

Resources

About