**5. Result and discussion**

In this section we discuss the demanded thermal load, fraction of the load, supplied by the solar energy system for various collector zones and parametric researches.

**Figure 5** shows that the chart of monthly values from correction factor by means of F-diagram method shows that the heating extent, monthly average daily temperature and direct solar radiation lower dependent on the weather conditions.

It is clearly seen from **Figure 6** that changed correction factor Yc/Y from environmental temperature has an exponential function, which according to a correction factor, increases the annual fraction of the load, provided by the solar energy.

It can be seen from **Figure 7** that the monthly load fraction increases along with the increase of a collector square. It also shows that the monthly fraction is higher in

summer months in Almaty city (Kazakhstan) (July—the highest value) and lower

*F-diagram Research Method for Double Circuit Solar System with Thermosyphon Circulation*

In **Figure 8** it is observed that the lowest heating load is in the summer months of the year. It is the time, within which the need in heating load is minimal. This figure also denotes that the load for buildings heating is accessible only within 3 months, namely, in December, January and February. In the remaining time the load for heating also equals to zero. It is a very interesting result due to the fact that the load corresponds to the winter peak demand, during which the load for buildings heating is necessary, and the result thereof also provides important advantage from economic point of view at the expense of fuel-electricity total cost reduction that, otherwise, could be spent for the energy, necessary for heat supply, required

**Figure 9** shows that the annual load fraction increases for a little and the biggest

fraction is in the collector's larger square. In particular, if the storage capacity exceeds approximately 50 l of water per m<sup>2</sup> of collector's square, there is only the insufficient increase (upgrading) in the annual load fraction, provided with the

*Change of premises and hot water heating load depending on the month of the year.*

*Influence of actual storage capacity in liter to m2 of collector's square per the annual load fraction, provided*

in winter months (January, February—the lowest value).

*DOI: http://dx.doi.org/10.5772/intechopen.88045*

in winter period.

solar energy.

**Figure 8.**

**Figure 9.**

**61**

*with the solar energy.*

**Figure 5.** *Dependence of monthly values on correction factor for hot water supply systems.*

**Figure 6.** *Dependence of monthly values on the altered correction coefficient Yc/Y for hot water supply systems.*

**Figure 7.**

*Dependence of monthly load fraction change on collector's different squares within a year for hot water supply systems.*

*F-diagram Research Method for Double Circuit Solar System with Thermosyphon Circulation DOI: http://dx.doi.org/10.5772/intechopen.88045*

summer months in Almaty city (Kazakhstan) (July—the highest value) and lower in winter months (January, February—the lowest value).

In **Figure 8** it is observed that the lowest heating load is in the summer months of the year. It is the time, within which the need in heating load is minimal. This figure also denotes that the load for buildings heating is accessible only within 3 months, namely, in December, January and February. In the remaining time the load for heating also equals to zero. It is a very interesting result due to the fact that the load corresponds to the winter peak demand, during which the load for buildings heating is necessary, and the result thereof also provides important advantage from economic point of view at the expense of fuel-electricity total cost reduction that, otherwise, could be spent for the energy, necessary for heat supply, required in winter period.

**Figure 9** shows that the annual load fraction increases for a little and the biggest fraction is in the collector's larger square. In particular, if the storage capacity exceeds approximately 50 l of water per m<sup>2</sup> of collector's square, there is only the insufficient increase (upgrading) in the annual load fraction, provided with the solar energy.

**Figure 8.** *Change of premises and hot water heating load depending on the month of the year.*

#### **Figure 9.**

*Influence of actual storage capacity in liter to m2 of collector's square per the annual load fraction, provided with the solar energy.*

**Figure 5.**

**Figure 6.**

**Figure 7.**

*systems.*

**60**

*Dependence of monthly values on correction factor for hot water supply systems.*

*Thermodynamics and Energy Engineering*

*Dependence of monthly values on the altered correction coefficient Yc/Y for hot water supply systems.*

*Dependence of monthly load fraction change on collector's different squares within a year for hot water supply*
