Energy conservative control of terminal reheat heating, ventilating, and

Abstract

A terminal reheat HVAC system which regulates the temperature in a plurality of temperature controlled spaces by modulating the temperature of cool discharge air presented to each of the spaces from an air handler source, each space receiving the cool discharge air through an associated space distribution unit which includes heating apparatus supplied from a common heat source for reheating the cool air to provide temperature regulation within the space in response to a space temperature error signal from an associated space temperature control, is controlled by electronic processing means in combination with dedicated sensing and control apparatus which provide actuation of the air handler and common heat source only in response to actual sensed space temperatures outside of a temperature band established by heat and cool temperature reference signals stored in the electronic processing means, the electronic processing means further providing modulation of the cool discharge air temperature from the air handler, following actuation in response to an actual sensed space temperature higher than the cool temperature reference, in dependence on the temperature difference between the actual space temperature and the cool reference.