Tags Posts tagged with "DHW"


The 4-star Vincci The Mint hotel offers its guests an innovative concept from the moment they step through the doors into the reception area: from a check-in experience at the bar of its gastro pub, to its façade of great artistic value where the traditional architecture that dominates the exterior of the building contrasts with the originality of its interior design. Alternative, fresh, original, fun and full of unique spaces, Vincci The Mint offers a different style of accommodation in Madrid: a hotel in the city’s avantgarde Gran Vía with design by Jaime Beriestain. For the efficient production of domestic hot water (DHW), units from Japan’s Mitsubishi Heavy Industries were chosen, supplied by Lumelco.

The new hotel establishment embodies the latest commitment by the Vincci Hotels chain to restore historic buildings. The building was constructed between 1916 and 1919 and its f açade is of high artistic value, in which the traditional architecture that dominates the outside contrasts with the originality of its interior design. Property owner, Generali Group, has undertaken its renovation with an investment of approximately €5m.

Interior designer Jaime Beriestain was entrusted with the task of giving personality to the new establishment, respecting the spirit of the building while incorporating his particular style. Its surprising originality is evident when you walk through the door, with its mint green and turquoise hues forming the basis for the décor. Read more…

Article published in: FuturENERGY March 2018

The buildings in which Europeans sleep, eat, shop, learn and work, house a great opportunity for energy saving and emissions reduction, particularly in the so-called technical systems: heating, DHW, cooling, ventilation and lighting. A recent study by energy consultancy Ecofys, sponsored by Danfoss, shows the energy saving that can be achieved by improving energy management in Europe’s buildings. This hitherto under-exploited potential is calculated to save €67bn on the annual energy bill of European citizens by 2030, while reducing CO2 emissions by 156 Mt. Documents have been published as part of the study that focus on different types of buildings. This article sets out the main conclusions of the study in the case of supermarkets, along with some of the more recent success stories from Danfoss in this sector on the Iberian Peninsula.

Buildings allocated to supermarkets in Europe occupy an approximate surface area of 115 million square metres. Part of the study included an assessment of the energy saving potential of a sample supermarket with a surface area of 1,025 m2 and a total energy consumption of 181 kWh/m2a. This sample building is equipped with a gas condensing boiler for heating (with energy recovery for the refrigeration system); mechanical ventilation systems with no heat recovery; a refrigeration and air conditioning system by means of compression chillers; and a direct and indirect lighting system via fluorescent tubes.


Improvements to the technical systems in this sample supermarket reveal the possibility of achieving a 45% saving in energy, which translates into just over 8,000 €/year, with an investment of some €36,000 that would be amortised in around 4.5 years. Read more…

Article published in: FuturENERGY July-August 2017

The four-star hotel Las Casas de El Arenal, situated in a refurbished 19th century building, is less than 10 minutes from the doors of Seville Cathedral and the Giralda tower. Decorated with close attention to detail, it has preserved the building’s high original ceilings. This hotel has recently been refurbished with the participation of CM4 Arquitectos as project managers, with Otaisa appointed as works supervisor. For the temperature control and domestic hot water production, units from Japanese brand Mitsubishi Heavy Industries were selected.

This project set out to give a new use to two 18th century Seville courtyard houses by refurbishing their structure and installations while respecting their inherent characteristics: the façades, patios and galleries as well as the relationship between floors and the original facing. The result is a hotel that has been effortlessly housed within a historic building, with no need to introduce elements that alter the original architecture.


The hotel Las Casas de El Arenal has 27 bedrooms distributed over three floors, fitted into the original spaces provided the dimensions and stability of the building so permitted. The bedrooms have coffered wood ceilings made using traditional timber framing methods. Restoration work was also carried out on the stairs, which feature Italian marble steps and elegant wrought iron and wood banisters. Read more…

Article published in: FuturENERGY June 2017

In any type of installation, and especially those destined for the hotel sector, the reduction in the space utilised to install heating and DHW units is a variable that could be a significant factor, particularly in refurbished installations. Focusing on installations for the hotel sector, any space that can be reduced for the installation of the boiler room could be allocated to other uses that enable new business lines and sources of revenue (parking spaces, roof terraces, etc….). Traditionally, the DHW installation has been characterised by requiring a large space for positioning its associated units, in particular, the accumulation tanks.

It is well known that one of the main energy demands in a hotel-type installation is the need to cover the domestic hot water (DHW) service expected by the clients of such establishments. This service is moreover a priority, as its lack of availability could impair the image of the hotel as well as result in a possible loss of clients.


To avoid this, hotels have historically resorted to the design of installations with large tanks of storage water, in order to have a volume of water readily available that is able to cover consumption peaks as they occur. This design criteria is sufficient to guarantee the right level of comfort and customer service, but can raise questions today in terms of energy saving and the space necessary for its installation. Read more…

Gaspar Martín
ACV, Technical Director

Article published in: FuturENERGY June 2017

In July 2014, the Madrid Health Service announced a public tender for a Mixed-Purpose Contract for Supplies and Works to construct and manage a natural gas-fired thermal plant at the Hospital Universitario La Paz. The 15-year contract had a tender budget of almost €45m (ex. VAT) to supply power to cover the hospital complex’s energy demand for heating, DHW and steam. Four proposals were submitted, with the contract finally being awarded to the joint venture comprising Gas Natural Servicios SDG and Veolia Servicios Lecam.

The Hospital Universitario La Paz is one of the largest hospitals in terms of importance in the Autonomous Community of Madrid and an essential part of the public healthcare system. Consisting of four buildings that house the General Hospital, Maternity Hospital, Children’s Hospital and Trauma Centre, the complex covers a surface area of 180,000 m2 and has a total of 1,328 beds.


Due to age (some 50 years) and the degree of wear and tear of its thermal installations, the Hospital Universitario La Paz was facing high energy and O&M costs in addition to: the risk of a lack of supply, with the resultant risk to the health and wellbeing of patients and workers., high environmental impact, due to the use of diesel. and an inability to handle increases in demand. Read more…

Mario Bonaut Prieto, Ana María Zafra, Gas Natural Fenosa
Raúl González Alcorlo, Veolia

Article published in: FuturENERGY January-February 2017

Since 26 September 2015, the Ecodesign ErP Directive has been of compulsory application for EU Member States as regards the design of Energy-related Products (ErP) and as from its entry into force only those products manufactured according to the ErP requirements can be sold with the EC label. Although this directive affects over 1,000 product categories, for those relating to HVAC and DHW production, it covers boilers, heat pumps, accumulators, cogeneration systems, combined products systems, establishing their minimum efficiency levels, the maximum levels of NOX emissions, the minimum insulation for accumulators and the maximum level of acoustic emissions for heat pumps.

Heating and combi boilers that have had to comply with the ecodesign requirements since September 2015 include those with outputs of up to 400 kW, for which the standard has defined a minimum energy efficiency level to be complied with. This means that the new ErP Directive will prevent the sale of less efficient heating and combi boilers that do not meet the minimum performance requirements indicated in the Directive. In practice, this means that the market will tend towards condensing boilers which are almost the only type that can achieve the minimum requirements established by the ErP.

Another substantial change introduced by the Ecodesign Directive is that performance for the boilers that until now has been defined on the basis of the LCV (Low Calorific Value) will now be defined based on the HCV (High Calorific Value).. Read more…

Gaspar Martín
ACV, Technical Director

Article published in: FuturENERGY January-February 2016

The Hotel Albir Playa Hotel & Spa is a beachfront hotel with 202 rooms that in 2014 looked into the need to refurbish its DHW installation. The refurbishment enjoyed the support of Driwergy, an ESCO that undertook a preliminary study of the hotel’s needs and suggested changing the diesel boilers to air/water aerothermal heat pumps. The solution proposed by Driwergy involved the installation of the Q-ton system from Mitsubishi Heavy Industries, a CO2 heat pump for DHW at up to 900C and that produces DHW at between 70 and 750C.

Firstly, the energy needs of the hotel for DHW production were studied. This not only took into account the heating up of the water but also losses from both the piping ring joints and the accumulation tanks. Having carried out the analysis, it was estimated that the hotel consumes 15,000 litres/day every month of the year, except for July and August in which consumption rises to 20,000 litres/day.

This resulted in an hourly consumption profile as shown in Figure 1, calculating an annual energy demand of 464,744 kWh. To cover this demand, two Q-ton units were selected, working in parallel, with a total accumulation of 18,000 litres. Read more…

Article published in: FuturENERGY September 2015

0 1

It is highly significant how Spain’s energy model for generating and distributing heating and DHW to residential blocks over past decades, that represent the majority in Spain, has tended towards an individualised system of “one boiler for every home”. Its application has prevailed thanks to the convenience of the piped distribution of gaseous fossil fuels (despite its risks) and by a legislation that has been lax in controlling the squandering of energy and also, make no mistake, due to individualistic consumer behaviour as part of this necessary collective process. The clear winners of this model are neither energy efficiency nor the consumers.

The economic crisis that has exponentially increased the number of homes in “energy poverty”, the concern for be pollution in the cities and the commitment to the climate (that translates into less energy cost per capita to contaminate less and to reduce CO2 emissions), are elements that are making every group of citizens think again to modify the current energy model insofar as this is possible.

One possible way to resolve these issues is to promote district heating and cooling networks. This infrastructure is no more than a centralised heating and cooling system such as that of any association of property owners, but on a large scale, channelled through the streets to reach every home. Read more…

Juan Jesús Ramos
Technician, AVEBIOM Head of the ONCB, the Spanish National Observatory on Biomass Boilers

Article published in: FuturENERGY June 2015

Solar powered systems save energy, reduce the CO2 emissions of the building and lead to an economic saving that facilitates their amortisation, especially in hotel installations characterised by high and more or less constant levels of DHW consumption all year round. However to achieve this, these systems have to be well-designed, simple structures using reliable and efficient technologies and equipment that minimise necessary maintenance actions.

For example, for a 4-star hotel with an occupancy of around 100 people a day, a solar installation could be designed to cover 60% of the needs arising from DHW demand by installing a solar powered system with a working surface area of about 60 m2 and 4,000 litres of accumulation. The energy obtained through this clean and renewable system would represent a saving in fuel that, in the case of natural gas, would amount to almost 2,700 € per year and would avoid the emission of 17,254 kg of CO2 per year into the atmosphere. To achieve these savings values, the equipment and the type of system to be implemented have to be very carefully selected to protect the solar installation from its main risks: over-heating and freezing.

ACV has over 15 years experience in the manufacture of solar powered systems and is leader in the design, development and commercialisation of Drain Back technologies for tertiary-type installations. ACV’s Drain Back system empties heat-bearing fluid from the collector tank in the event there is a risk of over-heating or freezing, stopping the pump. Using gravity, the fluid is emptied into the drainage tank and air rises through the collector field. The unit is automatically refilled when the situation returns to normal (activating the pump, letting air fill the drainage tank so that the liquid goes back into the solar collectors). Read more…

Gaspar Martín
ACV, Technical Director

Article published in: FuturENERGY June 2015

The Hotel TRH Ciudad de Baeza has undertaken the remodelling of its fan-coil heating and DHW production system by installing high performance condensing boilers from the manufacturer Ygnis. The incorporation of these boilers has a very positive impact on the performance of the heating and DHW production units, as demonstrated by the consumption results obtained after two full seasons in operation. As illustrated below, the reduction in consumption brings with it a significant reduction in the hotel’s energy bill. The economic impact is such that in the space of 1.5 years, the installation investment has been paid for, taking the six-month heating period as the basis for calculating the amortisation.

The hotel had two 4,000-litre tanks for DHW, heated by four electric resistance units of 18 kW each with a total output of 72 kW. These tanks used to supply the fan-coils circuit for heating and the DHW circuit. The existing installation was located in a basement, with little available space and no flue gas outlet, thereby preventing the installation of any type of boiler irrespective of the fuel used, unless a completely new boiler room was built.

The possibility of choosing renewable sources was dismissed because the peculiarities of the TRH hotel, an ancient 16th Century Carmelite convent next-door to the Church of the Hospital de la Concepción. Its location in the historic centre of Baeza, a UNESCO World Heritage city, made any structural reform to the building completely unfeasible. The lack of flat roofs and terraces meant that it was impossible to use the rooftop for the installation of solar panels. Nor was the option of using biomass viable due to the lack of space required for its management. Read more…

Aina Servent Abadia
Product Manager, Ygnis

Article published in: FuturENERGY June 2015

SAJ Electric