Hi
The building I'm coping with includes some swimming pools.
In the proposed case I've modeled them so that they conform to the project. How should I model them in the baseline case? Should I consider them as "service hot water system"?
In the proposed case the required heat is provided through heat exchanges between the hot wasted water and the cold supplied water, while the remaining required heat is supplied in part through active recovery systems, in part through district heating.
Appendix G points out that combined systems shall use separate systems.
This means i should use in the baseline case a water heater (with efficiency listed in table 7.8 ASHRAE 90.1-2007) in order to heat the water of the pools?
Thank you in advance,
Sonia
You rely on LEEDuser. Can we rely on you?
LEEDuser is supported by our premium members, not by advertisers.
Go premium for
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5924 thumbs up
January 29, 2013 - 9:02 am
Pools are addressed to a degree by Section 7.4.5. These are mandatory provisions.
You could model the pool as basically as a process load, identical in both models. If you wish to claim savings you will need to do an exceptional calculation and make the case for the baseline. They are not service hot water. The water heaters in 7.8 are not pool water heaters so I do not think using them is appropriate.
What is standard industry practice in your area for pool water and space heating? You will need to make the case for an appropriate local baseline to claim savings from since 90.1 does not establish the baseline for this system. COMNET does establish some baseline parameters for pools and perhaps that could be used.
Sonia Martini
4 thumbs up
January 31, 2013 - 5:54 am
Modeling pools as process load (expressed as W or W/sqm) would not guarantee the heat recovery we actually have (both passive and active) and is also not precise as for moisture gains to the zone depending on water temperature/zone relative humidity.
The building is actually being supplied through district heating. Most existing pools have either no heat recovery at all or just passive waste water heat recovery. In Italy there is NO law that requires heat recoveries for pools. I'd say that the baseline could be modeled therefore with no heat recovery. As for the heating equipment for pool water i had a look at COMNET Swimming Pools - Heating Equipment which states as follows:
"If there is gas or oil on the site, the baseline building shall be modeled with a natural gas or oil pool heater meeting the requirements of Table 7.8 for ASHRAE Standard 90.1-2007 and Table 7.2.2 for ASHRAE Standard 90.1-2001. If there is no gas or oil on the site, the baseline building shall be modeled with a heat pump pool heater meeting the requirements of Table 7.8 for ASHRAE Standard 90.1-2007 and Table 7.2.2 for ASHRAE Standard 90.1-2001." The district heating supplying the site uses oil as fuel. So the reference is Table 7.8 and not the heat pump pool heater, right?
Thank you
Sonia
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5924 thumbs up
January 31, 2013 - 9:18 am
Process load in 90.1 is the same thing as an unregulated load. It does not mean that you are modeling something that is a heat source alone.
The law has nothing to do with the baseline. The baseline must be standard industry practice in the project location. You will need to define that, no reference can do so. For example it is standard practice to install heat pumps based systems in my area and gas heat is a rare exception. So my baseline would be a heat pump based system. You can use COMNET to make the case for your baseline but the exceptional calculation will be evaluated relative to your ability to make a rational case for the baseline.