Sie müssen Brand Viagra nur bei derviagra apothekeViagra Brand ist für jene Patienten nicht angezeigt, die eine andere Medizin gegen

Cialis is cheaper than brand pills, and you can always afford normal treatmentcialis onlineCialis online simply place your order, use your credit card to pay for your pillscialistaking erection pills to support your compromised erectile function (you will not have to take Cialis for the rest of your life.There is only one place to play from Online Casinos.casinoPlay Online Slots.Usually the recommended dose is 50 mg Viagra.ViagraViagra 100mg

Final Results from Energy Modeling by Zero Energy Design

by Chad Ludeman on May 9, 2008 · 9 comments

in energy modeling,Green Programs

Yesterday I received the final report from Zero Energy Design with the results of their energy modeling. We put out a joint press release this morning but I thought I would include a bit more detail along with some of the pretty charts that ZED made here on the blog.


ZED provided charts and analysis on three different models for the home. The first is the “Baseline” which is how a home built to code of the same size would perform. The next series is called “ZED Improved” and represents the features we plan to put in the base 100K House that will fit in our budget. The final model is called “ZED Optimized” and includes two optional upgrades that the home buyer could choose to have us install at an extra cost prior to them taking ownership of the home.

Before getting into more detail, here are two summary charts that show the results of the modeling.

ZED Improved Comp Chart

ZED Improved Comp Chart 2

The ZED Improved version that we will be going with on the base home will use 43% less energy than the Baseline code home. Zero Energy Design also remarked that the average existing home performs over 30% worse than a new code home built today. This means that the base 100K House should be 2.5 times more energy efficient that the average existing home.

The ZED Optimized version uses 8% less energy than the ZED Improved and 48% less than the Baseline model.

Three Model Comparison

Baseline Code Built Model

There’s not a lot to say about the Baseline model. Code homes have insulation values of R-13 in the walls and R-38 in the ceiling. They use standard windows, HVAC equipment and appliances that are not energy star rated. Below is the breakdown of monthly energy consumption by use. Heating is in red, lighting in yellow, hot water in orange and appliances in green.

Baseline Energy Consumption Bar

ZED Improved Model (Base 100K House)

Some of the features that the ZED Improved model include are as follows:

  • SIP walls at R-24, SIP ceilings at R-42 and a tighter envelope than code
  • Energy Star windows by Pella Proline with a U-value of 0.34 and Solar Heat Gain Coefficient of 0.28
  • Programmable Thermostat
  • A 90% efficient gas water heater
  • An Energy Recovery Ventilator (ERV)
  • A solar thermal system with an 80-gallon tank and one solar panel
  • Compact Fluorescent Lighting
  • Energy Star Appliances

I have included a few more charts to show the performance breakdown for this model in a bit more detail below:

ZED Improved Bar

ZED Improved Pie

One thing to note is that as the home gets more energy efficient overall, the appliances really take up a large portion of the overall energy consumption. This is even without our TV’s, stereos and PC’s in the mix so you can start to see how much energy we still consume outside of heating and cooling. No matter how efficient a home is, it will still take a sizable renewable energy source like solar or wind to bring a home down to zero energy/carbon levels.

ZED Optimized Model

The ZED Optimized model adds two upgrade options to the home:

  1. An additional solar thermal panel to double the impact on the hot water energy consumption
  2. Cellular thermal window shades on all windows to double their R-value

We put these into the optimized model because they just could not be fit into the budget of the base 100K House. There is an outside chance that we can fit the second solar thermal panel into the budget due to federal incentives, but we will leave the window shades out. The buyer can decide if they would like to implement and also be able to choose the style and level of insulation they would like to have installed. See the final chart below for details on the Optimized model.

ZED Optimized Bar

That’s it for now. I am off to a budget review meeting. We’ll try to provide more details on the equipment we decide to put in the final house over the next week as we nail this down with our HVAC installer and the rest of the team.

If you enjoyed reading this post I can promise you'll love our new writing over at Postgreen Homes. Yeah, we know that's the same thing your favorite band said and their new album is nowhere near as good as their early stuff, but seriously, we are actually still getting better.

There also isn't much conversation to be had here . . . at least not with us. So come on over to the Postgreen Homes Blog and tell us what you think of our new(ish) digs and crazy ideas. We will be sure to tell you what we think of your opinion.

{ 1 trackback }

New Mechanicals for 100K |
May 22, 2008 at 5:50 pm

{ 8 comments… read them below or add one }

1 Ray May 10, 2008 at 6:08 pm

Do these results assume a certain household size?

I take it they are predicated on the average weather for Philly?

2 chad May 10, 2008 at 7:12 pm


These results all assume a house of the same size built to different standards. You are correct in that the results are also predicated on the average weather for Philly.

- Chad

3 Ray May 11, 2008 at 10:59 pm

Thanks for the reply. To clarify my first question, is the assumption two adults in each house modeled? Two adults and a kid? One person?


4 Adam May 14, 2008 at 3:37 pm

It was modeled for 2 adult occupants, 16 hours per day occupancy, and numerous other inputs…

5 Robert May 15, 2008 at 1:24 am

Are these HERS indexes? The optimized house would have an index of 57?

6 chad May 15, 2008 at 3:05 am

These are not HERS indexes. The HERS scores will be lower. I would explain why if I knew…

7 Gary December 24, 2008 at 3:24 am

Would you mind sharing with us the approximate cost and turnaround time for the ZED energy modeling?

8 chad December 24, 2008 at 2:51 pm

Gary – It probably only took 2-3 weeks from start to finish. You’d have to call ZED for pricing as they gave us a pretty good deal and I wouldn’t want to misrepresent their rates…

Leave a Comment

Previous post:

Next post: