Skip to main content
Tag

cooling system

Energy Efficiency in a Land of Renewable Foie Gras

By Energy Rant No Comments
A couple weeks ago in Renewable Energy, Bad Parents, and Strawberries, I wrote that the value of an electrical generating resource depends a little on how cheaply it can produce energy (kWh), but a LOT on when and the (new word alert) dispatchability of the resource. For instance, California already has so much solar generation at the wrong time of day that it needs to dump kWh by paying producers to quit. This is demand response in reverse, or (new term alert) supply response. Yes, they are curtailing less than 1% of sales, but they are also two years ahead…
Read More

Cooling System Temperature Control- No Savings

By Energy Efficiency, Energy Rant 5 Comments
Let’s skip the energy supply side this week and talk about thermostats used for cooling. Let’s broaden the discussion to include both programmable thermostats and “smart” or “learning” thermostats. The Nest falls into the latter group. Speaking for the Nest, which I have controlling my heating and cooling, it will learn user patterns by when, and to what level, the user changes temperature setpoints. It also secretly learns the users’ occupancy patterns by keeping an infrared eye on them. For instance, if the thermostat is in a heavy traffic area, it will learn to expect a lot of traffic, and…
Read More

Energy Management System – Not Another Litter Box

By Energy Efficiency, Energy Rant No Comments
In recent weeks, I have been spending considerable time examining energy management system projects for energy efficiency program evaluation on the east coast.  My conclusion is this: blown opportunity abounds. The program documentation for one particular project drips with evidence that the project is a free rider, which means the project would have happened anyway in absence of the program.  How do I reach this conclusion?  First, the calculation methodology could work if the user knew what they were doing, but it is clear they either don’t know what they are doing or don’t care to get it right –…
Read More