Hotels the ideal candidates for cogeneration
The first to use CHP plants were the Riviera’s biggest luxury hotels: Kaya Palazzo, Cornelia Diamond and Maxx Royal. Since mid-2013, these have all been using fuel-efficient cogeneration plants to simultaneously produce electrical power and heat for their hotel operations. There are currently ten mtu CHP plants in total, of which eight are already operating, and an additional two plants scheduled to be delivered. The company already has experience of building power generation systems for hotels in Turkey — mtu plants have been in service at the Bursa Hilton and Bursa Hilton Hampton in the north-west of the country for several years now.
“Hotels are the ideal candidate for on-site power generation using the CHP principle,” explained Ali Güzel, Sales & Marketing Director, mtu Turkey. “Their power requirement remains constant throughout the year and they use the heat and power they generate directly on the hotel site, without any distribution losses. That means that they almost completely utilize their primary energy source, which protects the environment and their wallet at the same time.” That is an important criterion for Belek’s hotel owners, who have committed themselves to responsible use of local natural resources.
Optimum use of heat for high overall efficiency
mtu devised effective solutions for adapting the plants to the actual power requirements of the luxury hotels they are serving. Each hotel covers several hundred thousand square meters of space, with hundreds of rooms, heated swimming pools and spa areas, and diverse shopping facilities and entertainments. The power needed for smooth running is delivered by natural-gas CHP systems from mtu based on enhanced-power Series 4000 gas engines. Connected to a generator, and depending on the engine model, they deliver up to 2,145 kilowatts for electrical consumers in the hotel. A heat module is also deployed to extract heat from the exhaust gas, engine coolant (up to 90°C) and aftercooler (up to 45°C). That heat is then harnessed for other uses, such as generating steam for cleaning the hotels’ laundry.
With maximum use of the heat extraction potential, the plant achieves an overall level of efficiency that is exemplary at almost 90%. “By generating our own heat and power, we save energy costs and do not have to rely on the public grid,” explained Sinan Keleş, Technical Director, Maxx Royal Hotel. “For our guests, that translates into the best possible comfort — nothing stands in the way of their relaxation if everything is functioning as it should.”
An important reason for deciding in favor of mtu systems was direct local customer service. mtu has its own team in Antalya that is on hand to take care of customers in Turkey, and, in this case, the hotel owners of the Turkish Riviera, when spare parts, repairs or other services are needed. “If system problems crop up, we have direct access to the manufacturer, without middlemen,” says Ali Akkuş, Technical Director, Kaya Palazzo Belek Hotel. “Even if the worst comes to the worst, we can still keep downtimes to a minimum, leaving our guests free to enjoy their holiday undisturbed.”
Additional benefits of combined heat, cooling and power
At the Cornelia Diamond and Kaya Palazzo hotels, the heat modules are additionally equipped with single or two-stage absorption refrigeration systems which use waste heat from the CHP plant to generate cooling energy. During the busy summer season, that cooling energy is used for the hotel air-conditioning. In the winter, when temperatures do not exceed 25 degrees and additional cooling is not required, the absorption refrigeration systems are taken off line and the heat discharge used to warm up, for example, indoor swimming pools and saunas. Connection of the absorption refrigeration system in summer makes for optimum heat consumption and enhances the efficiency of the plant as a whole.
Together with heating costs, which are lower compared to the cost of electricity, significant competitive advantages are created. Kenan Saltabaş, Technical Director, Cornelia Diamond Hotel: “We use our mtu systems to exploit the energy-saving potential available to us in the best possible way, and all year round.”