» Economy

Below we introduce a simple example for single-family home design dedicatet to 4, 5 and 7 persons

inhabitant	4	5	7
collectors	2	3	4
installation cost [PLN]	6 852^*	8 671^*	11 913^*
demand [kWh/rok]	4386	5458	7608
power thermal of collectors [kWh/rok]	1769	2487	3426
enrgy saving [kWh/rok]	2711	3812	5258
gas saving [m³/rok]	271	381	526
reduction CO₂ [kg/rok]	515	724	999

^*data^03.11.2008

We performed analysis of reimbursement for two case:

Lp	inhabitant	expenditures [PLN]	saving/year			recovery time[year]
Lp	inhabitant	expenditures [PLN]	gas[m3]	electric current [kWh]	fuel oil [l]	gas[m3]	electric current [ kWh]	fuel oil[l]
1	5 persons	8 671^*	381	2512	353	9,8	6,5	7,5
2	8 persons	13 786^*	626	4162	583	9,6	6,4	7,2

^*data^03.11.2008

In the calculation on investment we were taken intoaccount the 5% increase in the price of conventional fuels and energy.

It should be noted that the operating costs of such a system are very small (periodic pump is about 60-100W), and the viability of solar collectors is about 30years.

High-collectors and adapted to their heating systemmakes it possible economic use of solar energy, andafter taking into account the continuous and unavoidableincreases in fuel prices, the investment in solar installation will prove successful and profitableinvestment.