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Energyplus: dual thermalstat doest work, system working towards lower temp. all the year round

Hi guys,

I got a hotel model (a FCU+PAU proposed model compared with LEED baseline) with dual thermalstat setpoint (22~24/25 generally) all the year round. Somehow the HVAC energy consumption is way higher than expectation. When I digging out the issue. It is found that some area are working towards the 22 degree C all the year round. For me it seems that the system overcools and then reheat but the setting are quite general that I have struggled for a while but just cannot find how to correct it. The Sensible Heat Gain Summary also shows something weird that 'HVAC Zone Eq & Other Sensible Air Cooling [kWh]' shows considerabily positive heat gain.

I have a attached the schedule setting and also sensinble heat gain summary. Can anybody help to have a look what is going wrong? many thanks!

Allison

Schedule:Compact,
Office Heating SP Sch,   !- Name
Temperature,             !- Schedule Type Limits Name
Through: 31 Dec,         !- Field 1
For: AllDays,            !- Field 2
Until: 06:00,            !- Field 3
-50,                     !- Field 4
Until: 07:00,            !- Field 5
14,                      !- Field 6
Until: 08:00,            !- Field 7
20,                      !- Field 8
Until: 19:00,            !- Field 9
22,                      !- Field 10
Until 20:00,             !- Field 11
20,                      !- Field 12
Until: 21:00,            !- Field 13
14,                      !- Field 14
Until: 24:00,            !- Field 15
-50;                     !- Field 16

Schedule:Compact,
Office Cooling SP Sch,   !- Name
Temperature,             !- Schedule Type Limits Name
Through: 31 Dec,         !- Field 1
For: AllDays,            !- Field 2
Until: 06:00,            !- Field 3
100,                     !- Field 4
Until: 07:00,            !- Field 5
26,                      !- Field 6
Until: 19:00,            !- Field 7
24,                      !- Field 8
Until: 24:00,            !- Field 9
100;                     !- Field 10

HVACTemplate:Thermostat,
Office_thermo,           !- Name
Office Heating SP Sch,   !- Heating Setpoint Schedule Name
,                        !- Constant Heating Setpoint {C}
Office Cooling SP Sch,   !- Cooling Setpoint Schedule Name
;                        !- Constant Cooling Setpoint {C}

image description

Energyplus: dual thermalstat doest work, system working towards lower temp. all the year round

Hi guys,

I got a hotel model (a FCU+PAU proposed model compared with LEED baseline) with dual thermalstat setpoint (22~24/25 generally) all the year round. Somehow the HVAC energy consumption is way higher than expectation. When I digging out the issue. It is found that some area are working towards the 22 degree C all the year round. For me it seems that the system overcools and then reheat but the setting are quite general that I have struggled for a while but just cannot find how to correct it. The Sensible Heat Gain Summary also shows something weird that 'HVAC Zone Eq & Other Sensible Air Cooling [kWh]' shows considerabily positive heat gain.

I have a attached the schedule setting and also sensinble heat gain summary. Can anybody help to have a look what is going wrong? many thanks!

Allison

Schedule:Compact,
Office Heating SP Sch,   !- Name
Temperature,             !- Schedule Type Limits Name
Through: 31 Dec,         !- Field 1
For: AllDays,            !- Field 2
Until: 06:00,            !- Field 3
-50,                     !- Field 4
Until: 07:00,            !- Field 5
14,                      !- Field 6
Until: 08:00,            !- Field 7
20,                      !- Field 8
Until: 19:00,            !- Field 9
22,                      !- Field 10
Until 20:00,             !- Field 11
20,                      !- Field 12
Until: 21:00,            !- Field 13
14,                      !- Field 14
Until: 24:00,            !- Field 15
-50;                     !- Field 16

Schedule:Compact,
Office Cooling SP Sch,   !- Name
Temperature,             !- Schedule Type Limits Name
Through: 31 Dec,         !- Field 1
For: AllDays,            !- Field 2
Until: 06:00,            !- Field 3
100,                     !- Field 4
Until: 07:00,            !- Field 5
26,                      !- Field 6
Until: 19:00,            !- Field 7
24,                      !- Field 8
Until: 24:00,            !- Field 9
100;                     !- Field 10

HVACTemplate:Thermostat,
Office_thermo,           !- Name
Office Heating SP Sch,   !- Heating Setpoint Schedule Name
,                        !- Constant Heating Setpoint {C}
Office Cooling SP Sch,   !- Cooling Setpoint Schedule Name
;                        !- Constant Cooling Setpoint {C}

image description

Energyplus: dual thermalstat doest work, system working towards lower temp. all the year round

Hi guys,

I got a hotel model (a FCU+PAU proposed model compared with LEED baseline) with dual thermalstat setpoint (22~24/25 generally) all the year round. Somehow the HVAC energy consumption is way higher than expectation. When I digging out the issue. It is found that some area are working towards the 22 degree C all the year round. For me it seems that the system overcools and then reheat but the setting are quite general that I have struggled for a while but just cannot find how to correct it. The Sensible Heat Gain Summary also shows something weird that 'HVAC Zone Eq & Other Sensible Air Cooling [kWh]' shows considerabily positive heat gain.

I have a attached the schedule setting and also sensinble heat gain summary. Can anybody help to have a look what is going wrong? many thanks!

Allison

Schedule:Compact,
Office Heating SP Sch,   !- Name
Temperature,             !- Schedule Type Limits Name
Through: 31 Dec,         !- Field 1
For: AllDays,            !- Field 2
Until: 06:00,            !- Field 3
-50,                     !- Field 4
Until: 07:00,            !- Field 5
14,                      !- Field 6
Until: 08:00,            !- Field 7
20,                      !- Field 8
Until: 19:00,            !- Field 9
22,                      !- Field 10
Until 20:00,             !- Field 11
20,                      !- Field 12
Until: 21:00,            !- Field 13
14,                      !- Field 14
Until: 24:00,            !- Field 15
-50;                     !- Field 16

Schedule:Compact,
Office Cooling SP Sch,   !- Name
Temperature,             !- Schedule Type Limits Name
Through: 31 Dec,         !- Field 1
For: AllDays,            !- Field 2
Until: 06:00,            !- Field 3
100,                     !- Field 4
Until: 07:00,            !- Field 5
26,                      !- Field 6
Until: 19:00,            !- Field 7
24,                      !- Field 8
Until: 24:00,            !- Field 9
100;                     !- Field 10

HVACTemplate:Thermostat,
Office_thermo,           !- Name
Office Heating SP Sch,   !- Heating Setpoint Schedule Name
,                        !- Constant Heating Setpoint {C}
Office Cooling SP Sch,   !- Cooling Setpoint Schedule Name
;                        !- Constant Cooling Setpoint {C}

image description

Energyplus: dual thermalstat doest work, system working towards lower temp. all the year round

Hi guys,

I got a hotel model (a FCU+PAU proposed model compared with LEED baseline) with dual thermalstat setpoint (22~24/25 generally) all the year round. Somehow the HVAC energy consumption is way higher than expectation. When I digging out the issue. It is found that some area are working towards the 22 degree C all the year round. For me it seems that the system overcools and then reheat but the setting are quite general that I have struggled for a while but just cannot find how to correct it. The Sensible Heat Gain Summary also shows something weird that 'HVAC Zone Eq & Other Sensible Air Cooling [kWh]' shows considerabily positive heat gain.

I have a attached the schedule setting and also sensinble heat gain summary. Can anybody help to have a look what is going wrong? many thanks!

Allison

Schedule:Compact,
Office Heating SP Sch,   !- Name
Temperature,             !- Schedule Type Limits Name
Through: 31 Dec,         !- Field 1
For: AllDays,            !- Field 2
Until: 06:00,            !- Field 3
-50,                     !- Field 4
Until: 07:00,            !- Field 5
14,                      !- Field 6
Until: 08:00,            !- Field 7
20,                      !- Field 8
Until: 19:00,            !- Field 9
22,                      !- Field 10
Until 20:00,             !- Field 11
20,                      !- Field 12
Until: 21:00,            !- Field 13
14,                      !- Field 14
Until: 24:00,            !- Field 15
-50;                     !- Field 16

Schedule:Compact,
Office Cooling SP Sch,   !- Name
Temperature,             !- Schedule Type Limits Name
Through: 31 Dec,         !- Field 1
For: AllDays,            !- Field 2
Until: 06:00,            !- Field 3
100,                     !- Field 4
Until: 07:00,            !- Field 5
26,                      !- Field 6
Until: 19:00,            !- Field 7
24,                      !- Field 8
Until: 24:00,            !- Field 9
100;                     !- Field 10

HVACTemplate:Thermostat,
Office_thermo,           !- Name
Office Heating SP Sch,   !- Heating Setpoint Schedule Name
,                        !- Constant Heating Setpoint {C}
Office Cooling SP Sch,   !- Cooling Setpoint Schedule Name
;                        !- Constant Cooling Setpoint {C}

image description