Energy Savings through Variable Speed Compressor Heat Pump Systems

Adhikari, R.S.; Aste, N.; Manfren, Massimiliano; Marini, Dashamir

doi:10.1016/j.egypro.2011.12.1098

Cited by 36 publications

(8 citation statements)

References 3 publications

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“…The backup electric heating requirements was studied by Karlsson and Fahlen [62]. The three climatic conditions of Italy (Milan, Rome, Palermo, and significant energy savings with variable speed control specifically at Palermo and Rome during the heating seasons because of part load operation of the system for most of the time were investigated in [61]. The heat supply temperature in the ON/OFF control mode during the on-cycle needs to be higher compared to the continuous system operation which leads to lower performance and higher energy consumptions [63].…”

Section: Literature Reviewmentioning

confidence: 99%

Domestic Retrofit Assessment of the Heat Pump System Considering the Impact of Heat Supply Temperature and Operating Mode of Control—A Case Study

et al. 2021

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In this study, performance assessment of the variable speed compressor-based air source heat pump (ASHP) system as a domestic retrofit technology instead of fossil fuel-based heating technologies for the 1900s Mid terraced house is investigated. The assessment was conducted considering operating mode of control and heat supply temperature impact of the system. In the literature, ASHP system experimental development with variable speed mode (VSM) of control in comparison to fixed speed mode (FSM) of control at low to medium and high heat supply temperature in the context of UK was found with very limited number of studies, but without considering retrofit application. The focus of the earlier studies was on the individual components and performance improvement. The designed heat pump (HP), developed, and tested at constant heat load, simulating the real domestic heat demand under the controlled laboratory conditions and numerical modeling is utilized for the analysis purposes. The HP performance, energy demand, carbon emissions, and cost varies significantly due to changing heat supply temperature (35 °C, 45 °C, and 55 °C), control mode and accordingly the carbon emission and cost savings are achieved. The oil and gas boilers ranges from conventional to highly efficient type and evaluated in terms of annual running cost, energy consumptions, and carbon emissions in comparison with the HP system. Additionally, a comparative study with the existing retrofitted very high temperature ASHP inside the house is conducted. The developed HP at 55 °C could not defeat the very high heat supply temperature HP system (75 °C supply temperature) in performance and cost savings but become attractive at low supply temperature (35 °C). The HP system in VSM at low heat supply temperature instead of gas boiler (90% efficiency) could cut the annual carbon emissions by 59% but with additional 6% running cost for the Mid terraced test house in Belfast climatic conditions.

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Section: Literature Reviewmentioning

confidence: 99%

Domestic Retrofit Assessment of the Heat Pump System Considering the Impact of Heat Supply Temperature and Operating Mode of Control—A Case Study

et al. 2021

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“…The heat supply temperature with intermittent control during the on-cycle needs to be higher compared to the continuous system operation, leading to lower performance and higher energy consumption [23]. The three climatic conditions of Italy (Milan, Rome, Palermo) were investigated in [24]. Significant energy savings were achieved with variable speed control specifically in Palermo and Rome during the heating seasons due to idle operation of the system for most of the time.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The heat supply temperature with intermittent operations during the on-cycle needs to be higher compared to the continuous system operation, leading to high energy consumption due to higher condensation and lower evaporation temperature [23]. The climatic conditions and the associated benefits with VSM were found to be interlinked, with higher performance improvement in warm climate conditions due to idle operations of the system for most parts of the year [24]. A limited number of articles were found investigating performance improvement and energy savings with the control mode and considering heat supply temperature simultaneously for other HP types [21,31,34].…”

Section: Literature Reviewmentioning

confidence: 99%

Performance Analysis of the Developed Air Source Heat Pump System at Low-to-Medium and High Supply Temperatures for Irish Housing Stock Heat Load Applications

et al. 2021

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Decarbonization of the UK residential heating sector is crucial to cut the carbon emissions and meet the legal binding of the Climate Change Act, 2008. The current progress with residential building sector carbon neutrality is slow and, hence, acceleration in action is required. The heat pump (HP) technology was found to be a potential candidate for sustainable development instead of fossil fuel-based oil/gas boilers, but improvement in its coefficient of performance (COP) is essential to compete with the lower gas/oil unit energy cost. The number of studies found in the literature were very limited, with the customized prototype development in the context of Northern Ireland, but without considering the simultaneous impact of heat supply temperature and operating mode of control for performance improvement in different property types. It is evidenced in the literature that the variable speed capacity control approach could improve the annual performance, but the literature has not looked into the compressor efficiencies challenges. In this study, steady state testing with a range of fixed constant heat loads (3–18 KW), done by varying compressor speed and its impact on COP, compressor efficiencies, and inverter losses, was established. The HP performance was measured and evaluated at low (35 °C)-to-medium (45 °C) and high (55 °C) heat supply temperature levels under the controlled laboratory conditions over the experienced ambient temperature. According to the result the COP values varies according to heat supply temperature, ambient temperature conditions, and heating capacity. The HP annual performances with Irish housing stock were evaluated in two modes of control and three case studies (C1, C2, C3) based on the experimentally validated model. The heat load demand in five property types with four age periods were considered in the analysis. The system could meet the required heat load demand for all property types in VSM with different percentage improvements in performance in comparison to FSM depending on the considered case level of the heat supply temperature (C1, C2, C3).

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“…For this purpose, location registered by geographical information systems (GIS) provide a local community database and starting point to go for new renewables accounting for surroundings' needs and criticalities [32]. Beside this, large-scale data analytics and modelling to optimize multi-energy systems [33] with analytics of penetration of RES, such as PV or new technologies such as heat pump (HP) [34], are useful in multiple operating conditions. It is possible to consider relevant constraints such as load matching and integration in sensitive environments [35] or where the connection to the power grid is weak or even absent [36].…”

Section: Introductionmentioning

confidence: 99%

Solar Energy Data Analytics: PV Deployment and Land Use

Mancini

Nastasi

2020

Energies

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EU targets for sustainable development call for strong changes in the current energy systems as well as committed protection of environmental resources. This target conflicts if a policy is not going to promote the compatible solutions to both the issues. This is the case of the additional renewable energy sources to be exploited for increasing the share in the electricity mix and in the gross final energy consumption. Solar energy is, currently, the cheapest solution in Southern European Countries, like Italy. In this paper, thanks to the availability of three open databases provided by National Institutions, the authors compared the historic trends and policy scenarios for soil consumption, electricity consumption, and renewable electricity production to check correlations. The provincial scale was chosen as resolution of the analysis. The deviations from the policy scenarios was then addressed to identify the demand for policy recommendations and pathways to promote in order to achieve the target for renewable electricity share as well as the reduction in soli consumption trend in 2030. The role of renewables integrated in the existing contexts, such as building integrated photovoltaics, is considered a key driver for solving this issue.

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Energy Savings through Variable Speed Compressor Heat Pump Systems

Cited by 36 publications

References 3 publications

Domestic Retrofit Assessment of the Heat Pump System Considering the Impact of Heat Supply Temperature and Operating Mode of Control—A Case Study

Domestic Retrofit Assessment of the Heat Pump System Considering the Impact of Heat Supply Temperature and Operating Mode of Control—A Case Study

Performance Analysis of the Developed Air Source Heat Pump System at Low-to-Medium and High Supply Temperatures for Irish Housing Stock Heat Load Applications

Solar Energy Data Analytics: PV Deployment and Land Use

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