Thermostatic Expansion valves, type TUA/TUAE REFRIGERATION AND AIR CONDITIONING. Technical leaflet

Transcription

1 Thermostatic Expansion valves, type A/AE REFRIGERATION AND AIR CONDITIONING Technical leaflet

2 Thermostatic expansion valves, type A/AE Contents Page Introduction... Features... Standard range... Technical data... MOP valves... Identification... Ordering... Capacity - R... Capacity - Ra... Capacity - RA/R... Capacity - RC... Capacity - RA... Design/Function... Dimensions and weight... RDAC Danfoss A/S (RC-CMS / HBS), -

3 Thermostatic expansion valves, type A/AE Introduction A/AE valves are made of stainless steel and are therefore very suitable for refrigeration systems in the food industry. A/AE valves are available with interchangeable orifice assembly in straightway versions. A/AE has been specially developed for soldering into hermetic refrigeration systems. A/AE valves can be used in many different forms of refrigeration systems, for example: Traditional refrigeration systems Heat pump systems Air conditioning units Refrigeration appliances Liquid coolers Ice cube machines Mobile refrigeration systems Features Interchangeable orifice assembly designed for: - Easy mounting - Optimized tightness Bimetal connections - Simple, fast soldering without the need for wet cloth or refrigeration pliers. Refrigerants R, Ra, RA, RC, R, and future refrigerants Capacities from. to kw (. to. TR) for R - Large capacity range in small steps Stable regulation Biflow function Compact design - small dimensions and low weight Stainless steel, solder version - high connection strength and tightness - capillary tube joints of high strength and vibration resistance Laser-welded, stainless steel thermostatic diaphragm element - optimum function - long diaphragm life - high pressure resistance Stainless steel double contact bulb - simple and fast installation - good heat transfer from pipe to bulb Adjustable superheat - accurate setting - adjustable in operation Available with MOP (Max. Operating Pressure) Wide range of valves Interchangeable filter for easy cleaning Standard range The standard range can be supplied in the following versions: Range N to + C, without MOP Range N to + C, MOP + C Range NM to C, MOP C Range B to C, without MOP Range B to C, MOP C Valves for special temperature ranges can be supplied. Static superheat (SS) (R, Ra, RA and RC): Valves without MOP Valves with MOP K K Static superheat (SS) (R): Valves without MOP Valves with MOP Capillary tube length Connections: Inlet Outlet. K. K m / in./ mm / in./ mm / in./ m Danfoss A/S (RC-CMS / HBS), - RDAC

4 Thermostatic expansion valves, type A/AE Technical data Max. bulb temperature C Max. valve body temp. Permissible working pressure C, short-lived peak C PS = bar Biflow operation With flow in the opposite direction, the rated capacity is reduced by up to %. AE with orifice, A valves (internal equalisation) and valves with MOP cannot be used for biflow operation. Max. test pressure p =. bar MOP valves When MOP valves are used, to avoid charge migration the bulb temperature must always be lower than the thermostatic element temperature. MOP-points Range N + C Range NM C Range B C Refrigerant MOP point for evaporating temperature t e and evaporating pressure p ) e t e = + C/+ F t e = C/+ F t e = C/ F R p e = psig/. bar p e = psig/. bar p e = psig/ bar Ra p e = psig/. bar p e = psig/ bar RA/R p e = psig/. bar p e = psig/. bar p e = psig/ bar RC p e = psig/. bar p e = psig/.bar p e = psig/ bar ) p e in bar gauge Identification Main valve data is given on the element (fig. ), on the valve body (fig. ) and on the bottom of the orifice assembly (fig. ). Example valve body AE = Type (E = external pressure equalisation) U = Code number Ra = Refrigerant MOP / + C = MOP-point in psig / C / + C = Evaporating temperature / + F PS bar/ MWP psig B in. range in C = Evaporating temperature range in F = Max. working pressure in bar/psig = Date marking (week, year, weekday B = Tuesday) = Normal flow direction = Connection in inches (mm = millimetres) Example orifice assembly = = number U = Code, orifice assembly incl. filter and gasket = Date marking (Week, Year ) Fig. Power element Fig. Valve body Fig. assembly RDAC Danfoss A/S (RC-CMS / HBS), -

5 Thermostatic expansion valves, type A/AE Ordering, components with solder x solder connections Thermostatic element, without orifice and filter, with bulb strap Refrigerant R Ra RA R RC A A A A AE AE AE AE A A A A AE AE AE AE A A A A AE AE AE AE A A A A AE AE AE AE Pressure equalization ) Ext. / in. Ext. mm Ext. / in. Ext. mm Ext. / in. Ext. mm Ext. / in. Ext. mm Ext. / in. Ext. mm Ext. / in. Ext. mm Ext. / in. Ext. mm Ext. / in. Ext. mm R, Ra, RA, RC, R Connections Code Capillary tube Range N Range NM Range B Inlet x outlet + C C C m in. mm Without MOP MOP + C MOP C Without MOP MOP C / x / U U x U U / x / U U x U U / x / U U x U U / x / U U x U U / x / U U x U U / x / U U x U U / x / U U x U U / x / U U x U U / x / U U U U U x U U U U U / x / U U U U U x U U U U U / x / U U U U U x U U U U U / x / U U U U U x U U U U U / x / U U x U U / x / U U x U U / x / U U x U U / x / U U x U U Danfoss A/S (RC-CMS / HBS), - RDAC

6 Thermostatic expansion valves, type A/AE Ordering (continued) assembly with filter and gasket. Range N: + C Rated capacity in kw ) Rated capacity in tons (TR) ) Code R Ra RA RC R R Ra RA RC R U U U..... U..... U U..... U..... U U U Range B: C ) Rated capacity Q nom. is based on: Evaporating temperature t e = + C for range N and C for range B Condensing temperature t c = + C Refrigerant liquid temperature t l = + C Opening superheat OS = K Rated capacity in kw ) Rated capacity in tons (TR) ) Code R RA RC R R RA RC R U U U U.... U.... U U..... U.... U..... U Spare parts Gasket ( pcs.): U Note: to ensure tightness the orifice gasket must be exchanged each time the orifice assembly is unscrewed. Filter ( pcs.): U RDAC Danfoss A/S (RC-CMS / HBS), -

7 Thermostatic expansion valves, type A/AE Capacity Capacity in kw for range N = + C and opening superheat OS = K R Evaporating temperature + C Evaporating temperature C Evaporating temperature C Evaporating temperature C Evaporating temperature C Evaporating temperature C Correction for subcooling t sub The evaporator capacity used must be corrected if subcooling deviates from K. The corrected capacity can be obtained by dividing the evaporator capacity by the correction factor given below. Note: Insufficient subcooling can produce flash gas. Correction factor for subcooling t sub t sub K K K K K K K K K K Correction factor.. Selection example Refrigerant = R Evaporating temperature t e = C Pressure drop in valve p = bar Subcooling t sub = K Evaporator capacity = kw Correction value (table) = The corrected evaporator capacity thus becomes divided by = kw Since the expansion valve capacity must be equal to or slightly more than the corrected evaporator capacity of kw, a B/BE with orifice and a table capacity of kw would be a suitable choice. Danfoss A/S (RC-CMS / HBS), - RDAC

8 Thermostatic expansion valves, type A/AE Capacity (continued) Capacity in kw for range B = C and opening superheat OS = K R Evaporating temperature C Evaporating temperature C Evaporating temperature C Evaporating temperature C Evaporating temperature C Correction for subcooling t sub The evaporator capacity used must be corrected if subcooling deviates from K. The corrected capacity can be obtained by dividing the evaporator capacity by the correction factor given below. Note: Insufficient subcooling can produce flash gas. Correction factor for subcooling t sub t sub K K K K K K K K K K Correction factor.. RDAC Danfoss A/S (RC-CMS / HBS), -

9 Thermostatic expansion valves, type A/AE Capacity (continued) Capacity in kw for range N = + C and opening superheat OS = K Ra Evaporating temperature + C Evaporating temperature C Evaporating temperature C Evaporating temperature C Evaporating temperature C Evaporating temperature C Correction for subcooling t sub The evaporator capacity used must be corrected if subcooling deviates from K. The corrected capacity can be obtained by dividing the evaporator capacity by the correction factor given below. Note: Insufficient subcooling can produce flash gas. Correction factor for subcooling t sub t sub K K K K K K K K K K Correction factor.. Danfoss A/S (RC-CMS / HBS), - RDAC

10 Thermostatic expansion valves, type A/AE Capacity (continued) Capacity in kw for range N = + C and opening superheat OS = K RA/R Evaporating temperature + C Evaporating temperature C Evaporating temperature C Evaporating temperature C Evaporating temperature C Evaporating temperature C Correction for subcooling t sub The evaporator capacity used must be corrected if subcooling deviates from K. The corrected capacity can be obtained by dividing the evaporator capacity by the correction factor given below. Note: Insufficient subcooling can produce flash gas. Correction factor for subcooling t sub t sub K K K K K K K K K K Correction factor. RDAC Danfoss A/S (RC-CMS / HBS), -

11 Thermostatic expansion valves, type A/AE Capacity (continued) Capacity in kw for range B = C and opening superheat OS = K RA/R Evaporating temperature C Evaporating temperature C Evaporating temperature C Evaporating temperature C Evaporating temperature C Correction for subcooling t sub The evaporator capacity used must be corrected if subcooling deviates from K. The corrected capacity can be obtained by dividing the evaporator capacity by the correction factor given below. Note: Insufficient subcooling can produce flash gas. Correction factor for subcooling t sub t sub K K K K K K K K K K Correction factor. Danfoss A/S (RC-CMS / HBS), - RDAC

12 Thermostatic expansion valves, type A/AE Capacity (continued) Capacity in kw for range N = + C and opening superheat OS = K RC Evaporating temperature + C Evaporating temperature C Evaporating temperature C Evaporating temperature C Evaporating temperature C Evaporating temperature C Correction for subcooling t sub The evaporator capacity used must be corrected if subcooling deviates from K. The corrected capacity can be obtained by dividing the evaporator capacity by the correction factor given below. Note: Insufficient subcooling can produce flash gas. Correction factor for subcooling t sub t sub K K K K K K K K K K Correction factor.. RDAC Danfoss A/S (RC-CMS / HBS), -

13 Thermostatic expansion valves, type A/AE Capacity (continued) Capacity in kw for range B = C and opening superheat OS = K RC Evaporating temperature C Evaporating temperature C Evaporating temperature C Evaporating temperature C Evaporating temperature C Correction for subcooling t sub The evaporator capacity used must be corrected if subcooling deviates from K. The corrected capacity can be obtained by dividing the evaporator capacity by the correction factor given below. Note: Insufficient subcooling can produce flash gas. Correction factor for subcooling t sub t sub K K K K K K K K K K Correction factor.. Danfoss A/S (RC-CMS / HBS), - RDAC

14 Thermostatic expansion valves, type A/AE Capacity (continued) Capacity in kw for range N = + C and opening superheat OS = K RA Evaporating temperature + C Evaporating temperature C Evaporating temperature C Evaporating temperature C Evaporating temperature C Evaporating temperature C Correction for subcooling t sub The evaporator capacity used must be corrected if subcooling deviates from K. The corrected capacity can be obtained by dividing the evaporator capacity by the correction factor given below. Note: Insufficient subcooling can produce flash gas. Correction factor for subcooling t sub t sub K K K K K K K K K K Correction factor.. RDAC Danfoss A/S (RC-CMS / HBS), -

15 Thermostatic expansion valves, type A/AE Design/Function. Bulb with capillary tube. Thermostatic element with diaphragm. Setting spindle for adjustment of static superheat SS. assembly. Filter Fig. Fig.. Superheat Superheat See fig. SS = static superheat OS = opening superheat SH = SS + OS = total superheat Q nom = rated capacity Q max = maximum capacity Static superheat SS can be adjusted with setting spindle, see fig.. The standard superheat setting SS is K for valves without MOP and K for valves with MOP (except R). The opening superheat OS is K from when opening begins to where the valve gives its rated capacity Q nom.. Example Static superheat Opening superheat Total superheat SS = K OS = K SH = + = K Dimensions and weight Connection dimensions, see ordering table Fig.. Straightway Weight, kg Danfoss A/S (RC-CMS / HBS), - RDAC

16 Thermostatic expansion valves, type A/AE RDAC Danfoss A/S (RC-CMS / HBS), -