1. SOLAR REFRIGERATION SYSTEM+

2. Basic concept vapour absorption refrigeration system
Utilisation of solar energy for cooling purpose
In 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. R22 - dimethyl ether tetraethylene glycol (DMETEG) R21 - DMETEG
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
EQUIVALENT DAYS
JANUARY 17
FEBRUARY 16
MARCH
APRIL 15
MAY
JUNE 11
JULY
AUGUST
SEPTEMBER
OCTOBER
NOVEMBER 14
DECEMBER 10

24. AVERAGE SUNSHINE HOURS FOR 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
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  