Sustainable Building Operation Using Simulation - Low Energy Cooling for Sustainable Buildings - page 222

Figure 6.24 Cooling costs per megawatt hour of cold for different system technology options and
control strategies

by the average COP of the system to refer the cost per megawatt hour of heat to the
cold production and multiplied by the solar fraction s f for the respective contributions
of solar and auxiliary heating. For the cooling water, the costs per megawatt hour
of cooling water were taken from the literature (Gassel, 2004) and referred to the
megawatt hour of cold by multiplication by 1

(1 /COP ) for removing the evaporator
heat (factor 1) and for a factor of (1 /COP ) the generator heat:

+

1

s f C aux
COP

C cooling 1

s f C solar
COP

− 1

COP

C total = C chiller + + + + (6.15)

Figure 6.25 Cooling costs for different operating strategies and cooling distribution systems for the
office with high internal loads