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CRP–05-P - Flow and energy computer for steam

Application

The flow and energy computer for steam CRP – 05 – P is dedicated for measurement systems installed in heat distribution networks and in technological installations where steam is the medium. CRP – 05 – P can work as an autonomous measurement system or can be included into greater monitoring system with data multi-access.


CRP-05-P
CRP - 05 - P

This device was constructed not only as the standard measurement and registering unit but also to enable precise control of every thermodynamical parameter of a steam stream installation. It is designed to calculate:

  • dry steam’s parameters based on its temperature and pressure measurements
  • saturated steam’s parameters based on its temperature measurements
  • steam’s mass flow and emitted heat power based on temperature and pressure measurements and pressure difference in gorget (snout) or measures of volume flow
  • daily and monthly calculated balances of flowing steam’s mass and heat
  • average hour values of steam’s mass flow and emitted heat
  • maximal (in month) average hour values of steam’s mass flow and emitted heat
  • excess balances of ordered power

Measurements’ and calculations’ precision

CRP - 05 - P realizes analog measurements using 24-bits A/C converter of the sigma-delta type. Software provides calibration of current and resistant measurement inputs according to the temperature. This enables proper performance of the unit in a wide range of temperatures. Software adjusts A/C converters during operation and eliminates an offset.

Besides the measurement precision itself, an advantage of CRP - 05 is that instead of look-up table the special thermodynamic computer is used, which calculates on-line every necessary parameters of the medium. The device automatically adapts methods of calculation to the medium’s state (dry steam, saturated steam or water), so the user need not to know precisely range of parameters while ordering the unit.


Data access

An internal data base is created in CRP – 05 flash memory, where every calculated values (balances, average and current values and summators) with its time markers are stored. An access to this base as well as to current computer reading is possible from device’s desktop or on-line, using digital interface.

User can access the following information:

  • steam’s temperature
  • condensate’s temperature
  • absolute steam’s pressure
  • steam’s volume flow or pressures difference
  • condensate’s volume flow or pressures difference
  • stream of steam mass
  • emitted stream of heat (difference between inlet and outlet streams)
  • stream of condensate’s mass
  • stream of condensate’s heat
  • specific volume
  • enthalpy
  • stickiness
  • isentropic expression
  • Reynolds’s number
  • pipeline’s and gorget’s diameter in actual temperature
  • correction for round of gorget’s edge
  • correction for roughness of pipeline
  • mass summators
  • energy summators

Communication

CRP - 05 - P is equipped with serial interface RS 232 or RS 485 (MODBUS RTU) which enables transmission of data to the supervision system.

There are number of methods of connecting CRP – 05 to the supervision system. HYDRO-ECO-INVEST offers some products which are useful to design of the heat energy monitoring systems, for example: