Page 18 - PDZA Sustainable Aquarium Brochure

HEATING AND COOLING

Comparing the annual heating and cooling load The energy transfer calculations take into
profiles for the aquarium, there are significant account heat transfer between the exhibit tanks
periods when there is simultaneous heating and and adjacent spaces. Heat transfer between
cooling. Similarly, the exhibits also have situations the tank surface and the building airspaces
where simultaneous heating and cooling occurs. were determined hourly. They’re based on the
One tank will need cooling while another needs enthalpy exchange between the open water and
heating to maintain the required tank temperature the air factoring in the exposed surface area of
setpoints for each (see Figure 3). As described the water, water temperature, vapor pressure,
above, a traditional central heating plant will air temperature, humidity and vapor pressure at
burn natural gas to provide heat for the building dew point. Conduction through the walls of the
and the LSS’s. At the same time, the central tank into the surrounding airspaces were also
chilled water plant will use electricity to power calculated using the tank wall surface areas and
the refrigeration system to extract heat from the U-values for concrete and acrylic.
building and reject it to the atmosphere.

Figure 3—Annual Building and LSS Simultaneous Heating and Cooling Graph

18 AQUARIUM OF THE SUSTAINABLE FUTURE: PUBLIC FACILITIES DESIGNED TO EMBODY CONSERVATION