Binary solution compressive heat pump with solution circuit

Details Binary solution compressive heat pump with solution circuit Binary solution compressive heat pump with solution circuit

1988-11-18

1990-04-24

King, Lloyd L.

Refrigeration

Refrigeration producer

Compressor-condenser-evaporator circuit

62114, 622386, F25B 100

Patent

active

049189450

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a binary solution compressive heat pump or refrigeration machine having an evaporator and a condenser which are connected together in a solution circuit, in which a binary refrigerant formed preferably of an ammonia and water mixture is circulated, gaseous refrigerants being driven out in the evaporator at a low pressure level by the input of thermal energy at a low temperature level, and the poor solution thus formed being pumped to the condenser after elevating the pressure by means of a pump in a first pipeline branch, where the gaseous refrigerant released in the evaporator is condensed in the poor solution after its pressure has been raised to the condenser pressure by means of a compressor with removal of the heat of condensation produced at an elevated temperature level and the rich solution thus forming flows back to the evaporator in a second pipeline branch with reduction of pressure by means of a throttling member, and a temperature exchanger being inserted into the sections of the first and second pipeline branch which are at the condenser pressure, in which temperature exchanger the heat contained in the rich solution issuing from the condenser is transferred to the poor solution flowing to the condenser and heat contained in the rich solution issuing from the temperature exchanger being furthermore used for the further evaporation of the poor solution fed to the temperature exchanger, the additional evaporator for the further degassing of the poor solution being disposed in the section of the second pipeline branch that runs between the temperature exchanger and the throttling member.
A binary solution compressive heat pump or refrigeration machine (DE-PS 31 19 989) of this kind is known which, in comparison to the corresponding machines operating without additional degassing of the poor solution fed to the temperature exchanger, already has a decidedly improved coefficient of performance.
The invention is addressed to the problem of further improving the coefficient of performance of the known binary solution compressive heat pump (or refrigeration machine).
This problem is solved in accordance with the invention by the fact that at least two pumps increasing the pressure in the poor solution step-wise to the condenser pressure are inserted into the pipeline branch of the solution circuit carrying the poor solution from the evaporator to the condenser, and the additional evaporator on the other hand is disposed in the section of the first pipeline branch running at an intermediate pressure between the two pumps, and by the fact that the gaseous refrigerant additionally driven out of the poor solution in the additional evaporator at the level of the intermediate pressure is pumped to the condenser by a separate compressor or by injection into a medium pressure stage of the multistage compressor pumping the gaseous refrigerant from the main evaporator to the condenser. Thus use is made of the fact that, at a pressure elevated above the low evaporator pressure, the poor solution is additionally condensed by the transfer of heat from the rich solution, and the solution thus made still poorer is capable of reabsorbing a comparatively greater proportion of gaseous refrigerant in the condenser and thus also a comparatively greater amount of resorption heat is produced. It is to be noted, in any case, that the additional evaporation of the poor solution at the intermediate pressure can be performed either instead of the additional evaporation provided in the known heat pump or refrigeration machine, or--preferably--it can be performed in addition to the evaporation at the low evaporator pressure level. Since the gaseous refrigerant driven additionally out of the poor solution will be at an intermediate pressure level, it is clear that the additional power needed from the compressor to pump this additionally outdriven gaseous refrigerant to the condenser need only be proportional to the pressure difference between the intermediate pressure and the condenser pressure.
In advan

REFERENCES:
patent: 2794328 (1957-06-01), Herrick
patent: 4439996 (1984-04-01), Frohbieter
patent: 4707996 (1987-11-01), Vobach

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