Partial load efficiency degradation of a water-to-water heat pump under fixed set-point control

Waddicor, David A.; Fuentes, E.; Azar, Marc; Salom, Jaume

doi:10.1016/j.applthermaleng.2016.05.193

Cited by 39 publications

(19 citation statements)

References 8 publications

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“…In the sigmoid function t 50 is the time required to achieve 50% of the nominal heating capacity and s is a length parameter of the sigmoid function. The electrical power is assumed to reach instantly its nominal value at the onset of the start-up period [5,6,10] and the evaporator thermal energy rate during the start-up is calculated from the energy rate balance between the condenser thermal power and the electrical power consumption of the heat pump.…”

Section: T 4 +B 3 T 3 +B 2 T 2 +B 1 T (9)mentioning

confidence: 99%

Validation of black-box performance models for a water-to-water heat pump operating under steady state and dynamic loads

Fuentes

Salom

2019

E3S Web Conf.

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The use of simple mathematical models for describing the behaviour of heat pumps is important for assessing the energy performance of this equipment when installed in buildings. However, because of their simplicity, commonly used simple models, may not be able to fully account for the dynamic performance of heat pumps during transient phases. In this study, different performance black box models for an on-off water-to-water heat pump are validated by comparison with laboratory experimental results at steady state and dynamic cycling conditions. The models range from the solution based on the interpolation on the heat pump performance map to the detailed dynamic solution that combines correlations for the quasi-steady state operation and activation functions to model the transient phases. The output temperatures, electrical and thermal power and coefficient of performance from simulations were compared with experimental data from a water-to-water heat pump of 40.5 kW nominal heating capacity operating under cycling conditions. After validation with experiments, annual energy performance simulations of a tertiary building provided with a heat pump were conducted. These simulations quantifying the uncertainty expected when using heat pump performance models in simulation environments for estimating their annual energy performance.

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Section: T 4 +B 3 T 3 +B 2 T 2 +B 1 T (9)mentioning

confidence: 99%

Validation of black-box performance models for a water-to-water heat pump operating under steady state and dynamic loads

Fuentes

Salom

2019

E3S Web Conf.

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“…This is noticeable that the actual value of this parameter is much lower than the one assumed in the calculations. The problem of estimating the degradation coefficient is also analyzed in the work [3] where the importance of this issue was emphasized. represent the actual work of the tested heat pump.…”

Section: Operation Under Partly Load In the Current European Standardsmentioning

confidence: 99%

“…The standard EN 14825 defines the COP pl taking into account the impact of the partial load factor as a function of PLR and Cc, described by equation (3). The PLR is the ratio of the building's heat demand (Q H ) to the current capacity of the heat pump (Q HP ).…”

Section: Operation Under Partly Load In the Current European Standardsmentioning

confidence: 99%

“…The greater the disproportion, the shorter the compressor cycles and the higher the number of on-off cycles. In consequence, a significant degradation of the energy efficiency compared to manufacturer data based on EN 14511 [2] standard is observed [3]. According to this standard, the tests are carried out in steady state conditions at full capacity, hence many aspects of the actual work in dynamic conditions are not considered.…”

Section: Introductionmentioning

confidence: 99%

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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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“…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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Partial load efficiency degradation of a water-to-water heat pump under fixed set-point control

Cited by 39 publications

References 8 publications

Validation of black-box performance models for a water-to-water heat pump operating under steady state and dynamic loads

Validation of black-box performance models for a water-to-water heat pump operating under steady state and dynamic loads

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

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

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