FIELD OF THE INVENTION:
[001] The present invention relates to an evaporative air cooler and more particularly to a sleep mode / comfort mode control apparatus and method of an air cooling for providing an optimum sleeping environment to a user.
BACKGROUND OF THE INVENTION:
[002] The conventional evaporative air coolers are used only for cooling, through the use of pump, fan and cooling media which is honeycomb pads or wood-wool. These coolers generally have three functions like Pump - ON / OFF, Fan Speed - High/Medium/Low & Swing - ON / OFF .
[003] The conventional (existing) air coolers do not have the provision of automatically controlling the functioning of Pump & Fan in the air cooler during sleeping hours when ambient temperature goes down & user feels cold during sleep. Prolonged operation of the air cooler at a pre-defined settings may not be desirable. As occupants of a room sleep, their bodily functions slow down, causing a drop-in body temperature. The air cooler operating continues to discharge cool air into the room when the cool air is not needed. The operation of the air cooler at the pre-defined settings during a period of time when cool air is not needed leads to wasted electrical energy and discomfort to those sleeping in the room. Generally during the early hours of the morning, the user has to either reduce the fan speed & switch off the pump or switch off the cooler to feel comfortable and not feel too much cold. The user needs to get up from sleep & switch off the pump or change the fan speed of air cooler according to his/her requirement. The current available coolers do not have the Sleep Mode / Comfort Mode where Cooling & Fan Controls can be automatically adjusted as per a preset program.
[004] While the air cooler is usually operated between on and off states, the control portion allows the fan to be operated at a number preprogrammed fan speed settings that are

selectable depending on the degree of cooling desired. In hot environments such as a room having windows through which sunlight directly enters the room, a first, high setting can be selected to operate the fan motor near its maximum speed. When a minimal amount of cooling is desired, the control adjusted portion can be to operate the fan motor at a second, low speed. Similarly, in moderate temperature environments, the control portion can be adjusted to another discrete, mid level setting to operate the fan motor at an intermediate speed between the maximum and minimum speeds. Adjustment between the fan motor speed is sudden and requires the user to select one of the preprogrammed speeds, which are often too fast or too slow to satisfy particular cooling demands.
[005] Existing air coolers allows the user to control the fan speed manually but does not provide any automatic control of the fan speed or cooling through water pump operation for controlling the water flow. The speed of water flow through water pump cannot be controlled automatically but water pump can only be switched on or off.
[006] Such a cooling device is disclosed in US7784293B2. Said invention relates to an air handling system for cooling and/or heating a room includes a sleep mode. The system includes a fan assembly to transport air from the system into the room. A user interface transmits a sleep mode signal upon activation of the sleep mode by a user. A control unit controls the climate control unit to gradually change an ambient temperature in the room over a predetermined period of time in response to the sleep mode signal transmitted by the user interface. Further, the fan assembly has a substantially continuously adjustable speed within a range of speeds defined by a predetermined upper limit and a predetermined lower limit. The control unit adjusts the speed of the fan assembly according to a desired speed of the fan assembly input via the user interface. A multi-position switch defines the predetermined upper and lower limits.
[007] Such a cooling device is disclosed in KR20070076311A. Said invention relates to an apparatus and a method of controlling a sleeping mode of an air conditioner are provided to reduce energy consumption by decreasing the number of times of operations

of a compressor, an indoor unit fan, and a discharging blade by controlling an indoor temperature by 1°C. An apparatus of controlling a sleeping mode of an air conditioner comprises a control unit(102), a timer, a user input unit(104), an indoor temperature sensor(106), a compressor(108), an indoor unit fan(llO), and a discharging blade(112). The control unit includes the timer and controls the entire operation of the air conditioner. The user input unit inputs various setting values such as an operation mode and an intended temperature. The indoor temperature sensor detects an indoor temperature. The user input unit and the indoor temperature sensor are connected to an input unit of the controller. The control unit controls the sleeping mode to implement a sleeping entering step, a heavy sleeping step, and a rising mode.
[008] Such a cooling device is disclosed in non-patent literature titled "EVAPORATIVE AIR COOLER INSTRUCTION MANUAL". Said literature discloses a High-grade computer-controlled system with LED panel; Remote control; Functions include: Cool fan, humidifier and air filtration; Dust filter captures dust and pollen; Honeycomb pad enhances cooling performance; Energy saving and effective, only uses 65 W of power; 3 fan speeds: High - Medium - Low; Large water tank capacity and high air volume; Up to 12 hours off-timer.
[009] The cooling devices as described in the prior art do not have the provision of automatically controlling the functioning of the pump and the fan during sleeping hours when ambient temperature gets down and the user feels cold during sleep, as per the requirement of the user.
OBJECTS OF THE INVENTION:
[010] The objective of the present invention is to design an air cooling device that provides the feature of sleep mode/ comfort mode option to automatically control the fan speed and water pump operation for creating an optimal temperature in the surroundings and causing comfort and convenience to the user.

[Oil] The instant invention achieves the objective by designing an air cooling device that automatically reduces the cooling and speed of the fan through an electronic circuit thereby optimizing the water and electricity consumption.
SUMMARY OF THE INVENTION:
[012] According to an embodiment of the present invention, there is provided an air cooler with sleep mode/ comfort mode option where cooling and fan controls are automatically adjusted as per a preset program. The user sets a mode in which cooler automatically reduces cooling & fan speed after running for preset hours. This provides the convenience to the user by automatically providing the adjustment/reduction in cooling & Air thrust from the air cooler without any manual intervention, once the Sleep mode / comfort mode is set as active.
[013] According to an embodiment of the present subject matter described herein, an apparatus and method of an evaporative air cooler with sleep mode / comfort mode option is described. The air cooler sleep mode / comfort mode feature automatically controls the cooling and fan speed for providing optimum sleeping environment to the user.
[014] The air cooler comprises of Motor, Pump, Front grill, Side grills, Control panel, Tank, top cover. The Tank capacity varies from lOltr to 1201tr and the cooling media used inside the cooler is Wood Wool or Honeycomb. The Controls panel is PCB (electronic) assisted. The air delivery mode is through Fan blade or Blower assisted. The body material of the air cooler is either Plastics & Metal. It is fitted with or without castor wheels for its mobility and depending upon the needs of the customer. The air current is deflected in four directions. It has a water level indicator to indicate the level of water in the tank. The Remote control and Mosquito /net filter are optional.
[015] The air cooler comprises an in-built logic in the cooler PCB (electronic circuit) and give the user a convenience of not manually switching off the cooler in the early hours of

the morning. The cooler, due to this feature, automatically reduce the cooling intensity and speed over a certain period of time (hours) so that the user feels comfortable rather than feeling too much cold. The user activates the sleep mode / comfort mode option provided in the air cooler for a preset period of time. Once the sleep mode / comfort mode gets activated, the electronic circuit sends the signal and automatically adjusts/reduces the fan speed and water flow of the water pump to reduce the cooling effect of the air cooler. Hence, it provides auto adjustment in cooling as high, mid and low by automatically controlling pump ON/OFF mode and fan speed by switching to next level of speed after a set period of time. This provides convenience to the user by providing the adjustment/reduction in cooling and air thrust from the air cooler without any manual intervention, once the sleep mode / comfort mode is set as active.
[016] This system and method of the present invention allows the user to control the running time of the pump and speed of the fan as per preset mode. As a result, the user feels comfort as there is no need for him to get up from bed during sleep. This feature also optimizes the water and electricity consumption of the air cooler.
[017] The unique feature of sleep mode gives convenience to the user by automatically providing the adjustment/reduction in cooling and air thrust from the air cooler without any manual intervention, once the sleep mode is set as active. The different parameters of sleep mode are:

[018] The Electronic Control Panel as described in Figure 2 provides with the following
features:
ON/OFF- Power ON/OFF
SPEED - Setting fan speed to High / Medium / Low
SWING - ON/OFF the vertical louver movement
MODES - Setting Cooling level to High/Medium/Low/Off
TFMER - Setting the timer from 1 Hour to 7 Hour
SERVICE CALL - Registering a service call by touch for 5 second.
TANK EMPTY INDICATOR - As the tank get empty alarm start beeping with Indication
& pump will automatically get OFF
SLEEP - To activate the Sleep mode by touching timer button for 3 second, all LED in panel will be half lit, Sleep mode can be deactivated by touching timer button once
BRIEF DESCRIPTION OF DRAWINGS:
[019] The other objects, features and advantages will occur to those skilled in the art from the following description of the preferred embodiment and the accompanying drawings.
[020] Figures 1 illustrate the various parts of the air cooler.
[021] Figure 2 illustrates the control panel of the air cooler.
[022] Reference to figures 1:
1. Cord Winder
2. Back Air Inlet Grill
3. Left Side Air Inlet Grill
4. Water Inlet
5. Top Panel
6. Air Outlet Grill

7. Front Panel
8. Water Tank
9. Water Level Indicator
10. Right Side Air Inlet Grill
11. Horizontal Louver
12. Castor Wheels

We Claim:
1. An air cooling device, said device comprising of:

1. a motor;
ii. a pump;
iii. a cord winder;
iv. front grill;
v. side grills;
vi. control panel;
vii. a water tank;
viii. a fan blade;
ix. cooling media; and
X. PCB;
characterized in that said air cooling device automatically reduces the cooling and speed of the fan through an electronic circuit thereby optimizing the water and electricity consumption.
2. The cooling device as claimed in Claim 1, wherein PCB of said cooling device comprises of an in-built logic whereby the cooling and speed of the fan is automatically controlled.
3. The cooling device as claimed in Claim 1, wherein the capacity of the tank of said cooling device ranges from 10L to 120L.

4. The cooling device as claimed in Claim 1, wherein said cooling device allows the user to control the running time of the pump and speed of the fan as per preset mode.