{"id":1854,"date":"2021-07-05T16:50:51","date_gmt":"2021-07-05T14:50:51","guid":{"rendered":"https:\/\/www.hecoclima.com\/?p=1854"},"modified":"2021-07-05T16:50:51","modified_gmt":"2021-07-05T14:50:51","slug":"the-correct-multipurpose-selection","status":"publish","type":"post","link":"https:\/\/www.hecoclima.com\/en\/the-correct-multipurpose-selection\/","title":{"rendered":"The correct multipurpose selection"},"content":{"rendered":"\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-b7exhx-523995d5ac71f762c9b67ab64ce9ee87\">\n.flex_column.av-b7exhx-523995d5ac71f762c9b67ab64ce9ee87{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-b7exhx-523995d5ac71f762c9b67ab64ce9ee87 av_one_full  avia-builder-el-0  el_before_av_one_full  avia-builder-el-first  first flex_column_div av-zero-column-padding  '     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-kqi1vubx-a03e9a7407f85c34e4a290e5ec0f3907\">\n#top .av-special-heading.av-kqi1vubx-a03e9a7407f85c34e4a290e5ec0f3907{\npadding-bottom:10px;\n}\nbody .av-special-heading.av-kqi1vubx-a03e9a7407f85c34e4a290e5ec0f3907 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-kqi1vubx-a03e9a7407f85c34e4a290e5ec0f3907 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-kqi1vubx-a03e9a7407f85c34e4a290e5ec0f3907 av-special-heading-h1 blockquote modern-quote  avia-builder-el-1  avia-builder-el-no-sibling '><h1 class='av-special-heading-tag '  itemprop=\"headline\"  >The correct multipurpose selection<\/h1><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><\/div>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-9tbaxx-916ab88caae45760f601e708e9d06645\">\n.flex_column.av-9tbaxx-916ab88caae45760f601e708e9d06645{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-9tbaxx-916ab88caae45760f601e708e9d06645 av_one_full  avia-builder-el-2  el_after_av_one_full  el_before_av_one_full  first flex_column_div av-zero-column-padding  column-top-margin'     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-kqi230o5-7bcc14f996d01d46b20a8762a4b6fae9\">\n.avia-image-container.av-kqi230o5-7bcc14f996d01d46b20a8762a4b6fae9 img.avia_image{\nbox-shadow:none;\n}\n.avia-image-container.av-kqi230o5-7bcc14f996d01d46b20a8762a4b6fae9 .av-image-caption-overlay-center{\ncolor:#ffffff;\n}\n<\/style>\n<div  class='avia-image-container av-kqi230o5-7bcc14f996d01d46b20a8762a4b6fae9 av-styling- avia-align-center  avia-builder-el-3  avia-builder-el-no-sibling '   itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\" ><div class=\"avia-image-container-inner\"><div class=\"avia-image-overlay-wrap\"><img data-opt-id=1242044744  data-opt-src=\"https:\/\/mlydlxbisz9j.i.optimole.com\/cb:64pw.3deed\/w:auto\/h:auto\/q:mauto\/f:best\/ig:avif\/https:\/\/www.hecoclima.com\/wp-content\/uploads\/2021\/06\/4T-1.jpg\"  decoding=\"async\"  class='wp-image-1847 avia-img-lazy-loading-not-1847 avia_image ' src=\"https:\/\/mlydlxbisz9j.i.optimole.com\/cb:64pw.3deed\/w:auto\/h:auto\/q:eco\/f:best\/ig:avif\/https:\/\/www.hecoclima.com\/wp-content\/uploads\/2021\/06\/4T-1.jpg\" alt='' title='4T'  height=\"450\" width=\"800\"  itemprop=\"thumbnailUrl\" old-srcset=\"https:\/\/mlydlxbisz9j.i.optimole.com\/cb:64pw.3deed\/w:800\/h:450\/q:mauto\/f:best\/ig:avif\/https:\/\/www.hecoclima.com\/wp-content\/uploads\/2021\/06\/4T-1.jpg 800w, https:\/\/mlydlxbisz9j.i.optimole.com\/cb:64pw.3deed\/w:300\/h:169\/q:mauto\/f:best\/ig:avif\/https:\/\/www.hecoclima.com\/wp-content\/uploads\/2021\/06\/4T-1.jpg 300w, https:\/\/mlydlxbisz9j.i.optimole.com\/cb:64pw.3deed\/w:768\/h:432\/q:mauto\/f:best\/ig:avif\/https:\/\/www.hecoclima.com\/wp-content\/uploads\/2021\/06\/4T-1.jpg 768w, https:\/\/mlydlxbisz9j.i.optimole.com\/cb:64pw.3deed\/w:705\/h:397\/q:mauto\/f:best\/ig:avif\/https:\/\/www.hecoclima.com\/wp-content\/uploads\/2021\/06\/4T-1.jpg 705w, https:\/\/mlydlxbisz9j.i.optimole.com\/cb:64pw.3deed\/w:800\/h:450\/q:mauto\/f:best\/ig:avif\/dpr:2\/https:\/\/www.hecoclima.com\/wp-content\/uploads\/2021\/06\/4T-1.jpg 2x\" \/><\/div><\/div><\/div><\/div><\/p>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-83dslh-fbb58bcc1ed009f8f1e60eaa6bd9bc21\">\n.flex_column.av-83dslh-fbb58bcc1ed009f8f1e60eaa6bd9bc21{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-83dslh-fbb58bcc1ed009f8f1e60eaa6bd9bc21 av_one_full  avia-builder-el-4  el_after_av_one_full  el_before_av_one_full  first flex_column_div av-zero-column-padding  column-top-margin'     ><section  class='av_textblock_section av-kqi2kw68-b346df64f59f52c011b072ac8ebe4537 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p>The manufacturer, based on own experience and knowledge, can suggest some alternative or additional considerations that could help select the most suitable unit for the specific requirements of the project.<\/p>\n<ul>\n<li><strong>Simultaneous loads<\/strong>: the multipurpose unit is born to satisfy a requirement whereby both a cooling and heading load are present. Each manufacturer will approach certain technical design difficulties, such as refrigerant migration during transitioning stages, the forced movement of the refrigerant, oil return and components selection and control, based on their own experience. The moving parts, which are integrated and interdependent during the various stages of operation, are quite many. All the above brings to the conclusion that the application is suitable and will maximize the efficiency and reliability of the product, when the unit is designed considering both cooling and heating loads for the majority of time of the unit\u2019s life.<\/li>\n<li><strong>Independent circuits<\/strong>: unlike heat pumps, where due to the common heat exchanger the advice is to maintain the same dT for both cooling and heating, in a 4-pipe system that is not an issue. The circuits for heating and cooling are independent, therefore the system can be optimized for<br \/>\nsimultaneous loads and different dTs at the same time.<\/li>\n<li><strong>Selecting the unit based on the peak winter requirement<\/strong>: for a 4-pipe system, such a selection choice will have a severely adverse impact on the system. To assess this please note that all the points mentioned in <a href=\"https:\/\/www.hecoclima.com\/en\/the-correct-heat-pump-selection\/\" target=\"_blank\" rel=\"noopener\">the post dedicated to reversible heat pumps<\/a> are still applicable, in addition to some considerations relevant to 4-pipe system units, explained as follows. In the operation of a 4-pipe system (heating + cooling) the gas will condensate via heat exchange with the water, so the fans will not be running. In this operating condition (MULTIPURPOSE) the unit is not affected by the external ambient temperature. This means that the unit will always work at conditions close to nominal. Therefore dimensioning the unit at peak winter condition will effectively increase the capacity and, in the majority of cases, will mean that the unit is reduntant compared to the effective load of the plant.<\/li>\n<li><strong>Heating water flow and cooling water flow<\/strong>: given that oversizing the multipurpose unit will have a purely NEGATIVE effect on the system, we need to evaluate how this affects the energy consumption rates of the whole system. Multipurpose units, as explained above, need to constantly, and according to their own logic, operate a number of heat exchanges based on different states to prevent oil and refrigerant returns. This means that the pumps, both on heating and cooling circuits, have to always be ON and water flow needs to be always guaranteed (this also means that buffer tanks need to be considered accordingly as well). Pumps always ON means a constant power consumption needs to be considered, and if the unit is oversized, such power consumption will impact negatively on the system in a bigger fashion than in the case of reversible heat pumps, increasing overall system power consumption and impacting internal system safety. Such aspects, according to Hecoclima\u2019s experience, are one of the most neglected by consultants, which translates in a chance to aid the selection of the most suitable unit, making the unit more efficient for the system and increasing the energy savings for the end user (power consumption, size of pumps, valves, piping, insulation, buffer tanks).<\/li>\n<li><strong>Consideration of buffer tanks<\/strong>: the note mentioned for reversible heat pumps is still applicable. Moreover, if for heat pumps in certain cases operation without buffer tanks is acceptable, this is NEVER POSSIBLE with multipurpose units. This is why Hecoclima TDS always make available the information necessary to select the suitable buffer tank(s). Why? Because multipurpose units are regulated and calibrated according to timings that sometimes do not coincide with the timings of the plant (for example, a multipurpose unit is in cooling mode, and the plant sends a signal for<br \/>\nheating \u2192 this initiates a series of commands to the unit for various adjustments, which mean that the reaction time will not be immediate, therefore a buffer tank is needed to compensate; the same can be said if the system then stops requiring heating and sends a signal to go back to<br \/>\ncooling mode \u2192 the unit still has to complete the change of state, work in heating mode first, and then switch back to cooling mode). The unit timings not only involve a large number of components and controls, but are also set so that the priority is always to safeguard the unit and its inner<br \/>\nmechanisms: buffer thanks are therefore essential for these systems.<\/li>\n<\/ul>\n<\/div><\/section><\/div>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-28785-93b14bbfbacad2620f1d256b52232d3f\">\n.flex_column.av-28785-93b14bbfbacad2620f1d256b52232d3f{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-28785-93b14bbfbacad2620f1d256b52232d3f av_one_full  avia-builder-el-6  el_after_av_one_full  el_before_av_one_full  first flex_column_div av-zero-column-padding  column-top-margin'     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-kqi2lzs4-6d12f44bde7c677b49407ab28e2b164f\">\n#top .av-special-heading.av-kqi2lzs4-6d12f44bde7c677b49407ab28e2b164f{\npadding-bottom:10px;\n}\nbody .av-special-heading.av-kqi2lzs4-6d12f44bde7c677b49407ab28e2b164f .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-kqi2lzs4-6d12f44bde7c677b49407ab28e2b164f .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-kqi2lzs4-6d12f44bde7c677b49407ab28e2b164f av-special-heading-h3 blockquote modern-quote  avia-builder-el-7  avia-builder-el-no-sibling '><h3 class='av-special-heading-tag '  itemprop=\"headline\"  >A word of advice from Hecoclima<\/h3><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><\/div>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-40wy2d-5ee3ef4b62af6e0b6fe9dd00bdb51534\">\n.flex_column.av-40wy2d-5ee3ef4b62af6e0b6fe9dd00bdb51534{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-40wy2d-5ee3ef4b62af6e0b6fe9dd00bdb51534 av_one_full  avia-builder-el-8  el_after_av_one_full  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decoding=\"async\"  class='wp-image-1849 avia-img-lazy-loading-not-1849 avia_image ' src=\"https:\/\/mlydlxbisz9j.i.optimole.com\/cb:64pw.3deed\/w:auto\/h:auto\/q:eco\/f:best\/ig:avif\/https:\/\/www.hecoclima.com\/wp-content\/uploads\/2021\/06\/poli.jpg\" alt='' title='poli'  height=\"450\" width=\"800\"  itemprop=\"thumbnailUrl\" old-srcset=\"https:\/\/mlydlxbisz9j.i.optimole.com\/cb:64pw.3deed\/w:800\/h:450\/q:mauto\/f:best\/ig:avif\/https:\/\/www.hecoclima.com\/wp-content\/uploads\/2021\/06\/poli.jpg 800w, https:\/\/mlydlxbisz9j.i.optimole.com\/cb:64pw.3deed\/w:300\/h:169\/q:mauto\/f:best\/ig:avif\/https:\/\/www.hecoclima.com\/wp-content\/uploads\/2021\/06\/poli.jpg 300w, https:\/\/mlydlxbisz9j.i.optimole.com\/cb:64pw.3deed\/w:768\/h:432\/q:mauto\/f:best\/ig:avif\/https:\/\/www.hecoclima.com\/wp-content\/uploads\/2021\/06\/poli.jpg 768w, https:\/\/mlydlxbisz9j.i.optimole.com\/cb:64pw.3deed\/w:705\/h:397\/q:mauto\/f:best\/ig:avif\/https:\/\/www.hecoclima.com\/wp-content\/uploads\/2021\/06\/poli.jpg 705w, https:\/\/mlydlxbisz9j.i.optimole.com\/cb:64pw.3deed\/w:800\/h:450\/q:mauto\/f:best\/ig:avif\/dpr:2\/https:\/\/www.hecoclima.com\/wp-content\/uploads\/2021\/06\/poli.jpg 2x\" \/><\/div><\/div><\/div><\/div><\/p>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-114at-8c58282f32d779a4a9b16a3ab53260e8\">\n.flex_column.av-114at-8c58282f32d779a4a9b16a3ab53260e8{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-114at-8c58282f32d779a4a9b16a3ab53260e8 av_one_full  avia-builder-el-10  el_after_av_one_full  avia-builder-el-last  first flex_column_div av-zero-column-padding  column-top-margin'     ><section  class='av_textblock_section av-kqi3hvuc-d0b443afd8039d44ff0a1e8f1be8d5c6 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><ul>\n<li><strong>Selecting the unit based on the peak winter requirement<\/strong>: ALL the considerations made for reversible heat pumps are still valid. Hecoclima\u2019s suggestion is regarding simultaneous loads: particular attention should always be dedicated to how the unit is selected (water flows, buffer tanks) and the first technical data that needs to be evaluated should be the design capacity (COOLING+HEATING).<\/li>\n<li><strong>A suggestion for plant design<\/strong>: quite often manufacturers have to work with design limitations that seem quite improbable, such as unit selection at peak load or operation only in heating mode. Whenever the project engineer has already taken into account all of the manufacturer\u2019s suggestions regarding how to select a multipurpose unit, but chooses to prioritize the critical aspects of the plant and satisfying the end user\u2019s requirements at the most extreme conditions, we have an additional option. We can offer a plant solution whereby the multipurpose unit is designed according to our suggestions paired (meaning that the heating circuit is the same) with a heat pump that will only cover loads at extreme conditions (see suggestions for selection of reversible heat pumps). At this point, by reviewing the notes regarding the water flow requirements for a multipurpose unit, we can see that the solution multipurpose + heat pump allows to keep the heat pump water pump in OFF mode until there is actual heating load, reducing the ancillary costs when the load is close to zero (unit is OFF = pumps are OFF).<\/li>\n<li><strong>Other possible options<\/strong>: the requirement for multipurpose units to produce hot water at very high temperatures is quite low. However, in cases where there is always (or very often) a cooling load, the unit can produce water at low temperature (heating mode) and use the same water to the condenser (via a buffer tank kept at 40\/45 \u00b0C) for a booster with R134a (scroll compressors) which will then allow the water temperature to reach 75..80 \u00b0C.<\/li>\n<\/ul>\n<\/div><\/section><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":1847,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27],"tags":[],"class_list":["post-1854","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-insights"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The correct multipurpose selection - Hecoclima<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.hecoclima.com\/en\/the-correct-multipurpose-selection\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The correct multipurpose selection - 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