Heating, HVAC and heat sources
Function blocks in the group “Heating, HVAC and heat sources”. Each link opens the block page; sorted by library and name.
| Block | Page title | Library | What it is for |
|---|---|---|---|
| t14_bit_rotation | Bit rotation | HVAC | Bit rotation shifts and rotates bits in a vector, based on rising or falling edges on the inputs. |
| t1_equithermalcurve | Heating curve | HVAC | A heating curve calculates heating water setpoint based on the outside temperature: the lower the outside temperature, the higher the heating water setpoint. |
| t28_dew_point | Dew point calculation | HVAC | The function calculates dew point temperature of humid air at standard pressure of 101 325 Pa, based on air temperature and relative humidity. |
| t29_enthalpy | Enthalpy | HVAC | The function calculates enthalpy, or energy of humid air, partial water vapour pressure, and absolute humidity from air pressure, temperature and humidity. |
| t2_three_point_control | Three-point control | HVAC | The block converts a 0…100 % signal to opening and closing pulses to control a three-point peripherial, such as a valve or damper actuator. |
| t32_operating_hours | Operating hours counter | HVAC | The block measures total activity time of a binary input, or cumulated operating time of the connected aggregate (pump, fan, boiler). |
| t33_min_max_controller | Minimum and maximum controller | HVAC | The block monitors the measured value and announces exceeding of alarm limits. |
| t34_e_max | Load shedding (E-Max) | HVAC | The block controls (shuts off) up to 8 groups of aggregates to keep the energy consumed in a 15 minutes interval below a given limit. |
| t35_pump_switch | Pump switch | HVAC | The block switches pumps or other aggregates on a periodical basis, and automatic changeover if one pump fails. |
| t36_power_meter | Power meter | HVAC | The block calculates instantaneous power (or any other value, like flow etc.) from a cumulated value which is brought to the input (energy, water volume). |
| t37_average_power_meter | Average power meter | HVAC | Calculation of derivation of input signal. |
| t39_recuperation | Heat / Cool recovery | HVAC | The block is a decision and control element for heat (or cool) recovery strategy at an air handling unit with mixing dampers or heat recovery plate / wheel. |
| t40_solarcalculator | Solar calculator - Astronomical clock | HVAC | The function calculates the position of the Sun for given geographical coordinates and time. |
| t6_three_point_control_feedback | Three-point control with feedback | HVAC | The block converts a 0…100 % signal to opening and closing pulses to control a three-point peripherial, such as a valve or damper actuator. |
| t8_three_point_controller | Three-point P controller | HVAC | The block is a P-controller with a three-point output. |
| CascadeController | Cascade Controller (v1.2) | Lib.Mervis Libraries | Block used for controlling devices connected in a cascade, it is an extension of the previous version. |
| CascadeControllerSwitcher | Cascade Controller Switcher (v1.1) | Lib.Mervis Libraries | Auxiliary block used to enable the use of a combination of one modulated source and several non-regulatable sources with a cascade controller. |
| EquithermalCurve | Equithermal Curve (v1.0) | Lib.Mervis Libraries | Block for calculating the heating medium temperature according to the equithermal curve. |
| EquithermalCurve4Point | Equithermal Curve - Using Four Points | Lib.Mervis Libraries | A block for calculating the heating medium temperature according to an equithermal curve defined by four points. |
| ModulatedBoiler | Modulated Boiler (v1.5) | Lib.Mervis Libraries | Block used for controlling the performance of a boiler with a modulated burner and a circulation pump. |
| ModulatedSource | Modulated Source (v2.0) | Lib.Mervis Libraries | Block used for controlling the performance of a source (primarily a boiler with a modulated burner and a circulation pump). |
| ModulatedStage | Modulated Stage (v1.0) | Lib.Mervis Libraries | Block used for controlling the performance of a general modulated source. |
| OneStageBoiler | One-stage Boiler (v1.1) | Lib.Mervis Libraries | Block used for controlling the performance of a boiler with a single-stage burner and a circulation pump. |
| OutsideTemperature | Outside Temperature (v1.2) | Lib.Mervis Libraries | Block used for processing outside temperature, calculating average daily temperatures, and blocking heating. |
| ReturnTempController | Return Temperature Controller for Boiler Blocks (v2.0) | Lib.Mervis Libraries | Auxiliary block for boilers used for controlling the return water temperature. |
| TwinPump | Twin Pump Control (v1.4) | Lib.Mervis Libraries | A block used for controlling twin pumps. |
| TwoStageBoiler | Two-stage Boiler (v1.4) | Lib.Mervis Libraries | Block used for controlling the performance of a boiler with a two-stage burner and a circulation pump. |
| TwoStageBoilerWithReturnTemp | Two-stage Boiler with Return Temperature Controller (v1.3) | Lib.Mervis Libraries | Block used for controlling the performance of a boiler with a two-stage burner and a circulation pump, where monitoring of the boiler return temperature is necessary. |
| TwoStageSource | Two-stage Source (v2.0) | Lib.Mervis Libraries | Block used for controlling the performance of a source (primarily a boiler with a modulated burner and a circulation pump). |