Reduction of electrical load for air conditioning by electronically controlled geothermal energy

Nardin, C. De; Fernandes, F. T.; Longo, Adriano J.; Cunha, Sergio Henrique Mioso; Lima, L. P.; Farret, Felix A.; Ferranti, E. M.

doi:10.1109/iecon.2013.6699413

Cited by 3 publications

(5 citation statements)

References 4 publications

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“…During the tests for this paper, the thermal accumulation in the soil showed great losses for longer periods, recovering only less than 20% of the energy deposited. The measurements were not consistent with the situations described in [8] and [9], requiring further tests of longer duration for more conclusive and definitive results. It is recommendable the use of some device to simulate a standart thermal dissipation in these tests.…”

Section: Discussionmentioning

confidence: 56%

“…In the heat recovery graphs, it can be noticed that there is an external influence with a periodic variation in the speed of heat gain that is consistent with the flow of incident solar radiation throughout the day. Attention should be paid to the fact that the tests were of short duration, with no occurrence of thermal saturation, as mentioned in [8] and [9].…”

Section: Discussionmentioning

confidence: 99%

“…In the tests carried out on the prototype discussed here, the hypothesis of acclimatization of a test room in the experimental geothermal house at CEESP-UFSM was considered, whose thermal load is 0.7 kW, with its maximum at 8:00 am in January [9]. It was found that the energy accumulated in any of the thermal accumulation scenarios was sufficient to meet the demand for thermal comfort during peak hours.…”

Section: Discussionmentioning

confidence: 99%

“…When thermoacccumulation is used during periods without heating the floor, the soil temperature increases as well as the efficiency of the process. The thermal energy naturally stored underground was used in a comparative study of climatization in Santa Maria, Brazil [9]. Two environments with identical construction and thermal characteristics, consisting of one air-conditioned of a conventional window-type air conditioner and the other one by a similar fan-coil type through which a flow of water from a horizontal geothermal exchanger passed.…”

Section: B Air Conditioning With Photovoltaic Energy and Thermal Accumulationmentioning

confidence: 99%

“…Considering that the demand for cooling is greater for the geothermal experimental house [9], the process of thermal exchange was that of cooling the soil. Three successful soilheat exchange operations were carried out with increasing cooling time.…”

Section: B Analysis Of Thermal Pulses In a Geothermal Exchangermentioning

confidence: 99%

See 4 more Smart Citations

Use of Geothermal Exchangers for Thermoaccumulation of the Energy Generated by Climatizers Activated by Photovoltaic Sources

Pires¹,

Farret²,

Gonzatti³

2021

Proceedings of the 13th Seminar on Power Electronics and Control (SEPOC 2021)

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The use of air conditioning is growing up very much in Brazil and in the world in general. That is no longer a luxury, but a necessity, though they have heavy impacts on the consumption of electricity. The alignment between the peak thermal load and the highest solar incidence of solar energy leads the scientific community to search for machines powered by this type of energy. Energy costs are higher when the solar energy is decreasing so recommending a more powerful storage of energy. Regarding this point of view, soil is one of the oldest, universal and most extensive form of thermal energy storage. This paper shows how thermal energy storage can be used to provide air conditioning at very low costs. A simple technology is dicussed showing that it is possible to store energy underground and recover it in a very efficient way to provide thermal comfort.

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Section: Discussionmentioning

confidence: 56%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: B Air Conditioning With Photovoltaic Energy and Thermal Accumulationmentioning

confidence: 99%

Section: B Analysis Of Thermal Pulses In a Geothermal Exchangermentioning

confidence: 99%

See 3 more Smart Citations

Use of Geothermal Exchangers for Thermoaccumulation of the Energy Generated by Climatizers Activated by Photovoltaic Sources

Pires¹,

Farret²,

Gonzatti³

2021

Proceedings of the 13th Seminar on Power Electronics and Control (SEPOC 2021)

View full text Add to dashboard Cite

show abstract

Surface geothermal energy applied to low cost and low power consumption residential air conditioning

Nardin

Fernandes

Farret

et al. 2016

IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society

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Increasing Efficiency in the Extraction of Solar Heat Stored Underground With Perturb-and-Observe Control

Nardin¹,

Fernandes²,

Longo³

et al. 2016

Journal of Solar Energy Engineering

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This paper describes a perturb-and-observe (P&O) control aiming to increase the heat exchange between solar heat stored underground and the ambient of a single conditioned room without any heat pump. This P&O control increases or decreases the water flow rate through an underground hosepipe heat exchanger. With this purpose, two power converters were used to activate, respectively, a low power water pump and a fan coil so as to keep the room within the limits of a reference temperature range (between 18 °C and 24 °C). Outside these limits, the P&O control searches for the best heat exchange between the ambient room and the underground soil and, when inside these limits, the water pump and fan coil are turned off. Two identical experimental rooms, referred in this study as “reference” and “test” rooms, had their temperatures measured every 1-min during winter and summer. For comparison purposes, the reference room was left at its natural conditions without any air conditioning. The experimental results show a remarkable improvement in the heat exchange and a considerable reduction in power demand when using the P&O control. As a result, it was obtained an energy saving of approximately 45% in one summer day and 22% in one winter day. It is important to point out that this paper refers, strictly, to the description of a P&O control for heat exchange systems involving solar heat stored underground in a single room.

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Reduction of electrical load for air conditioning by electronically controlled geothermal energy

Cited by 3 publications

References 4 publications

Use of Geothermal Exchangers for Thermoaccumulation of the Energy Generated by Climatizers Activated by Photovoltaic Sources

Use of Geothermal Exchangers for Thermoaccumulation of the Energy Generated by Climatizers Activated by Photovoltaic Sources

Surface geothermal energy applied to low cost and low power consumption residential air conditioning

Increasing Efficiency in the Extraction of Solar Heat Stored Underground With Perturb-and-Observe Control

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