Apparatus and method for controlling temperature and humidity of a conditioned space

A method of conditioning the air within a conditioned space comprising:

• a) providing an outside air cooling coil circuit and a return air cooling coil circuit;
• b) monitoring the conditioned space for the presence or absence of a human;
• c) when a human is present, continuously directing outside air onto the outside air cooling coil circuit and into the conditioned space;
• d) continuously monitoring the need to decrease the humidity of the outside air directed onto the outside air cooling coil circuit to maintain the humidity within the conditioned space below a select humidity threshold;
• and
• e) circulating coolant through the outside air cooling coil circuit when 1) a human present in the conditioned space and 2) the humidity within the conditioned space is determined to be above the select humidity threshold.

A heating, ventilation and air conditioning (HVAC) unit for a conditioned space comprising:

• an outside air cooling coil circuit in fluid communication with coolant from a coolant supply, the outside air cooling coil circuit having a leading and a trailing surface;
• an outside air intake introducing air from outside to inside the conditioned space, the outside air intake being positioned to distribute outside air to the leading surface of the outside air cooling coil circuit;
• a damper in fluid communication with the outside air intake having an open position permitting and a closed position preventing outside air to enter the outside air intake;
• a valve in fluid communication with the coolant supply and outside air cooling coil circuit, the valve having an open setting permitting and a closed setting preventing the circulation of coolant through the outside air cooling coil circuit;
• an exhaust introducing the outside air from the trailing surface of the outside air cooling coil circuit to the conditioned space;
• an HVAC unit control operatively associated with the valve and the damper for controlling their operation;
• and
• an occupancy control means for generating a signal indicating the presence of a human within the conditioned space operatively associated with the HVAC until control, the HVAC unit control, in response to a signal from the occupancy control indicating the presence of a human within the conditioned space, causing the damper to be in the open position and enabling the valve to be switched between the closed and open settings.