My idea is to take a block of aluminum and put an independently-controlled thermoelectric Peltier effect heater\/cooler and fan on each side to heat and cool the block.<\/p>\n\n\n\n
A local machine shop cut the block and drilled a hole in the side to accommodate the thermistor probe. The Peltier devices<\/a> are placed on each end in such a way that heat is pumped into one side of the block and pulled out the other. Notice how both the Peltier devices<\/a> are oriented the same way so that heat always moves in one direction thru the simulator.<\/p>\n\n\n\n The cardboard shield needed to be added because the probes were being blown by the fans and didn’t represent the temperature of the block.<\/p>\n<\/div><\/div>\n\n\n\n The bank of TTL-controlled relays provide independent power to the fans By providing both heating and cooling signals any pair of temperature setpoints can be achieved. Running a single Peltier device<\/a> allows chilled-to-room-temperature or room-temperature-to-warm scenarios.<\/p>\n\n\n\n The Arduino Sketch code, the little breadboard, and the relays are working well. The biggest problem has been the thermal grease – it seems to get everywhere…<\/p>\n\n\n\n Thermoelectric Peltier Device Air Conditioning Equipment Simulator<\/a> – is the initial, old post about the same topic.<\/p>\n","protected":false},"excerpt":{"rendered":" To build the Head Pressure Control Optimized Temperature Control Switch (that is being prototyped as an Arduino Sketch and be fully implemented as a re-flashed W1209 device) an HVAC Test Load Simulator needs to be built. Update:The in-process re-flashed device project has been named the HPC09 Head Pressure Control Optimized Temperature Control Switch. Take a … Continue reading “HVAC Test Load Simulator – Update”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":312,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[75,72,49,73,74,71],"class_list":["post-322","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-embedded-software-development","tag-head-pressure-control","tag-software-consulting","tag-st-link","tag-stm8s003","tag-temperature-control-switch"],"_links":{"self":[{"href":"https:\/\/dataexponent.com\/index.php?rest_route=\/wp\/v2\/posts\/322","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dataexponent.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dataexponent.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dataexponent.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dataexponent.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=322"}],"version-history":[{"count":8,"href":"https:\/\/dataexponent.com\/index.php?rest_route=\/wp\/v2\/posts\/322\/revisions"}],"predecessor-version":[{"id":363,"href":"https:\/\/dataexponent.com\/index.php?rest_route=\/wp\/v2\/posts\/322\/revisions\/363"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dataexponent.com\/index.php?rest_route=\/wp\/v2\/media\/312"}],"wp:attachment":[{"href":"https:\/\/dataexponent.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=322"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dataexponent.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=322"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dataexponent.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=322"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\"](\"https:\/\/dataexponent.com\/wp-content\/uploads\/2018\/06\/IMG_1814-1024x576.jpg\")
<\/figure>
Peltier devices<\/a>. In the end, the best HVAC simulation was achieved by running the fans full-time and turning the appropriate Peltier device<\/a> on and off as needed.<\/p>\n\n\n\n![\"\"](\"https:\/\/dataexponent.com\/wp-content\/uploads\/2018\/06\/IMG_1813-1024x576.jpg\")
<\/a><\/figure>\n\n\n\n