No products
M00003676
New product
AN-92-02-3 -- Measured Savings from Time of Demand-Based Temperature Controls on Service Water Heaters in Apartment Buildings
Conference Proceeding by ASHRAE, 1992
Lobenstein, M.S., Bohac, D.L., Staller, T.J., et al
In stock
States that multifamily buildings larger than 40 units commonly have a pump on the domestic hot water system that constantly circulates heated water through a piping loop. Such a system ensures continuous delivery of hot water, but high piping losses decrease overall efficiency. Describes how, to investigate the strategy of reducing system temperatures during periods of low demand, time-based and demand-based temperature controls were installed in three apartment buildings. The purpose was to assess savings potential, operation and tenant acceptability. Tests were conducted using an alternating mode design monitored by a computerised data acquisition system. States that this control strategy is worthwhile even in a relatively small building, this control strategy is worthwhile. Energy savings averaged 10.3% of domestic hot water heating for the time control and 16.2% for the demand control, with simply paybacks of 2.2 and 1.9 years respectively. The demand control was easier to operate and appears less likely to be overridden.
KEYWORDS: Flats, USA, controls, domestic, hot water supply, controls, temperature, experiment, energy conservation, testing
Citation: ASHRAE Trans. 1992, vol.98, part 1, paper number AN-92-2-3, 676-689, 4 figs, 7 tabs, refs.