http://www.johndearmond.com/2009/01/21/why-i-hate-heat-pumps/ My little pothole on the information superhighway Sun, 15 Jan 2012 02:53:03 +0000 hourly 1 http://wordpress.org/?v= http://www.johndearmond.com/2009/01/21/why-i-hate-heat-pumps/comment-page-1/#comment-255 Nicholas Fri, 23 Jan 2009 14:55:42 +0000 http://www.johndearmond.com/?p=753#comment-255 Also: what about TRIACs? I suppose the main reason not to use them is slightly reduced efficiency due to the voltage drop they introduce, but they should be pretty robust and able to operate over a fairly wide range of temperatures. They aren't too expensive, either. I can get a 16A 800V TRIAC for a couple of bucks. Add a TRIAC optocoupler and a couple of resistors and you're set. Also: what about TRIACs? I suppose the main reason not to use them is slightly reduced efficiency due to the voltage drop they introduce, but they should be pretty robust and able to operate over a fairly wide range of temperatures. They aren’t too expensive, either. I can get a 16A 800V TRIAC for a couple of bucks. Add a TRIAC optocoupler and a couple of resistors and you’re set.

]]> http://www.johndearmond.com/2009/01/21/why-i-hate-heat-pumps/comment-page-1/#comment-254 Nicholas Fri, 23 Jan 2009 14:53:13 +0000 http://www.johndearmond.com/?p=753#comment-254 Why use thermal relays rather than magnetic relays? Is it a cost issue? Why use thermal relays rather than magnetic relays? Is it a cost issue?

]]> http://www.johndearmond.com/2009/01/21/why-i-hate-heat-pumps/comment-page-1/#comment-252 Tom Thu, 22 Jan 2009 15:58:59 +0000 http://www.johndearmond.com/?p=753#comment-252 Yes, this looks like lack of "real world" testing. I work for a car manufacturer, and we have a rigid sequence of standardized tests. It seems like bureaucratic BS until the tests detect a problem. A lot of production problems occur because someone makes a last-minute "minor" change after the standard tests are done... Yes, this looks like lack of “real world” testing. I work for a car manufacturer, and we have a rigid sequence of standardized tests. It seems like bureaucratic BS until the tests detect a problem. A lot of production problems occur because someone makes a last-minute “minor” change after the standard tests are done…

]]> http://www.johndearmond.com/2009/01/21/why-i-hate-heat-pumps/comment-page-1/#comment-251 Rob Wed, 21 Jan 2009 21:31:39 +0000 http://www.johndearmond.com/?p=753#comment-251 WILD!! I agree. Designed to fail when you most need it. If someone had TESTED it, they probably would have caught this! WILD!! I agree. Designed to fail when you most need it. If someone had TESTED it, they probably would have caught this!

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