UC Los Angeles Campus & Medical Center Strategic Energy Plan ...

8.7 Other Projects
8.7.1 Swimming Pools
The Strategic Energy Plan includes energy savings and cost estimates for a number of energy
efficiency measures for swimming pools. Four potential measures have been identified for
campus pools and information is provided for each individual pool when appropriate.
8.7.2 Pool Project 1. Variable Speed Drives and High Efficiency Motors for Filter Pumps
Pool filter pumps are often continuously run at a constant flow rate regardless of usage and
cleanliness standards. Codes typically require certain circulation rates when the pool is
occupied. This measure includes installing a variable speed drive with control system and,
when appropriate, replacing the motor with a premium efficiency motor. The energy savings
calculations for this project assume that the pump will be slowed down to 50% of its normal
speed during unoccupied hours (8 hours per day for most pools).
8.7.3 Pool Project 2. Pool Covers
Heated pools and spas lose approximately 70% of their energy to evaporation. Since
evaporation is the major source of heat loss for pools, covering the pool when it is not in use is
an effective manner of minimizing water and heat loss. This project includes standard insulating
pool blankets, storage reels, and a power winder. Energy savings are modeled using the
RETScreen4 software. The calculations assume that pool covers will be used eight hours per
day.
8.7.4 Pool Project 3. Solar Water Heating
Solar water heating can significantly reduce pool operating cost by decreasing heating
requirements. This measure is for a solar pool heating system of unglazed collectors with a total
collecting area equal to 60% of the size of the area of the pool. Energy savings are modeled
using RETScreen4 software. The calculations assume that pool covers are installed and used to
minimize heat loss.
8.7.5 Pool Project 4. Boiler Replacement
This project replaces standard boilers for pool heating with dedicated high efficiency condensing
boilers. The energy savings calculations for this measure assume 80% thermal efficiency for the
currently installed boiler. Although some condensing boilers for pool heating claim up to 98%
thermal efficiency, a conservative estimate of 90% thermal efficiency was used for the
replacement boiler. The baseline energy consumption for this measure assumes that both pool
covers and solar water heating are used. Information is not provided for pools that are heated
using the central loop or a non-dedicated boiler.
8.7.6 Domestic Solar Hot Water
The use of solar hot water heating was explored as a possible measure to reduce energy use in
campus residences. Total domestic hot water consumption was estimated for large residence
halls and apartment buildings based on occupancy data collected from the campuses. Then,
using data on the solar resource available on each campus and an assumed fraction of total
2413.01/Reports/UC SEP Final Report – UCLA.doc 8-17 December 31, 2008
Newcomb | Anderson | McCormick