Air conditioning works by altering the temperature and humidity of air to more comfortable levels. There are two main types: window units which fit in windows, and split systems which separate the hot and cold components. Window units contain a compressor, expansion valve, hot and cold coils, fans, and controls. Split systems separate the cold indoor coil from the hot outdoor condensing unit. When powered, the compressor increases the pressure and temperature of the working fluid which then cools as it passes through the condenser. Solar air conditioning uses solar power through hybrid systems that combine photovoltaics and batteries, or absorption chillers that cool air through evaporation and solar-powered fans. While more environmentally friendly than conventional AC

1. Air Conditioning
 Air conditioning is the process of altering the
properties of air (primarily temperature and
humidity) to more favourable conditions.
 More generally, air conditioning can refer to any
form of technological cooling, heating, ventilation,
or disinfection that modifies the condition of air.
 An air conditioner :AC or A/C, is a major or home
appliance, system, or mechanism designed to
change the air temperature and humidity within an
area (used for cooling and sometimes heating
depending on the air properties at a given time).

2. Window and Split-systemAC Units
 A window air conditioner unit implements a
complete air conditioner in a small space. The
units are made small enough to fit into a standard
window frame. You close the window down on the
unit, plug it in and turn it on to get cool air. If you
take the cover off of an unplugged window unit,
you'll find that it contains:
 A compressor
 An expansion valve
 A hot coil (on the outside)
 A chilled coil (on the inside)
 Two fans
 A control unit

3. HOW IT WORKS ?
 When you get into larger air-
conditioning applications, its time to
start looking at split-system units. A
split-system air conditioner splits the
hot side from the cold side of the
system, as in the diagram.
 The cold side, consisting of the
expansion valve and the cold coil, is
generally placed into a furnace or
some other air handler. The air
handler blows air through the coil and
routes the air throughout the building
using a series of ducts. The hot side,
known as the condensing unit, lives
outside the building.
 The unit consists of a long, spiral coil
shaped like a cylinder. Inside the coil
is a fan, to blow air through the coil,
along with a weather-resistant
compressor and some control logic.

4. Compressor work
 The working fluid arrives at the compressor as
a cool, low-pressure gas.
 The compressor squeezes the fluid. This
packs the molecule of the fluid closer together.
The closer the molecules are together, the
higher its energy and its temperature.
 The working fluid leaves the compressor as a
hot, high pressure gas and flows into the
condenser.

5. SOLAR AIR CONDITIONING
SYSTEMS
 Solar air conditioning refers to any air
conditioning (cooling) system that uses solar
power.
 Solar air conditioning units come in two basic
types:
 hybrids and
 chillers

6. A hybrid system
 A hybrid system combines
photovoltaic technology
(PV) with direct current
(DC).
 It automatically switches
between solar and battery
power as needed.
 When it's set to hybrid
mode, these systems
charge their batteries when
the sun is shining; when it
isn't, the system runs on
battery backup while
charging its batteries via
alternating current (AC)

7. Solar-powered absorption
chillers
 Solar-powered absorption chillers,
also known as evaporative coolers,
work by heating and cooling water
through evaporation and
condensation.
 Chillers cool the air by blowing it
over water-saturated material --
solar energy is used to power the
fan and motor.
 SolCool's hybrid solar air
conditioner, for example, runs on
solar energy, can be plugged in or

10. Compressor work
 The working fluid arrives at the compressor as
a cool, low-pressure gas.
 The compressor squeezes the fluid. This
packs the molecule of the fluid closer together.
The closer the molecules are together, the
higher its energy and its temperature.
 The working fluid leaves the compressor as a
hot, high pressure gas and flows into the
condenser.

11. Environmental Benefits of Solar Air
Conditioners
 Conventional air conditioners running at the
hottest points of the day contribute to power grid
demands that often lead to outages.
 Solar air conditioning units offer environmental
benefits including
 lower grid demand
 load shifting during peak usage,
 reduced electricity costs,
 fewer power outages,
 off-the-grid capabilities and
 reduced greenhouse gas emissions.

12. Concerns about Solar Air
Conditioners
 For those looking to replace their conventional air conditioning with
a greener option, solar-powered absorption chillers do offer
reduced energy consumption but will increase a home's water
consumption.
 By design, chillers need to be hooked up to a water line or water
storage tank, making them a little less green than the hybrid solar-
powered air conditioners that run on solar energy and battery
power.
 And no matter which style you prefer, a solar-powered air
conditioner unit is going to cost you.
 It's not as much as installing solar panels on your roof, but
compared to medium-sized conventional window air conditioning
units that typically sell in the hundreds of dollars--
 a solar-powered system will cost you a few thousand plus
installation fees. Chillers will also need to be hooked up to a water
line. However, the cost savings to the planet and to your wallet in
the long run could be encouragement enough.

13. COMPARISON

14. EXAMPLES