Question

What is the condition of refrigerant at the exit of
evaporator in aqua-ammonia absorption system?
a. high pressure ammonia vapour
b. high pressure strong vapour mixture of ammonia
and water
c. low pressure ammonia vapour
d. low pressure strong vapour mixture of ammonia
and water​

Answer 1

Answer:

I think it will be no.

(b)

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Answer 2

Answer:

Option c. Low-pressure ammonia vapor is the correct option. Low-pressure ammonia vapor is the condition of the refrigerant at the exit of the evaporator in the aqua-ammonia absorption system.

Explanation:

In the aqua-ammonia absorption system, ammonia acts as a refrigerant, and water is used as an absorbent. The system comprises a pump, a pressure-reducing valve, and a generator.

• The low-pressure ammonia coming from the evaporator is absorbed by the absorber.
• Aqua-ammonia is formed when the cold-water present in the absorber, absorbs large quantities of ammonia vapor, due to this pressure in the absorber decrease which in turn leads to more absorption of ammonia from the evaporator.
• The heat evolved in the reaction causes the temperature of aqua-ammonia to rise which is then reduced by the cooling system of the absorber because water absorbs less ammonia vapor at high temperatures.

• This solution then goes to a generator by a pump, in which the pressure of the solution is increased up to 10 bar.

• Some external source such as gas or steam heats the solution in the generator.

• Then ammonia vapor is ejected out at high pressure leaving behind the hot weak solution.

• Then via a pressure reducing valve, this weak solution flows back into the absorber and the high-pressure ammonia vapor from the generator is passed to a device called a condenser where it condenses into high-pressure liquid ammonia which is further passed to the expansion valve via a receiver and then to the evaporator.