FR2509443A1 - HEAT PUMP ASSEMBLY WITH PARALLEL BIVALENT OPERATION COMPRISING A BURNER THAT PRODUCES FUMES - Google Patents

Abstract

HEAT PUMP-ABSORBER ASSEMBLY WITH BIVALENT PARALLEL OPERATION AND IMPROVED EFFICIENCY. IN THE CASE OF A HIGH POWER DEMAND, AND IN PARTICULAR WHEN SWITCHING BURNER 1 TO ITS HIGHER POWER LEVEL, SMOKE FROM BURNER 1 CIRCULATES DIRECTLY IN A SMOKE-HEAT EXCHANGER 22.

Description

2509-443

  The present invention relates to a heat pump assembly-

  dual-mode absorber in parallel, comprising a

  burner producing fumes which are transmitted to an eject.

  by a rich refrigerant solution, as well as a

  An evaporator, an absorber and a connecting pipe for the heat transfer fluid between the absorber and the feed pipe. Such a heat pump assembly, with a bivalent operation in parallel with a boiler and an absorber heat pump, is described in FIG.

  Patent Application of the Federal Republic of Germany P 30 18 705 4.

  The heat transfer fluid's flowing pipe contains a heat exchanger

  their smoke-coolant, whose smoke circuit is in

  series with the ejector Such an assembly with heat pump and function-

  bivalent in parallel has the advantage that the heating heat requirements of a building for example can be covered throughout the year by the single heat pump-absorber arrangement,

  with minimal fuel consumption.

  The invention aims to improve the performance of a pump assembly

heat of the aforementioned type.

  According to an essential characteristic of the invention, an exchange of

  Smoke heat-coolant heat pump is inserted into the connecting pipe and fed directly into fumes via a

isolation organ.

  An advantage of the invention lies in the fact that in view of

  the direct heat transfer between the fumes and the heat

  carrier, the exchange surfaces can be maintained relatively

  small, especially in heavily stressed and costly rooms.

such as the ejector.

  According to another characteristic of the invention, the burner

  feels at least two levels of power and switching on the

  higher power level opens the smoke isolation device.

  According to another characteristic of the invention, the burner has at least two power levels and the switching on the level of

  higher power closes the isolation member of the coolant.

  According to another characteristic of the invention, after passing through the ejector, the fumes are transmitted to a second heat exchanger smoke-heat transfer fluid, inserted in the conduit of the heat transfer fluid These characteristics have the advantage of a

  automatic adaptation of the assembly to the instantaneous demand by

heat.

  According to another characteristic of the invention, the feed ejector

  the absorber in lean solution through an exchange of

  poor heat solution and regulator; and a poor solution line, bypass on said heat exchanger, is

  equipped with a valve which opens the bypass line when the temperature

  This embodiment has the additional advantage that, for the same total power of the heat pump assembly, it is possible to size the heat-transfer fluid heat exchanger for a heat pump.

  lower power, that is to say to reduce its cost and

  In other words, for the same dimensioning of the sample,

  heat of smoke-heat transfer fluid, the arrangements according to the invention increase the total power of the assembly with heat pump. Other features and advantages of the invention will be

  better understood using the detailed description below of a

  exemplary embodiment and the accompanying drawings in which Figure 1 shows the block diagram of the installation; and

  FIG. 2 represents a constructive embodiment

  geous. The pipes and circuits of the various fluids are characterized

as follows in Figure 1.

  The gaseous refrigerant, for example NH 3, is indicated by two parallel lines; a solid line is used for the refrigerant in the liquid phase. Such a dot line indicates a poor solution line; a line in points

  and dashes indicate a rich solution A line in large dash indi-

  that a coolant pipe, that is to say hot water preferably, and a line in small dash an air duct The flue pipes are marked by small oblique lines on

their entire length.

  The burner 1 supplies, via the flue 2, the ejector

  3 of known structure, with rectifier 4 and dephluster 5.

  The ejector 3 supplies gaseous refrigerant to the condenser 6, which is inserted into the hot water return pipe 7 and in which the heat of condensation released is supplied to the hot water constituting the heat transfer fluid. The water circuit hot contains

  also the heat exchanger constituting the dephlegmator 5 pre-

  city. The liquefied refrigerant in the condenser 6 is transmitted by the heat exchanger 8 to the evaporator 9, whose main elements are the valve 10 and the heat exchanger 11. Downstream of the valve 10, the liquid refrigerant d The supply undergoes a relaxation of, for example, approximately 18 to 2 bar. Heat input occurs in the exchanger 11, in particular by drawing heat from the supply air 12, so that the gaseous refrigerant enters the heat exchanger. heat exchanger 8 at a temperature of about -5 to 10 oc and in the absorber 13 at about 7-20 'OC a poor solution

  is transmitted from the ejector 3 to the absorber 13 via the heat exchanger

  their 14 and the expander 15, which reduces the pressure of for example about 18 bar to about 2 bar; the absorber 13 provides a solution

  rich in the ejector 3 by the pump 16 and the heat exchanger 14 pre-

  cited The heat released by absorption is absorbed by water

  hot circulating in the coil 17 of the absorber 13.

  The smoke path is of particular importance in

  the framework of the invention At the exit of the ejector 3, they pass through

  firstly the heat exchanger smoke-hot water 18, and thus strongly heat the hot water from the coil 17 of the absorber 13, then are transmitted through the pipe 19 in the chimney or a

similar device.

  The editing described so far is the subject of the

aforementioned patent application.

  In the assembly according to the invention, the heat exchanger fumes

  hot water 22, that the flue 23 feeds directly into

  smoke, that is to say from the burner 1, is inserted into the

  connecting pipe between the absorber 13 and the hot water upstream pipe 21, which also contains the heat exchanger smoke-hot water 18 above This flue gas pipe 23 contains an isolation member constituted by the smoke register 24 , that the servomotor opens when the burner 1 is switched to its maximum power, as indicated by the action line 26.

  So that hot water does not circulate in the heat exchanger.

  their fumes-hot water 22 during operating periods o said exchanger is not fed with fumes, under penalty of producing annoying heat losses, the conduit 27 bypass on the exchanger 22 is provided with an isolating member constituted by the valve 28 As indicated by the action line 29, the operation of the valve 28 is performed synchronously with the switching of the burner 1

  on its higher power level The servomotor 25 is also

  This can be done by maneuvering the two isolating

  24 and 28 is in the opposite direction. Switching the burner

  their 20 on its higher power level opens the smoke register 24, so that fumes circulate in the exchanger 22, while the valve 28 is closed, so that all the hot water

  also circulates in the exchanger 22.

  The flue path is indicated in FIG. 2 Solid arrows characterize the flue gases that pass through the parts of the assembly constituting the heat pump proper, whereas the arrows in the dashed direction indicate the fumes flowing in operation.

bivalent in parallel.

  The parts of Figure 2 identical to those of Figure 1 have the same references It is seen that the ejector 3 on the one hand and a series of two heat exchangers fumes-hot water

  18, 22 are arranged parallel or side by side on the burner 1.

  The heat exchanger 22 is in the immediate vicinity of the burner 1, to which it is connected by the flue gas pipe 23, while the

  fumes feed the ejector 3 by the smoke pipe 2 Au-

  above the heat exchanger 22 is the flue

  which introduces into the heat exchanger 18 the fumes having circula-

  In the pure heat pump operation, the heat exchanger 22 is isolated by the flue gas register 24, but the fumes circulating in the ejector 3 also reach the flue gas. In the parallel bivalent operation, that is to say when the flue gas register 24 is open, the flue gases flowing in the heat exchanger 22 also reach the exchanger 18 and undergo

  thus a heat removal in two places.

  In FIG. 1, the pipe 40 of poor solution,

  on the heat exchanger 14, comprises the valve 41 that signals a probe not shown the outside air temperature,

  or the set temperature and a measurement of that temperature.

  outside, control in such a way that

  In this case, when the outside temperature has fallen to a predetermined value, ie at an external temperature of -10 ° C., the poor solution penetrates.

  directly in the absorber 13 while avoiding the heat exchanger 14.

  Relaxation of hot poor solution at the entrance of the absorber

  gas expansion by expansion downstream of the regulator 15 The solution is cooled

  said up to the boiling point under the pressure of the absorber.

  The gas produced by expansion is again absorbed during cooling

  by the hot water circulating in the coil 17; this heat of absorption

  It is also transferred to hot water. The bypass line open at these low temperatures thus causes the hot water to be transferred into the coil 17 from the heat that is transmitted.

  internally in the exchanger 14 in the absence of the

  40 or higher temperatures producing the closure

of the valve 41.

  Valve 41 is fully open, manually or automatically

  relay, for example, in the event of failure of the evapo-

  9 and closed when the outside temperature falls below

of the aforementioned value.

  A numerical example illustrates very clearly the advantage of these provisions.

  In the absence of the bypass 40, a heat exchanger smoke-

  hot water 22 must be sized for a power of 13 k W and

  the ejector 3 for a power of 8.5 k W; the presence of

  It is also possible to size the exchanger 22 for a power of 8.5 kW as a result of the larger temperature difference in the absorber 13.

  the heat exchanger, without loss of power.

  Of course, various modifications may be made by those skilled in the art to the principle and to the devices which have just been described solely by way of nonlimiting examples, without

depart from the scope of the invention.

Claims (6)

claims   1 Bivalent heat-absorber installation in parallel operation, comprising a burner producing fumes which are transmitted to an ejector supplied with a rich solution of refrigerant, as well as a condenser, an evaporator, an absorber and a connecting pipe heat transfer fluid between the absorber and the feed pipe, said assembly being characterized in that a heat exchanger smoke-heat transfer fluid (22) is inserted into the connecting pipe (20) and fed directly with fumes by   via an isolating member (24).   2 Installation with heat pump according to claim 1, characterized in that a bypass (27) of the coolant, containing an isolation member (28), is in parallel with the heat exchanger (22).   3 Installation with heat pump according to one of claims 1 or   2, characterized in that the burner (1) has at least two   calves of power; and switching on the power level   upper opens the isolation member (24) fumes.   4 Installation with heat pump according to one of the claims 2 or   3, characterized in that the burner (1) has at least two power levels; and switching on the power level   upper closes the isolation member (28) of the coolant.   Heat pump assembly according to any one of claims 1 to 4, characterized in that after passing through the ejector (3), the fumes are transmitted to a second heat exchanger smoke-coolant (18), inserted in the driving go (21) heat transfer fluid.   6 Installation with heat pump according to claim 5, characterized in that the ejector (3) and the series connection of the two heat exchangers (18, 22) are arranged side by side on the burner (1), the heat exchanger series heat exchanger (22) being located between the burner (1) and the mouth of a flue (30) extending from the ejector (3); and the smoke isolation member (24) is inserted   in a pipe (23) between the burner (1) and the heat exchanger their (22).   7 Heat pump assembly according to any one of the claims   1 to 6, characterized in that the ejector (3) supplies the absorbent   (13) in lean solution via a heat exchanger.   heat (14) of poor solution and an expander (15); and a   poor solution flow, bypass on the heat exchanger (14), is provided with a valve (41) which opens the pipe in a bypass   (40) when the outside temperature drops to a pre-determined undermined.