Experimental study on R1234yf heat pump at low ambient temperature and comparison with other refrigerants

Xu, Shuxue; Niu, Jilei; Ma, Guoyuan

doi:10.2298/tsci171019201x

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…The energy cost of such a system is not higher than meeting the same heating needs on a natural gas basis and cooling needs using electrical energy. By optimizing the heat pump cycle and selecting the appropriate refrigerant, the COP values can be further improved [21,22,23], resulting in a further reduction in energy consumption. Our long-term goal is to investigate the application possibilities of natural refrigerants, as they have additional environmental and energy benefits.…”

Section: Discussionmentioning

confidence: 99%

Energy efficient solution in the brewing process using a dual-source heat pump

2022

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In this paper, the investigation of an experimental heat pump equipment is presented. This equipment is capable of serving two different temperature cooling needs and a given temperature heating demand within a given industrial process, adapting to its time and performance requirements. The use of a heat pump is energetically advantageous, if a nearly continuous operation can be realized in the course of an industrial process to serve simultaneous cooling and heating needs. In the field of brewing, it was demonstrated by model experiments that CO2 emissions can be reduced by 60% with a 10% reduction in energy costs if the energy requirements are satisfied using a dual-source heat pump.

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Section: Discussionmentioning

confidence: 99%

Energy efficient solution in the brewing process using a dual-source heat pump

2022

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“…While obtaining work from supplied heat, the general idea is to obtain as much as possible useful work, having in mind that heat removed to a heat sink is not a loss, but necessary compensation to obtain useful work from heat. In the case of a heat pump, maximum efficiency is reached when heat pumps operate in the ideal Carnot cycle with reversible processes (isentropic and isothermal processes), with efficiency dependent only on heat source temperature (evaporation temperature) and heat sink temperature (condensing temperature) [17]: (8) All real thermodynamic cycles have efficiency lower than the Carnot cycle situated between the highest and the lowest temperature of a real cycle. The energy-based efficiency measure (Coefficient of performance) of the overall heat pump system under consideration in this paper can be defined as follows:…”

Section: Methodology and Modellingmentioning

confidence: 99%

“…Adopting an internal heat exchanger has the potential of lowering the differences of performance, besides approaching the L-41b performance to that attained with the use of R410A in the existing air-source heat pump. The refrigerant R410A is used a lot in vapour compression refrigeration and air conditioning systems due to its high energy efficiency ratio [8].…”

Section: Introductionmentioning

confidence: 99%

Air-source heat pump performance comparison in different real operational conditions based on advanced exergy and exergoeconomic approach

et al. 2021

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The use of air-source heat pumps (ASHP) is increasing to meet the energy needs of residential buildings, and manufacturers of equipment have permanently expanded the range of work and improved the coefficient of performance (COP) in very adverse outdoor air conditions. However, in the time of a wide range of different technologies, the problem of using ASHP, from a techno-economic point of view, is constantly present. Although exergy is the only thermodynamic parameter compatible with economic principles, methods based on conventional exergy analysis are no longer able to respond to the extremely demanding needs of the actual market. Exergetic efficiency and exergoeconomic cost no longer provide sufficiently reliable information when it is necessary to reduce the investment costs or increase the energy/exergetic efficiency of the component/system. This paper presents a performance comparison of ASHP in different real operational conditions based on an advanced exergy and exergoeconomic approach. The advanced exergy analysis splits the destruction of exergy for each individual component of the heat pump into avoidable and unavoidable exergy destruction in order to fully understand the processes. In exergoeconomic performance evaluation, the information of stream costs is used as the information to calculate exergoeconomic variables associated with each system component. Irreversibilities in the compressor have the greatest impact on reducing the overall system exergetic efficiency by 46.7% during underfloor heating (UFH) operation and 24.53% during domestic hot water (DHW) operation. Exergy loss reduces exergetic efficiency by 5.72% (UFH) and 39.74% (DHW). High values of exergoeconomic cost for both operating regimes are present in flows 1, 2, 3 and 4 due to high costs of production and relatively small exergy levels. The general recommendation is to set the ASHP to operate with near-optimal capacities in both regimes and then reduce exergy of flows 1, 2, 5, 11 and 13. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. 451-03-68/2020-14200109]

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“…Most heat pump systems in common use today are of the vapour-compression type 2]. The R410A refrigerant fluid is frequently used in the vapour-compression type of refrigeration and air-conditioning systems due to its high energy efficiency ratio [3].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Air-Source Heat Pump in Different Real Operational Conditions for Heating Distinctive Regimes

Vučković

Vukić

Stojiljković

et al. 2020

FU Work Liv Env Prot

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In a time of permanent care for environmental protection, energy consumption and conservation of resources, heat pumps are becoming increasingly important as a technology for reducing greenhouse gas emissions while preservation thermal comfort in build environment. This paper presents the experimental results of air-source heat pump in different real operating conditions, as follows: for space heating by low-temperature underfloor heating when the supply water temperature was set at 38°C, or for domestic hot water heating in the storage tank volume of 180 liters at a temperature of 46°C. In the low-temperature underfloor heating mode, the efficiency of the air-source heat pump could be increased if the maximum temperature at the end of the compression process and the condensing temperature were reduced in the initial phase of the heat pump operation. In the domestic hot water heating mode, the efficiency of the air-source heat pump could be increased if the maximum condensation temperature in the final phase of the heat pump operation was limited.

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Experimental study on R1234yf heat pump at low ambient temperature and comparison with other refrigerants

Cited by 6 publications

References 19 publications

Energy efficient solution in the brewing process using a dual-source heat pump

Energy efficient solution in the brewing process using a dual-source heat pump

Air-source heat pump performance comparison in different real operational conditions based on advanced exergy and exergoeconomic approach

Experimental Investigation of Air-Source Heat Pump in Different Real Operational Conditions for Heating Distinctive Regimes

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