WATER-TO-WATER HEAT PUMPS
Advanced control algorithms combine inverter frequency output with motor input logic to minimise mechanical part stress, resulting in best compression performance and high chiller reliability. The compressor is equipped with bearings with oversized rollers, oil pressure lubricated for reliable and durable operation, even at maximum load. Other advantages: - If a fault occurs e.g. if the condenser is fouled or at very high water temperature, the compressor does not switch off, but continues operation at reduced capacity (unloaded mode). - The silencer in the discharge line considerably reduces discharge gas pulsations for much quieter operation. - The condenser includes an oil separator that minimises the amount of oil in circulation in the refrigerant circuit and re-directs it to the compressor function.
Carrier products and green building certification
Introduction Energy usage and costs combined with increasing concerns to reduce CO2 emissions are among the most important environmental challenges in today’s world. New and existing buildings are one area where energy efficiency and the conservation of natural resources is a high priority. Green building design Design teams increasingly focus on designing “green buildings” to address today’s energy efficiency and environ-mental sustainability needs. A green building is a building that is environmentally sustainable and has been designed, constructed and is operated to minimise the total impact of the environment. The underlying principles of this approach: the resulting building will be economical to operate, offer increased comfort and create a healthier environment for the people who live and work there, increasing productivity. The main strategies* adopted to achieve a green building design include: - Sustainable Sites (SS) - Water Efﬁciency (WE) - Energy & Atmosphere (EA) - Materials & Resources (MR) - Indoor Environmental Quality (IEQ) - Innovation in Design (ID) Green building certification A number of green building certification programs exist in the market and offer third-party assessment of green building measures for a wide variety of building types. Some examples of existing programs include: - LEED (Leadership in Energy & Environmental Design) - BREEAM - ESTIDAMA PEARL - NABERS (National Australian Built Environment Rating System) HVAC products and systems Carrier HVAC products are built to high energy efficiency and indoor air quality standards. They assist building designers and owners by offering high-performance heating, ventilation, and air conditioning (HVAC) systems and products with reduced energy consumption and enhanced indoor air quality for the occupants, contributing to optimised green building performance. Each certification program may address and prioritise different green building design strategies according to local and regional needs and legislation. The following example looks at how Carrier’s new 30XWHV range helps customers involved in LEED building certification.
* Source USGBC: LEED
R-134a refrigerant - HFC-refrigerant with zero ozone depletion potential Leak-tight refrigerant circuit - Reduction of leaks as no capillary tubes and ﬂare connections are used - Veriﬁcation of pressure transducers and temperature sensors without transferring refrigerant charge - Discharge line shut-off valve and liquid line service valve for simpliﬁed maintenance.
Remote management (EMM option)
The Energy Management Module offers extended remote control possibilities: - Room temperature: permits set-point reset based on the building indoor air temperature (with Carrier thermostat) - Set point reset: ensures reset of the cooling set-point based on a 4-20 mA or 0-10 V signal - Demand limit: permits limitation of the maximum chiller power or current based on a 0-10 V signal - Demand limit 1 and 2: closing of these contacts limits the maximum chiller power or current to two predeﬁned values - User safety: this contact can be used for any customer safety loop; openi