Performance characteristics of integral type solar-assisted heat pump

Huang, Bin‐Juine; Chyng, J.P.

doi:10.1016/s0038-092x(01)00076-7

Cited by 113 publications

(46 citation statements)

References 5 publications

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“…The concept of DX-samp was first considered by Sporn and Ambrose (1955) in West Virginia. Following the same line work, many theoretical and experimental studies have been reported (Chaturvedi et al, 1982;Morgan, 1982;O'Dell et al, 1984;Chaturvedi and James Shen, 1984;Chaturvedi and Abazeri, 1987;Morrison, 1994;Chaturvedi et al, 1998;Axaopoulos et al, 1998;Hawlader et al, 2001;Huang and Chyng, 2001). A review on such field of work has indicated that the COP values of the DX-SAHP systems range from 2 to 9 and the collector efficiencies vary between 40 and 75% under different climatic conditions, experimentally.…”

Section: Introductionmentioning

confidence: 92%

Study on a direct-expansion solar-assisted heat pump water heating system

Kuang

Sumathy

Wang

2003

Int. J. Energy Res.

122

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SUMMARYAnalytical and experimental studies were performed on a direct-expansion solar-assisted heat pump (DX-SAHP) water heating system, in which a 2 m 2 bare flat collector acts as a source as well as an evaporator for the refrigerant. A simulation model was developed to predict the long-term thermal performance of the system approximately. The monthly averaged COP was found to vary between 4 and 6, while the collector efficiency ranged from 40 to 60%. The simulated results were used to obtain an optimum design of the system and to determinate a proper strategy for system operating control. The effect of various parameters, including solar insolation, ambient temperature, collector area, storage volume and speed of compressor, had been investigated on the thermal performance of the DX-SAHP system, and the results had indicated that the system performance is governed strongly by the change of solar insolation, collector area and speed of compressor. The experimental results obtained under winter climate conditions were shown to agree reasonably with the computer simulation.

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Section: Introductionmentioning

confidence: 92%

Study on a direct-expansion solar-assisted heat pump water heating system

Kuang

Sumathy

Wang

2003

Int. J. Energy Res.

122

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“…Many Authors indeed, e.g. [28,29], stress the feature of collecting energy not only from solar irradiation but also from the environment and ambient air (including humidity condensation).…”

Section: Resultsmentioning

confidence: 99%

Integrated solar-assisted heat pumps for water heating coupled to gas burners; control criteria for dynamic operation

Scarpa¹,

Tagliafico²,

Tagliafico³

2011

Applied Thermal Engineering

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A direct expansion integrated solar assisted heat pump (ISAHP) is compared to a traditional flat plate solar panel for low temperature (45 °C) water heating applications. The (simulated) comparison is accomplished assuming both the devices are energy supplemented with an auxiliary standard gas burner, to provide the typical heat duty of a four-member family. Literature dynamical models of the systems involved have been used to calculate the main performance figures in a context of actual climatic conditions and typical stochastic user demand.The paper highlights new heat pump control concepts, needed when maximum energy savings are the main goal of the apparatus for given user demand. Simulations confirm the high collector efficiency of the ISAHP when its panel/evaporator works at temperature close to the ambient one. The device, with respect to a flat plate solar water heater, shows a doubled performance, so that it can do the same task just using an unglazed panel with roughly half of the surface.

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“…There have been some research studies conducted on the integration of solar, geothermal energy, utilized heat refrigeration units, conditioned air, as well as the selection of working uids for heat pump, including carbon dioxide, which refers to natural and environmentally-friendly refrigerants, since it does not deplete the ozone layer [15]. At the same time, the amount of absorbed solar energy was increased by 48% [16]. The closest analog integrated use of renewable energy is a waterring system, where all the low-potential and potential powers, regardless of their purpose at the moment (heating or cooling), are joined together with two-pipe low-temperature water network [17].…”

Section: State Of the Problemmentioning

confidence: 99%

Integrated system for the use of solar energy in the animal farm

et al. 2017

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Abstract. The advent of unique technologies of the developing Solar Energy (SE), actual energy, faces economic and environmental problems. The main obstacle to the widespread use of SE is the low value of the average annual e ciency of known solar installations. In a sharply continental climate, they are exploited only in the warm season, about 6-7 months. Known combined systems, where additional conventional water heaters duplicate the operation of solar units, require additional costs for energy carriers. These disadvantages are not o ered by the integrated system of SE use. In the article, the system was studied using the example of a cattle-breeding farm. The new system performs these functions; it recycles heat, organizes their movement and accumulation, and smooths out the uneven SE. The main components of the system are: Solar Power Plant (SPP), milk cooler, climate unit, Heat Pump (HP), the battery heat, automatic control system, and device heating and hot water. The main goal, i.e. lower cost of the energy produced and the elimination of the uneven SE, compared to the known SPP, is achieved through the ow of energy from the sources mentioned above.

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Performance characteristics of integral type solar-assisted heat pump

Cited by 113 publications

References 5 publications

Study on a direct-expansion solar-assisted heat pump water heating system

Study on a direct-expansion solar-assisted heat pump water heating system

Integrated solar-assisted heat pumps for water heating coupled to gas burners; control criteria for dynamic operation

Integrated system for the use of solar energy in the animal farm

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