DD201188A1 - METHOD FOR REGULATING MASS FLOW AND CONCENTRATION IN RESORPTION PUMP CIRCUITS - Google Patents

Abstract

The invention relates to a method for controlling mass flow and concentration in Absorptionswaermepumpenkreislaeufen and allowed without the hitherto necessary effort for the solvent exchange, the use of absorption heat pumps for heating purposes with suitable parameters for space heating. Their aim is to increase the advantages of the absorption heat pump with regard to the low max. Systemdruecke with a reduced control engineering and investment costs to link. The object of the invention is to develop a method for the control of Resorptionswaermepumpenkreislaeufe by combining the two parallel Loesungsmittelstroeme and solve this task by defined mixing and redistribution of rich and poor solution.

Description

a) Title of the invention

Method of controlling mass flow and concentration in absorption heat pump cycles

b) Field of application of the invention

The invention relates to a method for controlling mass flow and concentration in Resorptionswärmepumpenkreisläufe and allowed without d © n previously required effort for the solvent exchange, the use of absorption heat pumps for heating purposes with suitable parameters for space heating »

c) Characteristic of the known technical solutions Resorption heat pumps basically consist of two mutually parallel, working at different pressure level absorption heat pump circuits, wherein in the circuit with the higher pressure level of the condenser by a second absorber (Resorber) and in the circuit with low pressure level of the evaporator by a second Exchangers (degasifiers) are replaced by the separate solvent cycles, the heat pump process can only be maintained if in both circuits equal amounts © Dampfmengen of the same concentration ström® This forced condition of mass flow and concentration therefore requires a permanent defined solvent exchange between the two circuits » In the prior art, this is done via an additional solvent line between the degasser and the absorber or ₀ via an additional steam line between the expeller (high Te temperature level) and the degasser (low temperature level) with associated high technical control effort (DE-OS 2? 56 910) to compensate for the changes in concentration that occur when the temperature of the heat sources changes »

233343 1

For this reason, resorption heat pumps for the operation of Baumbeizsystemea with simultaneous utilization of heat sources low potentials biaher not eingeaetzt. For example, in a case such as this, it has been proposed to arrange several exhaust heat pump cycles at different temperature levels in order to avoid the control engineering outlay of a resorption cycle.

d) Object of the invention

The aim of the invention is to enable the use of resorption heat pumps for the operation of heating systems with a high economic effect by reducing dea investmenta expenditure (elimination of the additional steam line) and the associated regulatory technical problems.

e) Presentation of the essence of the invention

The object of the invention is to develop a method for the control of Resorptionswärmepumpenkreisläufe by unification of the two parallel solvent streams, so that a special solvent exchange between the two circuits is no longer necessary.

According to the invention, this object is achieved by mixing the total amount of the rich solution with the total amount of the poor solution in the transition from the lower pressure level desorbing / absorbing process to the higher pressure level circuit, heating and subsequently to Austre; and absorber is split. Conveniently, this mixing takes place after the poorer solution leaving the degasser and the rich solution leaving the absorber have been brought to a correspondingly higher pressure level or the rich solution after the absorber is so far subcooled that no vapor fraction can form after mixing.

By combining the hitherto separate working cycles, the piping and pumping effort is reduced significantly, and it is a much simplified process control achieved In addition, a minimal regulatory effort is possible, since ai can be dispensed with a concentration-mass balance.

The adaptation of the qualitative and quantitative parameters to the heat demand requirements is possible by means of pressure and temperature control «,

f) embodiment

The invention will be explained in greater detail by means of an exemplary embodiment of the invention. In the accompanying drawing, is the method according to the invention in a circuit for space heating and domestic hot water heating unteg? Using a heat source of low potential shown. The substance pairing for the absorption heat pump is ammonia / water;

The expeller 1 is heated by a heating medium voß 130 ⁰ O (heating water or steam from Hl or HKS?) Ußd the expelled refrigerant vapor supplied to the Eesorber 3, This running at a high pressure level process is previously in an analogous manner at a lower pressure voastatten «Dazu the degasser 14, the medium, a waste heat source with eXuer temperature of 10 ⁰ O supplied. At the same time, the "poor" solution from the expeller 1 is fed to this absorber 10 and absorbs the refrigerant vapor while releasing heat. The resulting "rich" solution from the absorber 10 is, according to the invention, mixed with the "poor" solution from the degasser 14 after it has been mixed By the pumps 7 and 12 were raised to a higher pressure level vod about 8 kp / cm, * Subsequently, the solvent mixture, to reduce expended for the expeller heating heat in the heat exchanger 6 by heat exchange with the "poor" solution from the impeller 1 heated. Thereafter, the distribution of the solvent mixture "EiD part is as" rich ¹⁴ solution again in the expeller 1-led, the other than "poor" solution in the Resorber 3 "Resorber 3 and absorber give the Absorptio.nswa.rme to the Return of the heating circuit of the consumer from and warm it from about * 30 ⁰ C to 60 ⁰ G on «

Claims (2)

233343 1 invention claim A method for controlling Resorptionswärmepumpenkreisläufe characterized in that the total amount of the rich solution with the total amount of the poor solution in the transition from the running at a low pressure level Desorptiong ~ / absorption process mixed to the running at a higher pressure level part of the circuit, then heated and Exporter (1) and Eesorber (3) is divided. 2. The method according to item 1, characterized in that the mixing takes place after the degasser (14-) leaving the poor solution and the Eesorber (10) leaving rich solution via pressure increasing means (7; 12) have been brought to a higher pressure level , For this 1 sheet drawings