for FAST AND FLEXIBLE HEATING

Transcription

1 for FAST AND FLEXIBLE HEATING A heat exchanger is used to transfer heat energy from one medium to another without the two media being mixed. Pahlén heat exchangers with cross flow operation produce high output and have excellent heat transfer capability. All the models can be installed and connected to electric, firewood, pellet or oil-fired boilers, and to heat pump and solar panel systems. Pahlén heat exchangers are available as tube and as spiral heat exchangers and they are optimized for high capacity and low pressure drop. Both are cross flow models, that is the hot medium flows in the opposite direction to the cold medium, which gives a maximum output. The heat exchangers are designed and made of materials that permit their use for a wide variety of needs and in many different types of installations. Maxi-flo is a tube heat exchanger with excellent heating properties. It is made of acid-proof stainless steel AISI 316L for optimum service life. Simple installation using the stainless steel adjustable attachments that are included. hi-flow is a spiral heat exchanger made of AISI 316L acid-proof stainless steel or of titanium, for application areas where there is a considerable risk of corrosion. Titanium is the ideal material where salt water or a salt generator is used. Adjustable stainless-steel attachments are included. hi-temp is a spiral heat exchanger made of thermoplastic with a high glass content for extra durability, and with a spiral of AISI 316L acid-resistant stainless steel or titanium for the most demanding installations where there is a high risk of corrosion, such as in swimming pools with salt water or where a salt generator/chlorinator is used. aqua mex is a new heat exchanger from Pahlén which is equipped with digital control and a circulation pump. It is made of fibreglass reinforced thermoplastic and has a coil for the heating agent that is made of AISI 316L acid-resistant stainless steel or titanium, corrosionresistant materials designed for increased service life. The heat exchanger has straight flow. Hot water and pool water plumbing and installation of the electrical controls are simple. plate HEAT EXCHANGER The heat transfer surface consists of thin profiled metal plates made of AISI 316L acid-resistant stainless steel, one on top of the other. The high efficiency rating of the heat transfer process makes this option extremely efficient and in addition easy to install in areas with limited space. 26 heat exchanger

2 Maxi-flo Item no MF kW Acid-proof stainless steel AISI 316L - For optimum quality and life. Precision-welded outer jacket - For optimum finish and long life. 37 seamless pipes equipped with flow restrictors - For high heat transfer capacity. Adjustable brackets of acid-resistant stainless steel - For simpler and more flexible installation. Four sizes: 40, 60, 75 and 120 kw - For swimming pools of up to 450 m 3. Inlet Maxi-Flo Circulation pump Item no. A B C D E F ½ ½ ½ MF , , MF , , MF , , MF , ,4 Vertical installation Maxi-Flo Maximum pressure secondary circuit (pool water) and primary circuit (hot water) is 10 bar. Maxi-Flo can be connected in series when needed. Item no. for coupling heat exchanger 27

3 hi-flow Item no HF 75-75kW Acid-proof stainless steel AISI 316L - For optimum quality and life. Precision-welded outer jacket - For optimum finish and long life. Coil for heating medium - For installations that operate under high pressure. Pocket for probe - Simple installation of external temperature sensor. Adjustable brackets of acid-resistant stainless steel - For simpler and more flexible installation. Four sizes: 13, 28, 40 and 75 kw - For swimming pools of up to 300 m 3. Inlet Hi-Flow Circulation pump Item no. A B C D E F ½ ¾ ½ ¾ ½ The maximum pressure for the secondary circuit (pool water) is 10 bar and for the primary circuit (hot water) 60 bar HF , , HF , , HF , , HF , ,9 Capacity at 70 temperature difference 28 heat exchanger

4 hi-flow titanium Item no T40-40kW Titanium - Best possible quality and life, for swimming pools with salt water or where a salt generator/chlorinator is used. Coil for the heating medium - For installations that operate under high pressure. Connections with interior thread (secondary side) - Several connection possibilities. Pocket for probe - Simple installation of external temperature sensor. Adjustable brackets of acid-resistant stainless steel - For simpler and more flexible installation. Three sizes 28, 70 and 75 kw - For swimming pools of up to 300 m 3. Inlopp Hi-Flow Circulation pump Item no. A B C D E F G ½ ½ ½ The maximum pressure for the secondary circuit (pool water) is 5 bar and for the primary circuit (hot water) 30 bar T , , T , , T , ,9 Capacity at 70 temperature difference heat exchanger 29

5 hi-temp Item no HT 75-75kW Outer jacket of thermoplastic - High quality and long service life. Hot water coil made of acid-resistant stainless steel - For good corrosion protection. Integrated wall-mounting - For simpler installation. Slip connections for bonding of Ø50 mm pipes - For simple pipe installation. Two sizes 40 and 75 kw - For swimming pools of up to 300 m 3. Inlet Hi-Temp Circulation pump Item no. A B C The maximum pressure for the secondary circuit (pool water) is 4 bar and for the primary circuit (hot water) 5 bar HT , , HT , ,0 30 heat exchanger

6 hi-temp titanium Item no HTT 75-75kW Outer jacket of thermoplastic - High quality and long service life. Hot water coil made of titanium - For the most demanding installations where there is a risk of corrosion. Integrated wall-mounting - For simpler installation. Slip connections for bonding of Ø50 mm pipes - For simple pipe installation. Two sizes 40 and 75 kw - For swimming pools of up to 300 m 3. Inlet Hi-Temp Circulation pump Item no. A B C The maximum pressure for the secondary circuit (pool water) is 4 bar and for the primary circuit (hot water) 5 bar HTT , , HTT , ,4 heat exchanger 31

7 plate heat exchanger Item no CB14-20H Item no CB27-24M Profiled metal plates made of acid-proof stainless steel placed close to one another - High efficiency rating and effective heat transfer. The closely-packed metal plates form thin channels - Creates a small and compact heat exchanger. The heat exchanger has no seals - Suitable for processes with high and low temperature/high and low pressure. Sizes from 40 kw to 1000 kw - Suits all installations. d e A b S4 S1 Item no. Model a b c d e A CB14-20H CB14-40H a c CB27-24M CB27-50M S3 S CB76-30L CB76-40L Item no. Model Capacity Primary side, hot water Secondary, cold water Max pressure bar Connection kw kbtu/h l/min press. drop H(m) l/min press. drop H(m) Primary Secondary Primary S3, S4 Secondary S1, S CB14-20H ,7 23 1, ¾ ¾ CB14-40H ,8 43 1, ¾ ¾ CB27-24M ,8 57 1, ¼ CB27-50M , , ¼ CB76-30L , , CB76-40L , , heat exchanger

8 dimensioning of heat exchangers The capacity of a heat exchanger varies according to the liquid flow through the primary (hot) and the secondary (cold) circuits and the temperature difference between both media. From the table of capacities a nominal thermal output for each heat exchanger may be obtained. This output is based upon given liquid flow through both circuits, which is quoted in the table, and a temperature difference between the incoming primary and secondary media. As an example heat exchanger type MF 135 has a thermal output of 40 kw when the liquid flow is 25 l/min on the primary side, 200 l/min on the secondary side, and the temperature difference between both incoming media is 60 C. By the use of diagrams A and B, the thermal output may be calculated for other liquid flows and temperature differences than those quoted in the table. Diagram A. Nominal heat effect % 100 Diagram A shows the variation in thermal output with changes in temperature differences between the incoming media. This output is virtually proportional to this temperature difference. 50 Difference in temperature between incoming warm water (primary) and incoming cold water (secondary). T 60 C T 70 C C C Diagram B. Nominal heat effect % Diagram B Represents the variation in thermal output with changes in liquid flow. This diagram is based upon the nominal values given in the table of capacities, which values represent 100% on the graph. If the flow in both primary and secondary circuits is in the same relationship to the nominal values, then the rate of the thermal output from the heat exchanger may be read from the graph. If, however, the flow in both circuits do not have the same relationship to the nominal values, the thermal output can be approximated as the average of the two separate readings from the graph. Nominal flow % Theoretical heat calculation 1. Power required to increase water temperature by T degrees in a fixed time (t), assuming no heat loss. Formula: P = 1.16 x T x V t 2. Time taken to increase water temperature by T degrees from a fixed power input, assuming no heat loss. Formula: t = 1.16 x T x V P P = Power in kw t = Time in hours T = Temperature difference C 1.16 = Constant V = Volume in m 3 Example: Time taken to heat 30 m 3 of water from 5 C to 25 C with a 6 kw heater, assuming no heat loss: t = 1.16 x (25-5) x 30 =116 hours 6 heat exchanger 35