HVAC SYSTEMS - HFT Stuttgart

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CHAPTER 02
simulation based analyses on control strategies of solar cooling systems, new
and more detailed models of the components of solar cooling systems needed
to be developed. Within this chapter the developed models like dynamic solar
collector, heat storage with stratification, solar heat exchanger, absorption
chiller static and dynamic, dry and wet heat rejection systems, sorption wheel
and dynamic humidifier are described in detail.
2.2 CLOSED SOLAR DRIVEN ABSORPTION COOLING SYSTEMS
Closed solar driven absorption cooling systems consist apart from the
absorption chiller typically of a liquid based solar system which provides the
required driving heat for the system. The solar system consists of solar
collectors, a solar heat exchanger and a hot water storage tank. For heat
rejection either wet cooling towers or dry heat rejection systems are used. On
the cold distribution side most systems operate with smaller or larger cold water
storage. In case of insufficient solar heat supply an auxiliary heating device is
connected to most of the systems. Fig. 2-1 shows a scheme of a solar driven
absorption cooling system.
Auxiliary
heater
Solar collectors
Hot water
storage tank
Absorption
chiller
Heat
rejection
system
Fig. 2-1: Scheme of a solar driven absorption cooling system
M
M
Cold water
storage tank
Cold distribution
M