Impact of control schemes of a monovalent inverter-driven water-to-water heat pump with a desuperheater in continental and subtropical climates through simulation

Blanco, David; Nagano, Katsunori; Morimoto, Masahiro

doi:10.1016/j.apenergy.2012.12.047

Cited by 8 publications

(5 citation statements)

References 17 publications

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“…A similar concept was recently introduced by Blanco et al (2013aBlanco et al ( , 2013bBlanco et al ( , 2012. The cycle SGC 2 illustrates the setup, which includes a desuperheater (HT) and a condenser (MT), deliberately splitting the gas cooling and the condensation process into two parts.…”

Section: Separated Gas Cooler Cyclesmentioning

confidence: 98%

“…Heat pump with separated gas cooler and desuperheater  1 compressor  2 condensers (HT, MT)  1 evaporator (LT)  1 expansion valve (Blanco et al 2013a(Blanco et al , 2013b(Blanco et al , 2012 Water heating HT: 65°C MT: 30 to 45°C LT: -5 to 5°C 2 sinks 1 source  combined heating of space and hot water possible with higher efficiency  future perspective for monovalent heat pumps  high efficiency only for specific flow rates of heat source and sink …”

Section: Casmentioning

confidence: 99%

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Multi-temperature heat pumps: A literature review

Arpagaus

Bless

Schiffmann

et al. 2016

International Journal of Refrigeration

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Please cite this article as: Cordin Arpagaus, Frédéric Bless, Jürg Schiffmann, Stefan S. Bertsch, Multi-temperature heat pumps -A literature review, International Journal of Refrigeration (2016), http://dx.doi.org/Highlights (3-5 bullets, max. 85 characters including spaces):  A review on multi-temperature heat pumps and refrigeration systems is given.  Design strategies for multi-temperature heat pumps are presented.  Application examples in refrigeration, air-conditioning and heating are discussed.  First Law and Second Law efficiencies of the cycles are calculated based on thermodynamic models. AbstractThis review highlights the major advantages and challenges of mechanically driven heat pumps and refrigeration systems with focus on multi-temperature applications. Different design strategies are presented, including cycles with multi-stage compressors, ejectors, expansion valves, cascades, and separated gas coolers. Most multitemperature heat pump cycles use two heat sources and one heat sink. In supermarket applications, multi-stage compressor cycles with transcritical CO2 is an established key technology. Cascades with secondary loops are another frequently applied type of system. Expansion valve cycles are applied in household refrigeration and air conditioning. Cycles with ejectors seem to be a promising modification for system performance improvement. Separated gas coolers for space heating and hot water production have recently attracted attention due to the possible combination with supercritical CO2 cycles. Thermodynamic simulations reveal that multi-stage compressor cycles have the highest COPs and Second Law efficiencies, followed by cascade, ejector, and expansion valve cycles. The baseline cycle consisting of two single-stage heat pumps in parallel shows lower Second Law efficiency than the multi-stage compressor and cascade cycles, and higher efficiency than the ejector and expansion valve cycles.

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Section: Separated Gas Cooler Cyclesmentioning

confidence: 98%

Section: Casmentioning

confidence: 99%

Multi-temperature heat pumps: A literature review

Arpagaus

Bless

Schiffmann

et al. 2016

International Journal of Refrigeration

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“…Over time, computer simulations have proven to be a useful tool in optimizing the efficiency of cooling circuit with desuperheater in low-energy construction [15,17]. Computer simulations were also used to model the year-round operation of heat pumps with desuperheater for low energy houses in Japan [18].…”

Section: Introductionmentioning

confidence: 99%

Efficiency of Parallel Connected Desuperheater in a Cooling Circuit

Formánek

Horák

2023

Period. Polytech. Mech. Eng.

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Cooling circuits can be improved by using a desuperheater. A series connected desuperheater increases the efficiency of the circuit and allows the waste heat to be used, e.g., for DHW preparation. The study investigates the behavior of a parallel connected desuperheater for DHW preparation in an experimental cooling circuit. The basic parameters of the cooling circuit (efficiency, pressure, temperature and energy consumption) were evaluated when operating 1. with only a condenser and 2. with a condenser and a desuperheater connected in parallel. The results of the study show that a parallel connected condenser and desuperheater reduces the overall efficiency of the cooling circuit.

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“…However, their achievable coefficient of performance (COPs) are lower than that of the mechanical vapor compression heat pump cycle, which is widely used nowadays [4]. Therefore, a vapor compression heat pump system has high efficiency and is considered to be competitive to decrease energy consumption and thus reduce CO 2 emission [5,6]. Continuous efforts with regard to research on more efficient systems have mainly focused on viewpoints using alterative cycles [7][8][9][10] and the use of new refrigerants [7,11].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on a Vapor Injection Heat Pump System with a Single-Stage Compressor

et al. 2020

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In this study, a heat pump of 10 kW with vapor injection using refrigerant of R410A was developed. A vapor injection pipe connecting a gas–liquid separator at the outlet of the main expansion valve and the suction of a single-stage rotary compressor was designed. The heating performance of this vapor injection heat pump was investigated and analyzed at different compressor frequencies and primary temperatures. The experimental results show that for the heat pump without vapor injection, the heating capacity increased linearly with the compressor frequency, while the heating coefficient of performance (COP) decreased linearly with the compressor frequency for each tested primary temperature. The developed vapor injection technique is able to increase the heat pump system’s heating capacity and heating COP when the injection ratio R falls into the range 0.16–0.17. The refrigerant mass flow rate can be increased in the vapor injection heat pump cycle due to the decreased specific volume of the suction refrigerant. The power consumption of vapor injection heat pump cycle almost remains the same with that of the conventional heat pump cycle because of the increased refrigerant mass flow rate and the decreased compression ratio. Finally, it was found that the developed vapor injection cycle is preferable to decreasing the compressor’s discharge temperature.

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Impact of control schemes of a monovalent inverter-driven water-to-water heat pump with a desuperheater in continental and subtropical climates through simulation

Cited by 8 publications

References 17 publications

Multi-temperature heat pumps: A literature review

Multi-temperature heat pumps: A literature review

Efficiency of Parallel Connected Desuperheater in a Cooling Circuit

Experimental Investigation on a Vapor Injection Heat Pump System with a Single-Stage Compressor

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