Tag Archive for: energy audit

Guidelines to save energy this Christmas

During Christmas holidays, one of the most energy-consuming elements, for everyone, is the lighting of the house.

It is usual to use bright ornaments at home, which often use halogen technology, high drain. The best option is to progressively replacing it by LED technology, which preferably incorporates solar collector to run, so we are eliminating electricity consumption completely. The same happens in residential buildings with landscaped communal areas. However, in apartments we can only use LED decorative lights to save energy.

On the other hand, the most energy-consuming element during the cold months inside a home rarely focuses on lighting. Put the focus on the elements designed to heat the house, water heating, etc. such as air conditioning, the heat, central heating, etc. In that sense, it is advisable to regulate temperatures as the highest consumption occurs when there are large jumps and systems have to work twice as hard to reach the desired temperature at a given time.

  • Set the temperature between 17 and 18 degrees although we are not inside the house.
  • Set the temperature between 21 and 22 degrees when we are inside the house.
  • Set the temperature of the heater thermostat to 50 degrees in air conditioning
  • Close grids of rooms which don’t need to be heated
  • Each degree reduces consumption by 5-8%
  • With programmable thermostats to save heat, you do not need the entire volume of hot water 24h.
  • Take into account the simultaneity of consumption to avoid peak.

Save on the wrong side is to spend more for the same

In a previous post, we talked about the cost overruns in which we could incur trying to lower the price hiring our energy with a trading company. In this post, we would like to focus on raising consumer’s awareness about the importance to make the right decision when he renews, extends or replaces any system or subsystem or any element which contributes to the consumption of an installation.

SMEs struggle every day against all types of external and internal problems, subsisting in increasingly competitive and aggressive environments, where often the only element of concise comparison is the price. As energy costs have increased exponentially in recent years and is expected to continue to do so despite the steady trend of recent months, it has become one more element to consider. It is necessary that purchasing decisions take into account efficiency criteria when implementing corrective measures as well to obey technical needs, as extensions motivated by an expected production growth. If the businessman only wants to give priority to the “cost” of different offers during the purchase process over the energy consumption of those once implemented he will be mistaken, considering that when turning on the switch of what he has installed, he will have to pay the kWh consumption arising. Neither the installer responsible for the execution, nor the engineer who has designed the project, nor the manufacturer of the equipment that has sold him, will pay for him the increase in the invoice. Everyone has a different role and selection criteria should note that the above is met, but none of them will hold what we consume or pay afterwards per unit of production since only an adviser with engineering and technical advice capabilities can do this.

Applying efficiency criteria in any purchasing decision we will obtain clear advantages:

  • Ensure the return on investment by reducing consumption in the case of renovations or improvement of facilities.
  • We will have a clear forecast of energy consumption that allows us to compare between different alternatives.
  • We will reduce maintenance costs since usually selected equipment based on efficiency criteria includes the entire set of items to install: equipment, design, control elements, etc. Increasing energy efficiency means increasing productivity.
  • For every € invested we will recover a part in every kWh consumed. Therefore it is essential to apply efficiency criteria in investment over one year.

Energy efficiency is not a theoretical concept as many believe, it starts from the time when we have to undertake daily costs to upgrade facilities that use are deteriorating. The sooner we understand it, the sooner we will save energy.

Buy at a fixed price or indexed

Recently the electrical trading companies are betting on offer an indexed price, as there is a growing demand for this type of offer. It is not surprising since traditionally indexed price has always been a way to hire the most economical electrical energy.

Why is that?

To understand we can make a comparison with the banking sector. The fixed rate offered by a bank when hiring a mortgage includes detours costs and the risk of fluctuations involving loss to who sells. Indeed, a fixed price is a risk for whom provides it, such risk, let’s call it warranty, is included in the price we finally pay as an additional cost, as well for the fixed interest in the banking sector or the rate of fixed prices in the energy sector. When buying indexed price, we assume that risk. Therefore it is conceivable that it will be cheaper in the medium term. Given that contracts are signed for one year, the risk is negligible.

There is no free lunch

However, the indexed price is interesting whenever we do not charge commission high costs, also called operating costs or fee. The reasonable cost for SMEs is between 3 and 4 € / MWh hired (estimated consumption from consumer or trading company reading). Naturally this is always subject to consumption. Usually, the greater the consumption, the better trading offer.

We don’t need to understand the energy market. Let’s search a good adviser to tell us and ensure that we are paying the right price and, specially that we are optimised over our competitors.

Energy efficiency sernoven-eficiencia-energetica-centros-deportivos-2 Energy efficiency

Sernoven, cornerstone for sports centers energy efficiency

As a result of the experience accumulated on energy efficiency over 5 years, Sernoven has achieved the following excellent results in sports centers energy optimization:

  • Continuous improvement in the performance of Technical and Energy Consulting Service provided for Sports Centers; energy monitoring, changing usage habits, technical management of facilities optimization, maintenance facilities providing optimization, technical adequacy of obsolete or poorly maintained facilities, etc.
  • Through detailed analysis of telemetry data provided by each of the main equipment responsible of the sports facilities consumption, we have achieved to prioritize, according to the guideline customer, measures with less impact on investment and lower amount of savings over those of greater impact on investment and greater amount or vice versa. We reduce up to 40% in electricity bills and as much in thermal bills (gas, oil, etc.) by consulting detail, without necessarily having to take major investments or changes. It should be remembered that funding is provided against cost savings, however small may be the investment.
  • To acquire a deep understanding of the financing models that fit the reality of the sector that has made possible the implementation of energy efficiency measures that require a major investment.
  • Continually increase CUSTOMERS portfolio in this Sector.



Some important milestones:

  1. Air/water cooler replacement project with a hight efficiency cooler with heat recovery for preheating the ACS (hot water for sanitary uses) and semi-Olympic pool water. ESEER> 5 (cooling and thermal energy)

Investment = 241,000 €

Savings = 50,000 € / year

PRS = 4,8 years

  1. ACS production system replacement project of electrical resistance by high efficiency heat pumps (COP> 4)

Investment = 105,000 €

Savings = 24,000 € / year

PRS = 4.3 years

  1. Implementation of remote monitoring system (TELEMETRY) of electrical energy and natural gas consumption for trading variables and consumption habits optimization.
  2. Adequacy of variables instructions and facilities operation (ACS accumulation temperature, flow pumps, pools seasonal temperature, etc.) to optimize consumption.

Investment = 0€

Savings = 15,000 € / year

From SERNOVEN we offer all our knowledge and experience to improve the management of their facilities, to reduce energy costs and improve service quality to its users.