System and method for generating heating and cooling capacity in a workpiece processing plant

Abstract

The present invention relates to a system (100) and a method for generating heating and cooling capacity in a workpiece processing plant (102), in particular in a vehicle body painting shop (103), the system (100) comprising a cold water network (104) supplying cold water to the consumer (146), the cold water network having a cold water storage device (110) for compensating for process load peaks and / or a cold water network heat transfer device (112, 154, 158) for recovering heat from the consumer (146), a hot water network (106) supplying hot water to the consumer (146), the hot water network having a hot water storage device (120) for compensating for process load peaks and / or a hot water network heat transfer device (122, 166) for recovering heat from the consumer (146), and a heat pump device (132), the cold water network (104) being connected to the hot water network (106) by the heat pump device (132), the networks (104, 106) having different temperature levels.

Description

[Technical Field]

[0001] The present invention relates to a system and method for generating heating and cooling capacities in workpiece processing plants, particularly vehicle body paint shops, particularly where seasonal climatic conditions are taken into account. [Background technology]

[0002] In practice, it is known that an increasing number of car manufacturers are considering electrifying their processing plants, such as paint shops, in the process of combating global warming. If the current used for this purpose comes from renewable energy, the production can be considered CO2-neutral. In addition to directly electrified processes, such as drying processes, other processes are supplied via hot and / or cold water networks.

[0003] As is known, the provision of hot water in large quantities involves the use of fossil fuel heaters and / or electric heaters or heating devices. In the case of electric heaters, the supplied electrical energy is converted directly into thermal energy. In the case of fossil fuel heaters, the supplied energy is converted into heat for the hot water network with almost 100% efficiency, based on the calorific value.

[0004] However, demand for fossil fuel heaters continues to decline, as they do not allow for CO2-neutral operation. If H2 burners are used as an alternative to heat hot water networks, availability is highly location-dependent, and there are also several safety aspects that need to be taken into account.

[0005] When using electric heaters, the greatest burden is providing the connected load. The location of the heater within the treatment plant is crucial here. Furthermore, a load-center transformer station may be required to provide the heater's required operating voltage. Furthermore, the overall efficiency of a heating system operated by purely electrical means is reduced by a factor of 3 to 5, depending on the temperature level or temperature, compared to a heating system based on a heat pump.

[0006] Compression chillers are known that produce large volumes of chilled water. In this case, the compression of the refrigerant requires the supply of electrical energy. The heating capacity discharged to the environment corresponds to the cooling capacity plus the power consumed. On average, 3-4 kilowatt-hours of cooling energy can be generated here from 1 kilowatt-hour of electrical energy.

[0007] However, in the case of compression chillers, the installed power must be designed for the maximum cooling requirements of the connected process. In some cases, the installed peak power is only needed for a few hours per year. Also, heat must be dissipated to the surroundings, and efficiency decreases as the outside temperature increases.

[0008] In both production processes, i.e. when producing hot and cold water, the supply temperatures of the hot and cold water networks are used as constant target control variables to control the operating capacity of the heaters or chillers, so that when consumption levels are low the corresponding units, i.e. heaters or chillers, are shut down, for example in accordance with the number and size of the units dictated by the maximum capacity required.

[0009] The required cooling and heating capacities vary greatly over the course of a year, or even a day, depending on external climatic conditions. Therefore, in some cases, installed units are only in operation for a small portion of the year. Furthermore, the need for heating capacity at night and cooling capacity during the day must always be taken into account, due to the variation in external conditions throughout the day.

[0010] Therefore, due to known climate variations, it is common for heater capacity to be designed for winter operation and chiller capacity to be designed for summer operation, with the result that neither unit is generally fully utilized at any one time.

[0011] To recover heat from the exhaust air of process processes in plants, particularly for reasons of sustainability and efficiency, the exhaust air is fed into an existing hot water network. Heat recovery is achieved by a heat exchanger and is therefore only possible if the exhaust air stream has a higher temperature level than the hot water network. In other words, the temperature level of the hot water network limits the temperature level of the heat recovery. Therefore, to further enable heat recovery from the exhaust air, the temperature of the exhaust air stream needs to be higher than that of the hot water network.

[0012] Generally, in processing plants, such as vehicle body paint shops, heated water is used for air conditioning. The temperature level for this purpose is determined by the winter air conditioning (dry, cold air). This temperature level must be high enough to raise the outside air to a specific enthalpy level for the target state. The target state with the required relative humidity is achieved by subsequent (adiabatic) spray humidification. In this case, it must be taken into account that in winter a large temperature difference occurs between the air flow leaving the processing plant and the air flow drawn into it. This temperature difference results in an enthalpy difference between the inlet and outlet air flows of the plant. This enthalpy difference must be consumed for the plant's air conditioning.

[0013] In winter, the supply temperature of hot water, which is used as a constant target control variable, is determined by the heating of the outdoor air. Before the dry outdoor air can be humidified, it must be heated until it has the enthalpy to evaporate the water to be absorbed and until the set temperature is reached. Thus, the heating sets the required enthalpy of the dry air to the corresponding temperature. The required temperature of the dry air increases the higher the humidity is desired. This difference is greatest during the cold winter months.

[0014] On the other hand, in summer the outside air already has a relatively high humidity, so that the required temperature level of the hot water circuit is lower, since the incoming air flow does not have to be heated to the same extent.

[0015] Therefore, at a constant temperature level in the hot water network of a treatment plant, the temperature level itself is determined by the driest and coldest outside air and as a result is higher than the temperature level required over the long term of the year. Summary of the Invention

[0016] The present invention aims to provide a system for providing heating and cooling capacity to the consuming processes of a workpiece processing plant in an energy optimized and sustainable manner.

[0017] According to the invention, this object is achieved by a system having the features of claim 1.

[0018] The system is useful for generating and supplying heating and cooling capacity in workpiece processing plants, particularly vehicle body paint shops.

[0019] The system according to the invention preferably comprises: at least one chilled water network for supplying chilled water to the consuming process, the chilled water network having at least one chilled water storage device for compensating for process load peaks and / or at least one chilled water network heat transfer device for recovering heat from the consuming process; at least one hot water network for supplying hot water to a consumer process, the hot water network having at least one hot water storage device for compensating for process load peaks and / or at least one hot water network heat transfer device for recovering heat from the consumer process; at least one heat pump device, in particular at least one first heat pump device, At least one cold water network is connected to at least one hot water network by at least one heat pump device, the networks having different temperature levels.

[0020] Preferably, the system further comprises at least one hot water network for supplying hot water to the consuming process, the at least one hot water network having at least one hot water storage device for compensating process load peaks.

[0021] Furthermore, at least one hot water network can have at least one hot water network heat transfer device for recovering heat from a consuming process.

[0022] The system preferably further comprises at least one second heat pump device; at least one hot water network is connected to at least one hot water network by at least one second heat pump device, or The at least one hot water network is connected to the at least one cold water network by means of at least one second heat pump device.

[0023] Particularly preferably, the system according to the invention as a whole comprises: at least one chilled water network for supplying chilled water to the consuming process, the chilled water network having at least one chilled water storage device for compensating for process load peaks and / or at least one chilled water network heat transfer device for recovering heat from the consuming process; at least one hot water network for supplying hot water to a consumer process, the hot water network having at least one hot water storage device for compensating for process load peaks and / or at least one hot water network heat transfer device for recovering heat from the consumer process; at least one hot water network for supplying hot water to a consuming process, the hot water network having at least one hot water storage device for compensating for process load peaks and / or at least one hot water network heat transfer device for recovering heat from the consuming process; at least one first heat pump device; at least one second heat pump device; Equipped with At least one cold water network is connected to at least one hot water network by at least one first heat pump device, and at least one hot water network is connected to at least one hot water network or at least one cold water network by at least one second heat pump device, the networks having different temperature levels.

[0024] The present invention is based on the basic concept that, in a workpiece processing plant, the central hot water, warm water, and cold water generation in three corresponding networks is realized by preferably two heat pump devices or heat pumps, and the networks are connected to each other via heat pumps. Here, the different seasonal climatic conditions of summer (warm, humid ambient air) and winter (cold, dry ambient air) must be taken into account so that excess heat from the cold water generation in summer is supplied to the hot water network and the hot water network. If additional heat is present, this heat is transferred to the exhaust air via a heat transfer device or heat exchanger or supplied to the surroundings of the processing plant. In contrast, in winter, the cold water network is used as a heat storage device using heat recovery means. The recovered heat is then converted by the heat pump device into usable hot water and / or hot water again.

[0025] Furthermore, as mentioned above, due to the desire for CO₂-neutral production of the cooling, hot and hot water required in the treatment plant, the complete electrification of the units for producing the cooling, hot and hot water should be realized, whereby the power introduced into the units should be as low as possible, taking sustainability and energy saving into consideration. Therefore, the energy consumption per workpiece or vehicle body should be reduced to a minimum, and for that purpose, inter alia, the heat recovery means according to the present invention are integrated into the system.

[0026] Basically, the combined system of three water networks can be subdivided into three functional areas: the first area forms the heat recovery system, the second area is allocated to the heat pump and storage equipment, and the third area is where the consumers or processes of the treatment plant are located.

[0027] In this specification and in the appended claims, the term "network" or "water network" is to be understood to mean several interacting circuits of respective temperature levels or respective temperature flows.

[0028] In this specification and the appended claims, the term "circuit" should be understood to mean a combination of lines, which may be formed by pipes, hoses, etc., forming an open or closed circuit and through which water at each temperature level can flow in one direction, preferably in two directions, and which may directly or indirectly include further elements, such as a consumption process, a heat transfer device, a storage device or a heat pump device.

[0029] In this specification and the appended claims, the term "consuming process" or "consumer" should be understood to mean any process or any plant equipment that requires a supply of cold, warm or hot water in the context of processing a workpiece.

[0030] In this specification and the appended claims, the term "connected" should be understood to mean fluidly connected, especially in a direct or indirect manner.

[0031] The different temperature levels of the three networks allow a wide variety of consumer processes or units to be supplied, and numerous consumer processes or units can be connected to the cold and hot water networks. Such processes or units are primarily ventilation systems and must be adjusted to changing external conditions. Thus, large fluctuations in required capacity can occur throughout the day, particularly in the cold and hot water networks. In contrast, processes or units in the hot water network, such as one or more pre-treatment stations and one or more intermediate dryers in a vehicle body painting plant, draw heat quite constantly from the network or distribution network, and boilers or burners only need to be installed for startup purposes. In other words, the hot water network is preferably connected to a continuous consumer process.

[0032] Different temperature levels in the network may allow the use of different storage devices, where a balance is preferably struck between the available space in the processing plant and the complexity of the storage devices.

[0033] As for the first heat pump device between the cold water network and the hot water network, one or more conventional industrial heat pump devices can be used, since the temperature is preferably at a maximum of 60°C and preferably at a low temperature level with a temperature distribution mainly between 30°C and 40°C.

[0034] Heat recovery using heat transfer devices allows the energy of consumer process streams leaving the treatment plant to be reused. With the help of heat pump devices, these consumer process streams can be raised to a temperature level usable for the respective networks. In this case, waste heat from different consumer processes can be supplied to the chilled water network for optimal energy utilization. However, care must be taken to ensure that the first heat pump device only has a certain input power, which generally depends on the cooling capacity. To the extent that this cooling capacity (including the consumer processes in the chilled water network) is exceeded, heat recovery measures must be implemented in the hot water network. Process streams with undershot dew points are particularly important for heat recovery in terms of energy. Examples of process streams for heat recovery in vehicle body painting plants include cooling zone exhaust streams, dryer exhaust streams, spray booth exhaust streams, waste heat from compressed air production, exhaust streams from pre-treatment (VBH) or cathodic dip coating (KTL), and dryer waste heat.

[0035] Dedicated heat transfer equipment for heat recovery is preferably installed for the various process streams, and the piping burden should be weighed against the benefits.

[0036] If the hot water network is connected directly to the cold water network via a second heat pump device, i.e. bypassing the hot water network and the first heat pump device, this has the advantage that the capacity in the hot water network can be used to generate cooling capacity. Furthermore, by bypassing the hot water network, transmission losses are minimized, thereby increasing the efficiency of cooling capacity generation.

[0037] It is therefore even possible to increase efficiency by bypassing the first heat pump device between the cold water network and the hot water network, which is known to be particularly advantageous in the case of hot ambient / climatic conditions (due to the climate zone and / or time of year) when high levels of cooling capacity are required, allowing consumers to use the waste heat required for producing cold in the hot water network.

[0038] It may be advantageous if at least one cold water storage device and / or at least one hot water storage device and / or at least one hot water storage device is connected to the supply and return of each network.

[0039] Storage devices, preferably acting as buffer storage in the respective networks, allow for compensation of process load peaks, i.e., both maximum and minimum values, of the consuming processes attached or connected to the respective networks. To ensure that the size of the respective storage devices remains commercially attractive, their size or capacity is designed to smooth or level the daily load curve. The resulting advantage is, on the one hand, that the heat pump devices can be made smaller, and, on the other hand, that the heat pump devices can be operated continuously. Furthermore, fluctuations in heat recovery due to changing consuming process conditions can be absorbed and transferred to the consuming process in a metered manner.

[0040] Furthermore, each of the networks may comprise at least one consumer process circuit and / or at least one heat pump circuit, with at least one storage device of the respective network being directly or indirectly integrated into each of the circuits.

[0041] In another embodiment of the invention, at least one of the networks may comprise at least one heat recovery circuit in which a respective storage device is directly or indirectly integrated.

[0042] In particular, it is preferred if the at least one first heat pump device can be controlled according to at least one variable from the group comprising cooling capacity, heat requirement, temperature, accumulator energy charge and accumulator capacity.

[0043] By connecting to the hot and cold water networks, the first heat pump unit generates cold on the one hand and heat or thermal energy on the other hand for the consumption process. This maximizes the efficiency and utilization of the heat pump unit. The power input to the heat pump unit depends on the maximum cooling capacity to be generated, which is generally greater than the maximum heating capacity. On extreme days, the storage devices of the two networks reduce the maximum heating and cooling capacity of the first heat pump unit to the average capacity requirements.

[0044] In summer, the operation of the first heat pump unit is preferably determined by the cooling capacity required for the consumption process. The generated heating capacity is discharged to the hot water storage unit. If the consumption values ​​(including the consumption values ​​of the second heat pump unit) are greater than the generated heat, the heat recovery is first interrupted. If there is still an excess (the supply temperature of the hot water network increases), the generated heat must first be removed from the hot water network via an exhaust heat transfer device, and if this is not sufficient, it must be removed by a free cooling device or free cooler.

[0045] If the hot water temperature level drops in summer, the temperature rise of the first heat pump unit decreases, thereby increasing efficiency. This leads to a reduction in heat generation in the hot water network. However, it becomes more difficult to discharge excess heat energy from the hot water network to the surroundings, a free cooling system, or the exhaust air. In this case, it becomes necessary to hydraulically attach the hot water network to an additional heat exchanger for the exhaust air (low temperature level) to be heated, since this exhaust air (low temperature level) supplies heat energy to the cold water network during winter operation. Preferably, this burden should be compared with the benefits.

[0046] In winter, the first heat pump unit is preferably sized according to the heat requirements of the hot water network. However, the cold requirement is not sufficient to generate heat energy for the hot water network alone, so the cold requirement must be increased. This means that heat must be introduced into the cold water network by heat recovery means, i.e., via a heat transfer device in the process exhaust. In this way, all process streams leaving the treatment plant can be cooled down to approximately the temperature level of the cold water network, thereby maximizing the energy utilization of the streams leaving the treatment plant.

[0047] The power introduced into the first heat pump device is preferably designed according to the average daily cooling requirement on extreme days, since experience has shown that this represents a greater heat flow during the operation of the first heat pump device. Therefore, the heat recovery means for generating thermal energy in winter utilizes the existing installed power. If the temperature level of the cold water network decreases, on the one hand, more heat can be recovered by the process, and on the other hand, the temperature rise of the first heat pump device can be increased. In this way, more electrical energy and less thermal energy from the cold water network are needed to introduce the same thermal energy into the hot water network.

[0048] During the transition period between summer and winter, the first heat pump device is preferably adjusted according to the consumer, ultimately the hot or cold water network. Consequently, the temperature levels of the two networks, especially the supply temperature, are kept constant using the control means for summer or winter operation. Since heat and cold production is predominant, the first heat pump device operates most efficiently here. Ideally, the heat and cold production is balanced in terms of the heat pump's coefficient of performance (COP) and energy efficiency ratio (EER).

[0049] It may be preferred that the at least one further second heat pump device is a high temperature heat pump.

[0050] To connect a hot or cold water network to a hot water network, a high-temperature heat pump is required, whose main purpose is to generate heat energy for the hot water network. This process uses heat energy from the hot or cold water network. Since this type of high-temperature heat pump is installed in a continuous consumer, it must ensure that heat is supplied from a network with a lower temperature level.

[0051] Therefore, when the first and second heat pump devices are connected by a hot water network, thermal energy from the cold water network can be used indirectly in the hot water network, which is necessarily considered to be more efficient than direct generation by an electric boiler.

[0052] If the cold water network is connected to the hot water network by a second heat pump device, the thermal energy from the cold water network can be used directly in the hot water network, and losses during transfer to the hot water network and from the hot water network to the second heat pump device are avoided compared to the above case.

[0053] In another embodiment of the invention, the system may have at least one latent heat storage device arranged in at least one cooling water network and / or at least one hot water network.

[0054] By adding a latent heat storage device, the system according to the invention makes it possible to store excess thermal energy of the hot water network in summer and supply this thermal energy to the cold water network in winter, thus raising the thermal energy from the cold water network to the level of the hot water network with the help of the first heat pump device.

[0055] In another embodiment of the invention, the system may have at least one thermal wheel for moisture and heat transfer within the hot water network.

[0056] A rotary heat exchanger, also known as a thermal wheel, is a heat exchanger that preferably allows the recovery of moisture and heat between two air streams. The moisture and heat are transferred from one air stream to the other by a rotating storage mass that is alternately heated by one air stream and cooled by the other.

[0057] The thermal wheel's moisture and heat transfer allows preconditioning of the fresh air, and the recovered heat reduces the temperature level of the air before the humidified inflow. A thermal wheel is preferably installed between the intake and exhaust of all processes requiring humidified intake air.

[0058] It may be advantageous if at least one hot water network has at least one free cooling device, preferably a free cooling device for summer operation of the treatment plant.

[0059] The free cooling device makes it possible to remove the generated heat from the hot water network when there is excess heat energy beyond the heat recovery, i.e. when there is excess heat energy that cannot be transferred any further by the heat transfer device.

[0060] In another embodiment of the invention, at least one cold water network may have a temperature level between 0°C and 30°C, preferably between 0°C and 25°C, at least one hot water network may have a temperature level between 20°C and 65°C, preferably between 25°C and 60°C, and at least one hot water network may have a temperature level between 55°C and 100°C, preferably between 60°C and 100°C.

[0061] It may be advantageous if the temperature level of the at least one cold water network and / or the at least one hot water network can be adapted to the air humidity and / or temperature of the environment of the treatment plant.

[0062] More preferably, the storage capacity of the cold water storage device can be made 25% to 400%, particularly 50% to 300%, larger than the storage capacity of the hot water storage device.

[0063] In another embodiment of the present invention, the storage capacity of the hot water storage device can be smaller than the storage capacity of the cold water storage device and / or the hot water storage device, preferably 10% to 75% smaller, more preferably 25% to 50% smaller.

[0064] In another embodiment of the invention, at least one hot water network can be indirectly and / or directly connected to at least one cold water network.

[0065] The object of the invention can further be achieved by a method for generating heating and cooling capacity in a workpiece processing plant, in particular a vehicle body paint shop. The method according to the present invention is carried out using the system described above, supplying cold and / or hot water to a consumer of a treatment plant; temporarily storing thermal energy in a cold water storage device and / or a hot water storage device; recovering thermal energy from the exhaust of one or more consuming processes; generating cooling and / or heating capacity with a first heat pump device; Includes.

[0066] The method may have, inter alia, each or several of the features and / or advantages described in relation to the system.

[0067] Furthermore, the method preferably comprises: supplying hot water to a consumer of a treatment plant; temporarily storing the thermal energy in a hot water storage device; may additionally include:

[0068] In another preferred embodiment of the present invention, the method may additionally comprise the step of producing heating capacity by a second heat pump device.

[0069] It may be further preferred if the heat is pumped indirectly and / or directly from the cold water network to the hot water network.

[0070] Further features and / or advantages of the invention form the subject of the following description and graphical illustrations of exemplary embodiments. [Brief explanation of the drawings]

[0071] [Figure 1] 1 is a schematic diagram of a first embodiment of a system according to the invention; [Figure 2] FIG. 2 is a schematic diagram of a second embodiment of the system according to the invention. [Figure 3] FIG. 3 is a schematic diagram of a third embodiment of the system according to the invention. [Figure 4] FIG. 4 is another schematic diagram of the third embodiment of FIG. 3. [Figure 5] FIG. 4 is a schematic diagram of a fourth embodiment of the system according to the invention. [Figure 6] FIG. 6 is another schematic diagram of the fourth embodiment of FIG. 5. [Figure 7] FIG. 5 is a schematic diagram of a fifth embodiment of the system according to the invention. [Figure 8] 10 is a schematic diagram of a sixth embodiment of the system according to the invention, in all figures elements that are identical or have the same functional effect are provided with the same reference signs. DETAILED DESCRIPTION OF THE INVENTION

[0072] A first embodiment of a system 100, generally designated 100, shown in FIG. 1, serves to generate heating and cooling capacity in a workpiece processing plant 102.

[0073] The processing plant 102 is specifically a vehicle body paint shop 103 .

[0074] The system 100 according to the invention comprises at least one cold water network 104, at least one hot water network 106 and at least one hot water network 108.

[0075] The networks 104, 106, 108 preferably have different temperature levels or temperatures, ie in particular the temperature of the water conveyed in each network is different from the temperature of the water conveyed in the other two networks.

[0076] The cold water network 104 preferably has a temperature level between 0°C and 25°C, the hot water network 106 preferably has a temperature level between 25°C and 60°C, and the hot water network 108 preferably has a temperature level between 60°C and 100°C.

[0077] The chilled water network 104 includes at least one chilled water storage device 110 and at least one chilled water network heat transfer device 112 .

[0078] Furthermore, the chilled water network 104 comprises at least one consumer process circuit 114, at least one heat pump circuit 116 and at least one heat recovery circuit 118, in which the chilled water network heat transfer device 112 is arranged.

[0079] The hot water network 106 includes at least one hot water storage device 120 and at least one hot water network heat transfer device 122 .

[0080] Furthermore, the hot water network 106 comprises at least one consumer process circuit 124, at least one first heat pump circuit 126, at least one second heat pump circuit 128, and at least one heat recovery circuit 130, in which the hot water network heat transfer device 122 is arranged.

[0081] The cold water network 104 and the hot water network 106 are connected to each other by a first heat pump device 132, and in particular the heat pump circuit 116 of the cold water network 104 and the first heat pump circuit 126 of the hot water network 106 are connected to the first heat pump device 132.

[0082] The first heat pump storage device 132 is preferably a conventional industrial heat pump.

[0083] The hot water network 108 includes at least one hot water storage device 134 and at least one hot water network heat transfer device 136 .

[0084] Furthermore, the hot water network 108 also comprises at least one consumer process circuit 138, at least one heat pump circuit 140 and at least one heat recovery circuit 142 in which the hot water network heat transfer device 136 is arranged.

[0085] The hot water network 106 and the hot water network 108 are connected to each other by a second heat pump device 144, and in particular the second heat pump circuit 128 of the hot water network 106 and the heat pump circuit 140 of the hot water network 108 are connected to the second heat pump device 144.

[0086] The second heat pump device 144 is preferably a high temperature heat pump.

[0087] The first heat pump device 132 and the second heat pump device 144 are electric pump devices with a specified input power, which preferably corresponds to the maximum capacity to be generated for the required cooling or heat in the system 100 during periods of climate peaks.

[0088] The consumer circuits 114 , 124 , 138 of the networks 104 , 106 , 108 supply chilled, hot and / or heated water to one or more consumers 146 .

[0089] In the paint shop 103, the consuming process 146 is, for example, a cooling zone or a pre-treatment station, and the exhaust air 148 of the consuming process 146 is substantially supplied to one or more cold water network heat transfer devices 112. In the paint shop 103, the consuming process 146 is, for example, a dryer, and the exhaust air 148 of the consuming process 146 is substantially supplied to one or more hot water network heat transfer devices 122.

[0090] Exhaust air 148 emitted from one or more consuming processes 146 is exhausted from the treatment plant 102 via an exhaust line 150 leading to an exhaust outlet on the roof 152 .

[0091] The exhaust lines pass through the heat transfer devices 112, 122, 136 of the networks 104, 106, 108 so that the exhaust or expelled process medium 148 flows through these networks and transfers a portion of the heat energy contained in the exhaust back to the heat recovery circuits 118, 130, 142 in the process.

[0092] The exhaust air 148 from the consumer 146 is cooled with chilled water in the chilled water network heat transfer device 112 before reaching the exhaust air outlet on the roof 152, thereby minimizing the temperature of the exhaust air on the roof.

[0093] The storage devices 110, 120, 134 are connected to the supply and return of each network 104, 106, 108 and damp fluctuations in the respective networks 104, 106, 108 during the supply of water for the consumer 146, and the capacity of the storage devices 110, 120, 134 is preferably designed to smooth the load curve of the consumer 146 over the course of a day. As a result, the heat pump devices 132, 144 can be designed particularly minimally.

[0094] In particular in the paint shop 103, all consumption processes 146 that depend on external conditions, i.e., climatic conditions outside the paint shop, are supplied almost exclusively by the cold water network 104 and the hot water network 106, so the storage capacities of the cold water storage device 110 and the hot water storage device 120 should be dimensioned to be greater than the capacity of the hot water storage device 134.

[0095] By coupling the cold water network 104 to the hot water network 106 via the first heat pump device 132, the thermal energy supplied to the cold water network 104 can be raised using the first heat pump device 132 to a temperature level useful for the consumption process 146 supplied by the hot water network 106.

[0096] By connecting the first heat pump device 132 to the chilled water network 104 and the hot water network 106, the first heat pump device 132 can generate cold on the one hand and heat on the other hand, thereby achieving maximum efficiency and utilization. Furthermore, simultaneous generation of cooling and heating capacities is possible except during extreme winter and summer months. The power input is preferably consistent with the maximum cooling capacity to be provided.

[0097] The second heat pump device 144 makes it possible to supply the necessary heat energy to the consuming processes 146 of the hot water network 108 which require higher temperature levels, ie in particular water temperature levels above 60°C.

[0098] If there is sufficient thermal energy remaining in the cold water network 104 and / or the hot water network 106, this thermal energy can be raised to the temperature level of the hot water network 108 by the second heat pump device 144 or by the first heat pump device 132 and the second heat pump device 144.

[0099] Therefore, preferably, no additional equipment other than the heat pump units 132, 144 is required to generate heating and cooling capacities during normal operation of the processing plant 102, such as the paint shop 103. Apart from this, there are consuming processes 146, e.g., drying processes, that require temperatures above 100°C, corresponding to the above-mentioned temperature levels of the networks 104, 106, 108.

[0100] Furthermore, a thermal wheel (not shown) can be installed between the intake and exhaust of all consuming processes 146 that require humidified intake air in order to lower the temperature level of the hot water network 106. The moisture transfer of the thermal wheel allows preconditioning of the incoming fresh air, with a corresponding reduction in the temperature level of the fresh air before the humidified intake. Thus, even in dry and cold winter external conditions, it is possible to condition the fresh air to a relative humidity of 65%.

[0101] In summer, it is preferable to lower the temperature level of the hot water network 106 to increase the efficiency of the first heat pump device for producing chilled water. However, if an excess supply of thermal energy from the hot water network 106 to the outside air outside the treatment plant 102 or to the exhaust air 148 of the consumption stage 146 is expected, then it should be considered to increase the temperature level of the hot water network.

[0102] In winter, the temperature level of the chilled water network 104 is reduced, which makes it possible to achieve efficient heat recovery. The resulting reduction in COP allows the first heat pump device 132 to supply more heat to the hot water network 106 from the same thermal energy from the chilled water network 104.

[0103] Further detailed differences between additional embodiments of the system 100 according to the present invention shown in Figures 2 to 7 will be explored below, but it should be understood that all of the benefits and technical effects discussed above in relation to the first embodiment can also be achieved in the following embodiments.

[0104] 2 shows a second embodiment of the system 100 according to the invention, in which a plurality of parallel heat transfer devices are incorporated in the heat recovery circuit 118 of the chilled water network 104. Thus, for example, the thermal energy contained in the exhaust air 156 coming from a separate consumer process 146 is transferred in a separate heat transfer device 154 to the chilled water in the heat recovery circuit 118, the thermal energy contained in the exhaust air 160 coming from another separate consumer process 146 is transferred in another separate heat transfer device 158, and the thermal energy contained in the exhaust air 148 carried in the exhaust line 150 is transferred in the heat transfer device 112 to the chilled water.

[0105] The system 100 further includes an air compressor 162, and the waste heat is transferred in a first circuit 164 to hot water by another heat transfer device 166 in the heat recovery circuit 130 of the hot water network 106, and in a second circuit 168 to hot water by a hot water network heat transfer device 136 in the heat recovery circuit 142 of the hot water network 108.

[0106] In a second embodiment of the system shown in FIG. 2, the exhaust line 150 preferably does not pass through the hot water network heat transfer device 136 .

[0107] In a third embodiment of the system 100, shown in Figures 3 and 4, a latent heat storage device 170 is further provided, said device being connected to the cold water network 104 and the hot water network 106 via a latent heat storage circuit 172. In summer, excess thermal energy in the hot water network 106 is stored in the latent heat storage device 170, as shown in Figure 3. This thermal energy stored in the latent heat storage device 170 can then be made available to the cold water network 104 in winter, as shown in Figure 4, and can then be raised from the cold water network 104 to the temperature level of the hot water network 106 by the first heat pump device 132.

[0108] 5 and 6 show a fourth embodiment of a system 100 according to the present invention, with the system 100 in a summer mode within a treatment plant 102.

[0109] In summer mode, the first heat pump device is determined by the cooling capacity required for the consumption process 146. The generated heating capacity is discharged to the hot water storage device 120. If the consumption value involving the second heat pump device 144 is greater than the one generated, the heat recovery performed by the heat recovery circuit 130 is first interrupted, as shown in Figure 6.

[0110] If an excess continues to exist, for example due to an increase in the supply temperature of the hot water network 106, the generated heat must first be discharged from the treatment plant 102 on the roof 152 via the exhaust outlet by the exhaust heat transfer device 174.

[0111] If this is not sufficient, a free cooling device 176 should be provided, which is integrated into the hot water network 106 via a free cooling circuit 178. Excess heat energy can be removed from the hot water network 106 by the free cooling device 176.

[0112] Furthermore, in the fourth embodiment shown in Figures 5 and 6, it can be seen that the cold exhaust air 148 of one or more consuming processes 146 downstream of the hot water network heat transfer device 136 can be returned to one or more further consuming processes 146 that can use the reduced temperature exhaust air as intake air, thereby ensuring that the heat recovery circuit 130 does not receive additional heat energy from the heat recovery of the hot water network 108.

[0113] Figure 7 shows a fifth embodiment of the system 100 in winter mode. In this fifth embodiment, as in the second embodiment of Figure 2, three heat transfer devices 112, 154, 158 are provided in the heat recovery circuit 118 of the chilled water network 104, said heat transfer devices recovering heat energy in parallel from the consumer processes 156, 160 and the exhaust line 150 to the chilled water network 104.

[0114] Furthermore, the heat transfer circuit 130 of the hot water network 166 also has a further heat transfer device 166 through which the low-temperature exhaust 148 is supplied to one or more consumer processes 146 after transferring thermal energy or at least a portion of the thermal energy from the exhaust 148 of the one or more consumer processes 146 and thus remains within the treatment plant 102 in the first example.

[0115] The same applies to the hot water network 108, whose heat recovery circuit 142 similarly returns the cold exhaust 148 to one or more consumer processes 146 downstream of the hot water network heat transfer device.

[0116] Figure 8 shows that in a sixth embodiment of the system 100, compared to the first embodiment of Figure 1, the available capacity from the hot water network 108 can be used directly as an alternative to the generation of cooling capacity in the cold water network 104, thereby bypassing the hot water network 106 and the first heat pump device 132.

[0117] For this purpose, on the one hand, the second heat pump device 144 is connected to the cold water storage device 110 via the second heat pump circuit 128 of the cold water network 104, and on the other hand, to the hot water storage device 134 via the heat pump circuit 140 of the hot water network 108, so that heat can be pumped directly from the cold water network 104 to the hot water network 108. In this way, the consuming processes in the hot water network 146 can be supplied by waste heat from the cold water network 104. [Explanation of symbols]

[0118] List of symbols 100...system, 102...treatment plant, 103...paint shop, 104...chilled water network, 106...hot water network, 108...hot water network, 110...chilled water storage device, 112...chilled water network heat transfer device, 114...consumer process circuit, 116...heat pump circuit, 118...heat recovery circuit, 120...hot water storage device, 122...hot water network heat transfer device, 124...consumer process circuit, 126...first heat pump circuit, 128...second heat pump circuit, 130...heat recovery circuit, 132...first heat pump device, 134...hot water storage Device, 136...hot water network heat transfer device, 138...consumer process circuit, 140...heat pump circuit, 142...heat recovery circuit, 144...second heat pump device, 146...consumer process, 148...exhaust, 150...exhaust line, 152...exhaust outlet on the roof, 154...heat transfer device, 156...exhaust, 158...heat transfer device, 160...exhaust, 162...air compression device, 164...first circuit, 166...heat transfer device, 168...second circuit, 170...latent heat storage device, 172...latent heat storage circuit, 174...exhaust heat transfer device, 176...free cooling device, 178...free cooling circuit.

Claims

1. A system (100) for generating heating and cooling capacities in a workpiece processing plant (102), in particular in a vehicle body painting shop (103), comprising: at least one chilled water network (104) for supplying chilled water to a consumer process (146), the chilled water network (104) having at least one chilled water storage device (110) for compensating for process load peaks and / or at least one chilled water network heat transfer device (112, 154, 158) for recovering heat from the consumer process (146); at least one hot water network (106) for supplying hot water to a consumer process (146), the hot water network (106) having at least one hot water storage device (120) for compensating for process load peaks and / or at least one hot water network heat transfer device (122, 166) for recovering heat from the consumer process (146); at least one heat pump device, in particular at least one first heat pump device (132); Equipped with A system (100) in which the at least one cold water network (104) is connected to the at least one hot water network (106) by the at least one heat pump device (132), the networks (104, 106) having different temperature levels.

2. 2. The system (100) of claim 1, wherein the system (100) comprises at least one hot water network (108) for supplying hot water to a consuming process (146), the at least one hot water network (108) having at least one hot water storage device (134) for compensating process load peaks.

3. 3. The system (100) of claim 1 or 2, characterized in that the system (100) comprises at least one hot water network (108) for supplying hot water to a consumer process (146), the at least one hot water network (108) having at least one hot water network heat transfer device (136) for recovering heat from the consumer process (146).

4. the system (100) comprising at least one second heat pump device (144); the at least one hot water network (106) is connected to the at least one hot water network (108) by the at least one second heat pump device (144), or 4. The system (100) according to claim 2 or 3, characterized in that the at least one hot water network (108) is connected to the at least one chilled water network (104) by the at least one second heat pump device (144).

5. The system (100) according to any one of claims 2 to 4, characterized in that the at least one cold water storage device (110) and / or the at least one hot water storage device (120) and / or the at least one hot water storage device (134) are connected to the supply and return of the respective networks (104, 106, 108).

6. 6. The system (100) according to any one of claims 1 to 5, characterized in that each of the networks (104, 106, 108) comprises at least one consumer process circuit (114, 124, 138) and / or at least one heat pump circuit (116, 126, 128, 140), and at least one storage device (110, 120, 134) of the respective network (104, 106, 108) is directly or indirectly integrated into each of the circuits.

7. 7. The system (100) according to any one of claims 1 to 6, characterized in that at least one of the networks (104, 106, 108) comprises at least one heat recovery circuit (118, 130, 142) in which the respective storage device (110, 120, 134) is directly or indirectly integrated.

8. The system (100) according to any one of claims 1 to 7, characterized in that the at least one first heat pump device (132) can be controlled according to at least one variable from the group comprising cooling capacity, heat requirement, temperature, accumulator energy charge and accumulator capacity.

9. The system (100) according to any one of claims 4 to 8, characterized in that said at least one second heat pump device (144) is a high temperature heat pump.

10. The system (100) according to any one of claims 1 to 9, characterized in that the system (100) comprises at least one latent heat storage device (170) arranged in the at least one cooling water network (104) and / or the at least one hot water network (106).

11. The system (100) according to any one of the preceding claims, characterized in that it comprises at least one thermal wheel for moisture and heat transfer within the hot water network (106).

12. The system (100) according to any one of claims 1 to 11, characterized in that the at least one hot water network (106) has at least one free cooling device (176), preferably a free cooling device for summer operation of the treatment plant.

13. 13. The system (100) according to any one of claims 2 to 12, characterized in that the at least one cold water network (104) has a temperature level between 0°C and 30°C, preferably between 0°C and 25°C, the at least one hot water network (106) has a temperature level between 20°C and 65°C, preferably between 25°C and 60°C, and the at least one hot water network (108) has a temperature level between 55°C and 100°C, preferably between 60°C and 100°C.

14. 14. The system (100) according to claim 13, characterized in that the temperature levels of the at least one cold water network (104) and / or the at least one hot water network (106) can be adapted to the air humidity and / or temperature of the environment of the treatment plant (102).

15. The system (100) according to any one of claims 1 to 14, characterized in that the storage capacity of the cold water storage device (110) is 25% to 400%, in particular 50% to 300%, greater than the storage capacity of the hot water storage device (120).

16. The system (100) according to any one of claims 2 to 15, characterized in that the storage capacity of the hot water storage device (134) is smaller than the storage capacity of the cold water storage device (110) and / or the hot water storage device (120), preferably 10% to 75% smaller, more preferably 25% to 50% smaller.

17. The system (100) according to any one of claims 2 to 16, characterized in that said at least one hot water network (108) is indirectly and / or directly connected to said at least one cold water network (104).

18. A method for generating heating and cooling capacities in a workpiece processing plant (102), preferably a vehicle body paint shop (103), said method being carried out using a system (100) according to any one of claims 1 to 17 and comprising the following steps: supplying cold and / or hot water to the consumer (146) of the treatment plant (102); Temporarily storing thermal energy in the cold water storage device (110) and / or the hot water storage device (120); recovering thermal energy from the exhaust (148, 156, 160) of one or more consuming processes (146); generating a cooling and / or heating capacity by said heat pump device (132), in particular by said first heat pump device (132); A method comprising:

19. supplying hot water to the consumer (146) of the treatment plant (102); temporarily storing thermal energy in the hot water storage device (134); 20. The method of claim 18, further comprising:

20. 20. The method according to claim 18 or 19, characterized in that it further comprises the step of generating a heating capacity by means of a further heat pump device (144), in particular the second heat pump device (144).

21. Method according to any one of claims 18 to 20, characterized in that heat is pumped indirectly and / or directly from the cold water network (104) to the hot water network (108).

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