DIESEL GENSET FOR CHP of Sanitary Hot Water (SHW)
www.genesalenergy.com
COGENERATION
PROJECT NAME
Genset for cogeneration
POWER
60-66 kVA
TYPE
Enclosed 2900 mm
SPECIAL CONFIG
Genset for CHP of Sanitary Hot Water
GENESAL ENERGY has designed a diesel generator to supply green energy to the Island of Ons, one of the most beautiful tourist destinations in the region of Galicia in northwest Spain. The Island is a protected reserve within the National Park of the Illas Atlanticas, and due to its situation, it is completely isolated from the mainland power grid. The generator has been designed to supply energy for the camping site situated on the upper part of the island. The site occupies an area of 8,000sq metres with a capacity for 276 people. Considered the first self-sustainable camping site in the Galician region, the site already incorporates a system of solar panels to provide electricity. Yet, due to the limited hours of sunshine in this part of the world and the characteristics of the camping site, it has been deemed essential to ensure a round the clock power supply, and for that supply to be sustainable.
COGENERATION PROJECT SUMMARY A diesel genset built with a thermal application which includes heat exchanger plates and an exhaust gas exchanger to recover normal heat loss and use this to heat sanitary water. Taking in to account that this project was for an ecologically designated location, a low emissions engine is incorporated compliant to Stage III emissions rating.
PROJECT DESCRIPTION The genset for this project was destined for the island of Ons in Pontevedra in northwest Spain. This protected natural reserve has no power supply from the mainland, hence a reliable energy source was required for continued power to the islands infrastructure. In this case the islands camping area currently contains a solar panel installation, which provide energy during the periods when there is light. At certain times such as at night time or when there is a high energy demand the solar installation cannot manage the energy requirements. The installation of a genset would guarantee power for energy demand peaks and periods when solar light is unavailable, generating all the required energy.
COGENERATION PROJECT DESCRIPTION A 60-66 Kvas diesel generator in a 2900mm long enclosure was decided upon, with a silencer attached to the exhaust system giving a noise attenuation of 40db, as well as noise deflectors for increased soundproofing. One of the main reasons for soundproofing is because the installed genset and components are within the confines of the camping site, and a low sound level is required, particularly throughout the night. Additionally, project planning included the installation of a heat exchanger for the water jacket which uses the heat generated by the genset when in use to heat the sanitary hot water for use by the campers. Furthermore, a heat exchanger was designed for the exhaust gases to carry out the same function of heating SHW, working in parallel with the water jacket heat exchanger for maximum energy efficiency.
Both heat exchangers were fitted to operate automatically using electro mechanic valves which control which parts of the heating circuit enter in to operation depending on the working temperatures of the genset. In a working scenario, this means that from a standing start the genset will warm up in a normal fashion using its inbuilt radiator, but during this phase water heating only occurs via the exhaust gases heat exchanger until the genset has reached the normal working temperature. Once the genset has reached its nominal working temperature, the water jacket heat exchanger valves become operational using the thermal excess generated by the genset engine for heating water. Should the water temperature exceed a fixed temperature, the valves will act to switch the engines cooling system via the radiator until the water temperature has been correctly adjusted.
COGENERATION PROJECT AIMS
PROJECT DEVELOPMENT
Maximum energy efficiency from the genset to obtain the process of cogeneration: electricity and water, and to extract the maximum amount of energy both electrical and thermal from the genset in an installation in the open sea completely isolated from a mains grid power supply.
Modifications to the gensets water pipes were necessary at specific points to ensure sufficient water for water jacket heat exchanger. Further modifications were also necessary to connect the exhaust fumes heat exchanger to the exhaust pipes. Piping is fully lagged to reduce heat loss to a minimum and obtain the highest possible temperature in exhaust pipe.
SOLUTION Heat retention of 67kw thermal was harnessed, in addition to the electrical 66 Kvas supplied by the genset, therefore successfully obtaining double the performance of a standard thermal engine. To supply SHW, the water inlet temperature is 20 ยบC, with the water output being 80 ยบC a at a regulated pressure level of 2 bar.
COGENERATION TECHNICAL SPECIFICATIONS 60-66KVAS 230V Single Phase 1500 rpm Exhaust pipe sound proofing -40dB Detachable side panels Prepared for a marine environment (enclosure painted to C5M standard, and protective treatment for alternator windings) High efficiency heat exchange plate with automatic temperature control Exhaust gases heat exchanger with automatic temperature control