HVAC systems come in a surprising variety of types and configurations. Single-zone systems are controlled by a single thermostat. Multi-zone systems can serve multiple spaces, each with its own thermostat. Heat can be generated using furnaces, electric resistance, solar panels, or heat-pumps that draw heat from air, water, or the ground. Some systems condition air centrally and distribute it using ducts and fans. Others heat and cool water in large central boilers and chillers, pump the water around the building, and (closer to the occupied zones) transfer the heat to air using coils. Additional options pump hot or cold water through pipes in the floor, ceiling, or specialized panels and radiate heat into (or absorb radiant heat from) the space.
Typically, during early stages of design the focus is on selecting the appropriate system type rather than finalizing the system component details. This allows a holistic view of the situation. Following are couple scenarios which are often encountered by most design teams along with the suggestions on how to model them in cove.tool:
1. Multiple Mechanical Systems Serving Single Building Use-Type.
For example, if the office space is served by a mix of VAV/Electric (65% of the floor-plate), Fan Coil System (20% of the floor plan), and Induction System (15% of the floor-plate), then the system which is serving majority of the floor plan can be selected in cove.tool. Also, the heating and cooling COP values can be adjusted to reflect the impact of other systems.
/2. Multiple Mechanical Systems Serving Different Building Use-Types.
For example, the proposed project has 3 different building types served by 3 different mechanical systems as follows:
- Office: Packaged Unit/Gas Furnace
- Education: CAV/Water Source Heat Pump
- Apartment: DX Split System
The above project can be modeled in cove.tool by utilizing the mixed-use feature which will allow users to select different mechanical system for each building-type. It is important to note that the limit is set at 3 for selecting different use-types in cove.tool for modeling mixed-use buildings. A more detailed zoning is necessary in compliance models.
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