CIRCULATION SYSTEM www dabpumps com 1 CIRCULATION SYSTEM

CIRCULATION SYSTEM www. dabpumps. com 1

CIRCULATION SYSTEM: HEATING & AIR CONDITIONING Wet rotor circulators for heating and air conditioning system EVOSTA (only heating) EVOTRON APPLICATIONS: § Circulate water in a closed circuit in both heating and air conditioning system § Used also in solar heating circuits www. dabpumps. com 2

CIRCULATION SYSTEM: HEATING & AIR CONDITIONING Wet rotor circulators for heating and air conditioning system EVOSTA EVOTRON (only heating) EVOPLUS SMALL VS Main features: ü Flow rates from 1 to 9, 6 m 3/h and with maximum differential pressure head of 11 m, depending of the model for domestic and residential application. ü Temperature range from -10°C to +110°C ü The pumped liquid must be clean, free of oily substances and chemically neutral. ü Motor casing in die cast aluminum impeller in engineering polymer ULTEM ü Threaded or flanged unions depending on the model www. dabpumps. com 3

MAIN COMPONENTS OF A HEATING SYSTEM www. dabpumps. com 4

MAIN COMPONENTS OF A HEATING SYSTEM v Generation: Converting the energy carrier v Accumulation: Temporal decoupling of generation and use of heat v Distribution: Transport of heat in the building v Emission: Heat transfer in environment v Regulation: Decide when, where and how much heat issue in environment It has nothing to do with the regulation of the generator www. dabpumps. com/d. training 5

HYDRAULIC CIRCUIT v To transport the heat it’s necessary to spin the water along delivery and return BOILER v For each lap, the water carries a quantity of heat proportional to the difference between the supply temperature and the return temperature v If the temperature difference between supply and return is high enough to run a little water BOILER v To spin the water in a circuit must be a push (pressure) sufficient to overcome the resistance (pressure losses of pipes and devices) v To adjust the power output of the system we will have to adjust the water flow and water temperatures or heat exchange to the radiators BOILER (fan) www. dabpumps. com/d. training 6

HYDRAULIC CIRCUIT Pressure losses Pressure losses www. dabpumps. com/d. training 7

SYSTEM FLOW RATE CALCULATION www. dabpumps. com 8

SYSTEM FLOW RATE CALCULATION Temperature delta Legislation stipulates that for every building it has to be assigned a “heat-loss factor”; the law establishes also a maximum room temperature of 20°C. To ensure the room temperature is kept at 20°C, a balance must be established between the “heat-loss factor” and the building overall heat-drop. www. dabpumps. com 9

SYSTEM HEAD CALCULATION The system head is calculated by adding together the localized friction loss in the heating system. Example: H = Hed ∙ K • Hed = building height of 9 m • K = let’s assume this is 25% - 30% of the building’s height 1. H = 9 x 0. 30 = 2. 7 m 2. H = 9 x 0. 25 = 2. 25 m www. dabpumps. com 10

SYSTEM HEAD CALCULATION www. dabpumps. com 11

THE HYDRAULIC PROBLEM When the flow rate decreases, the pressure losses decrease dramatically Flow rate = 1000 l/h Pressure losses = 30 mm. w. c. Flow rate = 500 l/h Pressure losses = 7, 5 mm. w. c. The pressure losses depend on the square of the flow www. dabpumps. com 12

MAIN REGULATION MODES WITH ELECTRONIC CIRCULATORS CONSTANT differential pressure ΔP-c PROPORTIONAL differential pressure ΔP-c CONSTANT curve speed www. dabpumps. com 13

CONSTANT DIFFERENTIAL PRESSURE Q = Variable H = Constant This control mode is particularly useful in: v heating and conditioning systems with low pressure loss v two-pipe central heating systems with thermostatic valves and head ≤ 2 m v single-pipe central heating systems with thermostatic valves v systems with natural circulation v installations having primary circuit pumps with low pressure loss v sanitary recirculation systems with thermostatic valves Set by scrolling through the Evoplus menu or with the external signal (0 -10 V or PWM)* *MULTIFUNCTION module requested for this application on EVOPLUS SMALL www. dabpumps. com 14

PROPOTIONAL DIFFERENTIAL PRESSURE Q = Variable H = Variable This control mode is particularly useful in: v heating and air conditioning systems with high pressure loss v double-pipes central heating systems with thermostatic valves and head ≥ 4 m v heating systems with secondary differential pressure regulators v installations having primary circuit pumps with high pressure loss v sanitary recirculation systems with thermostatic valves Set by scrolling through the Evoplus menu or with the external signal (0 -10 V or PWM)* *MULTIFUNCTION module requested for this application on EVOPLUS SMALL www. dabpumps. com 15

PROPOTIONAL DIFFERENTIAL PRESSURE Q = Variable H = Variable www. dabpumps. com 16

CONSTANT CURVE H Curve limit Constant speed The operating curve can be adjusted manually Q setting the percentage reduction factor. The value 100% indicates the “Curve Limit”. This control mode is particularly useful in: v heating and air-conditioning systems with constant flow Set by scrolling through the Evoplus menu or with the external signal (0 -10 V or PWM)* *MULTIFUNCTION module requested for this application on EVOPLUS SMALL www. dabpumps. com 17

CONSTANT CURVE www. dabpumps. com 18

CONSTANT DIFFERENTIAL PRESSURE CONTROL MODE ELIMINATED THE NOISE THANKS TO AUTOMATIC ADJUSTMENT OF THE CIRCULATION www. dabpumps. com 19

PROPOTIONAL DIFFERENTIAL PRESSURE ELIMINATED THE NOISE THANKS TO AUTOMATIC ADJUSTMENT OF THE CIRCULATION www. dabpumps. com 20

SYSTEM DESIGN EXAMPLES 1 SINGLE-PIPE HEATING SYSTEM (RADIATORS IN SERIES) www. dabpumps. com 21

SYSTEM DESIGN EXAMPLES 2 TWO-PIPE HEATING SYSTEM (RADIATORS IN PARALLEL) www. dabpumps. com 22

SYSTEM DESIGN EXAMPLES 3 UNDER-FLOOR HEATING SYSTEM www. dabpumps. com 23

ELECTRONIC CIRCULATORS MODELS www. dabpumps. com v Flow rate → 0, 6 – 3, 5 m 3/h v Head max → 7 m v Flow rate → 0, 6 – 4, 2 m 3/h v Head max → 4 – 8 m v Flow rate → 4, 2 – 9, 6 m 3/h v Head max → 4 – 11 m 24

ELECTRONIC CIRCULATORS MODELS TWIN www. dabpumps. com v Flow rate → 4, 2 – 72 m 3/h v Head max → 4 – 18 m v Flow rate → 2, 4 – 9, 6 m 3/h v Head max → 4 – 11 m v Flow rate → 4, 2 – 72 m 3/h v Head max → 4 – 18 m 25

CIRCULATORS MODELS FOR SANITARY WATER VS SAN www. dabpumps. com v Flow rate → 0, 6 – 5, 4 m 3/h v Head max → 0, 8 – 6, 5 m v Flow rate → 0, 6 – 4, 2 m 3/h v Head max → 4 – 8 m v Flow rate → 1, 8 – 42 m 3/h v Head max → 4 – 15 m 26

FLOW RATE CALCULATION Example: Assume you need a circulator for a standard heating system. We know that the boiler heating capacity is 10000 kcal/h and that system pressure drop is about 4 m. Data : System pressure drop = 4 m Boiler capacity = 10000 kcal/h Considering a temperature difference between delivery and return = 20°C 1. Apply the formula for the flow rate: Suitable circulator = EVOTRON 40/130 or EVOSTA 40/70 www. dabpumps. com 27

IMPORTANT INFORMATION FOR THE INSTALLATION We recommend: § Install check valves in both the suction line and the delivery line § The terminal box must never be below the pump § 30% maximum glycol contents § In case of heat insulation, ensure the motor casing condensate discharge nozzles are not clogged § The circulator is maintenance free § The unit can be supplied complete with unions and other accessories www. dabpumps. com 28