Solar refrigeration system with calulations

1. SOLAR REFRIGERATION SYSTEM
+

2. BASIC CONCEPT
Utilisation
In
of solar energy for cooling purpose
this system ,solar energy is coupled with
vapour absorption refrigeration system

3. VAPOUR ABSORPTION REFRIGERATION SYSTEM
The
main parts of basic VARS are:
Absorber
Pump
Generator
Condenser
Throttling valve
Evaporator

4. VARS PAIRS
Ammonia Water
 Water LiBr
 R22 - dimethyl ether tetraethylene glycol
(DMETEG)
 R21 - DMETEG
 R22 - dimethyl formamide (DMF)
 R12 - dimethyl acetamide
 R22 - dimethyl acetamide
 R21 - dimethyl ester


5. LAYOUT

8. WORKING
•
•
•
Ammonia vapour produced in the generator at
high pressure from strong solution of NH3 by an
external heating source.
The water vapour carried with ammonia is
removed in the rectifier and only dehydrated
ammonia gets enters into the condenser
The cooled NH3 solution is passed through
throttle valve and the pressure and temperature
of refrigerant are reduced below the
temperature to be maintain in the evaporator.

9. The low temperature refrigerant enters the
evaporator and absorbs the required heat
from evaporator and leaves the evaporator
as saturated vapour
 Slightly superheated low pressure NH3
vapour is absorbed by weak solution of NH3
which is sprayed in the absorber


10. Weak NH3 solution(aqua-ammonia) entering
the absorber becomes strong solution after
absorbing NH3 vapour and then it is pumped
to the generator through heat exchanger
 The pump increases the pressure of strong
solution to generated pressure.
 The strong NH3 solution coming from the
absorber absorbs heat from high temperature
weak NH3 solution in heat exchanger


11. The solution in the generator becomes weak
as NH3 vapour comes out of it
 The weak high temperature ammonia
solution from the generator is passed to the
heat exchanger from throttle valve
 The pressure of the liquid is reduced to
absorber pressure by the throttle valve


12. COMBINING VARS WITH SOLAR ENERGY
The main power consumption of VARS is
generator.
 So,the power is supplied by solar energy
 Hence the amount of energy required to run
the generator is calculated for the desired
conditions.


18. CALCULATIONS
Calculations are performed for the ammonia
water VARS based on
Condenser Pressure
Evaporator Pressure
Generator Temperature
Absorber Temperature


19. Calculations related to
heat

22. Calculations related
to radiation

23. EQIVALENT DAYS FOR MONTHS
MONTHS
EQUIVALENT
DAYS
JANUARY
17
FEBRUARY
16
MARCH
16
APRIL
15
MAY
15
JUNE
11
JULY
17
AUGUST
16
SEPTEMBER
15
OCTOBER
15
NOVEMBER
14
DECEMBER
10

24. AVERAGE SUNSHINE HOURS FOR MONTHS
MONTHS
AVG. SUNSHINE
HOURS
JANUARY
8.6
FEBRUARY
9.5
MARCH
9.8
APRIL
9.2
MAY
8.4
JUNE
6.5
JULY
4.8
AUGUST
5.3
SEPTEMBER
6.2
OCTOBER
6.5
NOVEMBER
6.9
DECEMBER
7.6

29. TIMELINE

30. REFERENCES
Refrigeration and air conditioning
C.P.Arora
Solar Energy-Principles of Thermal
Collection and Storage
- S.P.
Sukhatme
www.ashrae.org
www.wikipedia.org