An economic comparison of a fixed speed, a two speed, and a variable speed vapour compression heat pump

Marquand, C.J.; Tassou, S.A.; Wang, Y.T.; Wilson, D.R.

doi:10.1016/0306-2619(84)90027-8

Cited by 9 publications

(5 citation statements)

References 2 publications

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“…The variable speed compressor of the HP for the capacity control have proved more efficient in this context [47][48][49]. Conventional way of controlling the heating capacity is the intermittent operation of compressor and comparative study between the variable speed and on/off control have been conducted by [50][51][52][53][54][55][56] reporting an efficiency improvement in the range of 10-25% [57]. The reason for performance improvement was better part load efficiency, match between the supply and demand, a smaller number of on/off cycles, unloading of heat exchangers, less requirements for back up electric heater, and smaller frosting losses [58].…”

Section: Literature Reviewmentioning

confidence: 99%

“…The study combining the ASHP performance with economic aspects of VSM in comparison to FSM at single water heat supply temperature of 55 • C was performed by [50]. The aim was to study the payback period with variable speed control mode, for detached type building, with no considerations of climatic conditions influence and retrofit assessment.…”

Section: Research Gaps and Contribution To The Knowledgementioning

confidence: 99%

“…The additional cost associated with VSM against FSM was calculated as GBP 1000 (in- The issue with the HP retrofit is the higher initial capital cost, extra control devices in VSM, and heating distribution installation required for low heat supply temperature. The additional cost associated with VSM against FSM was calculated as GBP 1000 (inverter and additional control devices) using approach suggested by [50,68], and the heating distribution installations cost as GBP 6000 [42]. The unit capital cost for 8 kW HP system and installation was 8750 pounds with an 44% additional cost for the existing heating distribution system replacement because of emitters reduction in capacity due to lower delta T. The only upgradation of existing radiators system is less expensive compared to the new heating distribution system installation with combination of underfloor heating at the ground floor and radiators at upper floor.…”

Section: Different Locationsmentioning

confidence: 99%

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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%

Section: Research Gaps and Contribution To The Knowledgementioning

confidence: 99%

Section: Different Locationsmentioning

confidence: 99%

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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 terms of seasonal energy efficiency, inverter-driven heat pumps can lessen energy consumption in a building by 1) lower start-stop (cycling) losses, 2) improved refrigerant cycle performance because• of decreased compression ratios and reduced heat exchanger loading during low speed operation, and 3) lower fan power requirements through variation of air flow rates. The findings of Hori et al (1985), !ida et al (1982), Marquand et al (1984), Mills (1987), Thssou et at. (1983), and Umezu and Suma (1984) show inverter-driven heat pumps can achieve seasonal energy savings of 15% to 40%.…”

Section: 4mentioning

confidence: 99%

Japanese power electronics inverter technology and its impact on the American air conditioning industry

Ushimaru¹

1990

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“…Moreover, the peak loads required from the grid were reduced by 24% using the proposed control strategy. The use of variable speed heat pump units is a promising solution, because of higher performance levels at part-load operation [14,15]. Moreover, the heat pump output can be modulated according to the solar energy availability to optimize self-consumption.…”

Section: Introductionmentioning

confidence: 99%

Rule-Based Control Strategy to Increase Photovoltaic Self-Consumption of a Modulating Heat Pump Using Water Storages and Building Mass Activation

2020

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The use of photovoltaic (PV) energy in combination with heat pump systems for heating and cooling of residential buildings can lead to renewable energy self-consumption, reducing the energy required from the grid and the carbon footprint of the building uses. However, energy storage technologies and control strategies are essential to enhance the self-consumption level. This paper proposes and analyzes a new control strategy for the operation of a modulating air-source heat pump, based on the actual PV availability. The solar energy surplus is stored as thermal energy by the use of water tanks and the activation of the thermal capacitance of the building. The efficacy of the control strategy is evaluated considering different rule-based strategies, and different boundary conditions. The effect of climate data, building insulation level and thermal inertia are investigated and compared. The results show the efficacy of the proposed strategy to decrease up to 17% the amount of electricity purchased from the grid and to increase the self-consumption by 22%, considering a high-insulated building in Bolzano, Northern Italy. The thermal mass activation is found effective to increase the self-consumption of the system. Nonetheless, the achievable energy reduction depends largely on the building characteristics and the boundary conditions.

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An economic comparison of a fixed speed, a two speed, and a variable speed vapour compression heat pump

Cited by 9 publications

References 2 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

Japanese power electronics inverter technology and its impact on the American air conditioning industry

Rule-Based Control Strategy to Increase Photovoltaic Self-Consumption of a Modulating Heat Pump Using Water Storages and Building Mass Activation

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