Heat recovery systems - Free hot water by total recovery of the heat rejected by the cooling units
Summary : - Why Boostherm? For whom? - Heat recovery module functioning - Highlights & benefits - Boostherm range - Sizing, heat potential and savings - Case study
Why Boostherm? Cooling units produce large amounts of heat; this heat is lost, rejected in the ambient air by the fans often causing nuisances. The water-heaters electrical consumption represent an important part of the total energy bill. Energy prices rising and carbon footprint awareness are challenges that current technological advances are able to take up in a sustainable and profitable way.
Why Boostherm? Few examples of potential savings: Negative refrigeration cabinet cooling unit 1.5hp (CAJ2464 / 739 W) : 450 litres hot water daily 6 750 kwh annual savings (684 in France) Positive cold room cooling unit 1 1/8 hp (CAJ9513 / 1 638 W) : 700 litres hot water daily 10 500 kwh annual savings (1 064 in France) Negative cold room cooling unit 3 hp (TFH2511 / 1 817 W) : 950 litres hot water daily 14 250 kwh annual savings (1 444 in France) Positive cold room cooling unit 10 hp (ZB75 / 15 900 W) : 6 500 litres hot water daily 97 500 kwh annual savings (9 875 in France) Calculation bases: Hot water production based on 15 hours a day cooling unit operation. Annual savings based on six working days per week x 50 weeks. French kwh price: 10.13 cents (01/01/2012 EDF price excluding VAT)
Working principle : Boostherm recovers the heat from the cooling units to heat up water for free
Boostherm : for Whom? The system is intended to any small, medium-sized and larger companies who have on one hand a need for cooling (ex: cold rooms, refrigerated cabinets, air conditioning) and on the other hand a need for heating (hot water production, premises heating). Hotels, restaurants, bakeries, fast foods, catering industries, large kitchens, supermarkets, food processing
Functioning : Introduction : The condensation Condenser inlet 70 C T C Desuperheating Traditional heat recovery systems (desuperheaters) only recover desuperheating 40 C Condensation Subcooling Boostherm recovers all latent heat of condensation and regulates condensing temperature 10/15% 80/85% 5% Condenser outlet Energy R404A example Ambient temperature 20 C
Schematic diagram: Boostherm uses Dual Condense Technology (DCT) : 1- The heat recovery module totally condenses the refrigerant gas by using the cold water in the bottom part of the tank. All the heat rejected by the cooling unit is recovered to heat up water very quickly at 55 C whatever the ambient temperature. Cooling unit fans are stopped.
Patented exclusive system: 2- When all the water has been preheated, the fans turn on. The heat recovery module continues to heat up water (gas desuperheating); water can reach a temperature of 65/70 C depending on ambient temperature.
User benefits: - Significant energy bill reduction: quick return on investment. - Reduces cooling units nuisances (fan noise, heat rejected). - Free hot water production in large quantities at high temperature. - Recycles and valorizes wasted thermal energy: eco-friendly concept.
Highlights 5 &10 kw modules Stainless steel box for better protection Insulated heat exchanger for maximum performances Double wall high pressure heat exchanger for maximum safety Safety pressure switch for trouble free operation Adjustable thermostatic/pressostatic valve Scaling warning LED Electrical box with Normally Closed fan relay 20, 45 & 70 kw modules Priority to refrigeration: The cooling units operates normally in case of an anomaly on the heat recovery. * Max pressure: 45 bars / 155 C Test pressure: 75 bars
Highlights: One tank only for preheated water and hot water 2 thermometers Temperature up to 80 C Industrial Manufacturing 7 year warranty Quick-drain valve to remove deposits Anti-legionella conception Preheated water diffuser for optimal stratification An industrial water tank specially developed for heat recovery 1. Heat recovery area 2. Boost resistance (option) 3. Hot water stock area
Boostherm range : Heat recovery module: o 5 standards models for cooling units from 1 to 70 kw o Above: custom sizing Boostherm water tanks : o Combined water tanks preheated water / hot water o 300 / 500 / 750 / 1000 litres available o Custom sizing on request Standard water tanks: o Used as buffer tanks o 100 / 200 / 300 litres available
Sizing: - Determine the heat load at the condenser based on the maximum evaporating temperature on normal operation. - Select the corresponding Boostherm module.
Heat potential & savings: Annual savings based on six working days per week x 50 weeks. French kwh price: 10.13 cents (01/01/2012 EDF price excluding VAT)
Case study: Chalet des Alpes 42660 Le Bessat 2 positives cold rooms (2 cooling units of ½ hp) 1 negative cold room (1 cooling unit of 3 hp) 1 Boostherm module on each cooling unit 2 buffer tanks providing 2 premises in preheated water 1200 litres of preheated water at 55 C for free every day.