Annual Performance of a Modified Greenhouse Dryer Under Passive Mode In No-Load Conditions

An experimental investigation has been carried out on the modified greenhouse dryer with insulated north wall operating under natural convection mode of heat transfer for different floor conditions, namely ground floor, concrete floor, gravel floor, and black painted gravel floor. The terms like coefficient of diffusivity, coefficient of performance, overall heat transfer coefficient, heat loss factor, and heat utilization factor has been calculated for different floor conditions. The maximum difference between room temperature and ambient temperature was found to be 32.4°C at 13 O'clock for black painted gravel floor, followed by gravel floor, concrete floor, and ground floor which are 27, 14.1, and 11.5°C, respectively. It has been observed that the rise in the percentage of maximum room temperature in comparison to maximum ambient temperature for black painted gravel floor, gravel floor, concrete floor, and the ground floor was 50.31, 46.15, 30.1, and 26.6%, respectively at 13 O'clock. It has been found that the maximum temperature absorbed by black painted gravel bed. Hence, this type of floor condition is highly recommended for drying of low and medium moisture content type vegetables and fruits. The thermal parameters of the result obtain from the present setup was compared with the published literature, and it was found that all parameters show the similar trends; however, the present setup shows the superior performance compared to other research work.

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“…Evaporative loss is used to determine the moisture content available in the crop; it can be evaluated as shown in Equation :

h_{evp} = 0.016 h_{can} ([], \frac{P (T_{tr}) - γP (T_{rm})}{T_{tr} - T_{rm}})

where h evp (evaporative loss) is neglected in no‐load condition …”

Section: Numerical Computationcontrasting

confidence: 49%

Thermal analysis of north wall insulated greenhouse dryer at different bed conditions operating under natural convection mode

Ahmad

Prakash

2019

Env Prog and Sustain Energy

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“…The increased temperature inside the NWIGHD will help the system for faster rate of moisture removal process. The difference of inside room air temperature of NWIGHD and modified greenhouse dryer is 2.8°C which is 14% higher than the modified greenhouse dryer (Prakash and Kumar, 2015).…”

Section: Role Of Ambient Temperature and Solar Radiation On Greenhousmentioning

confidence: 98%

“…The sum of loss factor through the canopy and vent is assumed as 1. With the help of this assumption, the coefficient of diffusion can be written as Prakash and Kumar (2015), Prakash and Kumar (2014b) and Barnwal and Tiwari (2008):…”

Section: Coefficient Of Diffusivitymentioning

confidence: 99%

“…The rate of instantaneous thermal loss efficiency factor through canopy which is an indirect loss factor can be calculated as Prakash and Kumar (2014c), Prakash and Kumar (2015) and Prakash and Kumar (2014b):…”

Section: Coefficient Of Diffusivitymentioning

confidence: 99%

“…A significant interest among researchers has been observed in the field of greenhouse drying for designing, development and testing of different kind of greenhouse dryers. The review revealed that the greenhouse effect can also be used for low and medium temperature drying application inside the greenhouse dryer accepting its other application, like plant soil solarisation cultivation, aquaculture and poultry (Prakash et al, 2013;Kumar et al, 2014;Prakash and Kumar, 2015). For small-scale greenhouse dryer, losses of incident solar radiation through the north wall is a major problem and so as to make the greenhouse more effective than previous designs, the losses through the north wall is to be eliminated.…”

Section: Introductionmentioning

confidence: 96%

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Performance analysis of greenhouse dryer by using insulated north-wall under natural convection mode

Chauhan

Kumar

2016

Energy Reports

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a b s t r a c tA prototype north wall insulated greenhouse dryer has been fabricated and tested in no-load conditions under natural convection mode. Experimentation has been conducted in two different cases. Case-I is when solar collector placed inside the dryer and Case-II is North wall insulated greenhouse dryer without solar collector. Coefficient of performance, heat utilisation factor, convective heat transfer coefficient and coefficient of diffusivity have been evaluated in thermal performance analysis. The difference of the highest convective heat transfer coefficient of both cases is 29.094 W/m 2°C which is showing the effectiveness of insulated north wall and solar collector. The maximum coefficient of diffusivity (0.0827) was achieved during the third day of experiment in Case-II. The inside room temperature of wall insulated greenhouse dryer for Case-I is 4.11%, 5.08 % and 11.61 % higher than the Case-II during the day 1, day 2 and day 3 respectively. This result is also showing the effectiveness of solar collector and insulated north wall. The highest heat utilisation factor (0.616) is obtained during the second day for Case-I while for Case-II it is 0.769 during the third day of experimentation. Maximum coefficient of performance achieved is 0.892 during the third day of the experiment for Case-I whereas 0.953 is obtained on the first day of experimentation for Case-II.

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Environmental and economic sustainability of PVT drying system: A heat transfer approach

Tiwari

Sahdev

Kumar

et al. 2020

Env Prog and Sustain Energy

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Present communication is an attempt to explore the best PV technology suitable for PVT solar drying system through environmental and economic feasibility. Experimental setup for one of the PV technology (c‐Si) has been taken for experimental validation with theoretical model. Further, the environmental feasibility and environ economic evaluation for drying system having roof with various PV namely, c‐Si, p‐Si or m‐Si, a‐Si, CdTe, and CIGS have been evaluated through energy matrices (EPBT, EPF, and LCCE), CO2 emission, net CO2 mitigation and carbon credit earned which is based on energy and exergy output of the system on yearly basis. The economic analysis has been carried out with experimental data taken on c‐Si PVT drying system by considering grapes as a crop. Cogeneration efficiency has been calculated for different PV technologies and found to be highest for c‐Si PV technology that is, 61.71%, 77.98%, and 12.25% based on energy (electrical and thermal) gain, equivalent (overall) energy gain, and exergy gain, respectively. LCCE on energy basis reveals that for the five‐year system life, c‐Si and CIGS have equal efficiency but after five years, c‐Si is best. Cogeneration efficiency of system on the basis of energy (electrical + thermal) gain, equivalent (overall) energy gain and overall exergy gain found to be maximum with c‐Si PV technology that is, 61.71%, 77.98%, and 12.25%, respectively.

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Annual Performance of a Modified Greenhouse Dryer Under Passive Mode In No-Load Conditions

Cited by 39 publications

References 28 publications

Thermal analysis of north wall insulated greenhouse dryer at different bed conditions operating under natural convection mode

Thermal analysis of north wall insulated greenhouse dryer at different bed conditions operating under natural convection mode

Performance analysis of greenhouse dryer by using insulated north-wall under natural convection mode

Environmental and economic sustainability of PVT drying system: A heat transfer approach

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