What is the different between a direct and indirect meter
DIRECT HEAT METERING
The direct metering is the most accurate and reliable system for measuring the amount of energy used by individual households for heating their homes. The solution is applicable only in heat systems with horizontal distribution pipes network or areas in which the heat transfer fluid is distributed to individual apartments or to industrial plants, by district heating or by an individual central unit servicing more buildings. The system is composed by a thermal energy meter, a motorized valve controlled by a programmable thermostat located inside the apartment, in this way the user can adjust the temperature of the household and determine the hours of heating being able to manage the system according to his specific needs. .
INDIRECT HEAT METERING
The indirect metering is applied to the plants where the distribution of the heat transfer fluid is achieved through risers, which means that the pipes of fluid flowing through the radiators of the single apartments have more points adrift from the main system (risers) that feed the individual radiators, making it difficult to measure the flow rate of fluid that enters the apartment. For simplicity we use the example of a riser which feeds the radiator of a room and at the same time also the counterpart room located on the upper floor. In this case, the use of individual devices, defined as heat cost allocators, installed on each radiator within individual apartments allows to avoid the unfair solution for which heating costs are allocated in accordance with the size of the apartment. Based on the operating parameters of the radiator itself it is calculated, in an indirect way, the amount of heat that the radiator releases into the environment. The sum of the readings of all the radiators provides the total consumption of the apartment and, with all apartments equipped with devices set with homogeneous parameters, you can proceed with the allocation by individual apartment of the centralized system total heating costs.
Aug 24, 2013 |
Professional Metering System