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A digital thermometer is an instrument used to automatically
measure the temperature of a substance or the surroundings. In this
project a multiscale digital thermometer was designed. In our
design there was three main parts 1. Sensor 2. Microcontroller 3.
LCD display parts. A DC voltage was developed at the output of the
sensor (LM35) depending on the temperature of the body to be
measured. For an increase of every 1 degree centigrade of
temperature an increase of 10mv voltage at the sensor output was
found. We could measure the magnitude of temperature ranging from 0
to 102 degree centigrade with this thermometer and the
corresponding sensor voltage output was found to be in the range of
0-1 volt. The sensor output was connected to the microcontroller
input. The measured value of the temperature was displayed through
an LCD display in the unit of Fahrenheit, Centigrade and Kelvin.
The whole set up was mounted on a breadboard and every section of
the circuit was tested individually. After getting satisfactory
result every section was jointed. The response time of the
thermometer was found to be of maximum 15 seconds. The total cost
of the project was BDT-800/- only.
A wireless multimeter is an instrument used to measure the current,
voltage, frequency and apparent power at a load from a distance. In
this project a wireless multimeter was designed which consisted of
two major parts: 1) Measuring Section Module and 2) Remote Display
Module. Measuring Section Module consisted of three major section
which are i) signal input, ii) Micro controller, iii) RF
transmitter whereas the remote display module also consisted of
three parts i) RF Receiver, ii) Microcontroller and iii) LCD
Display Module. After all relevant calculations the dc voltage
produced by the micro controller was sent through an RF Frequency
transmitter module having an omnidirectional antenna. The RF
receiver module situated at a maximum distance of 150 meters from
the transmitter, received the transmitted data. The result is then
displayed through a 16-bit LCD display module. This multimeter was
found to measure the values of the voltage, current, power and
frequency ranging from (0-250)V, (0-20)A, (0-5000)VA and (0-125)KHz
respectively. The main attraction of our designed circuit was the
simplicity of the circuit, easiness of implementation and the
availability of components.
The main purpose of this project is to design an inverter that will
enable the inversion of a DC power source, supplied by Photovoltaic
(PV) Cells, to an AC power source that will be either used to
supply a load or connected directly to the utility grid. The
benefit of this project is to give access to an everlasting and
pollution free source of energy. The future is looking towards
alternative power sources all of which will need to be regulated in
one form or another. To make this possible, a highly efficient low
cost product will have to be designed. Among all the different
converter designs only a few are capable of providing high power
with high efficiency. This will be tested experimentally, first by
computer simulation, and then in the laboratory Implementation.
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Solar Energy (Paperback)
Mohammad Arif Sobhan Bhuiyan, M. A. S. Bhuiyan
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R1,280
Discovery Miles 12 800
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Ships in 10 - 15 working days
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Solar radiation data are essential to the works of energy planners,
engineers, environmental and agricultural scientists. But the
measured radiation data for a long period are not available all
over Bangladesh. However, Bangladesh Meteorological Department has
been recording different climatological parameters for years
together throughout the country. Computation of solar radiation may
be done using these meteorological parameters. For this purpose, we
used theoretical formula proposed by different authors in
literature. Monthly average data on sunshine duration (n), day
length (N), relative humidity (R), temperature (T) etc. for a
period of 28 years between 1980 and 2007 are used. So, this study
is carried out to determine empirically global, diffuse and direct
solar radiation on a horizontal surface for ten districts uniformly
distributed all over Bangladesh (latitude 20o34 N - 26o34 N and
longitude 88o01 E - 92o41 E) as well as to predict correlations for
them.
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