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→Design Considerations
== Design Considerations ==
The HVAC system uses a blend of loosely coupled systems to provide maximum energy efficiency and redundancy for a year-round live-aboard. Fresh-air ventilation uses small zone-based air vents but this makes humidity control difficult. The heating and cooling systems use a shared circulating-water distribution system to minimise bulkhead pass-throughs. Heating is by a diesel furnace with backup from a diesel fireplace. Cooling is by a chiller with keel cooler, with backup from the cold-plate refrigeration system. Hot water is heated by the engine, the diesel oven, a solar collector or AC elements using shore power or the house bank.
[[File:blendedHVAC.png||The heating, ventilation and air-conditioning are a blend of loosely coupled systems to provide maximum energy efficiency and redundancy]]
For completeness in understanding the trade-offs made, the engine cooling system, hot water and refrigeration and watermaker are also shown. Details are described further below.
=== Design Goal ===
The basic heating, ventilation and air conditioning system is described below. In this case the design goal is a year-round live-aboard in north-eastern North America. For completeness in understanding the trade-offs made, the engine cooling system, hot water and refrigeration and watermaker are also shown. Some of the design considerations are:
* One single fuel type on board