US20100242506A1 - Evaporator fan motor control in a refrigerated merchandiser - Google Patents
Evaporator fan motor control in a refrigerated merchandiser Download PDFInfo
- Publication number
- US20100242506A1 US20100242506A1 US12/301,892 US30189206A US2010242506A1 US 20100242506 A1 US20100242506 A1 US 20100242506A1 US 30189206 A US30189206 A US 30189206A US 2010242506 A1 US2010242506 A1 US 2010242506A1
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- Prior art keywords
- evaporator
- mode
- energy consumption
- fans
- fan
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/002—Defroster control
- F25D21/006—Defroster control with electronic control circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/025—Compressor control by controlling speed
- F25B2600/0251—Compressor control by controlling speed with on-off operation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/11—Fan speed control
- F25B2600/112—Fan speed control of evaporator fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
Definitions
- This invention relates generally to a method and apparatus for the operation of evaporator fans and more particularly to the operation of evaporator fans in refrigerated merchandisers.
- Refrigerated merchandisers generally comprise a cooled storage space with shelves and a compressor, an evaporator, and a condenser to carry out a refrigeration cycle to cool the storage space.
- One or more evaporator fans blow storage space air over an evaporator, typically transferring heat energy from the storage space air to a circulating refrigerant in the evaporator coil to facilitate the refrigeration process.
- one or more condenser fans blow ambient room air to cool the condenser, removing heat energy from the refrigerant.
- both the condenser and evaporator fans are commanded on. Following a cooling on mode, the evaporator fan is typically left running to defrost the evaporator, but the time required to defrost the evaporator is usually shorter than the compressor off cycle that follows each on mode. Also, the operation of the evaporator fan motor itself adds heat to the refrigerated merchandiser cabinet. The problem is that operation of the evaporator fan beyond what is needed to defrost the evaporator wastes the energy needed to run the fan and needlessly adds heat to the refrigerated merchandiser, much of which ultimately ends up in the cooled storage space.
- a refrigeration apparatus having an evaporator fan motor control includes an evaporator to remove heat energy from the air in a cooled storage space.
- the evaporator transfers the heat energy to a refrigerant.
- At least one evaporator fan moves air from the cooled storage space across the evaporator to improve the transfer of heat energy into the refrigerant.
- the one or more evaporator fans have an energy consumption and generate a waste heat energy.
- a refrigeration control unit at least controls the operation of the one or more evaporator fans. During an off mode, the one or more evaporator fans are operated in a reduced energy consumption mode to reduce the energy consumption of the one or more evaporator fans and to reduce the waste heat while still defrosting the evaporator in the off mode.
- FIG. 1 shows a refrigerated merchandiser
- FIG. 1A shows a refrigerated merchandiser cassette
- FIG. 2 a block diagram including refrigeration electrical controls
- FIG. 3 shows an embodiment of evaporator fan control using two fan speeds
- FIG. 4 shows an embodiment of evaporator fan control using control of multiple fans
- FIG. 5 shows an embodiment of evaporator fan control based on defrosting
- FIG. 6 shows a graph of power consumption versus time for an evaporator fan control using two fan speeds
- FIG. 7 shows a table of energy savings for the evaporator fan control of FIG. 6 .
- FIG. 1 shows a refrigerated merchandiser 10 suitable for the system and method of inventive evaporator fan operation.
- Refrigerated merchandiser 10 can cool storage space 17 using the well known refrigeration cycle.
- Three of the major components used to carry out the refrigeration cycle are evaporator 14 (typically including an evaporator coil), condenser 16 , and compressor 18 .
- evaporator 14 typically including an evaporator coil
- condenser 16 condenser 16
- compressor 18 compressor
- one or more evaporator fans 13 draw air from interior storage space 17 over evaporator 14 removing heat from the air and returning cooler air to interior storage space 17 .
- a refrigerant circulated through evaporator 14 (not shown) is thus heated.
- the heated refrigerant is later cooled by condenser 16 working in conjunction with one or more condenser fans 15 to remove heat from the refrigerant and dissipate it into a flow of cooler ambient room air.
- the majority of the refrigeration components of refrigerated merchandiser 10 can be assembled into a refrigeration cassette 12 as shown in FIG. 1A .
- Refrigeration cassette 12 can be made conveniently removable from refrigerated merchandiser 10 for ease of servicing.
- Such an exemplary refrigerated merchandiser is explained in more detail in PCT/US05/33078, “Evaporator fan/motor assembly support bracket”, filed Sep. 16, 2005 and incorporated herein by reference in its entirety.
- FIG. 2 shows refrigeration controls (refrigeration control unit) 21 used to at least control the operation of one or more evaporator fan(s) 13 and typically to also control the one or more condenser fans 15 and the operation of compressor 18 .
- compressor 18 is powered and both evaporator fans 13 and condenser fans 15 are in operation.
- the compressor and condenser fans are turned off, but the evaporator fans continue to operate.
- evaporator fan operation is used to defrost evaporator coil 14 .
- the time required to defrost evaporator 14 is shorter than the compressor off cycle. Therefore the evaporator fan is running much longer than required.
- the heat added to refrigerated merchandiser by evaporator fan 13 is approximately 30% to 50% of the total cooling load of the merchandiser.
- power to evaporator fan(s) 13 can be reduced when full operation of the fan(s) 13 is not required during the off cycle to defrost evaporator coil 14 .
- the energy savings is two fold. First there are direct savings by the reduction in electrical power consumption by fan(s) 13 and secondly, fan(s) 13 create less waste heat that ultimately ends up in cooled storage space 17 because refrigeration cassette 12 is located in the merchandiser below cooled storage space 17 .
- the compressor is on and one or more evaporator fans 13 are operating at high speed.
- active cooling of storage space 17 ends when compressor 18 is shut off.
- the one or more evaporator fan(s) 13 are set by refrigeration controls 21 to a low speed.
- the low speed operation of evaporator fans 13 reduces the direct electrical energy needed to run the fan(s) 13 as well reduces the waste fan heat that is introduced into storage space 17 as a result of the heat energy generated by the operation of fan(s) 13 . It should be noted that while the electrical energy to fan(s) 13 is significantly lower during an off cycle, there is still sufficient air flow through evaporator 14 to defrost it.
- An additional improvement in efficiency can be gained by adding a third fan speed, such that the one or more evaporator fan(s) 13 are set by refrigeration controls 21 to a third higher fan speed, during an initial cool down period (“pull down”) of storage space 17 .
- the third higher fan speed can be especially useful during high refrigeration loading situations, such as when new products are added to refrigerated merchandiser 10 .
- One method to detect the addition of newly added products is to detect a temperature rise in storage space 17 .
- the compressor is on and N evaporator fans 13 are operating at an operating speed.
- active cooling of storage space 17 ends when compressor 18 is shut off.
- the one or more (M) evaporator fans 13 are turned off leaving (N ⁇ M) fans still running at the operating speed.
- the reduced number of operating evaporator fan(s) 13 reduces the direct electrical energy needed to run the remaining (N ⁇ M) fan(s) 13 as well reducing the amount of waste fan heat introduced into storage space 17 as compared to the heat energy generated by the operation of N fan(s) 13 . It should be noted that while the electrical energy to fan(s) 13 is significantly lower during an off cycle, there is still sufficient air flow through evaporator 14 to defrost it.
- An additional improvement in efficiency can be gained by adding additional fans P, such that (N+P) fan(s) evaporator fan(s) 13 are turned on by refrigeration controls 21 , during an initial cool down period (“pull down”) of storage space 17 .
- the additional airflow caused by the operation of (N+P) fan(s) evaporator fan(s) 13 can be especially useful during high refrigeration loading situations, such as when new products are added to refrigerated merchandiser 10 .
- FIG. 5 in yet another embodiment of the invention, shown in FIG. 5 , during a cooling on cycle, the compressor is on and N evaporator fan(s) 13 are operating at an operating speed.
- active cooling of storage space 17 ends when compressor 18 is shut off.
- the one or more evaporator fan(s) 13 are still running at the operating speed until the temperature of evaporator 14 rises to a level indicating that evaporator 14 is defrosted, or some other method of defrost detection as known in the art indicates that evaporator 14 defrosted.
- One way to detect a defrost condition at evaporator 14 is by temperature sensing to determine when the temperature of evaporator 14 has risen a predetermined amount above the freezing point of water as can be accomplished using temperature sensors, including bimetal switch, bimetallic sensor, thermistors, resistance temperature devices (RTDs), thermocouples, and infrared (IR) sensors.
- temperature sensors including bimetal switch, bimetallic sensor, thermistors, resistance temperature devices (RTDs), thermocouples, and infrared (IR) sensors.
- refrigeration controls 21 can comprise electromechanical switches, relays, or contactors to control fan(s) 14 , fan(s) 15 , and compressor 18 .
- Fan speeds can also be set by using multi-speed fans with dedicated power leads for each fan speed, or by a passive or active electronic fan speed control.
- Power semiconductor switches including SCRs, TRIACs, transistors, FETs, MOSFETs, and insulated gate bipolar transistors (IGBTs) can also be used for both on-off power controls as well as being used in electronic fan speed controls.
- Refrigeration controls 21 can also comprise a microcontroller, microcomputer, logic board using standard function digital logic chips or programmable logic elements, including gate arrays, programmable gate arrays, field programmable gate arrays (FPGA), ASICs, or other suitable electronic controls including a programmable logic controller (PLC).
- programmable logic controller PLC
- refrigeration controls 21 will comprise a mix of both digital electronic control elements and power electrical switching elements as described above.
- Suitable fan types include propeller blade fans, blowers, and squirrel cage fans.
- inventive method and apparatus for controlling evaporator fan operation in refrigerated merchandisers is not limited to refrigerated merchandisers and can more generally be applied to other types of refrigeration equipment.
- the graph of FIG. 6 shows a comparison of standard operation of refrigerated merchandiser according to the prior art compared to operation of the evaporator fans at a reduced speed during the off mode according to the invention.
- the graph is a plot of electrical power consumption (in Watts) plotted versus relative units of time, such as numbered sample points (on a scale of 0 to 1200).
- the solid curve shows the power consumption of an exemplary refrigerated merchandiser operated with the evaporator fans always on at a single fixed motor speed.
- FIG. 7 is a table that shows the cost savings achieved by the reduced need for electrical power by a refrigerated merchandiser operated according to the invention. In this simulation example, it can be seen that with an overall 2.8% reduction in energy consumption, a cost savings of approximately $6 per year or at least $73 can be achieved over a 12 year product life cycle.
Abstract
Description
- This invention relates generally to a method and apparatus for the operation of evaporator fans and more particularly to the operation of evaporator fans in refrigerated merchandisers.
- Merchants of refrigerated beverages, snacks, and perishable foods typically use refrigerated merchandisers to market these products. Refrigerated merchandisers generally comprise a cooled storage space with shelves and a compressor, an evaporator, and a condenser to carry out a refrigeration cycle to cool the storage space. One or more evaporator fans blow storage space air over an evaporator, typically transferring heat energy from the storage space air to a circulating refrigerant in the evaporator coil to facilitate the refrigeration process. Also, one or more condenser fans blow ambient room air to cool the condenser, removing heat energy from the refrigerant.
- When the refrigerator is actively cooling the storage space in an “on mode”, both the condenser and evaporator fans are commanded on. Following a cooling on mode, the evaporator fan is typically left running to defrost the evaporator, but the time required to defrost the evaporator is usually shorter than the compressor off cycle that follows each on mode. Also, the operation of the evaporator fan motor itself adds heat to the refrigerated merchandiser cabinet. The problem is that operation of the evaporator fan beyond what is needed to defrost the evaporator wastes the energy needed to run the fan and needlessly adds heat to the refrigerated merchandiser, much of which ultimately ends up in the cooled storage space.
- Therefore, there is a need for an evaporator motor control that can reduce evaporator fan motor energy consumption during the compressor off cycle.
- A refrigeration apparatus having an evaporator fan motor control includes an evaporator to remove heat energy from the air in a cooled storage space. The evaporator transfers the heat energy to a refrigerant. At least one evaporator fan moves air from the cooled storage space across the evaporator to improve the transfer of heat energy into the refrigerant. The one or more evaporator fans have an energy consumption and generate a waste heat energy. A refrigeration control unit at least controls the operation of the one or more evaporator fans. During an off mode, the one or more evaporator fans are operated in a reduced energy consumption mode to reduce the energy consumption of the one or more evaporator fans and to reduce the waste heat while still defrosting the evaporator in the off mode.
- For a further understanding of these and objects of the invention, reference will be made to the following detailed description of the invention which is to be read in connection with the accompanying drawing, where:
-
FIG. 1 shows a refrigerated merchandiser; -
FIG. 1A shows a refrigerated merchandiser cassette; -
FIG. 2 a block diagram including refrigeration electrical controls; -
FIG. 3 shows an embodiment of evaporator fan control using two fan speeds; -
FIG. 4 shows an embodiment of evaporator fan control using control of multiple fans; -
FIG. 5 shows an embodiment of evaporator fan control based on defrosting; -
FIG. 6 shows a graph of power consumption versus time for an evaporator fan control using two fan speeds; and -
FIG. 7 shows a table of energy savings for the evaporator fan control ofFIG. 6 . -
FIG. 1 shows a refrigeratedmerchandiser 10 suitable for the system and method of inventive evaporator fan operation. Refrigeratedmerchandiser 10 can coolstorage space 17 using the well known refrigeration cycle. Three of the major components used to carry out the refrigeration cycle are evaporator 14 (typically including an evaporator coil),condenser 16, andcompressor 18. In operation (the “on mode”) one ormore evaporator fans 13 draw air frominterior storage space 17 overevaporator 14 removing heat from the air and returning cooler air tointerior storage space 17. A refrigerant circulated through evaporator 14 (not shown) is thus heated. The heated refrigerant is later cooled bycondenser 16 working in conjunction with one ormore condenser fans 15 to remove heat from the refrigerant and dissipate it into a flow of cooler ambient room air. The majority of the refrigeration components of refrigeratedmerchandiser 10 can be assembled into arefrigeration cassette 12 as shown inFIG. 1A .Refrigeration cassette 12 can be made conveniently removable from refrigeratedmerchandiser 10 for ease of servicing. Such an exemplary refrigerated merchandiser is explained in more detail in PCT/US05/33078, “Evaporator fan/motor assembly support bracket”, filed Sep. 16, 2005 and incorporated herein by reference in its entirety. -
FIG. 2 shows refrigeration controls (refrigeration control unit) 21 used to at least control the operation of one or more evaporator fan(s) 13 and typically to also control the one ormore condenser fans 15 and the operation ofcompressor 18. During a refrigeration cooling cycle (“on mode”),compressor 18 is powered and bothevaporator fans 13 andcondenser fans 15 are in operation. In conventional operation, at the end of a refrigeration cycle (“off mode”), the compressor and condenser fans are turned off, but the evaporator fans continue to operate. During the off mode, evaporator fan operation is used to defrostevaporator coil 14. However, in most instances, the time required to defrostevaporator 14 is shorter than the compressor off cycle. Therefore the evaporator fan is running much longer than required. - The heat added to refrigerated merchandiser by
evaporator fan 13 is approximately 30% to 50% of the total cooling load of the merchandiser. According to the invention, power to evaporator fan(s) 13 can be reduced when full operation of the fan(s) 13 is not required during the off cycle todefrost evaporator coil 14. The energy savings is two fold. First there are direct savings by the reduction in electrical power consumption by fan(s) 13 and secondly, fan(s) 13 create less waste heat that ultimately ends up in cooledstorage space 17 becauserefrigeration cassette 12 is located in the merchandiser below cooledstorage space 17. - According to a preferred embodiment of the invention, as shown in
FIG. 3 , during a cooling on cycle, the compressor is on and one ormore evaporator fans 13 are operating at high speed. At the completion of the on cycle, active cooling ofstorage space 17 ends whencompressor 18 is shut off. During the off cycle, the one or more evaporator fan(s) 13 are set by refrigeration controls 21 to a low speed. The low speed operation ofevaporator fans 13 reduces the direct electrical energy needed to run the fan(s) 13 as well reduces the waste fan heat that is introduced intostorage space 17 as a result of the heat energy generated by the operation of fan(s) 13. It should be noted that while the electrical energy to fan(s) 13 is significantly lower during an off cycle, there is still sufficient air flow throughevaporator 14 to defrost it. - An additional improvement in efficiency (not shown in
FIG. 3 ) can be gained by adding a third fan speed, such that the one or more evaporator fan(s) 13 are set byrefrigeration controls 21 to a third higher fan speed, during an initial cool down period (“pull down”) ofstorage space 17. The third higher fan speed can be especially useful during high refrigeration loading situations, such as when new products are added to refrigeratedmerchandiser 10. One method to detect the addition of newly added products is to detect a temperature rise instorage space 17. - In another embodiment of the invention, shown in
FIG. 4 , during a cooling on cycle, the compressor is on andN evaporator fans 13 are operating at an operating speed. At the completion of the on cycle, active cooling ofstorage space 17 ends whencompressor 18 is shut off. During the off cycle, the one or more (M)evaporator fans 13 are turned off leaving (N−M) fans still running at the operating speed. The reduced number of operating evaporator fan(s) 13 reduces the direct electrical energy needed to run the remaining (N−M) fan(s) 13 as well reducing the amount of waste fan heat introduced intostorage space 17 as compared to the heat energy generated by the operation of N fan(s) 13. It should be noted that while the electrical energy to fan(s) 13 is significantly lower during an off cycle, there is still sufficient air flow throughevaporator 14 to defrost it. - An additional improvement in efficiency (not shown in
FIG. 4 ) can be gained by adding additional fans P, such that (N+P) fan(s) evaporator fan(s) 13 are turned on byrefrigeration controls 21, during an initial cool down period (“pull down”) ofstorage space 17. The additional airflow caused by the operation of (N+P) fan(s) evaporator fan(s) 13 can be especially useful during high refrigeration loading situations, such as when new products are added torefrigerated merchandiser 10. - In yet another embodiment of the invention, shown in
FIG. 5 , during a cooling on cycle, the compressor is on and N evaporator fan(s) 13 are operating at an operating speed. At the completion of the on cycle, active cooling ofstorage space 17 ends whencompressor 18 is shut off. During the off cycle, the one or more evaporator fan(s) 13 are still running at the operating speed until the temperature ofevaporator 14 rises to a level indicating thatevaporator 14 is defrosted, or some other method of defrost detection as known in the art indicates thatevaporator 14 defrosted. One way to detect a defrost condition atevaporator 14 is by temperature sensing to determine when the temperature ofevaporator 14 has risen a predetermined amount above the freezing point of water as can be accomplished using temperature sensors, including bimetal switch, bimetallic sensor, thermistors, resistance temperature devices (RTDs), thermocouples, and infrared (IR) sensors. When it is detected thatevaporator 14 is defrosted, evaporator fan(s) 13 can be turned off by refrigeration controls 21. - It should be noted that refrigeration controls 21 can comprise electromechanical switches, relays, or contactors to control fan(s) 14, fan(s) 15, and
compressor 18. Fan speeds can also be set by using multi-speed fans with dedicated power leads for each fan speed, or by a passive or active electronic fan speed control. Power semiconductor switches including SCRs, TRIACs, transistors, FETs, MOSFETs, and insulated gate bipolar transistors (IGBTs) can also be used for both on-off power controls as well as being used in electronic fan speed controls. Refrigeration controls 21 can also comprise a microcontroller, microcomputer, logic board using standard function digital logic chips or programmable logic elements, including gate arrays, programmable gate arrays, field programmable gate arrays (FPGA), ASICs, or other suitable electronic controls including a programmable logic controller (PLC). Typically refrigeration controls 21 will comprise a mix of both digital electronic control elements and power electrical switching elements as described above. - It should also be noted that any type of fan suitable to move air across
evaporator 14 can be used to practice off cycle energy savings afforded by the various embodiments of the invention. Suitable fan types include propeller blade fans, blowers, and squirrel cage fans. - It should be noted that the inventive method and apparatus for controlling evaporator fan operation in refrigerated merchandisers is not limited to refrigerated merchandisers and can more generally be applied to other types of refrigeration equipment.
- A simulation of the preferred embodiment where evaporator fan speed is reduced during the cooling off mode was carried out. The graph of
FIG. 6 shows a comparison of standard operation of refrigerated merchandiser according to the prior art compared to operation of the evaporator fans at a reduced speed during the off mode according to the invention. The graph is a plot of electrical power consumption (in Watts) plotted versus relative units of time, such as numbered sample points (on a scale of 0 to 1200). The solid curve shows the power consumption of an exemplary refrigerated merchandiser operated with the evaporator fans always on at a single fixed motor speed. The dotted curve, overlapping the solid curve during common operation over the on cycle, shows the dramatic power savings with a two speed evaporator motor dropped to a low speed during the off mode.FIG. 7 is a table that shows the cost savings achieved by the reduced need for electrical power by a refrigerated merchandiser operated according to the invention. In this simulation example, it can be seen that with an overall 2.8% reduction in energy consumption, a cost savings of approximately $6 per year or at least $73 can be achieved over a 12 year product life cycle. - The power and cost figures of the example are merely an illustration of one simulated case and do not reflect any limits on the potential energy saving possible using any of the aforementioned embodiments of the invention.
- While the present invention has been particularly shown and described with reference to the preferred mode as illustrated in the drawing, it will be understood by one skilled in the art that various changes in detail may be effected therein without departing from the spirit and scope of the invention as defined by the claims.
Claims (19)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/US2006/019756 WO2007136374A1 (en) | 2006-05-22 | 2006-05-22 | Evaporator fan motor control in a refrigerated merchandiser |
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US20100242506A1 true US20100242506A1 (en) | 2010-09-30 |
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US12/301,892 Abandoned US20100242506A1 (en) | 2006-05-22 | 2006-05-22 | Evaporator fan motor control in a refrigerated merchandiser |
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WO (1) | WO2007136374A1 (en) |
Cited By (7)
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US20090104016A1 (en) * | 2007-10-22 | 2009-04-23 | Delta Electronics Components (Dongguan) Co., Ltd. | Control Circuit and Fan Comprising the Same |
US20110126570A1 (en) * | 2008-05-23 | 2011-06-02 | Aktiebolaget Electrolux | Cold appliance |
WO2013188079A1 (en) * | 2012-06-12 | 2013-12-19 | Hussmann Corporation | Control system for a refrigerated merchandiser |
US20140305610A1 (en) * | 2013-04-16 | 2014-10-16 | Hamilton Sundstrand Corporation | Method of monitoring a heat exchanger arrangement and heat exchanger monitoring system |
US9160269B2 (en) | 2013-03-01 | 2015-10-13 | Regal Beloit America, Inc. | Motor assembly with integrated on/off detection with speed profile operation |
WO2015179009A3 (en) * | 2014-03-13 | 2016-01-21 | True Manufacturing Company, Inc. | Internal control systems of evaporator and condenser fan motor assemblies of a refrigeration system in a refrigerator unit |
CN109707657A (en) * | 2019-02-26 | 2019-05-03 | 澳柯玛股份有限公司 | A kind of refrigerated display cabinet for the rotation speed of fan that is self-regulated |
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US10429122B2 (en) | 2017-01-24 | 2019-10-01 | Kysor Warren Epta Us Corporation | Method and apparatus for enhanced off-cycle defrost |
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US6138460A (en) * | 1998-09-02 | 2000-10-31 | Samsung Electronics Co., Ltd. | Temperature control apparatus for refrigerator and control method therefor |
US6032471A (en) * | 1998-10-31 | 2000-03-07 | Daewoo Electronics Co., Ltd. | Defrost control method for use in a refrigerator |
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US20090104016A1 (en) * | 2007-10-22 | 2009-04-23 | Delta Electronics Components (Dongguan) Co., Ltd. | Control Circuit and Fan Comprising the Same |
US20110126570A1 (en) * | 2008-05-23 | 2011-06-02 | Aktiebolaget Electrolux | Cold appliance |
WO2013188079A1 (en) * | 2012-06-12 | 2013-12-19 | Hussmann Corporation | Control system for a refrigerated merchandiser |
US9964350B2 (en) | 2012-06-12 | 2018-05-08 | Hussmann Corporation | Control system for a refrigerated merchandiser |
US10330369B2 (en) | 2012-06-12 | 2019-06-25 | Hussmann Corporation | Control system for a refrigerated merchandiser |
US9160269B2 (en) | 2013-03-01 | 2015-10-13 | Regal Beloit America, Inc. | Motor assembly with integrated on/off detection with speed profile operation |
US20140305610A1 (en) * | 2013-04-16 | 2014-10-16 | Hamilton Sundstrand Corporation | Method of monitoring a heat exchanger arrangement and heat exchanger monitoring system |
US9784508B2 (en) * | 2013-04-16 | 2017-10-10 | Hamilton Sundstrand Corporation | Method of monitoring a heat exchanger arrangement and ram air fan in an aircraft to prevent stall conditions |
WO2015179009A3 (en) * | 2014-03-13 | 2016-01-21 | True Manufacturing Company, Inc. | Internal control systems of evaporator and condenser fan motor assemblies of a refrigeration system in a refrigerator unit |
CN109707657A (en) * | 2019-02-26 | 2019-05-03 | 澳柯玛股份有限公司 | A kind of refrigerated display cabinet for the rotation speed of fan that is self-regulated |
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