Experimental and Numerical Investigations of Heat Regeneration Process Efficiency in a Heat Pump With a Mixture of Refrigerants

Sukhikh, A. A.; Antanenkova, I. S.; Кузнецов, В. Н.; Mereutsa, E.V.; Ereaihan,

doi:10.1615/interjenercleanenv.2017019186

Cited by 3 publications

(1 citation statement)

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“…CO 2 emissions were estimated at 17.48 kg/year for a collector with a 35‐year lifetime. A highly efficient heat pump working cycle was demonstrated by Sukhikh et al 22 Heat pump thermodynamic cycles use a variety of refrigerants, and their differences and advantages are discussed. Thermal testing of the plate heat exchanger was conducted.…”

Section: Introductionmentioning

confidence: 99%

Experimental comparison of solar drying based on evacuated tube collector with desiccant drying for dehydrating potato and ginger

Vyas,

Singh,

Agrawal

et al. 2024

Heat Trans

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In this article, a comparative study of different drying techniques, namely, open sun drying (OSD), desiccant drying, solar drying (SD), and solar drying with desiccant (SDWD) was done for drying potato and ginger. The thermal efficiency and air temperature differences of the solar dryer based on evacuated tube collectors were also examined. The average efficiency of the solar dryer was 29.01%. Average drying rates of OSD, desiccant drying, SD, and SDWD bed are 0.435, 0.435, 0.59, and 0.635 g/min. The moisture content of the potato was reduced from 79.6% to 32.9% by OSD, 32.6% by desiccant drying, 9.6% by SD, and 6.9% by SDWD. The moisture content of the ginger was reduced from its initial value of 82.3%–25.3% by OSD, 25% by desiccant drying, 10.1% by SD, and 3.2% by SDWD. SD assisted with a desiccant bed proved to be the best method for drying vegetables. Drying with desiccants is not feasible for drying in winter and spring seasons of the Indian climate.

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Section: Introductionmentioning

confidence: 99%

Experimental comparison of solar drying based on evacuated tube collector with desiccant drying for dehydrating potato and ginger

Vyas,

Singh,

Agrawal

et al. 2024

Heat Trans

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Installation of absorption refrigerating machines for the needs of conditioning of the Armada Mall

Sokolov

Sokolova

2021

IOP Conf. Ser.: Mater. Sci. Eng.

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The energy strategy of Russia for the period up to 2020 noted that in order to ensure energy security it is necessary to solve two priority issues: firstly, the modernization of the obsolete and physically worn out technological base of the fuel and energy complex using the best domestic and relevant foreign technologies for our conditions; secondly, it requires a change in the consumption pattern and distribution of production of fuel and energy resources. The work analyzed the state and considered the characteristics of the energy source. The concept of increasing the efficiency of the thermal power plant has been developed. As a result of analysis of existing plants for additional generation of cold from a more heated power generator, a scheme and theoretical cycle of absorption bromide of a lithium refrigerating machine is made. The results were obtained on the expected annual savings of the Armada Mall operating costs at the application of lithium refrigeration machine absorb bromide for the annual cold demand of 3,4 million kWh.

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Performance characteristics of a heat pump using renewable transcritical CO2 refrigerant for heating water

Yunus

Oreijah

2021

International Journal of Low-Carbon Technologies

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Among non-toxic and inflammable working fluids, carbon dioxide (CO2) proving a possible choice of refrigerant is gaining full status because of its reducing capacity of global warming and ozone depletion. Heat pump (HP) equipment uses energy more rationally to heat water by reducing emissions and global warming caused by conventional refrigerants. HP capability demands an environmentally friendly refrigerant for their full utilization and high energy saving as well to attaining higher coefficient of performance (COP) without much design corrections. CO2 is checked for sustainability to eliminate the standardized refrigerants such as chlorofluorocarbons (CFC) and hydro-CFC. In this work, the performance of CO2 as an alternate refrigerant in HP for heating water at different pressure, flow rates, evaporator fan speed and preheating have been investigated. HP is accommodated with two condensers. The results showed that the increased mass flow rate had increased COP, overall heat transfer (HT) coefficient (U) and HT. However, logarithmic mean temperature difference was decreased for increasing evaporator’s fan speed and pressure. The outlet water temperature (TWO) of second condenser increased with decreasing water flow rate. Improved COP, HT and TWO of HP are observed from the experimental evaluation in case of preheating of water.

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Experimental and Numerical Investigations of Heat Regeneration Process Efficiency in a Heat Pump With a Mixture of Refrigerants

Cited by 3 publications

References 0 publications

Experimental comparison of solar drying based on evacuated tube collector with desiccant drying for dehydrating potato and ginger

Experimental comparison of solar drying based on evacuated tube collector with desiccant drying for dehydrating potato and ginger

Installation of absorption refrigerating machines for the needs of conditioning of the Armada Mall

Performance characteristics of a heat pump using renewable transcritical CO2 refrigerant for heating water

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