Method for operating a heat pump system, heat pump system and hvac system

Abstract

The invention relates to a method for operating a heat pump system, a heat pump system and an HVAC system measuring a solar irradiance, wherein the operation of the heat pump is adjusted based on the solar irradiance.

1 . Method for operating a heat pump system, comprising
 measuring a solar irradiance incident onto a building, and   adjusting an operation of a heat pump included in the heat pump system based on the measured solar irradiance.   
     
     
         2 . Method according to  claim 1 ,
 wherein the operation of the heat pump is adjusted only when the solar irradiation is larger than a predetermined threshold.   
     
     
         3 . Method according to  claim 1 , wherein the operation of the heat pump is adjusted using feed forward control and/or feedback control, the method further comprising
 using the measured solar irradiation to adjust, preferably to reduce, at least one of the following quantities entering the feed forward control and/or the feedback control by a temperature correction amount: a target flow temperature of the heat pump, a flow temperature set-point and/or an air temperature set point of an indoor air temperature.   
     
     
         4 . Method according to  claim 3 ,
 wherein in the adjusting of the operation of the at least one heat pump the temperature correction amount is determined from the measured solar irradiation using a solar heat gain coefficient, SHGC, method, a Overall Solar Aperture Coefficient Method and/or a Standard Assessment Procedure, SAP.   
     
     
         5 . Method according to  claim 1 ,
 wherein the operating frequency of a compressor included in the heat pump is adjusted to adjust the operation of the heat pump.   
     
     
         6 . Method according to  claim 1 , wherein the operation of the heat pump is adjusted using feed forward control and/or feedback control,
 wherein the method further comprises   comparing the measured solar irradiance ϕ to a threshold irradiance,   if the measured solar irradiance ϕ is equal or larger than the threshold irradiance then   determining a solar gain as Q solar =αϕ, wherein α is a solar aperture coefficient,   determining a flow temperature reduction as ΔT=Q solar /(m C p ), wherein m is a mass flow rate of a heat transfer fluid of the heat pump system and C p  is a specific heat capacity of the heat transfer medium of the heat pump system and   adjusting the operation of the heat pump by reducing a target flow temperature T flow,supply  of the heat pump by ΔT.   
     
     
         7 . Method according to  claim 1 , wherein the operation of the heat pump is adjusted using feed forward control and/or feedback control,
 wherein the method further comprises   comparing the measured solar irradiance ϕ to a threshold irradiance,   if the measured solar irradiance ϕ is equal or larger than the threshold irradiance then   determining a solar gain as Q solar =αϕ, wherein α is a solar aperture coefficient,   determining an air temperature reduction as ΔT=Q solar /M, wherein M is a thermal mass of the building and   adjusting the operation of the heat pump by reducing the indoor temperature set point T indoor sp  by ΔT.   
     
     
         8 . Method according to  claim 1 , wherein the solar irradiation is measured by a sensor located on the outside of the building, preferably at a highest point of the building or at a spot of the building having unobstructed view of the sun during the whole day. 
     
     
         9 . Method according to  claim 1 , wherein the steps of the method are carried out at least once every hour, preferably at least once every 15 minutes, preferably at least once every minute. 
     
     
         10 . Heat pump system, comprising
 at least one heat pump,   at least one sensor configured for measuring a solar irradiance onto a building,   a controller configured for controlling an operation of the at least one heat pump based on an amount of solar irradiance measured by the at least one solar irradiance sensor for measuring a solar irradiance.   
     
     
         11 . Heat pump system according to  claim 10 ,
 wherein the controller is configured to adjust an operating frequency of a compressor included in the at least one heat pump as the operation of the at least one heat pump based on the solar irradiation.   
     
     
         12 . Heat pump system according to  claim 10 , wherein the solar irradiance sensor is a silicon photo cell or a thermopile type sensor. 
     
     
         13 . Heat pump system according to  claim 10  wherein the heat pump is configured to carry out a method according to  claim 1 . 
     
     
         14 . HVAC system including a heat pump system according to  claim 10 .