Page 19 - PDZA Sustainable Aquarium Brochure

HEATING AND COOLING

Instead of using electricity to reject heat to the Air source heat pump technology uses the
atmosphere and burning natural gas to create same refrigeration cycle to extract heat from the
new heat, we decided to move heat from the chilled water loop. Instead of rejecting it to the
chilled water loop to the hot water loop. This atmosphere, it first injects the heat energy into the
is where heat recovery chillers and heat pump heating water loop when simultaneous heating
technology provide a great opportunity to and cooling occurs (see Figure 4). In short, it
conserve energy. In this project, we used modular moves energy from the chilled water loop to the
air source/sink heat pumps as our key recovery heating water loop. Only when there is a heat
chiller. This enabled energy recovery by moving imbalance does the heat pump unit reach out to
heat around the building before reaching out the ambient air as a heat source or sink.
to the ambient air as a heat source or sink. This
strategy, along with the ability to generate heat
much more efficiently, are a significant contributor
to the energy conservation and low GHG footprint
goals. This type of heat pump combines the
normally separate heating and cooling plants into
one system.

Figure 4—Air Source Heat Pump Modes of Operation Diagram

CASE STUDY: THE PACIFIC SEAS AQUARIUM AT POINT DEFIANCE ZOO & AQUARIUM 19