The method of transformation of heat

 

(57) Abstract:

Usage: heat pumps. The inventive absorption of the working substance are by compression of its steam in the ejector-absorber together with his weak solution, and desertia working substance is carried out in the ejector by strong expansion of the solution. Released vapor of the working substance perepuskat in the ejector-absorber. 1 Il.

The invention relates to methods of transformation of heat, which converts thermal energy of one temperature potential energy of another thermal capacity, and is intended to provide cold or heat, or both.

Known methods, in which the transformation temperature potential heat energy is carried out for the account of absorption and desorption of the working substance, such as ammonia absorbent, such as water-ammonia solution (E. I. Sokolov, V. M. Berdyansk "Energy basis of transformation of heat and cooling processes", - M.: Energoizdat, 1981, S. 109 - 134).

In the known methods of transformation of heat of desorption of the working substance is carried out by evaporating the alcoholic solution due to its heating hot water steam, then steam kondenseerumise this method, you must wrap high-grade heat. On the other hand, the implementation of these processes requires the use of cumbersome and bulky apparatus. Accordingly, the known method can be applied only where there is a high-grade heat in the form of heating steam.

The claimed invention solves the problem of implementation of transformation of heat by absorption and desorption of the working substance absorbent, without the use of steam heating using electricity.

This is achieved by replacing the process of evaporation of the working agent in the generator by heating the concentrated alcoholic solution of desorption him with decreasing pressure of the solution at its adiabatic expansion in the ejector, and the replacement of the absorption process of the working substance in the absorber by cooling the weak solution in the absorption process of working heat in the ejector by adiabatic compression it to pair with a lean liquid absorbent.

Thus, in the present invention the absorbance of the working substance are by compression of its steam in the ejector together depleted solution and the desorption of the working substance is carried out at the strong expansion of the solution in the ejector, causing the mixture obladaet depleted solution, the resulting mixture is heated.

Comparative analysis of the prototype and the proposed solution shows the fundamental difference between the processes of absorption and desorption of vapor of the working substance, and therefore the claimed invention meets the criterion of "novelty."

The drawing shows a diagram illustrating the method of transformation of heat.

The scheme consists of a pump 1, the ejector-absorber 2, heat exchanger 3, the ejector-desorber 4, the heat exchanger 5 and the connecting pipe 6.

Transformation of heat is carried out as follows.

Pump 1 pumps the mixture of the working substance and the absorbent through the ejector-absorber 2, the heat exchanger 3, the ejector-desorber 4 and the heat exchanger 5. Heat Q1at temperature T1down to the heat exchanger 5, resulting in the solution of the working substance is heated in the heat exchanger 5 on t1= T1- T4and after compression in the pump 1 at P = P2- P1served in the ejector-absorber 2, where the diffuser it expands to a pressure P3and mixed with the incoming pipeline 6 working substance, and the mixture is then compressed in the confuser ejector-absorber 2 to the pressure P4. As a result of compression of the mixture of working wisest 3, where heat Q1at T2give the consumer, cooling the mixture at t2= T2- T3.

After the heat exchanger 3, the cooled mixture at T3and pressure P5served in the ejector-desorber 4, where the diffuser it expands with P5to P6. In the process of expanding the mixture of the working substance desorption of naturally, the mixture is depleted and cooled to T3to T4. Released during the expansion of steam at a pressure P6separated from the mixture and perepuskat of the ejector-desorber 4 in the ejector-absorber 2. Depleted and the cooled mixture is sent at T4and P7in the heat exchanger 5, where it is heated from T4to T1by absorbing the heat of the Q1. Then the cycle repeats.

A prerequisite for the transformation of heat, i.e. the absorption of Q1at T1in the heat exchanger 5 and the allocation of Q2at T2in the heat exchanger 3, is the bypass steam of the working medium through the pipeline 6 of the ejector-desorber 4 in the ejector-absorber 2 due to the fact that the pressure after the expansion of the strong solution in the ejector-desorber 4, i.e., P6choose more steam pressure after the expansion of the weak solution in the ejector-absorber 2, i.e. P3or P6> P3. Last dousa such when after expansion in the ejector-absorber 2 is provided a deeper decompression. On the other hand, the differential pressure created by the pump 1 (P2- P1), chosen so that it is ensured the circulation of the mixture in the circuit and meet the condition:

P2- P1(P2- P4) + (P4- P5) + (P4- P7) + (P7- P1)

where

(P2- P4) = (P2- P3) - (P4- P3- the differential pressure on the ejector absorber 2;

(P4- P5) and (P1- P7) - loss of pressure on heat transfer equipment and pipelines;

(P5- P7) = (P5- P6) - (P7- P6- the differential pressure on the ejector absorber 4.

If (P7- P6) > (P5- P6), the ejector-desorber 4 can operate in pumping mode.

The heat balance is determined by the ratio:

Q2= Q1+ AL,

where

L - power pump.

The heat transformer can operate in the mode of the refrigeration machine, in this case, the depleted solution of the working medium circulating through the heat exchanger 5, should have a temperature T4above the freezing temperature of the solution at P1- T4) G1C1,

where

G1- the number of circulating solution (mixture);

C1the heat capacity of the solution,

the heat generated in the heat exchanger 3

Q2= (T2- T3) G2C2.

the heat generated in the ejector-absorber 2 through absorption of the working substance

Q3= (T2- T1) G2C = Gxqa,

where

Gx- the number of the working substance, absorbed in the ejector;

qadifferential heat of absorption,

the heat taken in the ejector-desorber 4 due to the desorption of the working substance

Q4= (T3- T4) G C = Gxqa,

where Gx- the number of the working substance, desormiere in the ejector;

qaD - differential heat of desorption.

Conversion

< / BR>
where

Ln- power pump.

To calculate the factorithe necessary experimental data for the evaluation of losses in the ejector, pipelines and heat exchangers. In the absence of such data, for a rough estimation, you can use the published calculation for otheractor transformers heat (see "Thematic swords conditions preheating from 5 to 65oC is of orderi= 4 - 6.

The proposed method of transformation of heat can also find wide application in refrigeration to obtain the temperature range from minus 30 to 5oC. thus, the main advantages in comparison with the prototype are.

the high value of the conversion factor,

a significant decrease of metal absorption heat transformer by replacing cumbersome equipment with ejectors.

The method of transformation of heat by absorption and desorption of the working substance absorbent material, characterized in that the absorbance of the working substance are by compression of its steam in the ejector-absorber with his weak solution and the desorption of the working substance is carried out in the ejector by strong expansion of the solution, and the separated vapor of the working substance perepuskat in the ejector-absorber.

 

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