Latent Heat - Iowa Pork Producers Association

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CYA: Prevent Liability Issues With. Your Barns. Dr Mike ... Pig owner – SOP's approved by insurance carrier? ... carefully review their insurance policies with their.
CYA: Prevent Liability Issues With Your Barns

Dr Mike Brumm Brumm Swine Consultancy, Inc. North Mankato, MN 507-995-4709 [email protected] Blog: www.Mnpork.com

Insurance Policies • Pig Owner – Suffocation Insurance or Self Insured

• Contract Grower – ‘Care, Custody and Control’ Policy vs General Farm Liability – ‘CCC’ ~ $0.12-0.20/space/yr?

• Verify exclusions and coverage in policies – Contract grower – proof of SOP adherence? – Pig owner – SOP’s approved by insurance carrier?

– What about clean up/disposal costs?

Iowa Pork Pork Producers Assn • Eldon McAfee, attorney, Beving, Swanson and Forrest, Des Moines • McAfee recommends that contract growers carefully review their insurance policies with their insurance agents and attorney to make sure that there are no other policy exclusions that negate any contract feeding coverage. “Growers should get written assurance from their insurance company that they are covered for pig death losses, particularly losses due to suffocation.”

Emergency Alarm Systems

1. Electric power to pig space 2. Hi/Lo Temp sensor 3. Water pressure

4. Power to controller 5.????

Hi Temp Alarm – set at ?F • Can’t rely on controller hi temp alarm – Power to controller goes out or controller fails but power to site still ok

At least 4x/yr pull ‘main’ and verify curtain drops work Date and sign log form

What would insurance pay at this site?

They don’t work if they aren’t plugged in!

They don’t work if they aren’t connected

May 29, 2012

Wired 220V vs Wired 110V

Minimum drop 1 ft for single wide 2 ft for double-wide

1 4

Emergency Ventilation

Monthly (?) Test and Written History of Test Verify Transfer Switch Works

Emergency Thermostats • Operate ventilation until controller can be repaired – Grow-Finish or Gestation • Stage 2 and Stage 4 ventilation fans

– Wean-Finish, Nursery, Farrowing • Heating • Stage 2 and Stage 4 ventilation fans

Is this your override thermostat?

Emergency Thermostats

Heater Cooling

-5 Furnace minimum +5 device on-temperature

Disaster Strikes !

Dr Jay Harmon, Iowa State U

Types of Heat • Sensible Heat – Measured with thermometer – Dry bulb temperature

• Latent Heat – Heat involved in holding water vapor in air – Dew point temperature ~1044 BTU/lb water vapor

Sensible Plus Latent Heat Production by Growing Pigs Prior to 1988

1988-2002

Brumm estimate of 2012 genetics

1200

1000

Btu/hr

800

600

400

200

0

Trans ASAE 47(1):259-270

22

44

66

88

110

132

Pig Wt, lb

154

176

198

220

Heat production vs Heat loss • Production – 1150 hd @ 800 btu/hr sensible heat

= 920,000 btu/hr

• Loss – 40 x 240 curtain barn – 2735 btu/hr/F – 65F inside temperature

@0F = 177,775 btu/hr @20F = 123,075 btu/hr @40F = 68,375 btu/hr

Cascade of Events • As air temperature rises, ability to lose heat to air decreases - heat loss becomes latent heat

• At failure, air temperature rapidly rises

Heat Loss Mechanisms Sensible

Latent

700 600

btu/hr

500 400

300 200 100

0

30

40

50

60 Air Temperature

70

80

90

Cascade of Events •

At failure, air temperature rapidly rises



As air temperature rises, pigs ability to lose heat to air decreases - heat loss becomes latent heat



Latent heat increases humidity in air



Within 1 hour, 100% RH

– No heat loss possible by latent heat – No heat loss to air at > 90 F air temp • Death is by organ failure due to heat! 112-114F

• Some Pigs Live

Response Times • With big pigs, less than 30 minutes response time • NO PTO Generators • 30-70 lb pigs – up to 1 hr response time

U of Illinois • 15 lb pigs – CO2 within 150 minutes

• 50 lb pigs – 60 minutes for temperature – CO2 within 95 minutes

Pig Age (4 wk wean age) 200 Hd Nursery Rooms 42F outside temp 30C = 86F 35C = 95F 40C = 104F

27

Ventilation Failure

34 F outside with NW wind 200+ lb liveweight 3 cfm/pig minimum + 5 F increase in 5 minutes

Pit Pumping Ventilation www.extension.umn.edu/swine/porkcast/barnventilation.html

National Pork Board www.pork.org

Special Thanks: David Malakowsky Manure Application Specialist Choice Connection

Hydrogen Sulfide Spikes Patni and Clarke, 2003

Pit Pumping Protocols • Agitation – Avoid “rooster-tailing” & splashing

– NO agitation above the surface! – Uncover only one port at a time – Cover port with a tarp – ½ speed for first 2 ft?

Pit Pumping Protocols • Fresh air to all pigs in all pens at all times!

Pit Pumping Protocols

• When the Pumpers Leave –Secure all pit covers –Higher rate for 1-2 hours after

Secure Pit Covers – inlet for fans

2-24” fans 50% minimum speed 7.5 ft2 inlet 4 lids x 2” x 4 ft =2.67 sqft = 36%

A well fed man has many problems A hungry man has one problem Anonymous

CYA: Prevent Liability Issues With Your Barns Dr Mike Brumm Brumm Swine Consultancy, Inc. North Mankato, MN 507-995-4709 [email protected]

Blog: www.Mnpork.com

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