{"id":9213,"date":"2015-06-30T08:07:15","date_gmt":"2015-06-30T07:07:15","guid":{"rendered":"https:\/\/mag.ebmpapst.com\/en\/?p=9213"},"modified":"2024-03-12T17:56:32","modified_gmt":"2024-03-12T16:56:32","slug":"operation-geared-to-requirements","status":"publish","type":"post","link":"https:\/\/mag.ebmpapst.com\/en\/products\/fans\/operation-geared-to-requirements_9213\/","title":{"rendered":"Oper\u00ada\u00adtion geared to require\u00adments"},"content":{"rendered":"
<\/a>

Fig. 1: Power consump\u00adtion of an AHU over the course of a week<\/p><\/div><\/div>\n

An office complex with a glass facade, a summer\u2019s day with temper\u00ada\u00adtures of 35 \u00b0C in the shade, full of people, maximum demand for venti\u00adlation and cooling and no main\u00adte\u00adnance or servicing due for a long time yet \u2013 that would be one way of describing the maximum require\u00adments for an air handling system.<\/p>\n

In commer\u00adcial, munic\u00adipal and indus\u00adtrial appli\u00adca\u00adtions, maximum load situ\u00ada\u00adtions only ever occur on a few days in the course of a working year (Fig. 1).<\/p>\n

But the neces\u00adsary cooling and heating perfor\u00admance and minimum air exchange rates still have to be reli\u00adably provided even then. The maximum load situ\u00ada\u00adtion is thus the crucial factor for dimen\u00adsioning of the air handling system and fans \u2013 but it is not the most impor\u00adtant when viewed over the entire oper\u00adating period! <\/p>\n

Oper\u00adating point and effi\u00adciency<\/h2>\n

An infor\u00adma\u00adtion brochure* issued by the German energy agency dena contains the following recom\u00admen\u00adda\u00adtion: \u201cIn the short term, the time of day, produc\u00adtion fluc\u00adtu\u00ada\u00adtions and weather condi\u00adtions may cause the oper\u00adating point to change.  <\/p>\n

<\/a>

Fig. 3a, b, c: As compared to an AC stan\u00addard motor with converter and the same power rating, the Green\u00adTech EC motor is roughly 28 % more effi\u00adcient for the load profile under consid\u00ader\u00ada\u00adtion<\/p><\/div><\/div>\n

<\/a><\/p>\n

<\/a>Over the medium term, changes may come about due to seasonal influ\u00adences or the degree of manu\u00adfac\u00adturing capacity util\u00adi\u00adsa\u00adtion and in the long term as a result of increasing filter resis\u00adtance etc.<\/p>\n

Under such circum\u00adstances it would be wrong to set the design oper\u00adating point (least favourable condi\u00adtions and maximum perfor\u00admance require\u00adment) at the point with the best effi\u00adciency level.<\/p>\n

It is better to have the oper\u00adating point for the most frequent oper\u00adating situ\u00ada\u00adtion set here. The ideal solu\u00adtion is to perform opti\u00admi\u00adsa\u00adtion on the basis of the expected load and select the char\u00adac\u00adter\u00adistic curve with the lowest annual energy costs.\u201d<\/p>\n

So the key is to have a tech\u00adnology which provides more or less infi\u00adnitely vari\u00adable adap\u00adta\u00adtion of the air flow to the actual require\u00adment. This ability is already inte\u00adgrated into the RadiPac for oper\u00ada\u00adtion in air handling units. Its capacity for adjust\u00adment over a broad speed range ensures excel\u00adlent effi\u00adciency and helps to cut oper\u00adating costs. This is illus\u00adtrated by comparing an AC fan with frequency converter to a Green\u00adTech EC fan (Fig. 2).<\/p>\n

For the load profile shown (Fig. 3a, b, c), the effi\u00adciency of the EC fan is around 28 % higher. In addi\u00adtion to reduced power consump\u00adtion, other bene\u00adfits include far lower assembly and instal\u00adla\u00adtion costs, less weight and a space-saving design.<\/p>\n

Correct values in partial load oper\u00ada\u00adtion<\/h2>\n

Partial load is thus of consid\u00ader\u00adable impor\u00adtance when plan\u00adning and oper\u00adating air handling systems with a view to keeping running costs to a minimum. RadiPac EC centrifugal fans provide an ideal solu\u00adtion.<\/p>\n

\"Systemvergleich\"<\/a>

Fig. 2: System compar\u00adison between an IEC-E2 motor with frequency converter, sine filter and protec\u00adtive circuitry and a Green\u00adTech EC motor from ebm-papst<\/p><\/div><\/div>\n

The certi\u00adfied Product Selector makes it possible to real\u00adis\u00adti\u00adcally simu\u00adlate these oper\u00adating condi\u00adtions because its data\u00adbase contains the measured perfor\u00admance data of the fan. Absolute plan\u00adning reli\u00ada\u00adbility is thus guar\u00adan\u00adteed.  <\/p>\n

Authentic oper\u00adating condi\u00adtions<\/h2>\n

Cate\u00adgory A measure\u00adments with free inlet and free outlet are defin\u00adi\u00adtive for the data given in the product cata\u00adlogues and Product Selector and permit direct fan compar\u00adisons (Fig. 4a). The fans in an air handling unit operate in more or less confined spaces. This leads to a reduc\u00adtion in air perfor\u00admance which has to be taken into consid\u00ader\u00ada\u00adtion when selecting the right fan (Fig. 4b). <\/p>\n

\"Einbauverhaeltnis_a\"<\/a>

Fig. 4a<\/p><\/div><\/div>

\"Einbauverhaeltnis_b\"<\/a>

Fig. 4b<\/p><\/div><\/div>\n

 <\/p>\n

ebm-papst\u2019s docu\u00admented values are based on customer require\u00adments and the possible oper\u00adating condi\u00adtions involved. When choosing fans, the Product Selector makes it possible to incor\u00adpo\u00adrate various factors of influ\u00adence, including the loca\u00adtion of the air handling system or the avail\u00adable fan instal\u00adla\u00adtion space.<\/p>\n

\"K3G500AP2401_mit<\/a>

Fig. 4c: In the Product Selector the \u201cinstal\u00adla\u00adtion situ\u00ada\u00adtion\u201d can be repre\u00adsented by selecting the size of the air handling units<\/p><\/div><\/div>\n

This permits a reli\u00adable assess\u00adment of energy effi\u00adciency, as well as oper\u00adating and life cycle costs, because here again a whole range of correct values provide the foun\u00adda\u00adtion. The real\u00adistic consump\u00adtion and perfor\u00admance figures supplied by ebm-papst help to ensure that the fore\u00adcast perfor\u00admance values are actu\u00adally achieved in prac\u00adtice (Fig. 4c). Selec\u00adtion of the correct fan is thus guar\u00adan\u00adteed.  <\/p>\n

*dena guide \u201cVenti\u00adlation Tech\u00adnology for Industry and Commerce\u201d<\/p>\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

An office complex with a glass facade, a summer\u2019s day with temper\u00ada\u00adtures of 35 \u00b0C in the shade, full of people, maximum demand for venti\u00adlation and cooling and no main\u00adte\u00adnance or servicing due for a long time yet \u2013 that would be one way of describing the maximum require\u00adments for an air handling system. In [\u2026]<\/p>\n","protected":false},"author":16,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"wp_typography_post_enhancements_disabled":false,"footnotes":""},"categories":[16],"tags":[111],"class_list":["post-9213","post","type-post","status-publish","format-standard","hentry","category-fans","tag-tbe"],"acf":[],"_links":{"self":[{"href":"https:\/\/mag.ebmpapst.com\/en\/wp-json\/wp\/v2\/posts\/9213","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mag.ebmpapst.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mag.ebmpapst.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mag.ebmpapst.com\/en\/wp-json\/wp\/v2\/users\/16"}],"replies":[{"embeddable":true,"href":"https:\/\/mag.ebmpapst.com\/en\/wp-json\/wp\/v2\/comments?post=9213"}],"version-history":[{"count":1,"href":"https:\/\/mag.ebmpapst.com\/en\/wp-json\/wp\/v2\/posts\/9213\/revisions"}],"predecessor-version":[{"id":18746,"href":"https:\/\/mag.ebmpapst.com\/en\/wp-json\/wp\/v2\/posts\/9213\/revisions\/18746"}],"wp:attachment":[{"href":"https:\/\/mag.ebmpapst.com\/en\/wp-json\/wp\/v2\/media?parent=9213"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mag.ebmpapst.com\/en\/wp-json\/wp\/v2\/categories?post=9213"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mag.ebmpapst.com\/en\/wp-json\/wp\/v2\/tags?post=9213"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}