Partialization losses of ON/OFF operation of water-to-water refrigeration/heat-pump units

Corberán, J M; Donadello, D.; Martínez-Galván, I; Montagud, C.

doi:10.1016/j.ijrefrig.2013.07.002

Cited by 24 publications

(12 citation statements)

References 5 publications

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“…for 60% heat load (which implies 40% of time in the stand-by mode) it equals about 25%. Similar results were observed in other studies [4,5]. Fig.…”

Section: Analysis Of the Heat Pump's Monthly Energy Efficiencysupporting

confidence: 92%

The impact of the work under partial load on the energy efficiency of an air-to-water heat pump

2017

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Abstract. The energy efficiency of air-to-water heat pumps used for central heating depends significantly on the correctness of the device choice. Under given climate conditions, the temperature of the bivalent point defines the amount of energy supplied from an additional source, usually an electric heater, in periods when the power of the heat pump is too low. Commonly overlooked fact is that excess capacity is also unfavourable and has significant, negative impact on the energy efficiency of such a system. In the article, basing on the measurement data of the real installation of the air-to-water heat pump, a significant decrease in the energy efficiency of the device during periods of low energy demand was shown. The average monthly value of SCOP in the warm months was similar or even lower than in the winter months. The reason of this is the operation of the device under partial load. Although the values of COP were very high in short periods of operation, frequent switching on and off of the heat pump reduced its energy efficiency. Also, the length of operation in stand-by mode, i.e. the length of the periods between successive heating cycles, had negative influence on energy efficiency.

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“…for 60% heat load (which implies 40% of time in the stand-by mode) it equals about 25%. Similar results were observed in other studies [4,5]. Fig.…”

Section: Analysis Of the Heat Pump's Monthly Energy Efficiencysupporting

confidence: 92%

The impact of the work under partial load on the energy efficiency of an air-to-water heat pump

2017

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“…Taking into account the results of previous work [2] and the literature [5,7,8] which challenge the method described in the EN 14825 standard, a new definition and calculation approach to the degradation coefficient were proposed. The analytical approach proposed by the authors is aimed to test the devices in semi-dynamic conditions instead of single point measurements.…”

Section: The Assumptions For the Modelmentioning

confidence: 99%

Quasi-dynamic model of the energy efficiency degradation coefficient for an air-to-water heat pump

2018

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Abstract. Operating in part-load conditions significantly affects the energy efficiency of the air-to-water heat pumps. The currently used method of testing the devices does not provide the necessary data for estimating the degradation of the device's efficiency in part-load operating mode. The value of the degradation coefficient Cc = 0.9 adopted in accordance with the EN 14825 standard is generally used. However, this value often does not reflect the actual degree of the COP reduction. Hence the new quasidynamic model and the calculation approach to the degradation coefficient were proposed. The model reflects the real and overall reduction between the full and part-load COP, not only the energy consumption in the standby mode. The estimation was made using the field measurement data of the air-to-water heat pump supplying heat to the low temperature installation. It has been proved that the determination of the main parameter is possible using a relatively small amount of data without losing an accuracy.

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“…Even though these data are valid for steady-state operation, they can accurately describe the heat pump performance in dynamic operation, as shown by Waddicor et al (2016) and Corberán et al (2013).…”

Section: Heat Pump Operation and Datamentioning

confidence: 99%

Modelling of a water-to-air variable capacity ground-source heat pump

Bouheret

Bernier

2017

Journal of Building Performance Simulation

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Partialization losses of ON/OFF operation of water-to-water refrigeration/heat-pump units

Cited by 24 publications

References 5 publications

The impact of the work under partial load on the energy efficiency of an air-to-water heat pump

The impact of the work under partial load on the energy efficiency of an air-to-water heat pump

Quasi-dynamic model of the energy efficiency degradation coefficient for an air-to-water heat pump

Modelling of a water-to-air variable capacity ground-source heat pump

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