Thermal modelling and experimental validation of ground temperature distribution in greenhouse

Ghosal, M. K.; Tiwari, Garima; Srivastava, Nimisha; Sodha, M. S.

doi:10.1002/er.950

Cited by 22 publications

(8 citation statements)

References 14 publications

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“…Table 1. Distribution of temperature under the ground (a) [43], (b) [44], (c) [45], (d) [46]. In Guangzhou, South China, the monthly average temperature variation was investigated by Wen et.al [21] and it was verified that the gradual variation of the basement temperature increased with increase in depth.…”

Section: Subsoil Temperature and Impact Of Surface Propertiesmentioning

confidence: 99%

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Development of Passive Energy Source as Earth Air Pipe Heat Exchangers (Eaphe) System - A Review

Verma

Bansal

Rana

2020

Journal of Thermal Engineering

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Diversity in living standards and population growth leads to increased global energy consumption. Human comfort always plays a vital role in using different means to reduce the effects of weather conditions. The building sector captures approximately 40% of the global energy and it is most commonly used for cooling and for heating of the space occupied due to the use of appliances such as room heaters or air coolers, air conditioners, etc. The use of these appliances contributes significantly to global warming, which is a very serious environmental problem. Passive energy sources are used widely to reduce the consumption of energy due to heating and cooling of the building. Earth air pipe heat exchanger is one of the passive cooling/ heating technology used for the indoor thermal comfort of the occupants. In this review article, various discussion has been done on the use of passive energy explained by the earth air pipe heat exchanger and various investigations conducted by authors under different conditions and parameters like air velocity, pipe depth, pipe length, etc. that the thermal conductivity of the soil is the key point to the efficient operation of the earth air pipe heat exchanger system and it is also necessary to maintain the thermal conductivity of the soil in the vicinity of the pipe in order to achieve better performance in operation.

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Section: Subsoil Temperature and Impact Of Surface Propertiesmentioning

confidence: 99%

“…In order to investigate the subsoil temperature with respect to the depth various experimental and numerical studies were performed [8,20,44,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60]. Some of the studies investigated Journal of Thermal Engineering, Review Article, Vol.…”

Section: Subsoil Temperature and Impact Of Surface Propertiesmentioning

confidence: 99%

Development of Passive Energy Source as Earth Air Pipe Heat Exchangers (Eaphe) System - A Review

Verma

Bansal

Rana

2020

Journal of Thermal Engineering

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“…In order to minimize the energy produced by fossil fuel, the introduction of devices based on renewable sources such as geothermal heat pumps represent the first step to decreasing harmful emissions [28,29]. Heating/cooling systems affect, significantly, the growth, the quality and the cultivation time in greenhouses [30]. In particular, the indoor environmental parameters in a greenhouse must be monitored and controlled to support crop growth [31].…”

Section: Smart Greenhouses Applicationsmentioning

confidence: 99%

Model Predictive Control versus Traditional Relay Control in a High Energy Efficiency Greenhouse

et al. 2021

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The sustainable agriculture cultivation in greenhouses is constantly evolving thanks to new technologies and methodologies able to improve the crop yield and to solve the common concerns which occur in protected environments. In this paper, an MPC-based control system has been realized in order to control the indoor air temperature in a high efficiency greenhouse. The main objective is to determine the optimal control signals related to the water mass flow rate supplied by a heat pump. The MPC model allows a predefined temperature profile to be tracked with an energy saving approach. The MPC has been implemented as a multiobjective optimization model that takes into account the dynamic behavior of the greenhouse in terms of energy and mass balances. The energy supply is provided by a ground coupled heat pump (GCHP) and by the solar radiation while the energy losses related to heat transfers across the glazed envelope. The proposed MPC method was applied in a smart innovative greenhouse located in Italy, and its performances were compared with a traditional reactive control method in terms of deviation of the indoor temperature in respect to the desired one and in terms of electric power consumption. The results demonstrated that, for a time horizon of 20 h, in a greenhouse with dimensions 15.3 and 9.9 m and an average height of 4.5 m, the proposed MPC approach saved about 30% in electric power compared with a relay control, guaranteeing a consistent and reliable temperature profile in respect to the predefined tracked one.

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“…An effort has been made to study the effect of various greenhouse design parameters on the conservation of energy for environmental control using a mathematical model of a greenhouse thermal environment (Tiwari et al, 2002Din et al, 2003;Jain and Tiwari, 2003;K . o orner and Challa, 2003;Ghosal et al, 2004; . O Ozt .…”

Section: Introductionmentioning

confidence: 97%

Experimental determination of the overall heat loss coefficient for energy requirement of greenhouse heating

Öztürk

2005

Int. J. Energy Res.

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SUMMARYThis paper presents an experimental determination of energy requirement for greenhouse heating. The overall heat loss coefficient, heat input, the control factor for air-tightness, the rate of heat loss and the thermal screen effectiveness were calculated. The relationships between the overall heat loss coefficient and the wind speed, and the outside temperature were modelled, including the measured and calculated values. It was found that the thermal screen effectiveness was 16 and 19.8% for the polyethylene (PE) and polyester screens, respectively.

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Thermal modelling and experimental validation of ground temperature distribution in greenhouse

Cited by 22 publications

References 14 publications

Development of Passive Energy Source as Earth Air Pipe Heat Exchangers (Eaphe) System - A Review

Development of Passive Energy Source as Earth Air Pipe Heat Exchangers (Eaphe) System - A Review

Model Predictive Control versus Traditional Relay Control in a High Energy Efficiency Greenhouse

Experimental determination of the overall heat loss coefficient for energy requirement of greenhouse heating

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