EuroSun2008-2

Performance parameters

For any solar thermal system involving solar collectors, the efficiency of solar collectors will always be needed to observe its performance. Instantaneous efficiency of the collectors is defined as the ratio of useful energy absorbed by the working fluid to the amount of solar radiation falling on the collector.

image064

The Coefficient of Performance (COP) is used to describe the performance of a heat pump system. It is defined as the ratio of energy released in the condenser coil and water tank to energy used to run the compressor.

image065 Подпись: (5)

where Xpp is defined as:

3. Results and Discussion

The meteorological condition for the day during the experiment conducted in December is shown in Figure 2. It can be seen that the ambient temperature is relatively constant with a value close to 30 °C. The maximum solar radiation value reaches around 1000 W/m2, and it varies during the period of measurements with the lowest value around 400 W/m2

image067

Figure 2: Solar radiation and ambient temperature for a day in December

 

In Figure 3 it can be seen the evaporator collector efficiency tends to have a value of 80 to around 100 percent.

 

image068

Time

Figure 3: Variations of evaporator collector efficiency and ambient temperature with time

 

image069

Figure 4: Change of liquid collector efficiency and solar radiation with time

 

Подпись: Time Figure 5: Change of COP and ambient temperature with time

The efficiency of the liquid solar collector is shown in Figure 4. The collector, at 2 m2, has an efficiency in the range of 50 to 60 percent. As shown in Figure 5, the coefficient of performance (COP) tends to have a relatively stable value. It varies between 8 and 9.

From Figure 6, it can be seen that the maximum water production rate is close to 0.9 kg/hr. The performance ratio is a function of water production rate, thus the change of production rate will affect the performance ratio. From Figure 6, the performance ratio is shown to be close to 1.3.

Подпись:Подпись:Подпись:image074О

<1)

О

c

TO

E

о

t

<1)

CL

EuroSun2008-2

Validation of the library components

The validation of the models is necessary to ensure that the calculated results are valid. Furthermore it is to proof what differences consist due to the assumptions made in the …

Solar industrial process heat plants in operation

Data gathered in the framework of the IEA Task 33/IV include comprehensive information about the geographical distribution of the solar thermal plants, the industrial sectors addressed, the specific processes, the …

Experimental Investigations On Solar Driven Desalination Systems Using Membrane Distillation

J. Koschikowski*, M. Wieghaus*, M. Rommel*, Vicente Subiela Ortin**, Baltasar Penate Suarez**, Juana Rosa Betancort Rodriguez** * Fraunhofer Institute for Solar Energy Systems ISEHeidenhofstr.2,79110 Freiburg, GermanyTel +49-761-4588-5294Fax +49-761-4588-9000email ioako@ise. fhg. …

Как с нами связаться:

Украина:
г.Александрия
тел./факс +38 05235  77193 Бухгалтерия
+38 050 512 11 94 — гл. инженер-менеджер (продажи всего оборудования)

+38 050 457 13 30 — Рашид - продажи новинок
e-mail: msd@msd.com.ua
Схема проезда к производственному офису:
Схема проезда к МСД

Партнеры МСД

Контакты для заказов шлакоблочного оборудования:

+38 096 992 9559 Инна (вайбер, вацап, телеграм)
Эл. почта: inna@msd.com.ua