Industrial Air Diffuser Type DLD for Heating and Cooling

Transcription

1 LTG Incorporated Industrial Air Diffuser Type DLD for Heating and Cooling LTG Incorporated Corporate Drive, Suite E Spartanburg, SC 20 PO Box 288, Spartanburg, SC 20 USA Tel: 8--0 Fax: info@ltg-inc.net Internet: LTG Aktiengesellschaft Grenzstrasse, D-0 Stuttgart PO Box 0 0 2, D-00 Stuttgart Germany Tel: Fax: raumluft@ltg-ag.de Internet: DLD-USA-TP-01 (0/0) 1-1

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3 Diffusers are decisive in the performance of air conditioning and ventilation systems in rooms Application The Industrial Air Diffuser Type DLD has been designed specifically for production buildings characterized by large production equipment with thermal effect caused by high heat loads from machines or an extreme length/ width of the hall (Type DLD.../H) where standard ventilation from the hall s side walls will provide insufficient cooling. This diffuser is however suitable for installation close to the occupied zone (Type DLD.../N and DLD.../K). Depending on the type, the installation of the Industrial Air Diffuser DLD may be performed either between the craneway and the hall ceiling at a height of...12 m or underneath the craneway at a height of... m. Advantages - One diffuser for any installation height providing both cooling and heating. - Heavy-duty air diffuser with high heating and cooling capacity. - Large range of adjustment. - Low air speed in the occupied zone. - Good penetration into the occupied space in both heating and cooling mode. - Modular construction meeting individual requirements, e.g. when changing operating conditions. - Adjustable air jet : electrical, manual or pneumatic actuator. Industrial Air Diffuser Type DLD with nozzle facing E LTG Incorporated PO Box 288 Spartanburg, SC 20/USA 8/ -0 Fax 8/ - DLD -USA -TP (0/0) e -mail: info@ltg -Inc.net Internet: -Inc.net Former editions are invalid. Subject to technical modifications.

4 Operation The air diffuser comprises a cylindrical perforated sheet metal casing and integrated nozzle. The supply air enters the casing through a honeycomb flow guide and is deflected when contacting the interior orifice plate. Thus, the flow pattern is standardized even when branching pieces and elbows are used. Cooling mode In the cooling mode, the air is diffused horizontally. A wide radial spreading of the cold air ensures that drafts in the occupied zone are avoided. Heating mode In the heating mode, the air discharged out downwards. An increased flow pulse ensures that the heated air reaches the occupied zone. With a supply air temperature higher than the ambient air temperature, the increased flow pulse is achieved through opening one of the nozzles pointing downwards. The penetration depth may be continously adjusted depending on the temperature difference between the supply air and the ambient air, thus ensuring good penetration into the occupied zone. Continous adjustment may be realized manually, pneumatically or electrically. Installation The diffuser can be mounted on a duct bend or take -off below the main duct. In addition to plug and flange connections, a METU quick-acting clamping device is also available. Air flow during cooling Air flow during heating Industrial Air Diffuser Type DLD.../D/.. with nozzle and nozzle facing (option) 8 DLD 00D/H/F craneway supply air duct DLD 00D/N/F DLD 00D/N/W radial air spreading E LTG Incorporated PO Box 288 Spartanburg, SC 20/USA 8/ -0 Fax 8/ - DLD -USA -TP (0/0) e -mail: info@ltg -Inc.net Internet: -Inc.net Former editions are invalid. Subject to technical modifications.

5 Product range Size: Ø 00 mm; Ø 00 mm; Ø 0 mm Type: D = with nozzle Installation H = high (with nozzle) height: N = low (standard version) K = low (for low-activity workplaces) Installation type F = 0_, freely suspended W = 180_, wall or column mounted Duct plug connection connection: flange METU Surface finish: powder coated - similar to RAL, galvanized Adjustment: manual, pneumatic, electric 80 D N D H L Dimensions / Performance data Installation height DLD.../D/N/.. Installation type 00/D/N/W 00/D/N/W 00/D/N/F 00/D/N/F Size D Nenn [mm] Height L [mm] Connecting diameter D [mm] Installation height H [m] Recommended flow rate V [m /h] Cooling mode t max [K] Heating mode t max [K] Installation height DLD.../D/K/.. Installation type 00/D/K/W 00/D/K/W 00/D/K/F 00/D/K/F Size D Nenn [mm] Height L [mm] Connecting diameter D [mm] Installation height H [m] Recommended flow rate V [m /h] Cooling mode t max [K] Heating mode t max [K] Installation height DLD.../D/H/.. Installation type 00/D/H/W 00/D/H/F 00/D/H/F 0/D/H/F Size D Nenn [mm] Height L [mm] Connecting diameter D [mm] 2 Installation height H [m] Recommended flow rate V [m /h] Cooling mode t max [K] Heating mode t max [K] E LTG Incorporated PO Box 288 Spartanburg, SC 20/USA 8/ -0 Fax 8/ - DLD -USA -TP (0/0) e -mail: info@ltg -Inc.net Internet: -Inc.net Former editions are invalid. Subject to technical modifications.

6 Selection With a given installation height and flow rate per diffuser, the DLD dimensioning diagram may be used to determine the following values : - The recommended maximum temperature difference between the supply air and the ambient air in the occupied zone in the heating and cooling mode. - The sound power level based on which the sound pressure level may be determined for the occupied zone. - The static pressure loss for duct system calculation. - The radial air jet diffusion range. - The size of the ventilated hall area as a criterion for the arrangement of the air diffusers in the hall. The minimum distance between two diffusers should not be lower than the diffusion range. Example in the diagram The example refers to the diagram DLD.../D/N/W on the following page. Given: Factory building section (s. sketch) Depth of section: m Max. cooling load Q Kmax : Max. heating load Q Hmax : Installation height H: 28 2 kw 0 kw (heating mode) m Bild: Aufrißskizze eines Industriehallenabschnitts Factory building layout Unknown values: Flow rate V [m /h] Sound power level L WA [db(a)] Static pressure loss p [Pa] Max. air jet diffusion A max [m] Ventilated hall area F [m 2 ] L PA T N = Reverberation time (abt. 1. s) V = Hall segment volume L PA = L WA +lgt N - lg V + 1 = L WA = L WA - (acc. to the example given) 1. H = m 2. t max = 1 K (heating) Reading:. V = 200 m /h Max. heating capacity/diffuser Q Hmax =csρsvs t = 0 S 1.1 S 1 = 1 kw Total capacity = 2 kw = 2 kw < 0kW heating mode O.K.. L WA = db(a) /diffuser L PA =L WA - lg + 1 = db(a). p =88Pa. A max =.2m. F = 0. m 2 required cooling capacity/diffuser =2 kw/ = 0 W 8. Selected: t =-8K Q Kmax =csρsvs t = 80 W Total cooling capacity = S 80 W = 2. kw > 2 kw O.K.. c max = cm/s (cooling mode) E LTG Incorporated PO Box 288 Spartanburg, SC 20/USA 8/ -0 Fax 8/ - DLD -USA -TP (0/0) e -mail: info@ltg -Inc.net Internet: -Inc.net Former editions are invalid. Subject to technical modifications.

7 Selection diagram DLD.../ D/ N/... F[m 2 ] , 200 DLD.../D/N/F F[m 2 ] c V[m /h] max [cm/s] 0 t max [K] cooling H=m cooling mode Full load setting DLD.../D/N/W DLD t max [K] cooling H=m DLD p [Pa] heating mode H[m] L./N/F WA =L./N/W WA -2dB Full load cooling ρ 1.1 kg/m Full load setting DLD.../D/N/W DLD.../D/N/F Type DLD.../ D/ N/... The Air Diffusers Type DLD.../D/N/W and.../d/n/f are suitable for low installation heights of - m and high cooling loads. Sizes 00 and 00 are available with a diffusion angle of 180_ for wall/column mounting or alternatively with a diffusion angle of 0_ when freely suspended. E LTG Incorporated PO Box 288 Spartanburg, SC 20/USA 8/ -0 Fax 8/ - DLD -USA -TP (0/0) e -mail: info@ltg -Inc.net Internet: -Inc.net Former editions are invalid. Subject to technical modifications.

8 Selection diagram DLD.../ D/ K/... F[m 2 ] DLD.../D/K/W DLD , 0 20 L./K/F =L./K/ -2dB WA WA Full load cooling ρ 1.1 kg/m DLD.../D/K/F F[m 2 ] c V[m /h] max [cm/s] H=m - t max [K] cooling 1 cooling mode Full load setting heating mode Full load setting H=m t max [K] cooling 1 - H[m] p [Pa] DLD.../D/K/W DLD.../D/K/F Type DLD.../ D/ K/... The Air Diffusers Type DLD.../D/K/W and.../d/k/f are specifically designed for workplaces with a low activity level and allow very low air speeds in the occupied zone at a low installation height. Sizes 00 and 00 are available with a diffusion angle of 180_ or 0_. E LTG Incorporated PO Box 288 Spartanburg, SC 20/USA 8/ -0 Fax 8/ - DLD -USA -TP (0/0) e -mail: info@ltg -Inc.net Internet: -Inc.net Former editions are invalid. Subject to technical modifications. 8

9 Selection diagram DLD.../ D/ H/... p F[m 2 [Pa] ] DLD.../D/H/W /H/./H/F L =L +2dB WA WA 20 Full load cooling ρ 1.1 kg/m DLD.../D/H/F F[m 2 ] DLD.../D/H/F DLD.../D./F (view from the bottom) DLD (side view) A ventilated area F[m 2 ] radial air spreading A[m] 8 H[m] DLD.../D/H/W t max [K] cooling = - t max [K] cooling = - DLD 00/D/H DLD 00/D/H DLD 0/D/H Type DLD.../ D/ H/... The Air Diffuser Type DLD.../D/H is suitable for significantly higher temperatures of the supply air in the heating mode and for suspension heights of to 12 m, but it may equally be used at lower installation heights in case of high heating loads and low flow rates. Depending on the flow rate, size 00, 00 or 0 may be selected. Apart from the freely suspended version (Type DLD.../D/H/F) with a diffusion angle of 0_,size 00 is also available in a version for wall/column mounting (Type DLD.../D/H/W) with a diffusion angle of 180_. E LTG Incorporated PO Box 288 Spartanburg, SC 20/USA 8/ -0 Fax 8/ - DLD -USA -TP (0/0) e -mail: info@ltg -Inc.net Internet: -Inc.net Former editions are invalid. Subject to technical modifications.

10 Air Flow Control Unit Type LSE Application In order to obtain a nearly constant air penetration, while considering the temperature difference between the room air and the supply air, the heating and cooling mode flow directions are automatically controlled. Operation Room temperature and supply air temperature are measured through one sensor each and transmitted to the Air Flow Control Unit LSE capturing and analyzing the analog signals. Depending on the set parameters, an analog output voltage of 0... V is released to the DLD diffusers to activate the actuators. Design The Air Flow Control Unit LSE comprises a casing for installation in the switch cabinet, a room temperature sensor for installation in the occupied zone and a duct temperature sensor for integration into the supply air run. Wiring is by the installer according to the diagram. Performance data Casing: temperature resistant up to +0 _C. Protective system: IP 20 Dimensions: 0xxmm Max. temperature difference between room air and supply air +/ - K Supply voltage: 2 VAC Analog output: 0... Volt DC Temperature sensor: Ni V~ 0 Hz L1 N 220 V~ 0 Hz M L1 L2 N N T T 2 ϑ ϑ Supply air 2 1 M 8 = = = = M M M M y ~ y ~ y ~ y ~ 20 V~ 2 V~ 0 VA ~ y y ~ y ~ y y y ~ ~ M Air Flow Control Unit Type LSE (Ident No. 0.) Junction box with transformer 22 V~/2 V~ (Ident-No. 0.) Room temperature sensor Supply air temperature sensor Manual operating unit (Ident No. 2.)... Actuator KM 2 S... Room t -Controller Supply air Special version: Transformer and Air Flow Control Unit together in one casing, to control up to actuators (Ident No. 28.1). Protective system: IP. Dimensions: 0 x 200 x mm. M 1 Manual operation E LTG Incorporated PO Box 288 Spartanburg, SC 20/USA 8/ -0 Fax 8/ - DLD -USA -TP (0/0) e -mail: info@ltg -Inc.net Internet: -Inc.net Former editions are invalid. Subject to technical modifications.

11 Air Flow Control Unit Type LSE Setting Various potentiometer settings are possible: - Characteristics for cooling mode and heating mode can be changed. - Min./max. boundaries of the actuating signal - Shifting of the characteristic s breakpoint Potentiometers are factory-set. Potentiometer occupancy for characteristic trimming: Sensor balancing (compensation of resistance tolerances) Slope of the upper characteristic (cooling) Slope of the lower characteristic (heating) Zero shift (isothermal operation) Variation of full-load setting (cooling) Variation of full-load limit (heating) Controller output voltage [VDC] Characteristic at standard setting heating cooling Temperature difference t Su - t Ro [K] 2 1 Potentiometer for characteristic trimming Air Flow Control Unit type LSE VAC NI 00 Supply air NI 00 Room Control aut. man. Manual 2VAC 0... VDC Potentio - meter M E LTG Incorporated PO Box 288 Spartanburg, SC 20/USA 8/ -0 Fax 8/ - DLD -USA -TP (0/0) e -mail: info@ltg -Inc.net Internet: -Inc.net Former editions are invalid. Subject to technical modifications. 11

12 Nomenclature DLD... /. /. /. /. /. /... /. / Size: Ø 00, 00, 0 mm Type: D = with nozzle Installation height: H = high N = low (standard) K = low (for low-activity workplaces) Installation type: W = wall -mounted (diffusion angle 180_) F = freely suspended (diffusion angle 0_) Duct connection S = plug connection F = flange M = METU (recommended standard) Adjustment: mk= manually adjustable with crank (optional) mv= manually adjustable with conternut (preset) p = pneumatic 0,2... bar) e = electric (2 VAC) Surface: V = galvanized P = powder coated similar to RAL, (please indicate color code) Nozzle facing: J = with O = without E LTG Incorporated PO Box 288 Spartanburg, SC 20/USA 8/ -0 Fax 8/ - DLD -USA -TP (0/0) e -mail: info@ltg -Inc.net Internet: -Inc.net Former editions are invalid. Subject to technical modifications. 12