Operation characteristics of a novel dual source multi-functional heat pump system under various working modes

Ji, Jie; Wang, Yunyun; Huang, Wenzhu

doi:10.1016/j.apenergy.2016.10.075

Cited by 40 publications

(9 citation statements)

References 33 publications

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“…The operation characteristics of a dual source multifunctional heat pump system were investigated in [7]. A theoretical and experimental analysis of an air source and solar energy heat pump was carried out under various working modes to provide air conditioning and domestic water all year round.…”

Section: Introductionmentioning

confidence: 99%

The Control of Renewable Energies to Improve the Performance of Multisource Heat Pump Systems: A Two-Case Study

2021

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In new and refurbished buildings, different energy sources are usually exploited to reach the Near Zero Energy Building target. Heat pumps and renewables are the most common adopted technologies. The coupling of the different components with a control logic conceived to exploit all energy contributions causes an implied design complexity. In this paper, two case studies were reported regarding the use of multisource heat pump systems: as main novelties, the correct design of the solar field (thermal or photovoltaic/thermal) in relation with the other sources (ground heat exchangers, ventilation heat recovery) for a given building and climate was reported in order to balance the energy drawn and injected into the ground around the year, and to attempt to reach the independency from the electric grid. Moreover, the relatively complex (compared to conventional heating or cooling) system controlling for multisource heat pump plants was simulated. The paper reported on the design of the plant, of the control logic, and the energy performance of two original multisource heat pump systems by means of dynamic simulation. In one case, real measured data were available as well. Very high primary energy ratios were obtained due to suitable control logics of the multisource plants, around 1.4 (based on measured data) and 4.7 (based on simulated data) for the first and second case, respectively. As a consequence, non-renewable primary energy consumptions of 37 and 3.9 kWh m−2 y−1 were determined, respectively.

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Section: Introductionmentioning

confidence: 99%

The Control of Renewable Energies to Improve the Performance of Multisource Heat Pump Systems: A Two-Case Study

2021

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“…However, limited experimental research has taken place on such systems [22]. Cai et al [24] presented experimental and numerical work on an indirect expansion solarassisted multi-functional heat pump tested by a solar simulator. They [20] used an experimental rig to validate a numerical code that was used to study the system.…”

Section: Introductionmentioning

confidence: 99%

“…One way of possibly reducing this effect is with the use of buffer tanks [27]; however, the effect of buffer tanks in IEPVT/HP systems has not been experimentally studied. Another solution would be to integrate solar heat sources with other sources such as air or ground [24]. However, it is important to understand the operation of the solar source in different conditions as this knowledge can be used to optimise the integration of multiple sources into one system.…”

Section: Introductionmentioning

confidence: 99%

Experimental assessment of short cycling in a hybrid photovoltaic-thermal heat pump system

et al. 2020

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An experiment is conducted in this paper to analyse the effect of short cycling phenomenon on the performance of a hybrid photovoltaic-thermal heat pump system. The system utilises indirect expansion to cool a photovoltaic-thermal panel through a photovoltaic-thermal water buffer tank that supplies a heat pump, providing space heating using a convection radiator. A photovoltaic-thermal module rated at 200 W electrically and 650 W thermally is generates electricity and absorbs heat to be utilized by a water-to-water heat pump with heating capacity of 7.77 kW. The system was monitored over one-hour operating times for a range of solar irradiances [250 W/m 2 -650 W/m 2 ], water flow rates through the photovoltaic-thermal module [7.3 l/min -17.3 l/min] and photovoltaic-thermal buffer tank water volumes [45 litres -75 litres]. Results show the system successfully cools the photovoltaic surface by up to 33 o C. This leads to an electrical efficiency increase of up to 0.7%, correlating to a 17.5% increase in generated electricity. The heat pump experiences coefficient of performance values up to 7. Short cycling frequency increased as the solar irradiance increased. Varying water flow rates through the photovoltaic-thermal module have less influence on system performance than solar irradiance, however, increasing the flow rate from 7.3 l/min to 17.3 l/min results in the photovoltaic surface temperature reducing by 1 o C and short cycling frequency increasing. Variation in the photovoltaicthermal buffer tank water volume from 45 to 75 litres decreased the photovoltaic surface temperature by 5 o C and increased the short cycling frequency from 6 cycles/hour to 3 cycles/hour.

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“…HPs are usually comprised of a water-source heat pump (WSHP), a ground-source heat pump (GSHP) [5,6], an air-source heat pump (ASHP) [7], a dual-source heat pump (DSHP), etc. [8].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Performance of a Household Dual-Source Heat Pump Water Heater

Gou

Liu

et al. 2018

Energies

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A household dual source heat pump water heater is proposed to utilize the energy of wastewater and air heat in a bathroom. The heat pump system integrates a wastewater source heat pump (WSHP), air source heat pump (ASHP), and a preheater. This aims at energy saving through recovering the heat of wastewater and ventilation air during the bathing process. The experiment was conducted to verify the feasibility of a dual heat source heat pump water heater system in a bath unit. It is found that the system can achieve an average coefficient of performance (COP) of 4.80 and 4.38 with and without preheater, respectively. At a bath water temperature of 40 °C, a flow rate of 6 L/min, and a room temperature of 26.5 °C, the COP of system can reach 6.08, which shows a significantly promising method for energy saving in-house.

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Operation characteristics of a novel dual source multi-functional heat pump system under various working modes

Cited by 40 publications

References 33 publications

The Control of Renewable Energies to Improve the Performance of Multisource Heat Pump Systems: A Two-Case Study

The Control of Renewable Energies to Improve the Performance of Multisource Heat Pump Systems: A Two-Case Study

Experimental assessment of short cycling in a hybrid photovoltaic-thermal heat pump system

Experimental Study on the Performance of a Household Dual-Source Heat Pump Water Heater

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