Air to water heat pump > Real case life

AIR TO WATER HEAT PUMP

REAL CONSUMPTION OF THERMIRA AIR TO WATER HEAT PUMP

Thermira air to water heat pump installed in Las Tablas, Madrid.

Thermira is an air to water heat pump system that is basically characterized by the energy savings it provides for users, maintaining the required levels of comfort and temperature. Below is the data obtained for an installation and the owner’s annual consumption in heating over the year 2016.

1. HOUSING INFORMATION

  • A top-floor apartment located in the neighbourhood of Las Tablas, Madrid.
  • The apartment covers a floor area of 85 m² and is 2.5 m high.
  • Average insulation.

2. INSTALLATION INFORMATION

  • Conventional hydraulic radiator system.
  • 10 kW single-phase Thermira installation.
  • Model: THG-10BME and THG10BMI (outside and inside units).
  • Installation only for central heating.
  • DHW provides with storage water heater.

3. ELECTRICITY TARIFF

  • The owner has the PVPC 2.0 DHA electricity tariff. This is the regulated Small Consumer Voluntary Price with Time Restriction for installations of under 10 kW.
  • The power contracted is 6.9 kW.

4. MEASURING ELECTRICITY CONSUMPTION

  • In order to measure consumption an EFERGY E-2 CLASSIC counter was used.
  • The owner programmed a maximum consumption of 50 kWh per day on the counter, which sets off a warning system if the daily consumption is exceeded. It is shown in green in the lower left corner in the graph on the next page.

5. FUNCTIONING AND USE OF THERMIRA HEAT PUMP

  • Thermira was programmed to heat the water system to an outlet water temperature of 55°C.
  • The owners set up a temperature of 21°C both at day and at night.
  • On various occasions they put the temperature up to 23°C, especially in the evening until they go to bed, when they put it back to 21°C.

Consumption data recorded in December 2016

TEMPERATURES RECORDED IN DECEMBER 2016
  • Lowest temperature recorded -5.2°C.
  • Highest temperature recorded 14.5°C.
  • Average monthly temperature 7.1°C.

Summary of consumption in 2016

ANNUAL CONSUMPTION DATA THERMIRA AIR TO WATER HEAT PUMP

* Annual cost for 2016 based on kWh consumed in heating by Thermira heat pump system. Other concepts on the invoice such as the power contracted and tax have not been included.

CONSUMPTION SUMMARY 2016

Data sources

Outside temperature data was taken from meteorological station 82210 (LEMD) and uploaded into  http://www.tutiempo.net/clima/Madrid_Barajas/02-2014/82210.htm

Data about the average price per kW/h applied in peak and off-peak hours was taken from the average monthly data published by the Red Eléctrica de España. The prices applied in both periods have time restrictions. The average annual price was € 0.126 / kWh at Peak for 10 hours and € 0.052 / kWh at Off-Peak for 14 hours.

Comments

This result is an average estimate taking into account the real reading of kWh consumed by the air to water heat pump.

The particular way that this client uses his central heating should also be taken into account. The days when consumption falls drastically are days when the user was not at home and left the heat pump system working at a temperature of 20ºC.