REFRIGERATION SYSTEM FOR AN ICE SKATING RINK
A refrigeration system for an outdoor ice skating rink includes a first heat exchanger that has a first conduit therein and is located outdoors. The first conduit has a first inlet and a first outlet and is configured to discharge heat to the outdoor ambient air. The refrigeration system includes a second heat exchanger that has a second conduit therein, and is in thermal communication with water in the ice skating rink. The second conduit has a second inlet and a second outlet and is configured to absorb heat from the water. The second outlet is in fluid communication with the first inlet via a warm-side conduit. The first outlet is in fluid communication with the second inlet via a cold-side conduit. One or more conveying devices are located in a closed loop that includes the first and second conduits, the warm-side conduit, and the cold-side conduit.
This nonprovisional application claims the benefit of U.S. Provisional Application No. 63/299,457, filed on Jan. 14, 2022, the content of which is incorporated herein by reference in its entirety.
TECHNICAL FIELDThe present invention is directed to a refrigeration system for an ice skating rink that employs cold ambient air as the heat sink and utilizes a closed loop system for conveying a heat transfer fluid therein and that is configured to accelerate freezing of water in the ice skating rink.
BACKGROUNDIce hockey and ice skating in general are increasingly popular in cold climates. The demand for ice time is so high compared with supply in many regions that teams and other clubs/groups must rent ice time during very early morning hours or very late nighttime hours. Many programs, especially those run by public high schools have been forced to reduce practice ice time hours or even eliminate entire programs due to increased costs to obtain ice time, particularly in view of reduced budgets.
Traditionally, hockey players and other skaters have used frozen lakes or ponds on which to skate during the winter months. In addition, families, towns, and other associations have flooded fields or parking lots to form ice on which to skate. Skating on lakes and ponds can be extremely dangerous. Also, flooding a permeable field or lot is not feasible in regions where the ice will melt and then refreeze throughout the winter, as the water will drain once the ice intermittently melts.
There are presently many complicated methods for constructing an outdoor ice rink. These usually involve constructing some sort of perimeter inside of which an impermeable liner is optionally laid. This open-top container is then partially filled with water, which can freeze into ice in the rough shape of an ice rink provided that the ambient temperature is below the freezing point of water for a sufficient period of time. In some locations, the temperature drops below freezing for a relatively short period of time such as during the nighttime hours. Moreover, the time to freeze the water in the ice skating rink is directly proportional to the water depth and total volume of water in the rink. In addition, the substrate that the rink is constructed on acts as a heat sink that can cause the ice to melt and/or to delay the freezing process.
There are various refrigeration systems that are designed to freeze water in an ice skating rink. However, the prior art systems generally employ refrigerant loops with compressors, vaporizers, condensers, and expansion valves. Such prior art systems utilize ammonia-based refrigerants, freon, R-22, R-404A, & R-134a freon replacements. However, such refrigerants can be hazardous to the environment. In addition, the prior art refrigeration systems for freezing water in an ice skating rink are very complex, difficult to operate, and typically require professional technicians to maintain and operate.
It is apparent from the above that there is a need for an improved refrigeration system that can be used with portable, free-standing outdoor skating rinks.
SUMMARYThe present invention according to an embodiment includes a refrigeration system for an outdoor ice skating rink which includes a first heat exchanger that has a first conduit therein and is located outdoors. The first conduit has a first inlet and a first outlet and is configured to discharge heat to the outdoor ambient air. The refrigeration system includes a second heat exchanger that has a second conduit therein, and that is in thermal communication with water in the ice skating rink. The second conduit has a second inlet and a second outlet and is configured to absorb heat from the water. The second outlet is in fluid communication with the first inlet via a warm-side conduit. The first outlet is in fluid communication with the second inlet via a cold-side conduit. One or more conveying devices (e.g., pumps) are located in a closed loop that includes the first and second conduits, the warm-side conduit and the cold-side conduit.
In some embodiments, the refrigeration system includes a convection device (e.g., fan or blower driven by a drive unit) that is in thermally conductive communication with the first conduit for accelerating discharge of heat from the first conduit.
In some embodiments, the fluid conveying device is located in the warm-side conduit and/or in the cold-side conduit.
In some embodiments, the ice skating rink includes an impermeable liner and the second conduit is positioned between the liner and a substrate upon which the ice skating rink is situated and/or above the liner and submerged in the water contained by the impermeable liner.
In some embodiments, the second conduit comprises a web structure connected to adjacent segments of the second conduit.
In some embodiments, the impermeable liner and the second conduit are integrally formed with one another.
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In some embodiments the fluid conveying device 60, 60′ is a pump that has a first drive unit 65, 65′, respectively, attached thereto for causing the pump to operate. In some embodiments, the first drive units 65, 65′ are connected to a power supply 83, 83′, respectively, such as a battery, portable generator, or alternating current line supply.
In some embodiments, the refrigeration system 100 includes a convection device 70 (e.g., a fan or blower 71 driven by a second drive unit 72) that is in thermally conductive communication with the first conduit 22 for accelerating discharge of heat from the first conduit 22. In some embodiments, the second drive unit 72 is connected to a power supply 73, such as a battery, portable generator, or alternating current line supply. The convection device 70 conveys cold ambient air that is at a temperature less that zero degrees Celsius (less than 32 degrees Fahrenheit) over outside surfaces of the first conduit 22 thereby decreasing the temperature of the heat transfer fluid flowing through the first conduit 22.
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In some embodiments, the heat transfer fluid is a liquid that has an anti-freeze therein to lower the freezing point of the heat transfer fluid. The refrigeration system does not employ any freon refrigerant and does not require a compressor and expansion valve typically used in refrigeration systems. The anti-freeze is an environmentally friendly substance such as a vegetable based anti-freeze that includes vegetable extracts that are non-toxic, biodegradable, and more thermally efficient than Propylene Glycol based coolants.
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Although this invention has been shown and described with respect to the detailed embodiments thereof, it will be understood by those of skill in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed in the above detailed description, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims
1. A refrigeration system for an outdoor ice skating rink, the refrigeration system comprising:
- a first heat exchanger having first conduit therein, the first heat exchanger being located in outdoor ambient air, the first conduit having a first inlet and a first outlet, the first heat exchanger being configured to discharge heat to the outdoor ambient air;
- a second heat exchanger having a second conduit therein, the second conduit being in thermal communication with water in the ice skating rink, the second conduit having a second inlet and a second outlet, the second heat exchanger being configured to absorb heat from the water;
- the second outlet being in fluid communication with the first inlet via a warm-side conduit;
- the first outlet being in fluid communication with the second inlet via a cold-side conduit; and
- at least one fluid conveying device located in a closed loop comprising the first conduit, the second conduit, the warm-side conduit and the cold-side conduit, the at least one fluid conveying device being configured to circulate a heat transfer fluid in the closed loop.
2. The refrigeration system of claim 1, further comprising a convection device in thermally conductive communication with the first conduit for accelerating discharge of heat from the first conduit.
3. The refrigeration system of claim 1, wherein the at least one fluid conveying device is located in at least one of:
- (a) the warm-side conduit; and
- (b) the cold-side conduit.
4. The refrigeration system of claim 1, wherein the at least one fluid conveying device comprises a pump driven by a first drive unit.
5. The refrigeration system of claim 2, wherein the convection device comprises a fan or blower driven by a second drive unit.
6. The refrigeration system of claim 1, wherein the ice skating rink comprises an impermeable liner, and the second conduit is positioned between the liner and a substrate upon which the ice skating rink is situated.
7. The refrigeration system of claim 1, wherein the ice skating rink comprises an impermeable liner, and the second conduit is positioned above the liner and submerged in the water contained by the impermeable liner.
8. The refrigeration system of claim 1, wherein the second conduit comprises a web structure connected to adjacent sections of segments of the second conduit.
9. The refrigeration system of claim 1, wherein the second conduit comprises a serpentine shape with a flat flow passage cross-section.
10. The refrigeration system of claim 1, wherein the ice skating rink comprises an impermeable liner and the second conduit is integral with the liner.
Type: Application
Filed: Jan 9, 2023
Publication Date: Jul 20, 2023
Inventor: Dylan Gastel (Auburndale, MA)
Application Number: 18/094,480