Page 51 - 2014 SDCA Project

HVAC/CONTROLS/LIGHTING/FIRE PROTECTION/FIRE ALARM/ Advantages:
Heat pump produces 3kW of heat to 1 kW of electricity spent (an electric heater gives
PLUMBING/SECURITY/ACCESS CONTROL/CCTV/MUSIC/LIFE
you a 1 to 1 ratio)
SAFETY & MISC Easy installation
Easy maintenance

Air Conditioning System Recommendations: Quiet operation
Heating

I. VARIABLE REFRIGERANT VOLUME (VRV)/VARIABLE REFRIGERANT FLOW Cost effective
(VRF) SYSTEM with HEAT RECOVERY – with HEAT RECOVERY VENTILATOR Simple control
VRV or VRF is a commercially applied heating and cooling system that distributes Commercially available in many sizes

refrigerant rather than water, to multiple ducted or un-ducted indoor units
serving the conditioned space.
Disadvantages:
1. Multiple units required (interior and exterior)
Advantages:
1. Energy efficient utilizing variable speed compressors
III. DEDICATED OUTDOOR AIR SYSTEM (for use with VRF system)
2. 10 to 20 percent energy savings compared to conventional systems A dedicated outdoor air system (DOAS) is a type of heating, ventilation and air-
3. Individual control of multiple zones on one piping network conditioning (HVAC) system that consists of two parallel systems: a dedicated outdoor

4. Centralized piping network air ventilation system that handles latent loads and a parallel system to handle sensible
5. Heating and cooling simultaneously loads. The main point of a DOAS system is to provide dedicated ventilation (outdoor air)
6. Tight temperature control, quiet indoor operation
to the building rather than ventilation as part of conditioned air. Published simulation
7. Control using multiple protocols results indicated that the full DOAS resulted in the annual HVAC energy cost savings
8. High EER and COP values ranging from 21% to 38%.

9. Lower maintenance cost
10. Possible tax credit
Advantages:
Simpler design
Disadvantages: Better humidity control and air distribution
1. Installation cost may be higher when compared to a conventional VAV system LEED Certification

Better Filtration characteristics than conventional systems
II. SPLIT SYSTEM HEAT PUMP with Supplemental Heat - with HEAT RECOVERY
Better heat exchanger construction and operation
VENTILATOR
Better temperature control over a wide range of outside air temperature
The split air conditioning means that the condenser or “outdoor unit” is Energy saving more economical operation
separated from the “indoor unit”. Some models come with multiple indoor units LEED Certification

that will use one single compressor; this is known as the multisplit air Easy installation
conditioning system. The heat pump may require additional electric heat to
meet heating demand. For those systems where individual or simultaneous
Disadvantages:
heating and cooling is required, separate split systems should be considered. 1. More ductwork required to get ventilation air to each zone

2. Supply and return ductwork must be routed to DOA unit.

49 SDCA