Open loop rankine cycle with no condenser

[sam_89]

Hello,

I'm working on a small scale parabolic trough concentrator project to generate electricity.
This electricity is used for pumping water for irrigation,and I want to use an open loop Rankine cycle with no condenser(if it is applicable),to reduce cost,with the steam exhausting directly into the atmosphere.
So is it applicable? and how much the efficiency is decreased in this case?
Please provide me with detailed explanation if possible

This is a small scale project,the surface of the terrain is small,the system will function a few hours,so the amount of water lost is not huge.the idea is to check if removing the condenser and saving its cost, is beneficial in this application or not,although the efficiency of the rankine cycle will decrease .The question is how much will it decrease and is it worth removing the condenser ,in this case.
This system need to be as simple as possible,It will be used in rural areas.

 

[Valerie Park]

An open loop Rankine cycle is possible, but it is not as efficient as a closed loop system with a condenser. The efficiency of an open loop Rankine cycle is typically around 8-10%, while a closed loop Rankine cycle is around 20-30%. The difference in efficiency is due to the heat that is lost when the steam exits the system and goes into the atmosphere. The additional heat lost through the exhaust of the steam is why the efficiency is lower for an open loop system. The decision to use an open loop Rankine cycle versus a closed loop system with a condenser will depend on the cost benefit analysis for your specific application. If the cost of the condenser is too high, then the open loop system may be a more cost effective option. However, this will depend on what energy output you need from the system and how much energy you are able to generate with the 8-10% efficiency of the open loop system. I hope this helps!