An improved solar dryer with enhanced efficiency of drying

A drying efficiency, solar collector technology, applied in the field of improved solar dryers, which can solve the problems not mentioned, not suitable for drying all food products, low temperature, etc.

Inactive Publication Date: 2014-08-27
COUNCIL OF SCI & IND RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of this system is that the temperatures achievable with this type of structure are very low (60°C), making it unsuitable for drying all food products
The main disadvantage of this system is that the position of the dryer needs to be constantly monitored to adjust the tracking mechanism
There is also no mention of the use of a single low power PV panel to control multiple functions such as operation of fans whose speed is synchronized with insolation, operation of humidity controllers and solenoid valves for exhausting / recirculating dryer outlet air, and drying automatic tracking of the device (if applicable)

Method used

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  • An improved solar dryer with enhanced efficiency of drying
  • An improved solar dryer with enhanced efficiency of drying
  • An improved solar dryer with enhanced efficiency of drying

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0098]selected in a situation Figure 1-Figure 7 The solar drier in the one does not have any reflector, in the other case there is a reflector on the collector side. Measurements were taken under nearly identical ambient conditions on two typical days in March, and dry air temperatures recorded from 11 am to 4:30 pm are listed in Table 1.

[0099] Table 1: Drying air temperature distribution inside the unit with and without reflectors

[0100]

[0101]

[0102] This example tells us that using reflectors on the collector side improves the dry air temperature distribution over the day.

example 2

[0104] The DC fan runs directly using 10 watt solar PV panels. The table below shows the fan speed in r.p.m as measured by the tachometer based on the variation in sun intensity for that particular day. Because the wind turbines are powered by solar PV panels, as the sun's intensity increases, the power output from the panels increases, which increases the speed of the wind turbines. Data was collected without a reflector on the dry chamber.

[0105] Table 2: Variation of fan speed with solar intensity and calculated mass flow of air inside the dryer

[0106] time (h)

[0107] 14:00

[0108] This example tells us that the fans are also running at very high speeds during peak insolation. This effect is beneficial for the drying process as it helps to control the temperature inside the drying chamber so that during times of high solar insolation the increased wind flow within the unit does not reach very high stagnation temperatures. This can be verified w...

example 3

[0110] The experiments in Example 2 were repeated on two similar solar dryers. In one case, the fan speed was fixed at 2700 rpm, while in the other case, the fan speed was varied with solar insolation. In the table below, for the two cases, the collector outlet temperature T co (°C) are plotted as a function of time of day.

[0111]

[0112] The above example tells us that when the fan speed is fixed, T co varies from 62.1°C to 90°C, and by using a fan directly connected to the PV panel, T co is better controlled and is in the range of 72.3°C to 83.2°C.

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PUM

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Abstract

The present invention provides an improved solar dryer with improved. The dryer consists of a solar absorber / collector (9) and a drying chamber (6). One end of the collector is connected to a forced draft fan (10) and the other end connects the drying chamber. The drying chamber has a drawer in which the material to be dried is kept on a wire mesh. The dryer further has the provision for placing color indicative silica gel under the wire mesh when operated in recirculation mode. The other end of the drying chamber has an induced draft fan (11). Both the dc fans operate using a 10 watt photovoltaic panel (3). V- trough reflectors (4,5,7,8) made from anodized aluminum are fixed on the collector and optionally on the drying chamber. A tracking circuit is incorporated to auto -track the dryer. A locking mechanism (14) is also incorporated to help the unit withstand high wind load. The dryer further has the provision of programmable recirculation of the spent air from drying chamber once its humidity drops below a pre -set value which process helps to speed up the rate of drying.

Description

technical field [0001] The present invention relates to an improved solar dryer with increased drying efficiency. In particular, the present invention relates to an improved solar dryer that improves the incidence of solar radiation on the collector through a combination of alignment / tracking with appropriate use of reflectors. More specifically, the present invention relates to achieving relatively more uniform drying air temperatures during insolation periods of the day by increasing the efficiency of heat transfer from heat absorbing panels to the flowing air and by increasing the use of heated air through proper recirculation Efficiency is achieved thereby increasing the overall efficiency of the dryer. Background technique [0002] Can refer to the article "Review of solar dryers for agricultural and marine products ( A review of solar dryers for agricultural and aquatic products). This article is a review of the different types of solar dryers in terms of the produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B3/28F26B21/04F26B21/08
CPCF24J2/5406Y02E10/47Y02B40/74Y02E10/44F26B21/04F24J2/20F24J2/16F24J2/0015F26B21/083F26B3/28F26B3/286F24S30/422F24S20/25F24S10/50F24S23/77Y02B40/18Y02E10/40
Inventor P·K·高希S·迈蒂P·A·佩泰尔J·N·巴拉迪亚S·S·肖汉M·L·桑加尼P·V·帕玛K·埃斯瓦兰P·V·阿格拉瓦特
Owner COUNCIL OF SCI & IND RES
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