Portable cooled merchandizing unit
A portable cooled merchandising unit including a product container assembly and a thermoelectric assembly. The product container assembly includes an exterior frame and an interior container forming a floor and side panels defining an interior region. Openings to the interior region are defined opposite the floor. Airflow paths are defined at an exterior of the panels and are fluidly connected to the interior region via the opening. The thermoelectric assembly includes a thermoelectric device connected to a heat sink that is fluidly connected to the airflow path away from the opening. A fan is positioned to circulate air from the thermoelectric device and into the interior region via the airflow paths.
1. A method of cooling products in a display, the method comprising:
providing a merchandizing unit including an interior container having a floor and a first panel projecting upwardly from the floor, an interior face of the floor and an interior face of the panel combining to form a portion of an interior region, the merchandizing unit forming an airflow path along at least a portion of an exterior face of the panel to a first opening opposite the interior face of the floor;
fluidly connecting a first heat sink of a thermoelectric assembly to the airflow path, the first heat sink being coupled to a thermoelectric device;
placing multiple products on an interior face of the floor in the interior region;
powering the thermoelectric device with a pulse width modulated power supply to cool the first heat sink; and
operating a fan to circulate cooled air along the airflow path, through the first opening, and over products in the interior region.
2. The method of claim 1 , wherein the thermoelectric assembly further includes a second heat sink opposite the first heat sink, the method further comprising:
operating a second fan to convect heat from the second heat sink.
3. The method of claim 1 , wherein powering the thermoelectric device to cool the first heat sink includes:
controlling power delivered to the thermoelectric device based upon a temperature at the interior container to alter a temperature of cooled air delivered to the interior region.
4. The method of claim 1 , wherein a frequency of the pulsed power varies as a function of the temperature of the interior region to alter a temperature of cooled air delivered to the interior region.
5. The method of claim 4 , wherein powering the thermoelectric device includes:
providing pulsed power at a first frequency to the thermoelectric device to cool air to a first temperature;
determining that a temperature at the interior region is decreasing; and
providing pulsed power at a second frequency to the thermoelectric device in response to the determination to cool air to a second temperature greater than the first temperature, the second frequency being different from the first frequency.
6. The method of claim 4 , wherein powering the thermoelectric device includes:
providing pulsed power at a first frequency to the thermoelectric device to cool the interior region;
comparing a sensed temperature of the interior region to a predetermined value;
altering the pulsed power to a second frequency less than the first frequency in response to a determination that the sensed temperature is greater than a predetermined value; and
providing pulsed power at a third frequency greater than the first frequency in response to a determination that the sensed temperature is less than the predetermined value.
7. The method of claim 1 , wherein the interior container further includes a second panel projecting upwardly from the floor, the second panel having an interior face forming a portion of the interior region, the merchandizing unit further forming a return airflow path along at least a portion of an exterior of the second panel from a second opening opposite the floor, and further wherein the step of operating a fan to circulate cooled air further includes directing air from the interior region through the second opening, the return airflow path and to the first heat sink.
8. A method of cooling products in a display, the method comprising:
providing a merchandizing unit including an interior container having a floor and a panel combining to form a portion of an interior region, the merchandizing unit forming an airflow path along at least a portion of an exterior of the panel to an opening opposite the floor;
fluidly connecting a first heat sink of a thermoelectric assembly to the airflow path, the first heat sink being coupled to a thermoelectric device;
placing products in the interior region;
powering the thermoelectric device with a pulse width modulated power supply to cool the first heat sink; and
operating a fan to circulate cooled air along the airflow path and over products in the interior region;
wherein powering the thermoelectric device includes:
providing pulsed power at a first frequency to the thermoelectric device to cool the interior region,
comparing a sensed temperature of the interior region to a predetermined value,
altering the pulsed power to a second frequency less than the first frequency in response to a determination that the sensed temperature is greater than a predetermined value,
providing pulsed power at a third frequency greater than the first frequency in response to a determination that the sensed temperature is less than the predetermined value.
9. The method of claim 8 , wherein the step of operating a fan includes:
comparing a sensed temperature of the first heat sink with a predetermined heat sink set point; and
initiating operation of the fan when the sensed temperature of the first heat sink falls below the predetermined heat sink set point.