stock of chp

[kxxu]

I've got a problem with definig stock of my chp process. I've got ceh between 0.2, my max electrical power is 120 mw and my max thermal power is 156. My stock is 156 or 156+110???

[Antti-L]

If you specify a CEH between 0 and 1, the capacity represents the max. electrical capacity in condensing mode, i.e. just like in a condensing power plant. 

[kxxu]

for chp with backpressure turibine and ceh = 1 I've got max electrical power and max thermal power, for stock is sum or only max thermal power?

[Antti-L]

The thermal power of a power plant is defined as the maximum level of energy extracted from the fuel.  For example, if a 1 GW(e) coal-fired power plant has an efficiency of 40%, the thermal power is 2.5 GW(th). See for example http://c21.phas.ubc.ca/article/clean-coal 

In TIMES, for a CHP with a backpressure turbine, the capacity will never be greater than the thermal power, assuming that you use the parameters ACT_EFF, NCAP_CHPR and VDA_CEH for defining the main technical parameters, and the efficiency is below 1. The capacity will represent either the maximum electrical power in condensing mode, the electrical power in the backpressure mode, or the sum of the electrical and heat power in backpressure mode, depending on the CEH specification (see the documentation).

As I mentioned already, if you specify a CEH between 0 and 1, the capacity will represent the maximum electrical power in condensing mode, and the efficiency then of course also represents the condensing mode efficiency. So, if the thermal power is PTH, the efficiency is F, and CEH=1, the  maximum electrical power in condensing mode will be PTH*F.  This is the max. total level of output you would get from the fuel in condensing mode, and all of it would be electricity.

On the other hand, if you specify a CEH between 1 and Infinity,  the capacity will represent the sum of the electrical and heat power in backpressure mode, and the efficiency will now of course also represent the backpressure mode efficiency. So, if the thermal power is PTH, the efficiency is F, and CEH=1 and CHPR=X, the sum of electrical and heat power in the backpressure mode will be  PTH*F.  This is the max. total level of output you will get from the fuel in backpressure mode, but only the fraction 1/(1+X) of it will be electricity in the backpressure mode.

In other words, in all cases the capacity of the technology will be the thermal capacity *  efficiency.

You should also note that when CEH=1, it is obvious that the maximum electrical capacity in condensing mode is equal to the sum of the electrical and heat power in backpressure mode.

[kxxu]

if I understand correctly for chp with backpressure turbine with max electricity power 110 MW and max thermal power 191 MW, for ceh=0 stock is 110 MW and for ceh=1 stock is 191 MW???

[Antti-L]

In the first case you are right, CHP with backpressure turbine with max electricity power 110 MW and  CEH=0, the capacity of the technology will be 100 MW.

In the second case you are wrong, unless you have specified that efficiency = 1.  Only if the efficiency is exactly 100%, the capacity would be equal to the thermal power.  See my previous post.