Electric Hot Water System Shopping Point,

Where a system with a variable air flow rate is used for the purpose of cooling, the maximum air flow rate is determined according to the cooling need. The other necessary input parameters are taken from the building design documentation. Where the test reference year is used for calculating the cooling load, it should be borne in mind that the results are not applicable to the cooling load in the case of a warmer than average summer. This regulation is made in accordance with subsection 7 3 of section 3 of the Building Act. Indoor climate 1 The energy calculation uses the indoor temperature set-points and ventilation air flow rates set out in the regulation entitled Minimum Requirements for Energy Performance enacted in accordance with subsection 7 2 of section 3 of the Building Act. Depending on the temperatures of cold mains and hot water, you will sometimes need a greater volume of hot water to be mixed with cold water in order to achieve the desired shower temperature.

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This regulation is made in accordance with subsection 7 3 of section 3 of the Building Act. Scope of application of the Regulation This regulation establishes the methods for calculating the energy performance of buildings to prove their compliance with the minimum requirements for energy performance.

The area of the envelope is calculated on the basis of the internal dimensions of the building. The specific heat loss is the sum of the heat losses that result from conduction and infiltration through the building envelope; 17 energy need — the electrical and thermal energy without taking into account system losses and conversions from one energy type to another required for indoor climate control, the heating of household water, lighting, and the operation of equipment.

Energy use is calculated on the basis of energy need, taking into account system losses and energy conversion losses. At the end-point of a technical system of the building usually the connection point to the corresponding energy networkthe energy use of the utility system equals the sum of delivered energy and local renewable energy; 24 system boundary of delivered and exported energy — the system boundary which is used in energy calculation and which determines the relations between the energy flows to be included in the calculation Figure 1.

Figure 1.

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System boundary of delivered and exported energy. The other necessary input parameters are taken from the building design documentation.

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Small residential buildings and buildings with a single purpose of use may be regarded as a single zone for the purposes of the energy calculation. Large buildings are to be divided into as many zones as required according to their purposes and periods of use.

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The test reference year represents the typical outdoor climate of three decades — and therefore is not suited to be used for the calculation of the heating power need. Where the test reference year Electric Hot Water System Shopping Point used for calculating the cooling load, it should be borne in mind that the results are not applicable to the cooling load in the case of a warmer than average summer.

Indoor climate 1 The energy calculation uses the indoor temperature set-points and ventilation air flow rates set out in the regulation entitled Minimum Requirements for Energy Performance enacted in accordance with subsection 7 2 of section 3 of the Building Act. In the case of a dynamic calculation, the relevant values are used as the heating and cooling set-points of a thermostat.

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Where the building lacks a cooling system, the difference between the summertime indoor temperatures and the cooling set-point must be calculated. Where a system with a variable air flow rate is used for the purpose of cooling, the maximum air flow rate is determined according to the cooling need.

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The minimum air flow rate and the ventilation control function must, in general, be selected such as to avoid exceeding the ppm maximum volume fraction of CO 2 while the corresponding value in outdoor air is ppm. Table 1.

Contact Us How does it work To obtain correct shower water temperature, hot and cold water are combined at the shower mixer tap. Both have different origins: hot water comes from a heating device, for example from your electric or gas water heater, and cold water comes directly from the mains.