Heat pump with optimized filter arrangement

Abstract

The invention relates to a heat pump with a supply air filter in a supply air ventilation duct (11) and an exhaust air filter in an exhaust air ventilation duct (12), wherein the supply air filter and the exhaust air filter are contained in mutually insulated chambers (14, 15) of a filter slide box (10) mounted in an externally accessible inlet / removal duct of the heat pump, which filter slide box crosses the supply air ventilation duct (11) with one of the chambers (14, 15) and the exhaust air ventilation duct (12) with the other of the chambers (14, 15), and which is arranged so as to be removable from the heat pump for replacing the supply air filter and the exhaust air filter.

Description

[0001] The invention relates to a heat pump with a supply air filter in a supply air ventilation duct and an exhaust air filter in an exhaust air ventilation duct.

[0002] A heat pump, such as an air-to-water heat pump, draws in ambient air using an integrated fan and directs it into an evaporator. In the evaporator, the heat is transferred to a refrigerant, which evaporates. The compressor raises the refrigerant pressure and temperature to a higher level. The heat pump's supply and exhaust air streams are cleaned using several filters, both supply and exhaust.

[0003] How often heat pump filters need to be changed depends on various factors, such as the quality of the outside air where the heat pump is installed and the manufacturer's specific recommendations. However, it is generally recommended to check the filters every three to six months and clean or replace them as needed.

[0004] Regularly checking the filters is important to ensure they are not clogged or dirty. Clogged filters can restrict airflow and impair the performance of the heat recovery system. If the filters show visible dirt or deposits and / or are difficult to blow through, this is a clear sign that they need to be replaced.

[0005] It's also advisable to check the filters more frequently if the heat pump is operated in an environment with high levels of air pollution, allergen exposure, or increased dust and dirt particle production. In such cases, it may be necessary to check or clean the filters every two to three months to maintain their effectiveness.

[0006] Some heat pump models are equipped with a filter monitoring sensor that monitors the condition of the filters and alerts you when replacement is necessary. In these cases, the operator can rely on the filter replacement indicator.

[0007] It's important to recognize the signs that a filter replacement is necessary and to check the filters regularly to ensure they are working properly. Here are some common signs that the filters need to be replaced: Visible dirt: If the filters show visible dirt, contaminants, or deposits, this is a clear indication that they need to be replaced. A buildup of dust, dirt, pollen, or hair can impair filter performance and restrict airflow.

[0008] Restricted airflow: If you notice a decrease in the airflow in the room or the amount of air passing through the vents, this may be a sign that the filters are clogged. Clogged filters can restrict airflow and reduce the efficiency of the heat recovery system.

[0009] Allergy symptoms or poor indoor air quality: If you experience allergy symptoms such as sneezing, coughing, or a stuffy nose, this may indicate that the filters are no longer effectively removing particles such as pollen, dust, or other allergens. A deterioration in indoor air quality may also indicate that the filters are no longer working properly and should be replaced.

[0010] Increased energy consumption: A sudden increase in energy consumption may also indicate a dirty or clogged filter. Inefficient filters can restrict airflow and cause the heat pump to require more energy to achieve the desired heating or cooling output.

[0011] Unpleasant odors or noises: Clogged or dirty filters can lead to unpleasant odors, as dirt particles can accumulate and settle in the heat pump. Clogged filters can also cause unusual noises, such as loud humming or whistling, as the heat pump tries to combat the restricted airflow.

[0012] Previously, the filters were separated into coarse filters and fine filters at different positions on the device, in the supply air and exhaust air streams.

[0013] Fine filtering of the bypass volume flow has not been possible with this arrangement so far, and automation of the bypass volume flow in this form has also not been feasible.

[0014] An object of the invention is therefore to equip a heat pump with a filter arrangement that is easy and effectively replaceable and that also integrates the bypass volume flow into the filtration.

[0015] This object is achieved by the subject matter of claim 1. The dependent claims relate to expedient and inventive developments of this invention.

[0016] The invention accordingly provides a heat pump with a supply air filter in a supply air ventilation duct and an exhaust air filter in an exhaust air ventilation duct, wherein the supply air filter and the exhaust air filter are contained in mutually insulated chambers of a filter slide box mounted in an externally accessible inlet / removal duct of the heat pump, which filter slide box crosses the supply air ventilation duct with one of the chambers and the exhaust air ventilation duct with the other of the chambers, and which is arranged so as to be removable from the heat pump for replacing the supply air filter and the exhaust air filter.

[0017] In other words, the invention creates a filter box in the form of a slider, for heat pumps and ventilation systems in general, which accommodates all necessary filters and allows for the replacement of all air filters in a single operation. In this case, this replacement filter box is referred to as a filter slider box.

[0018] Advantageously, when the filter box is retracted, the exhaust air filter is positioned in the chamber closest to the front in the insertion direction, so that the exhaust air flows through an internal air / air heat exchanger and, alternatively, through a bypass path. The supply air filter, on the other hand, is located in the rear chamber of the extendable filter box to filter the supply air flow.

[0019] The supply air filter preferably comprises a coarse filter and a fine filter in a "sandwich design," with the sandwich design of the filters positioned in the chamber of the filter slide box so that the air flow passes through the coarse filter first, followed by the fine filter. The reason for this is that the (washable) coarse filter can trap coarser contaminants, thus increasing the service life of the fine filter.

[0020] A necessary prerequisite for the flow guidance in connection with the filter slide box is the sealing of the different ventilation ducts / ventilation areas of the heat exchanger with each other.

[0021] In order to separate the air flow areas, a sealing concept is used in which the structural separation point of the air flows is sealed by an inner wall, which is penetrated by the filter slide box, using a “sealing flap seal”.

[0022] In principle, however, any rag material in the form of an airtight, flexible material is conceivable, such as leather, preferably in oiled or greased form, various types of rubber or synthetic fibers.

[0023] The sealing principle corresponds to the usual closure of open spaces in the installation space, whereby the sealing flap material is positioned tightly clamped between the front and rear slide segments and protrudes slightly on all four sides of the slide by an average of a few tenths to a millimeter, depending on the application, and seals against the structural border of the slide, in this case a metal frame embedded in the EPS.

[0024] In other words, the invention provides that the adjacent walls of the two chambers of the filter slide box are circumferentially enclosed by a sealing lip protruding from the walls, which sealing lip is in tight engagement with the wall of the ventilation duct in which the filter slide box is arranged in order to guide the supply air and exhaust air passing through the ventilation duct at different positions separately through the supply air and exhaust air filters in the filter slide box.

[0025] The sealing lip around the edge of a plate is preferably a plate that is clamped between the adjacent walls of the two chambers of the filter sliding box.

[0026] An alternative sealing arrangement is as follows: the two chambers of the filter slide box have different cross-sections, so that the partition wall of the rear chamber of the filter slide box in the direction of insertion protrudes with a circumferential edge over the partition wall of the front chamber, which is an opening in a wall that separates the supply air duct from the exhaust air duct, with a sealing lip on the circumferential edge of the partition wall of the rear chamber sealingly engaging with the supply air / exhaust air partition wall.

[0027] The invention is explained in further detail with reference to the embodiment shown in the drawing figures. Fig. 1 shows the arrangement of the filter-fan slide provided according to the invention in its working position in the air flow environment of an air-to-air heat exchanger, Fig. 2 shows a view of the two chambers of the filter slide box in the area of ​​their partition walls, between which a seal is arranged, which projects circumferentially beyond the partition walls, Fig. 3 shows a view of the ventilation area of ​​the heat exchanger with the respective flow patterns, and Fig. 4 shows a Fig. 2 alternative sealing arrangement.

[0028] Identical and structurally identical parts are provided with identical reference numbers. The figures may contain simplified or schematic representations. Different views of identical parts may be scaled differently.

[0029] In Fig. Figure 1 shows a section of an air-to-water heat pump with a supply air filter in a supply air ventilation duct 11 and an exhaust air filter in an exhaust air ventilation duct 12, which is separated from the supply air ventilation duct 11 by a ventilation duct partition 13. The filters are positioned in a filter slide box 10, which is arranged in an inlet / outlet duct of the heat pump and is accessible from the outside to be pushed into its working position as intended and removed from the inlet / outlet duct. As shown in Fig. 2, the filter slide box 10 comprises two chambers 14 and 15 in which the supply air filter and the exhaust air filter are arranged so that they communicate with the supply air ventilation duct and the exhaust air ventilation duct, respectively.

[0030] When the filter slide box 10 is retracted, the exhaust air filter is positioned in the chamber 15 located at the front in the insertion direction, so that the exhaust air flow passes through an internal air / air heat exchanger (not shown) and, alternatively, through a bypass path (also not shown). The supply air filter for the supply air is arranged in the rear chamber 14 of the extendable filter slide box 10 for filtering the supply air flow.

[0031] The supply air filter comprises a coarse filter and a fine filter in a “sandwich design”, with the coarse filter and then the fine filter being exposed to the air flow.

[0032] In an advantageous embodiment, the exhaust air filter comprises a coarse filter and a fine filter in a “sandwich construction”, whereby the coarse filter and then the fine filter are exposed to the air flow first.

[0033] According to an advantageous concept, the filter in the respective chamber 14, 15 of the sandwich construction is positioned so that the coarse filter is the first to be flowed through. This advantageously applies to the exhaust air filter and the supply air filter, if provided.

[0034] As further stated Fig. 2, the adjacent walls of the two chambers 14 and 5 are circumferentially enclosed by a sealing lip 16 protruding from these walls, which tightly engages the wall of the ventilation duct in which the filter slide box 10 is located, in order to guide the supply air (arrow B) and exhaust air (arrow A) passing through the ventilation duct at different positions separately through the supply air and exhaust air filters in the filter slide box 10. The sealing lip 16 forms the projecting edge of a plate-shaped seal, which is arranged between the adjacent walls of the chambers 14, 15.

[0035] The sealing lip 16 is clamped between the chambers by means of a screw connection and seals around the filter slide box. Fig. 2 shows a section through the chambers 14, 15 of the filter slide box 10 and the sealing lip 16, with the sealing area above the filter slide box, sealing the right heat pump area from the left heat pump area for the air layers to be separated from each other.

[0036] Fig. Figure 3 shows a horizontal section through the ventilation section of the heat pump. The partition wall between the airflow sections is visible. With the filter box 10 fully retracted, the supply air flows through the heat exchanger and thus also through the bypass duct to be filtered. The filter in question is not shown here; only a grille 17 of the filter box 10 is visible to allow the lower section of the heat pump to be viewed.

[0037] In Fig. In Figure 3, the large arrow C indicates the supply air flow through the supply air filter, while the medium-sized arrow D indicates the supply air flow below the supply air filter, i.e., in the filtered state, towards the bypass duct. The small arrow E indicates the supply air flow below the supply air filter, flowing in the filtered state towards the air / air heat exchanger.

[0038] Fig. 4 shows a Fig. 2 alternative sealing of the filter slide box 10 against the heat exchanger environment.

[0039] In Fig.4, the two chambers of the filter slide box have different cross-sections, so that the end wall of the front chamber of the filter slide box in the insertion direction projects with a circumferential edge over the end wall of the rear chamber, which forms an opening in a wall that separates the supply air duct from the exhaust air duct, wherein a seal 20 on the circumferential edge of the partition wall of the rear chamber is in sealing engagement with the supply air / exhaust air partition wall. List of reference symbols 10 filter slide box 11 Supply air ventilation duct 12 Exhaust air ventilation duct 13 Ventilation duct partition wall 14 rear chamber 15 front chamber 16 Sealing lip 17 grids 18 Coupling bulkhead 19 Coupling bulkhead 20 Seal

Claims

[1] Heat pump with a supply air filter in a supply air ventilation duct (11) and an exhaust air filter in an exhaust air ventilation duct (12), wherein the supply air filter and the exhaust air filter are contained in mutually insulated chambers (14, 15) of a filter slide box (10) located in an externally accessible inlet / removal duct of the heat pump, the filter slide box (10) having one of its chambers (14, 15) cross the supply air ventilation duct (11) and the other of its chambers (14, 15) cross the exhaust air ventilation duct (12), and the filter slide box is arranged to be removable from the heat pump for the purpose of replacing the supply air filter and the exhaust air filter. [2] Heat pump according to claim 1, wherein the exhaust air filter is positioned in the front chamber (15) in the inserted position of the filter slide box (10) such that the exhaust air flow passes through an internal air / air heat exchanger and through a bypass path. [3] Heat pump according to claim 2, wherein the supply air filter for the supply air is arranged in the rear chamber (14) of the extendable filter slide box (10) for filtering the supply air flow. [4] Heat pump according to one of claims 1 to 3, wherein the supply air filter and the exhaust air filter comprise a coarse filter and a fine filter in a ‘sandwich’ construction, wherein the filter is positioned in the respective chamber of the filter slide box (10) such that the coarse filter and then the fine filter are penetrated by the airflow first. [5] Heat pump according to a de spraye 1 to 4, wherein the adjacent end walls (18,19) of the two chambers (14, 15) are enclosed all around by a sealing lip (16) projecting from the walls, which is tightly engaged with the wall of the ventilation duct in which the filter slide box (10) is arranged in order to guide the supply air and exhaust air passing through the ventilation duct at different positions separately through the supply air and exhaust air filters in the filter slide box (10). [6] Heat pump according to claim 5, wherein the sealing lip (16) is the edge of a plate which is arranged in a clamping fit between the adjacent end walls (18) of the two chambers (14, 15) of the filter sliding box (10). [7] Heat pump according to one of claims 1 to 4, wherein the two chambers (14, 15) of the filter slide box (10) have different cross-sections, so that the end wall of the front chamber (15) of the filter slide box (10) in the insertion direction projects with a circumferential edge over the end wall (19) of the rear chamber (14), which has an opening in a wall (13) that separates the supply air duct (11) from the exhaust air duct (12), wherein a sealing lip (20) on the circumferential edge of the partition wall of the rear chamber (15) engages in a sealing manner with the supply air / exhaust air partition wall (13). [8] Heat pump according to any one of claims 1 to 7, wherein the filter slide box has a rectangular cross-section.

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