Bakhtiyar Balzhan Torepashkyzy Candidate of Technical Sciences, senior teacher of AUES

Flat plastic collectors of heating

Solar collectors for heating of rooms and for hot water supply, work at renewables, using thus inexhaustible solar energy. Systems of solar heat supply with the duplicating heat source (doubler) and compulsory circulation of the heat carrier for providing GVS occupy a considerable segment of the modern market of solar technology, and we will discuss a task in relation to this type of systems here. We formalize a task. There is an outdoor pool with "mirror" 10kh5m, and average depth equal 1.8m. The duplicating heater isn't used, heating of water is made only by solar energy, in particular the pool heats up the sun "directly". Seasonal use of the pool is carried out from the middle of May to the middle of September, the pool is filled before a season and its surface is open day and night. Varying the area of absorbers we define by means of T-sol effect of work of collectors counting average water temperature in the pool in the cold and heat month. We will pay attention that thermal schemes for the plastic and glazed flat collectors differ and it is reflected in Figure A and in calculations. The received results are presented in the form of schedules in Figure B.

Figure 1. Standard schemes of solar power plants the offered

Schedules which are shown in the form of thick lines, reflect average monthly water temperature in the pool in May and in July depending on the area of the involved plastic collectors (type A). The same dependences are given by thin lines for the flat glazed collectors (type B). According to the received results temperature in the pool can get warm in July independently to high temperature without application of collectors (in this case high value is received as the speed of a wind was =0). Maintenance of the maximum temperature in July, will be obviously connected with the periodic shutdown of system of heating provided with automatic equipment therefore, anyway, actually to make comparison of systems on the minimum temperature in May. Let this temperature be equal 22 degrees. We will carry out a conditional isotherm of X1 and we will receive a ratio of the areas 1.458/1, respectively, for the plastic and glazed collectors. The price for 1 sq.m. at vacuum collectors of type A and G corresponds approximately as 3.14/1 and, therefore, application of plastic collectors is quite proved. For comparison the area 35m.kv is chosen as the covering of 70% of a mirror of the pool is one of the simplified recommendations at selection of the area of plastic collectors. It is necessary to add to the aforesaid that for plastic collectors it isn't required to install intermediate heat exchangers and to use the additional circulation pulser. For circulation through plastic collectors water from the pool is used directly, and, in certain cases it is possible to involve available in system

LIST OF REFERENCES:

1. Harchenko N. V. Individual solar installations. – M, Energoatomizdat, 2000.

2. Antonio Bridanti. Thermal pumps in premises.//AVATARS, 2001, No. 5, page 24-32.

3. Theoretical bases heating engineers. Heattechnical experiment. Reference book. under the editorship of A. V. Klimenko. 2002