DE202006014378U1 - Air conditioning system especially for small rooms has a controlled airflow switched between recirculating and with controlled heating of the fresh air inlet - Google Patents

Abstract

An air conditioning system especially for small rooms has an external duct (1) fitted with a heat store element (2) and with a connection (4) to a recirculating duct (6) containing an airflow control valve (5) and a blower (8). The system is switched by a control which periodically diverts some of the recirculating flow to warm the heat exchanger to prevent icing. The improvement can be applied to split air conditioning systems.

Description

The Invention is in the field of controlled ventilation with Heat recovery and also to the area of room air conditioning. The invention is particularly suitable for installations for the air treatment in small rooms, like the living spaces, Offices, Practices and others The ventilation units used there are mostly decentralized Devices manufactured. This type of ventilation has no air pipes, requires little installation effort, is compact and works well for different climatic and operating conditions.

A size Category of air handling equipment, in which proposed invention is well usable, split air conditioners or Split heat pumps.

State of Technology and disadvantages of the prior art

modern comfortable apartments, offices, hospital rooms should have a good fresh clean air. At the same time demand modern Building standards to ensure a high level of energy savings. The execution of this Demands in modern dense buildings is possible only with the use the ventilation units with heat recovery. Further energy-saving air treatment is often used in small rooms with the use of the split heat pump or split air conditioning performed. The area of split facilities for the individual rooms is currently well developed and several manufacturers are producing it worldwide. Slightly worse are the ventilation units for ventilation single room developed as well as the ventilation units, which with the ventilation Combine the air conditioning.

The Majority of ventilation units with heat recovery works mainly with cross-flow, cross-countercurrent and countercurrent heat exchangers. Their task is to heat only the heat content of the exhaust air Supply air to transfer. The efficiency of existing modern heat exchangers accounts for 70-90%. Therefore, these devices comply the EnEV requirements and the world trends of energy saving.

Example 1:

The most modern decentralized ventilation systems include the "M-WRG" units from Meltem (see the second-hand typeface DE 20203758 U1 ). Similar devices are manufactured by the companies AEREX Haustechniksysteme GmbH - ("EB-Energiebank"), Olsberg Haustechnik GmbH - ("AirCom central"), Roos GmbH etc.

On the deficiencies Such ventilation units are operating problems due to low outside temperatures. at the temperature is less than 0 ° C in the Exhaust duct, it comes to Kanalvereisung. The manufacturers are already at + 5 ° C forced the precautionary measure against the icing. That corresponds to the outside temperature from about + 1 ° C ... + 3 ° C. The safeguards consist in the reduction of the cold fresh air flow. But the resulting inequality of cold and warm air flow leads to the Deterioration of the thermal efficiency the plant. Thus, the ventilation system in fact, the reduced thermal efficiency throughout the cold season. Furthermore because of the inequality of Zuluft- and exhaust air flow reaches the impure air from the kitchen, Bath and toilet room into the living room. The involvement of Facilities in such mode in apartments connected to the fireplace equipped are prohibited.

Another Lack of ventilation systems consists in an unnecessary Dehydration of the home air. That's a result of the replacement the humid indoor air through the fresh air, at the low outside temperature is particularly dry.

Example 2:

The above-mentioned deficiencies do not in part indicate the ventilation units with heat recovery, which are equipped with a regenerative heat exchanger on. This type of construction includes the devices "Inventer" from Öko-Haustechnik inVENTer GmbH (see the second-hand typeface DE 29801917 U1 ) and "Thermo-Lüfter" from LTM GmbH (see the used pattern font DE 9301812 U1 ). Supply and exhaust air in these units flow alternately through one and the same channel, the walls of which form a heat storage. The stream of warm room air cools while heating the heat storage. Thereafter, the countercurrent of the cold outside air heats up, thereby cooling the heat accumulator. Part of the water condensing / freezing while warming bubbles in the channel evaporates / sublimates and returns to the room when it is cold. As a result, the ventilators discussed function more successfully at lower outside air temperatures. For example, the guaranteed range of use of "Inventer" equipment extends to -20 ° C without any precautionary measures.

But this type of ventilation equipment has other disadvantages. Either the bubble durations must be short, or the dimensions and capacity of the heat accumulator should be large enough to ensure acceptable device efficiency. Since the dimensions are almost always limited, bubble times must be short. In doing so, a not enough large amount of air flows into the room during a bubble cycle. The fresh air area is formed on the whole, especially only in the vicinity of the ventilation unit. But from the same area happens in the next process, the suction of the exhaust air. Part of the fresh air will escape immediately. The air exchange efficiency of the apartment decreases. For the same reason, it is necessary to have at least two push-pull plants in one apartment.

eg The device "inVENTer ^® R14" from Öko-Haustechnik inVENTer GmbH supplies 29 m3 of fresh air per hour, which is enough for a living room of 58 m3, but only the amount of air that flows into the room with a single-bubble duration of 70 s about 1 m3, which corresponds to only 2% of the volume.

Next shortage this type of ventilation equipment is a increased noise and increased energy demand of the fan during the Umsteuern.

Besides that is at low outside temperature the incoming air into the room is too cold even for highly efficient installations. Therefore, accommodation of people in the vicinity of the ventilation unit (namely in the fresh air areal) because of the cold forbidden. e.g. When the outside temperature is -20 ° C and the efficiency 80% would be, then would have the incoming air only + 12 ° C.

Example 3:

It is a broad group of air handling devices in one Single room known, which are called split-plant. they consist of two main devices connected to the pipelines and electrical Lines are connected. This is an outdoor device, so-called Compressor set, and interior device, which is intended for room air processing becomes. The internal device of the split system provides an air circulation duct through which a room air circulation happens. This channel points an entry device, which represents a ventilation grille and a filter, an air treatment device, such as an air-refrigerant heat exchanger, a fan and an exit device, which is usually a filter and blind is on.

To belong to the split facilities Air conditioners, heat pumps and universal systems that mostly clean the room air, heat or cool and dehumidify. Here, the room with such split systems with no fresh air supplied. Even more, due to the loss of efficiency it is usual In the case of split systems, a ban on opening the windows during operation. The emerged in recent times split-plants with so-called Oxygen generator can hardly the ventilation problem decide because they can not vent CO2 and water vapor.

The ventilation absence is a major shortcoming of the world's split air conditioners.

Object of the invention:

The The present invention relates to a ventilation unit with the heat recovery and also a split air conditioner or a split heat pump, where the above defects are eliminated. The proposed air treatment unit has higher efficiency with the same dimensions of the heat storage or smaller dimensions with the same efficiency, reduced noise and Energy needs and allows also in the same system the ventilation with the air conditioning to unite the room air.

Solution of the task:

The solutions The tasks were achieved in the following way. The Ventilation unit points one with the outside air connected exhaust air and supply air duct with arranged therein heat storage and an air circulation duct with arranged therein inlet device of the room air, a Fan, air treatment device and outlet device on. Between the inner socket of the heat accumulator and the fan a switching device is provided which is so formed is that she is in her activity the heat storage for sucking in and blistering the fan alternately switches and the air flow in the inlet device when switching to Einsaugenstutzen the Fan and the airflow in the outlet device when switching to the bladder neck accordingly at least partially blocks at the same time.

The Invention is with the attached drawings explained. In the drawings 1 and 2 is a diagram of the ventilation system according to the Zulüfttakt and venting cycle shown. On the drawing 3 is a split version of Ventilation device shown.

1

supply air and vent channel

2

heat storage

3

outdoor spigot the heat storage

4

interior fitting the heat storage

5

switching

6

Air circulation channel

7

admission device

8th

fan

9

One eye socket of the fan

10

bladder neck of the fan

11

Air treatment device

12

exit means

13

heat exchangers Air-refrigerant

14

external Compressor set of the split system

15

piping

The ventilation unit is equipped with the two ventilation ducts. In the supply air and exhaust air duct 1 is the heat storage 2 arranged, the outer pipe 3 connected to the environment. In the air circulation channel 6 are an entry device 7 to enter the room air, a fan 8th , Air treatment device 11 and an exit device 12 intended. The inner neck 4 the heat storage 2 is by means of the switching device 5 to the air circulation channel 6 connected. The switching device 5 is designed so that when you operate the inner socket 4 the heat storage 2 in order to suck in 9 of the fan 8th and then to the bladder neck 10 of the fan 8th is switched on. The connection becomes a suction nozzle 9 with the concomitant reduction of airflow through the inlet device 7 by means of the switching device 5 accompanied. And the connection to the bladder neck 10 with the simultaneous reduction of air flow through the outlet device 12 accompanied. The reduction of the air flow may be partial or the channel may be completely blocked.

Under the air treatment device 11 Above all, one understands an air-refrigerant heat exchanger 13 Condenser or evaporator of a split heat pump or a split air conditioner belonging to the aggregate set. These heat exchangers 13 Condenser or evaporator is with the piping 15 with the compressor set 14 connected to the split plant, which is arranged outside.

Further air treatment device 11 For example, an air heater, an air ionizer, a special filter, etc. may suit the purpose of the appliance.

The design of the switching device 5 is formed in a simple and inexpensive construction of the ventilation device in the form of at least one rotatable, pivotable or liftable flap. Yet another particularly simple and advantageous switching device 5 has a hinged operable flap in which the fan is installed.

The entry 7 and outlet device 12 represent the ventilation grille with air filters and silencers.

The heat storage 2 represents a package of tightly packed double-walled polypropylene sheets. The sheet thickness is less than 4 mm. Due to the highest compactness, the particularly small wall thickness and the sufficient heat capacity of the plates, the effectiveness of heat storage is very high. The favorable geometry properties ensure small flow losses. The market prices of 2 mm double-skin sheets are very favorable because they are widely used as packaging material and polygraphic advertising media.

The ventilation unit works in the following way. There are some modes of the Ventilation unit. The main mode of operation is the work with the aeration and exhaust. There are also it Zulus mode, Ablüftbetriebsart and shutdown.

The Main mode consists of two cyclic repeating positions.

In the Zulüftstellung is the operable switching device 5 in the position which is shown in the drawing 1. The inner neck 4 the heat storage 2 is by means of the actuatable switching device 5 for sucking in 9 of the fan 8th turned on. In this area is always negative pressure. An additional drop in pressure in this area happens because of the reduction in air flow out of the room. This reduction is realized by the at least partial blocking of the air circulation channel 6 in front of the fan 8th by means of the actuatable switching device 5 ,

At least a part of the air flows into the air circulation passage 6 through the heat storage 2 from outside. The previously heated heat storage 2 gives off the heat stored in it to the cold outside air stream, which is heated by it. Thereafter, the heated fresh outside air with the room air flow in the fan 8th mixed. At the same time, the temperature of the mixture is brought closer to room temperature. The air mixture is subsequently in the air treatment device 11 edited and gets into the room. The processing often consists in the heating of the air by means of the heat exchanger condenser 13 a split heat pump when in the air treatment device 11 is arranged.

After the determined time interval or temperature signal, the ventilation unit is moved by means of a movement of the actuatable changeover device 5 converted to bleeding position.

In the Ablüftstellung is the operable switching device 5 in the position which is shown in the drawing 2. The inner neck 4 the heat storage 2 is by means of the actuatable order switching device 5 to the bladder neck 10 of the fan 8th turned on. The air pressure in this area is increased. The additional increase in pressure in this area happens because of the reduction in air flow into the room. This reduction is realized by the at least partial blocking of the air circulation channel 6 after the fan 8th by means of the actuatable switching device 5. At least part of the compressed air passes through the heat accumulator 2 outwards. The previously cooled heat storage 2 is now heated by the warm exhaust air stream again. Then the Zulüftstellung repeated again.

Zulüftbetriebsart or Ablüftbetriebsart of the ventilation unit be by permanent work in the Zulüftstellung and Ablüftstellung realized accordingly.

When the ventilation unit is switched off, the actuatable changeover device is activated 5 placed in the position that Zuluft- and Entluftkanal 1 is tightly closed.

Advantages of offered device

• a) Luftbehandlungsaggregat ist effektiver als die Vorgänger.

The switching device 5 turns around without inertia. The ventilator 8th does not need switching. As a result, there is almost no limitation to shortening the bubble duration. There is thus an opportunity to improve the efficiency of heat recovery or to reduce the size of the heat accumulator 2 , No negative role is played by the reduction of the single air portion, which enters the room with a short Zulu procedure, because the fresh air is mixed with the strong room air flow and also always blown in the same direction (no air flow reversal in the room). Therefore:

• a) Air treatment unit is more effective than its predecessor.

• b) Luftbehandlungsaggregat ist universeller und geräuschloser als die Vorgänger.

Reduction of dimensions of the heat accumulator 2 gives a good opportunity to reduce the flow losses in the heat storage. It is possible to use the low-pressure fans. These include not only conventional radial, diagonal and axial fans, but even the cross-flow fans. At the same time, the operating noise of the system diminishes. Therefore:

• b) Air handling unit is more universal and silent than its predecessors.

• c) Luftbehandlungsaggregat ist energiesparender als die Vorgänger.
• d) Luftbehandlungsaggregat vereinigt alle Vorteile der Raumklimatisierung mit der energiesparenden Belüftung.

The use of the unified common fan without reversing for the ventilation and air circulation reduces the energy consumption of the system and its operating noise. Therefore:

• c) Air handling unit is more energy efficient than its predecessors.
• d) Air treatment unit combines all advantages of room air conditioning with energy-saving ventilation.

Claims (3)

Air treatment unit, including a decentralized ventilation unit with heat recovery, which has the following features: - A channel connected to the outside air 1 with arranged therein heat storage 2 , - an air circulation duct 6 with inlet device arranged therein 7 the room air, fan 8th , Air treatment device 11 and outlet device 12 , - a switching device 5 between the inner nozzle 4 the heat storage 2 and the fan 8th is provided, and is designed so that they are in their operation the heat storage 2 for sucking in 9 and to the bladder neck 10 of the fan 8th alternately turns on and the air flow in the inlet device 7 when switching to Einsaugenstutzen 9 of the fan 8th and the air flow in the outlet device 12 when switching to the bladder neck 10 at the same time partially at least partially blocks. Air treatment unit, including a decentralized ventilation unit with heat recovery according to claim 1, characterized in that an inner air-coolant heat exchanger 13 the split air conditioning / heat pump in the air circulation duct 6 as an air treatment device 11 is set up. Air treatment unit, including a decentralized ventilation unit with heat recovery according to claims 1 and 2, characterized in that the heat storage 2 is made of the tightly packed double-walled plastic sheets with the plate thickness less than 4 mm, while the webs of the plates from the inner socket 4 to the outer neck 3 the heat storage 2 are directed.