Field of the invention
The present invention relates to an air cooler having automatic variable cooling options. More particularly, the present invention relates to an evaporative air cooler enabling optimized consumption of water and electricity.

Background of the invention
The conventional air coolers available in the market perform the cooling by means of a pump, a fan and a cooling media including a honeycomb pad or wood-wool. Said coolers have the following functional features:
1. Pump: On/ Off
2. Fan Speed: High/ Medium/ Low
3. Swing: On/ Off

The conventional coolers cannot control the cooling capacity and either the cooling function is performed or not performed. Said coolers also require continuous use water and electricity for the purpose of performing cooling function.

Such a cooling system is disclosed in US7890215B2. Said invention relates to a cooling system for providing conditioned air to a facility includes a chiller or other cooling subsystem, a cooling tower subsystem and one or more air handling units or process cooling units. The cooling subsystem may advantageously include one or more chillers (e.g., variable speed chillers, constant speed chillers, absorption chillers, etc.) and chilled fluid pumps. The cooling tower subsystem includes one or more cooling tower units and condenser fluid pumps. In some implementations, the air handling unit has a cooling coil and a variable volume fan. In some implementations, direct expansion (DX) cooling systems comprise compressors, evaporators and air-cooled, water-cooled or evaporative-cooled condensing systems. Such systems can be controlled to reduce energy waste, improve occupant comfort and/or improve the thermal characteristics of the process cooling unit. The cooling system further comprises a control system which is configured to evaluate a cooling load value at the air handling unit and use the cooling load value to calculate at least one operational set point. The operational set point may advantageously be selected to improve the energy efficiency of the overall cooling system.

Such a cooling system is disclosed in US20070151278A1. Said invention relates to evaporative chiller cooling water to below ambient wet bulb temperature. Sub-wet bulb chilling is achieved by pre-cooling incoming air upstream of the saturator. The incoming air is ambient air at ambient air temperature that is cooled using the coolness of the lower temperature outgoing air exiting the saturator. The pre-cooling lowers the temperature of the incoming air and lowers its wet bulb temperature below that of ambient air. The saturator water is chilled to below the ambient wet bulb temperature. The air in the saturator flows across the water as it gravity drips or flows from the top to the bottom of the saturator. The pre-cooled air flows across the saturator with the coolest air directed across the bottom of the saturator where the coldest water is flowing and with the hottest air directed across the top where the hottest water is flowing to provide gradient chilling.

Such a cooling system has been disclosed in US6374780B1. Said invention relates to a method and apparatus for controlling engine temperature in a closed circuit cooling system 12 of an automobile 10 having an electric water pump 34, a flow control valve 42, and electric fan 40. A powertrain control module 20 electrically coupled to the electric water pump 34, flow control valve 42 and electric fan 40 interprets inputs from various sensors to adjust the pumping speed of an electric water pump 34, adjust the rotational speed of an electric fan 40, and/or adjust the flow rate through a flow control valve 42 to the radiator 46 according to a look up table as a function of fuel economy, emissions, thermal management and electrical load management.

Such a cooling system has been disclosed in CN201129823Y. Said invention relates to a central air-conditioning energy-saving control device which is based on artificial neural network technology, which relates to an energy-saving control device of a central air-conditioning system. The utility model provides a central air-conditioning energy-saving control device which is based on artificial neural network technology and whose energy saving is obvious, which comprises outdoor temperature, outdoor relative humidity, chilled-water water-supply temperature, chilled-water water-return temperature, chilled water inlet temperature, a chilled water outlet temperature sensor, a cooler load transducer, a chilled water flow gauge, a main-pipe differential pressure gauge of chilled water return water, a communication interface circuit, a micro-computer, a chilled water pump, a cooling water pump and a cooling tower draught fan frequency changer, wherein the outdoor temperature, outdoor relative humidity, chilled-water water-supply temperature, chilled-water water-return temperature, chilled water inlet temperature, the chilled water outlet temperature sensor, the chilled water flow gauge and the main-pipe differential pressure gauge of chilled water return water are connected with an analog quantity input module of the communication interface circuit, the communication interface is connected with the micro-computer, the chilled water pump, the cooling water pump, the cooling tower draught fan frequency changer and the cooler load transducer.

Such a cooling system has been disclosed in KR100893809B1. Said invention relates to an energy-saving type cooling system using the underground gushing water is provided to save the energy by using the underground gushing water and to control the underground gushing water supply with the fixed flow rate. An energy-saving type cooling system using the underground gushing water comprises: a ground water tank (110); a feed pump (122) providing the subsurface water of the ground water tank to a water pipe; a first cooling water pipe connected to the feed pump and supplying the first cooling water; one or more WCU (Water Cooling Unit) (130) cooling the indoor air; and a second cooling water pipe (P2) connected to WCU and supplying the second cooling water.

The cooling systems and air coolers described in the prior art do not have the provision for automatically controlling the functioning of the pump in the air cooler and hence requires continuous consumption of water and electricity while the pump is ON. Said coolers require manual intervention for the purpose of changing controlling the cooling of the coolers.

Objective of the Invention
The objective of the present invention is to design an evaporative air cooler that provides for automatic variable cooling option.
Yet another objective of the present invention is to design an evaporative cooler that enables optimized usage of water and electricity.
Yet another objective of the present invention is to design an evaporative air cooler that does not limit the options available to a user to have cooling or no cooling at all.
The instant invention achieves the objective by employing a cooling system in an evaporative air cooler thereby providing the user a control over the cooling as per the convenience of the user and saving water and electricity consumption.

Summary of the Invention
The present invention relates to an air cooler having automatic variable cooling options. More particularly, the present invention relates to an evaporative air cooler enabling optimized usage of water and electricity.

The instant invention provides for an evaporative air cooler that provides for varying cooling options to the user that range from high cooling to low cooling. Said feature also enables the control over the running time of the pump as per the cooling mode chosen. Hence, said additional feature of changing the intensity of cooling and controlling the working of the pump optimizes the consumption of water and electricity. Also, the variation in the cooling shall be performed automatically by way of an electronic circuit.

The features of the present invention include:
1. Cooling media including wood wool or honeycomb.
2. Controls including manual switch or PCB (electronic) assisted.
3. Air delivery by fan blade or blower assisted.
4. Body material including plastics and metal.
5. Mobility by means of castor wheels or without castor wheels.
6. Four way deflection.
7. Water level indicator.
8. Remote control – optional.
9. Mosquito /net filter – optional
10. Motor.
11. Pump.
12. Front grill.
13. Side grills.
14. Control panel.
15. Tank.
16. Top cover

According to a preferred embodiment of the instant invention, the following results are provided by the said air cooler under varied cooling conditions:
• High – Cooling Efficiency 60% (Pump Continues ON)
• Med – Cooling Efficiency 52% (Pump 60 Sec ON & 180 Sec OFF)
• Low - Cooling Efficiency 45% (Pump 60 Sec ON & 300 Sec OFF)

The Cooling efficiency at different option (Hi/Med/Lo) & Pump ON/OFF Operation is variable & this factor can be changed product wise, data given is only for reference.

Brief Description of the drawings

Figure 1 illustrates the components of said air cooler.
Figure 2 illustrates the features of the control panel.

Detailed Description of Drawings

The figure 1 depicts various components of the instant invention. The said view defines the components of the air cooler as follows:
i. ice chamber;
ii. back air inlet grill;
iii. left side air inlet grill;
iv. right side air inlet grill;
v. horizontal louver adjust knob;
vi. water inlet;
vii. top panel;
viii. electronic control panel;
ix. front panel;
x. air outlet grill;
xi. water level indicator;
xii. water tank; and
xiii. castor wheels.

Figure 2 of the instant invention describes the control panel and the features of the same. The unique feature of the variable cooling of the control panel provides comfort of changing the cooling to High, Medium or Low levels, that assists in having flexibility to change cooling levels and control humidity. Said results in less consumption of electricity and water. The cooling may be set to high, medium and low level wherein under high cooling condition C3 will display and high LED will glow; under medium cooling condition C2 will display and medium LED will glow; and under low cooling condition C1 will display and low LED will glow.

Said electronic control panel comprises of the following features:
• Dual digital display with 10 LED indicators;
• Fan speed control – high, medium and low;
• Timer may set up from 1-7 hours;
• Cooling may be set on high, medium and low;
• Tank empty – an empty tank sounds off the alarm;
• Power – On/ Off;
• Swing – for the purpose of vertical louver movement;
• Buzzer – employed as an alarm whenever the tank is empty.
A 2-digit display panel indicates the following functions:
• F3, F2 and F1 indicates the speed of the fan;
• C3, C2 and C1 indicates the cooling level;
• The cooling display is active for 5 seconds and automatically switches to display the fan speed, as default.
• H1 – H7 indicates the timer value.

The 10 LED on the electronic panel indicates the following functions:
• Power indicates the power on/ off status.
• Swing indicates the working mode of the swing motor.
• Cooling indicates the cooling status high, medium and low.
• Tank empty alarm indicates the tank empty status.
• Speed indicates the fan speed.
• Timer indicates the time status.

Other PCB Functions shown are indicative & only for reference. Set function can be changed depending on the model.

We claim:

1. A device for reducing the temperature of the air, said device comprising of:
i. ice chamber;
ii. back air inlet grill;
iii. left side air inlet grill;
iv. right side air inlet grill;
v. horizontal louver adjust knob;
vi. water inlet;
vii. top panel;
viii. electronic control panel;
ix. front panel;
x. air outlet grill;
xi. water level indicator;
xii. water tank; and
xiii. castor wheels;
Characterized in that the running of the pump is controlled automatically by said variable cooling options depending upon the intensity of cooling required. Thereby optimizing the consumption of water and electricity.

2. The air cooler as claimed in Claim 1, wherein the said air cooler provides the flexibility to change and control the cooling level and humidity of the surrounding atmosphere.

3. The air cooler as claimed in Claim 1, wherein the cooling conditions may set to high, medium or low level.

4. The air cooler as claimed in Claim 1, wherein said air cooler provides the feature of setting “Off Timer” time ranging from 1-7 hours.

5. The air cooler as claimed in Claim 1, wherein a buzzer is installed in said air cooler that sets an alarm whenever the tank gets empty.

6. The air cooler as claimed in Claim 1, wherein the control panel of said air cooler comprises of 10 LED indicators indicating the functions of different features employed in the air cooler.