Full Description

A lumped capacity model was made of a typical slab-on-grade hydronic radiant floor heating system with zones. Three different control strategies were simulated - (1) pulse-width-modulated zone valves with a constant-temperature boiler, (2) outdoor reset with indoor temperature feedback, and (3) outdoor reset plus pulse-width-modulated zone valves. The strategy of outdoor reset plus pulse-width-modulated zone valves had the most advantages but was also the most expensive to implement.

KEYWORDS: controls, zones, radiant heating, floor heating, boilers, valves, heating, room temperature, water temperature, calculating, hot water supply, comparing.

Citation: Symposium, ASHRAE Trans. 1994, Vol.100, Part 1,